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Wang T, Liu X, Zhang C, He Y, Chan Y, Xie Y, Liang X. Ring artifacts correction for computed tomography image using unsupervised contrastive learning. Phys Med Biol 2023; 68:205008. [PMID: 37714184 DOI: 10.1088/1361-6560/acfa60] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 09/15/2023] [Indexed: 09/17/2023]
Abstract
Objective.Computed tomography (CT) is a widely employed imaging technology for disease detection. However, CT images often suffer from ring artifacts, which may result from hardware defects and other factors. These artifacts compromise image quality and impede diagnosis. To address this challenge, we propose a novel method based on dual contrast learning image style transformation network model (DCLGAN) that effectively eliminates ring artifacts from CT images while preserving texture details.Approach. Our method involves simulating ring artifacts on real CT data to generate the uncorrected CT (uCT) data and transforming them into strip artifacts. Subsequently, the DCLGAN synthetic network is applied in the polar coordinate system to remove the strip artifacts and generate a synthetic CT (sCT). We compare the uCT and sCT images to obtain a residual image, which is then filtered to extract the strip artifacts. An inverse polar transformation is performed to obtain the ring artifacts, which are subtracted from the original CT image to produce a corrected image.Main results.To validate the effectiveness of our approach, we tested it using real CT data, simulated data, and cone beam computed tomography images of the patient's brain. The corrected CT images showed a reduction in mean absolute error by 12.36 Hounsfield units (HU), a decrease in root mean square error by 18.94 HU, an increase in peak signal-to-noise ratio by 3.53 decibels (dB), and an improvement in structural similarity index by 9.24%.Significance.These results demonstrate the efficacy of our method in eliminating ring artifacts and preserving image details, making it a valuable tool for CT imaging.
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Affiliation(s)
- Tangsheng Wang
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Xuan Liu
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, People's Republic of China
| | - Chulong Zhang
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, People's Republic of China
| | - Yutong He
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, People's Republic of China
| | - Yinping Chan
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, People's Republic of China
| | - Yaoqin Xie
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, People's Republic of China
| | - Xiaokun Liang
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, People's Republic of China
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Mahani H, Taheri A, Askari M. Detection performance of pixelated lutetium-yttrium oxyorthosilicate (LYSO) scintillators for high-resolution photon-counting CT imaging. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:023308. [PMID: 36859068 DOI: 10.1063/5.0125952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 02/02/2023] [Indexed: 06/18/2023]
Abstract
High-resolution photon-counting detector (PCD) computed tomography (CT) imaging is increasingly used for several applications. Recent technological advances in CT instrumentation have introduced various types of radiation detectors. Therefore, this work aims at evaluating the lutetium-yttrium oxyorthosilicate (LYSO) scintillator for use in PCD CT from a detector point of view. To do so, a mini-CT prototype was designed and constructed based on the pixelated LYSO blocks. The detector comprises four 10 × 10 linearly arranged LYSO blocks coupled with four position-sensitive photomultiplier tubes. The prototype utilizes a point gamma-ray source along with a cone-beam collimator. An in-home MATLAB-based data processing software package was also developed for storing the list-mode data, event positioning, and energy windowing. A set of experiments were conducted to assess the performance of the constructed energy-resolved LYSO:Ce detector for mini-CT imaging. The results show good crystal identification for all blocks with a maximum peak-to-valley ratio of 3.48. In addition, the findings confirm that the developed detector is position-sensitive. The 20% energy window provides an optimal performance by simultaneously providing good crystal identification and a scatter removal factor of 0.71. A 96% uniformity was also observed when the detector was irradiated with a uniform flood. The spatial resolution of the mini-CT prototype in the x- and y-directions was calculated to be 0.9 and 0.93 mm, respectively, corrected for a magnification factor of 2.5. It is concluded that the pixelated LYSO crystal is a promising alternative to the current detectors and would be the scintillator of choice for high-resolution PCD CT imaging tasks.
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Affiliation(s)
- Hojjat Mahani
- Radiation Applications Research School, Nuclear Science and Technology Research Institute, P.O. Box 14395-836, Tehran, Iran
| | - Ali Taheri
- Radiation Applications Research School, Nuclear Science and Technology Research Institute, P.O. Box 14395-836, Tehran, Iran
| | - Mojtaba Askari
- Radiation Applications Research School, Nuclear Science and Technology Research Institute, P.O. Box 14395-836, Tehran, Iran
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Wang H, Gao Y, Wang L, Yu Y, Zhang J, Liu C, Song Y, Xu H, Wang J, Lou H, Dong T. Lung specific homing of diphenyleneiodonium chloride improves pulmonary fibrosis by inhibiting macrophage M2 metabolic program. J Adv Res 2023; 44:213-225. [PMID: 36725191 PMCID: PMC9936526 DOI: 10.1016/j.jare.2022.04.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 04/20/2022] [Accepted: 04/22/2022] [Indexed: 02/04/2023] Open
Abstract
INTRODUCTION Pulmonary fibrosis (PF) is a fatal disease with a variable and unpredictable course. Effective clinical treatment for PF remains a challenge due to low drug accumulation in lungs and imbalanced polarization of pro/anti-fibrotic macrophages. OBJECTIVES To identify the alteration of immunometabolism in the pulmonary macrophages and investigate the feasibility of specific inhibition of M2 activation of macrophages as an effective anti-PF strategy in vivo. METHODS The high-content screening system was used to select lung-specific homing compounds that can modulate macrophage polarization. Imaging mass spectrometry (IMS) conjugated with chemical proteomics approach was conducted to explore the cells and proteins targeted by diphenyleneiodonium chloride (DPI). A bleomycin-induced fibrotic mouse model was established to examine the in vivo effect of DPI. RESULTS Pulmonary macrophages of PF at late stage exhibited predominantly the M2 phenotype with decreased glycolysis metabolism. DPI was demonstrated to inhibit profibrotic activation of macrophages in the preliminary screening. Notably, IMS conjugated with chemical proteomics approach revealed DPI specifically targeted pulmonary macrophages, leading to the efficient protection from bleomycin-induced pulmonary fibrosis in mice. Mechanistically, DPI upregulated glycolysis and suppressed M2 programming in fibrosis mice, thus resulting in pro-fibrotic cytokine inhibition, hydroxyproline biosynthesis, and collagen deposition, with a concomitant increase in alveolar airspaces. CONCLUSIONS DPI mediated glycolysis in lung and accordingly suppressed M2 programming, resulting in improved lung fibrosis.
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Affiliation(s)
- Huirui Wang
- Department of Natural Product Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Yinghui Gao
- Department of Natural Product Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Li Wang
- Respiratory Medicines, The Affiliated Hospital of Yanan University, Yan'an, Shaanxi, China
| | - Yang Yu
- Advanced Medical Research Institute, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Jiaozhen Zhang
- Department of Natural Product Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Chunyu Liu
- Department of Natural Product Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Yaxin Song
- Department of Natural Product Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Haochuan Xu
- Peking University Health Science Center, Beijing, China
| | - Jingcheng Wang
- Department of Natural Product Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Hongxiang Lou
- Department of Natural Product Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, China.
| | - Ting Dong
- Department of Natural Product Chemistry, Key Laboratory of Chemical Biology (Ministry of Education), School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, China.
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Pochechuev MS, Bilan DS, Fedotov IV, Kelmanson IV, Solotenkov MA, Stepanov EA, Kotova DA, Ivanova AD, Kostyuk AI, Raevskii RI, Lanin AA, Fedotov AB, Belousov VV, Zheltikov AM. Real-time fiber-optic recording of acute-ischemic-stroke signatures. JOURNAL OF BIOPHOTONICS 2022; 15:e202200050. [PMID: 35654757 DOI: 10.1002/jbio.202200050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 04/24/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
We present an experimental framework and methodology for in vivo studies on rat stroke models that enable a real-time fiber-optic recording of stroke-induced hydrogen peroxide and pH transients in ischemia-affected brain areas. Arrays of reconnectable implantable fiber probes combined with advanced optogenetic fluorescent protein sensors are shown to enable a quantitative multisite time-resolved study of oxidative-stress and acidosis buildup dynamics as the key markers, correlates and possible drivers of ischemic stroke. The fiber probes designed for this work provide a wavelength-multiplex forward-propagation channel for a spatially localized, dual-pathway excitation of genetically encoded fluorescence-protein sensors along with a back-propagation channel for the fluorescence return from optically driven fluorescence sensors. We show that the spectral analysis of the fiber-probe-collected fluorescence return provides means for a high-fidelity autofluorescence background subtraction, thus enhancing the sensitivity of real-time detection of stroke-induced transients and significantly reducing measurement uncertainties in in vivo acute-stroke studies as inherently statistical experiments operating with outcomes of multiply repeated measurements on large populations of individually variable animal stroke models.
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Affiliation(s)
| | - Dmitry S Bilan
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Ilya V Fedotov
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas, USA
- Russian Quantum Center, Skolkovo, Moscow, Russia
| | - Ilya V Kelmanson
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Maxim A Solotenkov
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Evgeny A Stepanov
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Daria A Kotova
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Alexandra D Ivanova
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Alexander I Kostyuk
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
| | - Roman I Raevskii
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Aleksandr A Lanin
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Moscow, Russia
| | - Andrei B Fedotov
- Physics Department, M.V. Lomonosov Moscow State University, Moscow, Russia
- Russian Quantum Center, Skolkovo, Moscow, Russia
- National University of Science and Technology "MISiS", Moscow, Russia
| | - Vsevolod V Belousov
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
- Federal Center of Brain Research and Neurotechnologies, Federal Medical Biological Agency, Moscow, Russia
| | - Aleksei M Zheltikov
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas, USA
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Ligand-Specific Nano-Contrast Agents Promote Enhanced Breast Cancer CT Detection at 0.5 mg Au. Int J Mol Sci 2022; 23:ijms23179926. [PMID: 36077324 PMCID: PMC9456125 DOI: 10.3390/ijms23179926] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 08/24/2022] [Accepted: 08/25/2022] [Indexed: 11/16/2022] Open
Abstract
For many cancer types, being undetectable from early symptoms or blood tests, or often detected at late stages, medical imaging emerges as the most efficient tool for cancer screening. MRI, ultrasound, X-rays (mammography), and X-ray CT (CT) are currently used in hospitals with variable costs. Diagnostic materials that can detect breast tumors through molecular recognition and amplify the signal at the targeting site in combination with state-of-the-art CT techniques, such as dual-energy CT, could lead to a more precise detection and assist significantly in image-guided intervention. Herein, we have developed a ligand-specific X-ray contrast agent that recognizes α5β1 integrins overexpressed in MDA-MB-231 breast cancer cells for detection of triple (−) cancer, which proliferates very aggressively. In vitro studies show binding and internalization of our nanoprobes within those cells, towards uncoated nanoparticles (NPs) and saline. In vivo studies show high retention of ~3 nm ligand-PEG-S-AuNPs in breast tumors in mice (up to 21 days) and pronounced CT detection, with statistical significance from saline and iohexol, though only 0.5 mg of metal were utilized. In addition, accumulation of ligand-specific NPs is shown in tumors with minimal presence in other organs, relative to controls. The prolonged, low-metal, NP-enhanced spectral-CT detection of triple (−) breast cancer could lead to breakthrough advances in X-ray cancer diagnostics, nanotechnology, and medicine.
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Zeng S, Sun X, Wan X, Qian C, Yue W, Sohan ASMMF, Lin X, Yin B. A cascade Fermat spiral microfluidic mixer chip for accurate detection and logic discrimination of cancer cells. Analyst 2022; 147:3424-3433. [PMID: 35670058 DOI: 10.1039/d2an00689h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Since cancer has emerged as one of the most serious threats to human health, the highly sensitive determination of cancer cells is of significant importance to improve the accuracy of early clinical diagnosis. In our investigation, a novel cascade Fermat spiral microfluidic mixer chip (CFSMMC) combined with fluorescence sensors as a point-of-care (POC) testing system is successfully fabricated to detect and differentiate cancer cells (MCF-7) from normal cells with excellent sensitivity and selectivity. Here, copper ions (Cu2+) with peroxidase properties can catalyze the oxidation of the non-fluorescent substrate Amplex Red (AR) to the highly fluorescent resorufin (ox-AR) in the presence of hydrogen peroxide (H2O2). Subsequently, thanks to the quenching response of AS1411-AuNPs to ox-AR in the microchannel and the binding of AS1411 to nucleolin on the surface of cancer cells, a CFSMMC-based POC system is established for the highly sensitive detection and identification of human breast cancer cells in a "turn on" manner. The change in fluorescence intensity is linearly related to the concentration of MCF-7, ranging from 102 to 107 cells per mL with a limit of detection (LOD) as low as 17 cells per mL. Interestingly, the cascaded AND logic gate is integrated with CFSMMC for the first time to distinguish cancer cells from normal cells under the control of logic functions, which exhibits great potential in the development of one-step rapid and intelligent detection and logic discrimination.
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Affiliation(s)
- Shiyu Zeng
- School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China.
| | - Xiaocheng Sun
- College of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
| | - Xinhua Wan
- School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China.
| | - Changcheng Qian
- School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China.
| | - Wenkai Yue
- School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China.
| | | | - Xiaodong Lin
- College of Food and Biological Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
| | - Binfeng Yin
- School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China.
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Wanderi K, Cui Z. Organic fluorescent nanoprobes with NIR-IIb characteristics for deep learning. EXPLORATION (BEIJING, CHINA) 2022; 2:20210097. [PMID: 37323884 PMCID: PMC10191020 DOI: 10.1002/exp.20210097] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 01/06/2022] [Indexed: 06/15/2023]
Abstract
Illumination of biological events with near-infrared II sub-channel (NIR-IIb, 1500-1700 nm) enhances the transparency of biological tissues, which is very attractive for deep imaging. Due to the long-wavelength, which reduces optical damage, suppresses autofluorescence, and obviates light scattering, NIR-IIb nanoprobes afford deep tissue penetration with unprecedented spatiotemporal resolution. Hence, NIR-IIb imaging facilitates deep learning and decipherment of biological proceedings in living organisms with astounding high clarity. In comparison to its predecessors in the visible-near-infrared spectrum, imaging in the NIR-IIb has shown great potential for tissue imaging and extrapolating imaging applications for clinical studies. However, the use of organic fluorescent nanoprobes (OFNPs) in the NIR-IIb region is still rare since it is in its early stages. Thus, herein we aim to survey the recent development of different organic fluorescent nanomaterials with NIR-IIb characteristics, their unique photophysical properties, and their utilization in deep imaging in animal models. Further, practical researches on organic fluorescent nanoprobes with NIR-IIb emission and their transition to clinical applications are highlighted.
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Affiliation(s)
- Kevin Wanderi
- State Key Laboratory of VirologyWuhan Institute of VirologyCenter for Biosafety Mega‐ScienceChinese Academy of SciencesWuhanChina
- Department of Analytical Microbiology and NanobiologyUniversity of Chinese Academy of SciencesBeijingChina
| | - Zongqiang Cui
- State Key Laboratory of VirologyWuhan Institute of VirologyCenter for Biosafety Mega‐ScienceChinese Academy of SciencesWuhanChina
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Vogl C, Neef J, Wichmann C. Methods for multiscale structural and functional analysis of the mammalian cochlea. Mol Cell Neurosci 2022; 120:103720. [DOI: 10.1016/j.mcn.2022.103720] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 02/13/2022] [Accepted: 03/08/2022] [Indexed: 01/11/2023] Open
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9
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Hu D, Zhou Z, Wang J, Xiao D, Zhou K, Li P, Li S, Shan L, Wang H, Liu Y, Shen X, Lao C, Luo X, He T, Zhang P, Yan L, Liu J, Ding Y, Cai Z, Li L, Zhang C, Liu Q, Li J, Wang Y, Yang X, Li M, Wu D, Chen M, Zhao J. High-energy high-dose microfocus X-ray computed tomography driven by high-average-current photo-injector. JOURNAL OF X-RAY SCIENCE AND TECHNOLOGY 2022; 30:1-12. [PMID: 34719471 DOI: 10.3233/xst-210960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
High-energy, high-dose, microfocus X-ray computed tomography (HHM CT) is one of the most effective methods for high-resolution X-ray radiography inspection of high-density samples with fine structures. Minimizing the effective focal spot size of the X-ray source can significantly improve the spatial resolution and the quality of the sample images, which is critical and important for the performance of HHM CT. The objective of this study is to present a 9 MeV HHM CT prototype based on a high-average-current photo-injector in which X-rays with about 70μm focal spot size are produced via using tightly focused electron beams with 65/66μm beam size to hit an optimized tungsten target. In digital radiography (DR) experiment using this HHM CT, clear imaging of a standard 0.1 mm lead DR resolution phantom reveals a resolution of 6 lp/mm (line pairs per mm), while a 5 lp/mm resolution is obtained in CT mode using another resolution phantom made of 10 mm ferrum. Moreover, comparing with the common CT systems, a better turbine blade prototype image was obtained with this HHM CT system, which also indicates the promising application potentials of HHM CT in non-destructive inspection or testing for high-density fine-structure samples.
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Affiliation(s)
- Dongcai Hu
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Zheng Zhou
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Jianxin Wang
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Dexin Xiao
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Kui Zhou
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Peng Li
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Shigen Li
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Lijun Shan
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Hanbin Wang
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Yu Liu
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Xuming Shen
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Chenglong Lao
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Xing Luo
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Tianhui He
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Peng Zhang
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Longgang Yan
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Jie Liu
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Yushou Ding
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Zhe Cai
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Lei Li
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Chengxin Zhang
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Qinghua Liu
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Jing Li
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Yuan Wang
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Xingfan Yang
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Ming Li
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Dai Wu
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Menxue Chen
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
| | - Jianheng Zhao
- Institute of Applied Electronics, China Academy of Engineering Physics (CAEP), Mianyang, China
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Timpano CS, Melenka GW. Digital volume correlation analysis of polylactic acid based fused filament fabrication printed composites. JOURNAL OF COMPOSITE MATERIALS 2021; 55:3699-3717. [PMID: 34720176 PMCID: PMC8551441 DOI: 10.1177/00219983211020500] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Fused filament fabrication (FFF) has rapidly begun to see implementation in industrial fields as a method of rapid manufacturing. Traditional FFF parts are made from a single thermoplastic polymer. The polymer is heated to its melting point and deposited on a work bed where a model is gradually built from the base up. While traditional FFF parts have low mechanical properties, a reinforcing phase allows for improved mechanical properties. The addition of a reinforcing material to the base polymer and complex internal microstructure of the 3 D printed party leads to anisotropic mechanical properties. Thus, these materials' mechanical properties become challenging to characterize using traditional measurement techniques due to the previously mentioned factors. Therefore, it is essential to develop a method in which mechanical properties can be measured and analyzed. This study aims to characterize the mechanical behaviour under a uniaxial tensile load of an FFF produced polylactic acid (PLA)-copper particulate composite. The internal response of the FFF sample was imaged using micro-computed tomography at predetermined loads. The μ-CT images were input into an open-source digital volume correlation (DVC) software to measure the internal displacements and strain tensor fields. The study results show the development of different strain fields and interior features of the FFF parts.
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Affiliation(s)
| | - Garrett W Melenka
- Garrett W Melenka, Department of Mechanical Engineering, Lassonde School of Engineering, Toronto, Ontario, Canada.
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Winn CB, Hwang SK, Morin J, Bluette CT, Manickam B, Jiang ZK, Giddabasappa A, Liu CN, Matthews K. Automated monitoring of respiratory rate as a novel humane endpoint: A refinement in mouse metastatic lung cancer models. PLoS One 2021; 16:e0257694. [PMID: 34543354 PMCID: PMC8452061 DOI: 10.1371/journal.pone.0257694] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 09/07/2021] [Indexed: 11/19/2022] Open
Abstract
In oncology research, while xenograft tumor models are easily visualized and humane endpoints can be clearly defined, metastatic tumor models are often based on more subjective clinical observations as endpoints. This study aimed at identifying objective non-invasive criteria for predicting imminent distress and mortality in metastatic lung tumor-bearing mice. BALB/c and C57BL/6 mice were inoculated with CT26 or B16F10 cells, respectively. The mice were housed in Vium smart cages to continuously monitor and stream respiratory rate and locomotion for up to 28 days until scheduled euthanasia or humane endpoint criteria were met. Body weight and body temperature were measured during the study. On days 11, 14, 17 and 28, lungs of subsets of animals were microCT imaged in vivo to assess lung metastasis progression and then euthanized for lung microscopic evaluations. Beginning at day 21, most tumor-bearing animals developed increased respiratory rates followed by decreased locomotion 1-2 days later, compared with the baseline values. Increases in respiratory rate did not correlate to surface tumor nodule counts or lung weight. Body weight measurement did not show significant changes from days 14-28 in either tumor-bearing or control animals. We propose that increases in respiratory rate (1.3-1.5 X) can be used to provide an objective benchmark to signal the need for increased clinical observations or euthanasia. Adoption of this novel humane endpoint criterion would allow investigators time to collect tissue samples prior to spontaneous morbidity or death and significantly reduce the distress of mice in the terminal stages of these metastatic lung tumor models.
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Affiliation(s)
- Caroline B. Winn
- Comparative Medicine, Pfizer Worldwide Research, Development & Medical, Cambridge, Massachusetts, United States of America
| | - Seo-Kyoung Hwang
- Comparative Medicine, Pfizer Worldwide Research, Development & Medical, Groton, Connecticut, United States of America
| | - Jeffrey Morin
- Comparative Medicine, Pfizer Worldwide Research, Development & Medical, Cambridge, Massachusetts, United States of America
| | - Crystal T. Bluette
- Comparative Medicine, Pfizer Worldwide Research, Development & Medical, Cambridge, Massachusetts, United States of America
| | - Balasubramanian Manickam
- Global Pathology and Investigative Toxicology, Pfizer Worldwide Research, Development & Medical, Groton, Connecticut, United States of America
| | - Ziyue K. Jiang
- Comparative Medicine, Pfizer Worldwide Research, Development & Medical, San Diego, California, United States of America
| | - Anand Giddabasappa
- Comparative Medicine, Pfizer Worldwide Research, Development & Medical, San Diego, California, United States of America
| | - Chang-Ning Liu
- Comparative Medicine, Pfizer Worldwide Research, Development & Medical, Groton, Connecticut, United States of America
| | - Kristin Matthews
- Comparative Medicine, Pfizer Worldwide Research, Development & Medical, San Diego, California, United States of America
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12
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Noninvasive Imaging for Assessment of the Efficacy of Therapeutic Agents for Hepatocellular Carcinoma. Mol Imaging Biol 2021; 22:1455-1468. [PMID: 31834570 DOI: 10.1007/s11307-019-01431-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Morphological imaging techniques are typically used in the anti-cancer drug efficacy evaluation process. However, these techniques can evaluate the therapeutic efficacy only when the tumor shows anatomic changes-usually at later stages, when the therapeutic effects are poor. In contrast, molecular imaging allows noninvasive monitoring of tumor growth, assessment of drug metabolism, and evaluation of therapeutic efficacy at the molecular and cellular levels. Multimodality molecular imaging, which combines the advantages of various imaging modalities, provides even more comprehensive therapeutic efficacy assessment in preclinical and clinical studies. This review provides an overview of molecular imaging evaluation of therapeutic efficacy of the anti-tumor drugs in hepatocellular carcinoma (HCC) both in preclinical and clinical research, which holds great promise in guiding HCC treatment into the era of precision medicine.
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13
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Stecker IR, Freeman MS, Sitaraman S, Hall CS, Niedbalski PJ, Hendricks AJ, Martin EP, Weaver TE, Cleveland ZI. Preclinical MRI to Quantify Pulmonary Disease Severity and Trajectories in Poorly Characterized Mouse Models: A Pedagogical Example Using Data from Novel Transgenic Models of Lung Fibrosis. JOURNAL OF MAGNETIC RESONANCE OPEN 2021; 6-7. [PMID: 34414381 PMCID: PMC8372031 DOI: 10.1016/j.jmro.2021.100013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Structural remodeling in lung disease is progressive and heterogeneous, making temporally and spatially explicit information necessary to understand disease initiation and progression. While mouse models are essential to elucidate mechanistic pathways underlying disease, the experimental tools commonly available to quantify lung disease burden are typically invasive (e.g., histology). This necessitates large cross-sectional studies with terminal endpoints, which increases experimental complexity and expense. Alternatively, magnetic resonance imaging (MRI) provides information noninvasively, thus permitting robust, repeated-measures statistics. Although lung MRI is challenging due to low tissue density and rapid apparent transverse relaxation (T2* <1 ms), various imaging methods have been proposed to quantify disease burden. However, there are no widely accepted strategies for preclinical lung MRI. As such, it can be difficult for researchers who lack lung imaging expertise to design experimental protocols-particularly for novel mouse models. Here, we build upon prior work from several research groups to describe a widely applicable acquisition and analysis pipeline that can be implemented without prior preclinical pulmonary MRI experience. Our approach utilizes 3D radial ultrashort echo time (UTE) MRI with retrospective gating and lung segmentation is facilitated with a deep-learning algorithm. This pipeline was deployed to assess disease dynamics over 255 days in novel, transgenic mouse models of lung fibrosis based on disease-associated, loss-of-function mutations in Surfactant Protein-C. Previously identified imaging biomarkers (tidal volume, signal coefficient of variation, etc.) were calculated semi-automatically from these data, with an objectively-defined high signal volume identified as the most robust metric. Beyond quantifying disease dynamics, we discuss common pitfalls encountered in preclinical lung MRI and present systematic approaches to identify and mitigate these challenges. While the experimental results and specific pedagogical examples are confined to lung fibrosis, the tools and approaches presented should be broadly useful to quantify structural lung disease in a wide range of mouse models.
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Affiliation(s)
- Ian R Stecker
- Department of Biomedical Engineering, University of Cincinnati, Cincinnati, OH 45221
- Center for Pulmonary Imaging Research, Division of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229
| | - Matthew S Freeman
- Center for Pulmonary Imaging Research, Division of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229
| | - Sneha Sitaraman
- Division of Neonatology and Pulmonary Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229
| | - Chase S Hall
- Division of Pulmonary and Critical Care, University of Kansas Medical Center, Kansas City, KS 66160
| | - Peter J Niedbalski
- Center for Pulmonary Imaging Research, Division of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229
- Division of Pulmonary and Critical Care, University of Kansas Medical Center, Kansas City, KS 66160
| | - Alexandra J Hendricks
- Department of Biomedical Engineering, University of Cincinnati, Cincinnati, OH 45221
- Center for Pulmonary Imaging Research, Division of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229
| | - Emily P Martin
- Division of Neonatology and Pulmonary Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229
| | - Timothy E Weaver
- Department of Pediatrics, University of Cincinnati, Cincinnati, OH 45221
- Division of Neonatology and Pulmonary Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229
| | - Zackary I Cleveland
- Department of Biomedical Engineering, University of Cincinnati, Cincinnati, OH 45221
- Center for Pulmonary Imaging Research, Division of Pulmonary Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229
- Department of Pediatrics, University of Cincinnati, Cincinnati, OH 45221
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14
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Chen W, Xie L, Yu F, Li Y, Chen C, Xie W, Huang T, Zhang Y, Zhang S, Li P. Zebrafish as a Model for In-Depth Mechanistic Study for Stroke. Transl Stroke Res 2021; 12:695-710. [PMID: 34050491 DOI: 10.1007/s12975-021-00907-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 03/05/2021] [Accepted: 03/08/2021] [Indexed: 12/22/2022]
Abstract
Stroke is one of the world's leading causes of death and disability, posing enormous burden to the society. However, the pathogenesis and mechanisms that underlie brain injury and brain repair remain largely unknown. There's an unmet need of in-depth mechanistic research in this field. Zebrafish (Danio rerio) is a powerful tool in brain science research mainly due to its small size and transparent body, high genome synteny with human, and similar nervous system structures. It can be used to establish both hemorrhagic and ischemic stroke models easily and effectively through different ways. After the establishment of stroke model, research methods including behavioral test, in vivo imaging, and drug screening are available to explore mechanisms that underlie the brain injury and brain repair after stroke. This review focuses on the advantages and the feasibility of zebrafish stroke model, and will also introduce the key methods available for stroke studies in zebrafish, which may drive future mechanistic studies in the pursuit of discovering novel therapeutic targets for stroke patients.
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Affiliation(s)
- Weijie Chen
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiaotong University, 160 Pujian Rd, Shanghai, 200127, China
| | - Lv Xie
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiaotong University, 160 Pujian Rd, Shanghai, 200127, China
| | - Fang Yu
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiaotong University, 160 Pujian Rd, Shanghai, 200127, China
| | - Yan Li
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiaotong University, 160 Pujian Rd, Shanghai, 200127, China
| | - Chen Chen
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiaotong University, 160 Pujian Rd, Shanghai, 200127, China
| | - Wanqing Xie
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiaotong University, 160 Pujian Rd, Shanghai, 200127, China
| | - Tingting Huang
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiaotong University, 160 Pujian Rd, Shanghai, 200127, China
| | - Yueman Zhang
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiaotong University, 160 Pujian Rd, Shanghai, 200127, China
| | - Song Zhang
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiaotong University, 160 Pujian Rd, Shanghai, 200127, China.
| | - Peiying Li
- Department of Anesthesiology, State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, School of Medicine Shanghai Jiaotong University, 160 Pujian Rd, Shanghai, 200127, China.
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15
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Yang S, Li D, Chen L, Zhou X, Fu L, You Y, You Z, Kang L, Li M, He C. Coupling metal organic frameworks with molybdenum disulfide nanoflakes for targeted cancer theranostics. Biomater Sci 2021; 9:3306-3318. [PMID: 33459315 DOI: 10.1039/d0bm02012e] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The superior properties of metal organic frameworks (MOF) can provide great opportunities for merging functional nanoparticles to construct smart and versatile cancer theranostic agents. In this study, on the basis of non-mesoporous nanoparticles (molybdenum disulfide, MoS2), the structure of the MOF shell layer with an adjustable structure can be constructed through the natural coordination interaction between polydopamine (PDA) and iron ion, and the tumor cell target ligand was modified on the surface of the nanocomposite after loading the anticancer drug doxorubicin hydrochloride (DOX) to form a multifunctional cancer theranostics nanoplatform (DOX@MoS2-PMA). Benefiting from the excellent properties of MoS2 and MOF, the favorable photothermal properties and pH/near-infrared (NIR) laser-triggered DOX release behavior of composite nanoparticles were demonstrated. Its well-defined nanostructure, adequate colloidal stability, and satisfactory biocompatibility were further evidenced. Furthermore, the selective tumor cell targeting ability of DOX@MoS2-PMA can improve the cellular uptake efficacy and the photothermal-chemotherapy combination therapy can significantly enhance the killing effect on cancer cells both in vitro and in vivo. In addition, fluorescence imaging results show that nanoparticles can efficiently accumulate inside tumors. The photoacoustic (PA) and magnetic resonance (MR) imaging capabilities derived from different components of nanoparticles can perform better imaging effects. To the best of our knowledge, this is the first attempt to merge the performance of MoS2 with MOF for PA/MR dual-modality imaging-guided photothermal-chemotherapy combination therapy. Our work presented herein proves that MOF can be combined with non-mesoporous nanoparticles and exhibits excellent performance, thus opening a new avenue for endowing non-mesoporous nanoparticles with an efficient drug loading capacity and practical applications of MOFs in nanomedicine.
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Affiliation(s)
- Shuguang Yang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
| | - Dejian Li
- Department of Orthopedics, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, Shanghai 201301, China
| | - Liang Chen
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
| | - Xiaojun Zhou
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
| | - Liwen Fu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
| | - Yanling You
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
| | - Zhengwei You
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
| | - Li Kang
- Department of Interventional and Vascular Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, China.
| | - Maoquan Li
- Department of Interventional and Vascular Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, China.
| | - Chuanglong He
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
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16
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Hayakawa T, Teramoto A, Kiriyama Y, Tsukamoto T, Yamada A, Saito K, Fujita H. Development of Pathological Diagnosis Support System Using Micro-computed Tomography. Acta Histochem Cytochem 2021; 54:49-56. [PMID: 34012176 PMCID: PMC8116619 DOI: 10.1267/ahc.20-00033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 03/03/2021] [Indexed: 11/22/2022] Open
Abstract
In pathological diagnosis, the cutting position of pathological materials is subjectively determined by pathologists. This leads to a low cutting accuracy, which in turn may lead to incorrect diagnoses. In this study, we developed a system that supports the determination of the cutting position by visualizing and analyzing the internal structure of pathological material using micro-computed tomography (CT) before cutting. This system consists of a dedicated micro-CT and cutting support software. The micro-CT system has a fixture for fixing the target, enabling the scanning of easily deformable pathological materials. In the cutting support software, a function that interactively selects the extraction plane while displaying the volume rendering image and outputs a pseudo-histological image was implemented. Our results confirmed that the pseudo-histological image showed the fine structure inside the organ and that the latter image was highly consistent with the pathological image.
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Affiliation(s)
| | | | | | | | - Ayumi Yamada
- Graduate School of Health Sciences, Fujita Health University
| | - Kuniaki Saito
- Graduate School of Health Sciences, Fujita Health University
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17
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Harrison NJ, Shumway KL, Hansen SA, Maitz CA, Thombs LA, Flesner BK. A 3D-printed Apparatus for Imaging Multiple Rats Simultaneously. Comp Med 2021; 71:116-122. [PMID: 33706858 DOI: 10.30802/aalas-cm-20-000089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
CT (computerized tomography) is a necessary imaging modality for cancer staging and disease monitoring. Rodent models of cancer are commonly studied prior to human clinical trials, but CT in rodents can be difficult due to their small size and constant movement, which necessitates general anesthesia. Because microCT equipment is not always available, clinical CT may be a viable alternative. Limitations of microCT and clinical CT include biosecurity, anesthesia to limit image distortion due to motion, and cost. To address several of these constraints, we created a 3D-printed apparatus that accommodated simultaneous imaging of as many as 9 rats under gas anesthesia. Rats were anesthetized in series and placed in a 3 × 3 arrangement. To assess differences in attenuation between individual chambers and rows or columns in the device, we first imaged a standardized phantom plug as a control. We hypothesized that attenuation of specific rat organs would not be affected regardless of the location or position in the 3D-printed device. Four organs-liver, kidney, femur, and brain-were evaluated in 9 rats. For both the phantom and kidneys, statistically significant, but clinically negligible, effects on attenuation were noted between rows but not between columns. We attribute this finding to the absence of a top layer of the apparatus, which thus created asymmetric attenuation and beam hardening through the device. This apparatus allowed us to successfully image 9 rats simultaneously in a clinical CT machine, with negligible effects on attenuation. Planned improvements in this apparatus include completely enclosed versions for biosecure imaging.
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Affiliation(s)
- Nicholas J Harrison
- Veterinary Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia, Missouri
| | - Kate L Shumway
- Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, Missouri
| | - Sarah A Hansen
- Office of Animal Resources, University of Missouri, Columbia, Missouri
| | - Charles A Maitz
- Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, Missouri
| | - Lori A Thombs
- Department of Statistics, College of Arts and Science, University of Missouri, Columbia, Missouri
| | - Brian K Flesner
- Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia, Missouri;,
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18
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Dufour A, Lafont JE, Buffier M, Verset M, Cohendet A, Contamin H, Confais J, Sankar S, Rioult M, Perrier-Groult E, Mallein-Gerin F. Repair of full-thickness articular cartilage defects using IEIK13 self-assembling peptide hydrogel in a non-human primate model. Sci Rep 2021; 11:4560. [PMID: 33633122 PMCID: PMC7907267 DOI: 10.1038/s41598-021-83208-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 01/28/2021] [Indexed: 11/28/2022] Open
Abstract
Articular cartilage is built by chondrocytes which become less active with age. This declining function of the chondrocytes, together with the avascular nature of the cartilage, impedes the spontaneous healing of chondral injuries. These lesions can progress to more serious degenerative articular conditions as in the case of osteoarthritis. As no efficient cure for cartilage lesions exist yet, cartilage tissue engineering has emerged as a promising method aiming at repairing joint defects and restoring articular function. In the present work, we investigated if a new self-assembling peptide (referred as IEIK13), combined with articular chondrocytes treated with a chondrogenic cocktail (BMP-2, insulin and T3, designated BIT) could be efficient to restore full-thickness cartilage defects induced in the femoral condyles of a non-human primate model, the cynomolgus monkey. First, in vitro molecular studies indicated that IEIK13 was efficient to support production of cartilage by monkey articular chondrocytes treated with BIT. In vivo, cartilage implant integration was monitored non-invasively by contrast-enhanced micro-computed tomography, and then by post-mortem histological analysis and immunohistochemical staining of the condyles collected 3 months post-implantation. Our results revealed that the full-thickness cartilage injuries treated with either IEIK13 implants loaded with or devoid of chondrocytes showed similar cartilage-characteristic regeneration. This pilot study demonstrates that IEIK13 can be used as a valuable scaffold to support the in vitro activity of articular chondrocytes and the repair of articular cartilage defects, when implanted alone or with chondrocytes.
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Affiliation(s)
- Alexandre Dufour
- Laboratory of Tissue Biology and Therapeutic Engineering, CNRS UMR 5305, University Claude Bernard-Lyon 1 and University of Lyon, 7 Passage du Vercors, 69367, Lyon Cedex 07, France
| | - Jérôme E Lafont
- Laboratory of Tissue Biology and Therapeutic Engineering, CNRS UMR 5305, University Claude Bernard-Lyon 1 and University of Lyon, 7 Passage du Vercors, 69367, Lyon Cedex 07, France
| | | | | | | | | | | | | | | | - Emeline Perrier-Groult
- Laboratory of Tissue Biology and Therapeutic Engineering, CNRS UMR 5305, University Claude Bernard-Lyon 1 and University of Lyon, 7 Passage du Vercors, 69367, Lyon Cedex 07, France
| | - Frédéric Mallein-Gerin
- Laboratory of Tissue Biology and Therapeutic Engineering, CNRS UMR 5305, University Claude Bernard-Lyon 1 and University of Lyon, 7 Passage du Vercors, 69367, Lyon Cedex 07, France.
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19
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Badea CT. Principles of Micro X-ray Computed Tomography. Mol Imaging 2021. [DOI: 10.1016/b978-0-12-816386-3.00006-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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20
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Cavitation in thermoplastic-reinforced rubber composites upon cyclic testing: Multiscale characterization and modelling. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.123084] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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22
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Ceballos-Francisco D, Carrillo NG, Pardo-Fernández FJ, Cuesta A, Esteban MÁ. Radiological characterization of gilthead seabream (Sparus aurata) by X-ray computed tomography. JOURNAL OF FISH BIOLOGY 2020; 97:1440-1447. [PMID: 32840010 DOI: 10.1111/jfb.14510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 07/21/2020] [Accepted: 08/23/2020] [Indexed: 06/11/2023]
Abstract
In recent years, the increasing use of fish as new animal models in scientific research and the growth of fish farming (mainly for human consumption) have highlighted the need for advanced technology to deepen our knowledge of fish biology. Hence, the present study was carried out to radiologically analyse the whole body of gilthead seabream (Sparus aurata) specimens using X-ray computed tomography (CT). Images were acquired in an Albira SPECT/PET/CT tri-modal preclinical-scanner. Segmentation, measurements and three-dimensional reconstruction were made using the Carestream Molecular imaging Albira CT system in conjunction with Pmod, AMIDE and Amira software packages. The results showed that the density values of gilthead seabream are in the range -700 to +2500 HU for the whole body. We also determined the density ranges that topographically coincide with the swim bladder, soft tissues, fat, skin and skeleton. This work describes, validates and demonstrates the application of a fully automated image analysis technique to study and quantify fish body composition, whether segmented or as a whole. In addition, the basis for applying this image technique in other in vivo studies is established.
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Affiliation(s)
- Diana Ceballos-Francisco
- Fish Innate Immune System Group, Department of Cell Biology and Histology, Faculty of Biology, University of Murcia, Murcia, Spain
| | - Nuria G Carrillo
- Preclinical Imaging Unit, Laboratory Animal Service, Core Facilities University of Murcia, Murcia, Spain
| | | | - Alberto Cuesta
- Fish Innate Immune System Group, Department of Cell Biology and Histology, Faculty of Biology, University of Murcia, Murcia, Spain
| | - María Á Esteban
- Fish Innate Immune System Group, Department of Cell Biology and Histology, Faculty of Biology, University of Murcia, Murcia, Spain
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23
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PM014 attenuates radiation-induced pulmonary fibrosis via regulating NF-kB and TGF-b1/NOX4 pathways. Sci Rep 2020; 10:16112. [PMID: 32999298 PMCID: PMC7527517 DOI: 10.1038/s41598-020-72629-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Accepted: 09/04/2020] [Indexed: 12/31/2022] Open
Abstract
Radiation therapy is the mainstay in the treatment of lung cancer, and lung fibrosis is a radiotherapy-related major side effect that can seriously reduce patient’s quality of life. Nevertheless, effective strategies for protecting against radiation therapy-induced fibrosis have not been developed. Hence, we investigated the radioprotective effects and the underlying mechanism of the standardized herbal extract PM014 on radiation-induced lung fibrosis. Ablative radiation dose of 75 Gy was focally delivered to the left lung of mice. We evaluated the effects of PM014 on radiation-induced lung fibrosis in vivo and in an in vitro model. Lung volume and functional changes were evaluated using the micro-CT and flexiVent system. Fibrosis-related molecules were evaluated by immunohistochemistry, western blot, and real-time PCR. A orthotopic lung tumour mouse model was established using LLC1 cells. Irradiated mice treated with PM014 showed a significant improvement in collagen deposition, normal lung volume, and functional lung parameters, and these therapeutic effects were better than those of amifostine. PM104 attenuated radiation-induced increases in NF-κB activity and inhibited radiation-induced p65 translocation, ROS production, DNA damage, and epithelial-mesenchymal transition. PM104 effectively alleviated fibrosis in an irradiated orthotopic mouse lung tumour model while not attenuating the efficacy of the radiation therapy by reduction of the tumour. Standardized herbal extract PM014 may be a potential therapeutic agent that is able to increase the efficacy of radiotherapy by alleviating radiation-induced lung fibrosis.
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24
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Kappus MR, Wegermann K, Bozdogan E, Patel YA, Janas G, Shropshire E, Parish A, Niedzwiecki D, Muir AJ, Bashir M. Use of Skeletal Muscle Index as a Predictor of Wait-List Mortality in Patients With End-Stage Liver Disease. Liver Transpl 2020; 26:1090-1099. [PMID: 32433802 DOI: 10.1002/lt.25802] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 04/30/2020] [Accepted: 05/02/2020] [Indexed: 12/15/2022]
Abstract
The aim of this study is to validate a proposed definition of sarcopenia in predicting wait-list mortality. We retrospectively evaluated 355 adults (age ≥18 years) with cirrhosis listed for first-time LT from January 1, 2010, to April 1, 2018 from our center. Demographic, laboratory, and outcome data were collected in conjunction with computed tomography scans performed within 3 months of listing. Using imaging analysis software, the skeletal muscle index (SMI), which is a marker for sarcopenia-related mortality, was calculated. A survival analysis was performed to evaluate the association of the proposed sarcopenia definition of SMI <50 cm2 /m2 for men or <39 cm2 /m2 for women with wait-list mortality or delisting. Median SMI was 54.1 cm2 /m2 (range, 47-60 cm2 /m2 ). A total of 61 (17.2%) patients exhibited sarcopenia according to the proposed threshold, and 24.6% (57/232) of men were sarcopenic compared with 3.3% (4/123) of women (P < 0.001). Mean (standard deviation [SD]) SMI was also higher for men (56.6 ± 9.6 cm2 /m2 ) than for women (50.7 ± 8.0 cm2 /m2 ; P < 0.001). Median follow-up time among patients was 2.1 months (0-12 months), and 30 events were observed (hazard ratio, 0.98; 95% confidence interval, 0.95-1.02; P = 0.41). There was no statistically significant difference in time on the waiting list between patients with and without sarcopenia (P = 0.89) as defined at the threshold. Using the prespecified definitions of sarcopenia based on SMI, there was no statistically significant difference in mortality and delisting from the transplant waiting list between patients with and without sarcopenia in this population. Practice and region-specific patterns for pretransplant selection and median Model for End-Stage Liver Disease at transplant may affect SMI as a predictor of wait-list mortality.
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Affiliation(s)
- Matthew R Kappus
- Division of Gastroenterology and Hepatology, Duke University Medical Center, Durham, NC
| | - Kara Wegermann
- Division of Gastroenterology and Hepatology, Duke University Medical Center, Durham, NC
| | - Erol Bozdogan
- Department of Radiology, Duke University, Durham, NC
| | - Yuval A Patel
- Division of Gastroenterology and Hepatology, Duke University Medical Center, Durham, NC
| | - Gemini Janas
- Department of Radiology, Duke University, Durham, NC
| | | | - Alice Parish
- Department of Biostatistics and Bioinformatics, Duke University, Durham, NC
| | - Donna Niedzwiecki
- Department of Biostatistics and Bioinformatics, Duke University, Durham, NC
| | - Andrew J Muir
- Division of Gastroenterology and Hepatology, Duke University Medical Center, Durham, NC.,Duke Clinical Research Institute, Duke University, Durham, NC
| | - Mustafa Bashir
- Division of Gastroenterology and Hepatology, Duke University Medical Center, Durham, NC.,Department of Radiology, Duke University, Durham, NC.,Duke Center for Advanced Magnetic Resonance Development, Duke University, Durham, NC
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25
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Yu Z, Eich C, Cruz LJ. Recent Advances in Rare-Earth-Doped Nanoparticles for NIR-II Imaging and Cancer Theranostics. Front Chem 2020; 8:496. [PMID: 32656181 PMCID: PMC7325968 DOI: 10.3389/fchem.2020.00496] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 05/14/2020] [Indexed: 12/12/2022] Open
Abstract
Fluorescence imaging in the second near infrared window (NIR-II, 1,000-1,700 nm) has been widely used in cancer diagnosis and treatment due to its high spatial resolution and deep tissue penetration depths. In this work, recent advances in rare-earth-doped nanoparticles (RENPs)-a novel kind of NIR-II nanoprobes-are presented. The main focus of this study is on the modification of RENPs and their applications in NIR-II in vitro and in vivo imaging and cancer theranostics. Finally, the perspectives and challenges of NIR-II RENPs are discussed.
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Affiliation(s)
| | | | - Luis J. Cruz
- Translational Nanobiomaterials and Imaging Group, Department of Radiology, Leiden University Medical Center, Leiden, Netherlands
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Bull DJ, Smethurst JA, Sinclair I, Pierron F, Roose T, Powrie W, Bengough AG. Mechanisms of root reinforcement in soils: an experimental methodology using four-dimensional X-ray computed tomography and digital volume correlation. Proc Math Phys Eng Sci 2020; 476:20190838. [PMID: 32523412 PMCID: PMC7277134 DOI: 10.1098/rspa.2019.0838] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 04/21/2020] [Indexed: 11/12/2022] Open
Abstract
Vegetation on railway or highway slopes can improve slope stability through the generation of soil pore water suctions by plant transpiration and mechanical soil reinforcement by the roots. To incorporate the enhanced shearing resistance and stiffness of root-reinforced soils in stability calculations, it is necessary to understand and quantify its effectiveness. This requires integrated and sophisticated experimental and multi-scale modelling approaches to develop an understanding of the processes at different length scales, from individual root-soil interaction through to full soil-profile or slope scale. One of the challenges with multi-scale models is ensuring that they sufficiently closely represent real behaviour. This requires calibration against detailed high-quality and data-rich experiments. This study presents a novel experimental methodology, which combines in situ direct shear loading of a willow root-reinforced soil with X-ray computed tomography to capture the three-dimensional chronology of soil and root deformation within the shear zone. Digital volume correlation (DVC) analysis was applied to the computed tomography dataset to obtain full-field three-dimensional displacement and strain information. This paper demonstrates the feasibility and discusses the challenges associated with DVC experiments on root-reinforced soils.
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Affiliation(s)
- D. J. Bull
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
| | - J. A. Smethurst
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
| | - I. Sinclair
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
| | - F. Pierron
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
| | - T. Roose
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
| | - W. Powrie
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
| | - A. G. Bengough
- School of Science and Engineering, University of Dundee, Dundee, UK
- Department of Ecological Sciences, The James Hutton Institute, Dundee, UK
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O'Rourke JC, Smyth L, Webb AL, Valter K. How Can We Show You, If You Can't See It? Trialing the Use of an Interactive Three-Dimensional Micro-CT Model in Medical Education. ANATOMICAL SCIENCES EDUCATION 2020; 13:206-217. [PMID: 31066239 DOI: 10.1002/ase.1890] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 03/13/2019] [Accepted: 05/01/2019] [Indexed: 05/26/2023]
Abstract
Teaching internal structures obscured from direct view is a major challenge of anatomy education. High-fidelity interactive three-dimensional (3D) micro-computed tomography (CT) models with virtual dissection present a possible solution. However, their utility for teaching complex internal structures of the human body is unclear. The purpose of this study was to investigate the use of a realistic 3D micro-CT interactive visualization computer model to teach paranasal sinus anatomy in a laboratory setting during pre-clinical medical training. Year 1 (n = 79) and Year 2 (n = 59) medical students undertook self-directed activities focused on paranasal sinus anatomy in one of two laboratories (traditional laboratory and 3D model). All participants completed pre and posttests before and after the laboratory session. Results of regression analyses predicting post-laboratory knowledge indicate that, when students were inexperienced with the 3D computer technology, use of the model was detrimental to learning for students with greater prior knowledge of the relevant anatomy (P < 0.05). For participants experienced with the 3D computer technology, however, the use of the model was detrimental for students with less prior knowledge of the relevant anatomy (P < 0.001). These results emphasize that several factors need to be considered in the design and effective implementation of such models in the classroom. Under the right conditions, the 3D model is equal to traditional laboratory resources when used as a learning tool. This paper discusses the importance of preparatory training for students and the technical consideration necessary to successfully integrate such models into medical anatomical curricula.
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Affiliation(s)
- Joseph C O'Rourke
- Medical School, College of Health and Medicine, Australian National University, Canberra, Australian Capital Territory, Australia
| | - Lillian Smyth
- Medical School, College of Health and Medicine, Australian National University, Canberra, Australian Capital Territory, Australia
| | - Alexandra L Webb
- Medical School, College of Health and Medicine, Australian National University, Canberra, Australian Capital Territory, Australia
| | - Krisztina Valter
- Medical School, College of Health and Medicine, Australian National University, Canberra, Australian Capital Territory, Australia
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Wang H, Nie K, Kuang Y. An On-Board Spectral-CT/CBCT/SPECT Imaging Configuration for Small-Animal Radiation Therapy Platform: A Monte Carlo Study. IEEE TRANSACTIONS ON MEDICAL IMAGING 2020; 39:588-600. [PMID: 31380751 DOI: 10.1109/tmi.2019.2932333] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
This study investigated the feasibility of a highly specific multiplexed image-guided small animal radiation therapy (SART) platform based on triple imaging from on-board single-photon emission computed tomography (SPECT), spectral-CT, and cone-beam CT (CBCT) guidance in radiotherapy treatment. As a proof-of-concept, the SART system was built with the capability of triple on-board image guidance by utilizing an x-ray tube and a single cadmium zinc telluride (CZT) semiconductor photon-counting imager via a Monte Carlo simulation study. The x-ray tube can be set at a low tube current for imaging mode and a high tube current for radiation therapy mode, respectively. In the imaging mode, both x-ray and gamma-ray projection data were collected by the imager to reconstruct CBCT, SPECT and spectral CT images of small animals being treated. The modulation transfer function (MTF) of the pixelated CZT imager measured was 8.6 lp/mm. The overall performances of the CBCT and SPECT imaging of the system were evaluated with sufficient spatial resolution and imaging quality to be fitted into the SART platform. The material differentiation and decomposition capacities of spectral CT within the system were verified using K-edge imaging, image-based optimal energy weighted imaging, and image-based linear material decomposition methods. The triple imaging capability of the system was demonstrated using a PMMA phantom containing gadolinium, iodine and radioisotope 99mTc inserts. All the probes were clearly identified in the registered image. The results demonstrated that a novel SART platform with high-quality on-board CBCT, spectral-CT, SPECT image guidance is technically feasible by using a single semiconductor imager, thus affording comprehensive image guidance from anatomical, functional, and molecular levels for radiation treatment beam delivery.
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Aziz A, Medina-Sánchez M, Claussen J, Schmidt OG. Real-Time Optoacoustic Tracking of Single Moving Micro-objects in Deep Phantom and Ex Vivo Tissues. NANO LETTERS 2019; 19:6612-6620. [PMID: 31411038 DOI: 10.1021/acs.nanolett.9b02869] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Medical imaging plays an important role in diagnosis and treatment of multiple diseases. It is a field which seeks for improved sensitivity and spatiotemporal resolution to allow the dynamic monitoring of diverse biological processes that occur at the micro- and nanoscale. Emerging technologies for targeted diagnosis and therapy such as nanotherapeutics, microimplants, catheters, and small medical tools also need to be precisely located and monitored while performing their function inside the human body. In this work, we show for the first time the real-time tracking of moving single micro-objects below centimeter thick phantom tissue and ex vivo chicken breast, using multispectral optoacoustic tomography (MSOT). This technique combines the advantages of ultrasound imaging regarding depth and resolution with the molecular specificity of optical methods, thereby facilitating the discrimination between the spectral signatures of the micro-objects from those of intrinsic tissue molecules. The resulting MSOT signal is further improved in terms of contrast and specificity by coating the micro-objects' surface with gold nanorods, possessing a unique absorption spectrum, which facilitate their discrimination from surrounding biological tissues when translated to future in vivo settings.
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Affiliation(s)
- Azaam Aziz
- Institute for Integrative Nanosciences , Leibniz IFW Dresden , Helmholtzstraße 20 , 01069 Dresden , Germany
| | - Mariana Medina-Sánchez
- Institute for Integrative Nanosciences , Leibniz IFW Dresden , Helmholtzstraße 20 , 01069 Dresden , Germany
| | - Jing Claussen
- iThera Medical GmbH , Zielstattstraße 13 , 81379 Munich , Germany
| | - Oliver G Schmidt
- Institute for Integrative Nanosciences , Leibniz IFW Dresden , Helmholtzstraße 20 , 01069 Dresden , Germany
- Center for Materials, Architectures, and Integration of Nanomembranes (MAIN) , TU Chemnitz , Reichenhainer Straße 10 , 09107 Chemnitz , Germany
- School of Science , TU Dresden , 01062 Dresden , Germany
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Kojonazarov B, Belenkov A, Shinomiya S, Wilchelm J, Kampschulte M, Mizuno S, Ghofrani HA, Grimminger F, Weissmann N, Seeger W, Schermuly RT. Evaluating Systolic and Diastolic Cardiac Function in Rodents Using Microscopic Computed Tomography. Circ Cardiovasc Imaging 2019; 11:e007653. [PMID: 30525986 DOI: 10.1161/circimaging.118.007653] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND The use of microscopic computed tomography to assess the key functional parameters of systolic emptying or diastolic filling in small animals has not been previously reported. The aim of the study was to test whether microscopic computed tomography can assess the dynamics of both left ventricle and right ventricle (RV) diastolic filling and systolic emptying in an experimental model of pulmonary arterial hypertension Methods and Results: The Wistar-Kyoto rats were injected subcutaneously with the VEGF (vascular endothelial growth factor)-receptor inhibitor SU5416 (20 mg/kg body weight) and were then exposed to chronic hypoxia (10% oxygen) for 21 days (SU5416-hypoxia) followed by normoxia for an additional 2 weeks. Thereafter, multiphase cine cardiac images were acquired using a microscopic computed tomography scanner in conjunction with a blood-pool iodinated contrast agent. Examination of the 3-dimensional images of SU5416-hypoxia rats confirmed the presence of severe pulmonary arterial hypertension. Functional parameters that describe the dynamics of ventricular systolic ejection and diastolic filling were calculated. RV peak ejection rate was significantly decreased ( P<0.03) in SU5416-hypoxia rats compared with controls. RV peak filling rate had a significant decrease compared with controls ( P<0.03), particularly in the early phase of diastole ( P<0.03). This was accompanied by increased time to peak filling rate ( P<0.03) and total filling time ( P<0.06). Spearman analysis between microscopic computed tomography RV diastolic indices and invasively derived RV end-diastolic pressure indicated excellent correlation. CONCLUSIONS We developed a method that allows rapid and accurate assessment of cardiac functional indices and that paves the way for more extensive preclinical cardiovascular research.
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Affiliation(s)
- Baktybek Kojonazarov
- German Center for Lung Research (DZL), Justus-Liebig University of Giessen, Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany (B.K., J.W., M.K., H.A.G., F.G., N.W., W.S., R.T.S.)
| | | | | | - Jochen Wilchelm
- German Center for Lung Research (DZL), Justus-Liebig University of Giessen, Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany (B.K., J.W., M.K., H.A.G., F.G., N.W., W.S., R.T.S.)
| | - Marian Kampschulte
- German Center for Lung Research (DZL), Justus-Liebig University of Giessen, Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany (B.K., J.W., M.K., H.A.G., F.G., N.W., W.S., R.T.S.)
| | - Shiro Mizuno
- Kanazawa Medical University, Ishikawa, Japan (S.S., S.M.)
| | - Hossein Ardeschir Ghofrani
- German Center for Lung Research (DZL), Justus-Liebig University of Giessen, Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany (B.K., J.W., M.K., H.A.G., F.G., N.W., W.S., R.T.S.)
| | - Friedrich Grimminger
- German Center for Lung Research (DZL), Justus-Liebig University of Giessen, Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany (B.K., J.W., M.K., H.A.G., F.G., N.W., W.S., R.T.S.)
| | - Norbert Weissmann
- German Center for Lung Research (DZL), Justus-Liebig University of Giessen, Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany (B.K., J.W., M.K., H.A.G., F.G., N.W., W.S., R.T.S.)
| | - Werner Seeger
- German Center for Lung Research (DZL), Justus-Liebig University of Giessen, Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany (B.K., J.W., M.K., H.A.G., F.G., N.W., W.S., R.T.S.).,Max-Planck Institute for Heart and Lung Research, Bad Nauheim, Germany (W.S.)
| | - Ralph Theo Schermuly
- German Center for Lung Research (DZL), Justus-Liebig University of Giessen, Universities of Giessen and Marburg Lung Center (UGMLC), Giessen, Germany (B.K., J.W., M.K., H.A.G., F.G., N.W., W.S., R.T.S.)
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Lohrabian V, Kamali-Asl A, Arabi H, Mamashi F, Hemmati HR, Zaidi H. Design and construction of a variable resolution cone-beam small animal mini-CT prototype for in vivo studies. Radiat Phys Chem Oxf Engl 1993 2019. [DOI: 10.1016/j.radphyschem.2018.10.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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32
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Next-generation imaging of the skeletal system and its blood supply. Nat Rev Rheumatol 2019; 15:533-549. [PMID: 31395974 DOI: 10.1038/s41584-019-0274-y] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/08/2019] [Indexed: 12/16/2022]
Abstract
Bone is organized in a hierarchical 3D architecture. Traditionally, analysis of the skeletal system was based on bone mass assessment by radiographic methods or on the examination of bone structure by 2D histological sections. Advanced imaging technologies and big data analysis now enable the unprecedented examination of bone and provide new insights into its 3D macrostructure and microstructure. These technologies comprise ex vivo and in vivo methods including high-resolution computed tomography (CT), synchrotron-based imaging, X-ray microscopy, ultra-high-field magnetic resonance imaging (MRI), light-sheet fluorescence microscopy, confocal and intravital two-photon imaging. In concert, these techniques have been used to detect and quantify a novel vascular system of trans-cortical vessels in bone. Furthermore, structures such as the lacunar network, which harbours and connects osteocytes, become accessible for 3D imaging and quantification using these methods. Next-generation imaging of the skeletal system and its blood supply are anticipated to contribute to an entirely new understanding of bone tissue composition and function, from macroscale to nanoscale, in health and disease. These insights could provide the basis for early detection and precision-type intervention of bone disorders in the future.
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Smith K, Getzin M, Garfield JJ, Suvarnapathaki S, Camci-Unal G, Wang G, Gkikas M. Nanophosphor-Based Contrast Agents for Spectral X-ray Imaging. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E1092. [PMID: 31366080 PMCID: PMC6723483 DOI: 10.3390/nano9081092] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 07/22/2019] [Accepted: 07/27/2019] [Indexed: 12/26/2022]
Abstract
Lanthanide-based nanophosphors (NPhs) are herein developed as contrast agents for spectral X-ray imaging, highlighting the chemical, macromolecular and structural differences derived from ligand exchange on computed tomography (CT) and solvent dispersibility. Taking advantage of the ability of spectral X-ray imaging with photon-counting detectors to perform image acquisition, analysis, and processing at different energy windows (bins), enhanced signal of our K-edge materials was derived, improving sensitivity of CT imaging, and differentiation between water, tumor-mimic phantoms, and contrast materials. Our results indicate that the most effective of our oleic acid-stabilized K-edge nanoparticles can achieve 2-4x higher contrast than the examined iodinated molecules, making them suitable for deep tissue imaging of tissues or tumors. On the other hand, ligand exchange yielding poly(acrylic acid)-stabilized K-edge nanoparticles allows for high dispersibility and homogeneity in water, but with a lower contrast due to the high density of the polymer grafted, unless further engineering is probed. This is the first well-defined study that manages to correlate NPh grafting density with CT numbers and water dispersibility, laying the groundwork for the development of the next generation CT-guided diagnostic and/or theranostic materials.
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Affiliation(s)
- Kevin Smith
- Department of Chemistry, University of Massachusetts Lowell, Lowell, MA 01854, USA
| | - Matthew Getzin
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | - Josephine J Garfield
- Department of Chemistry, University of Massachusetts Lowell, Lowell, MA 01854, USA
| | - Sanika Suvarnapathaki
- Biomedical Engineering and Biotechnology Program, University of Massachusetts Lowell, Lowell, MA 01854, USA
| | - Gulden Camci-Unal
- Department of Chemical Engineering, University of Massachusetts Lowell, Lowell, MA 01854, USA
| | - Ge Wang
- Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
| | - Manos Gkikas
- Department of Chemistry, University of Massachusetts Lowell, Lowell, MA 01854, USA.
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Improved Peritoneal Cavity and Abdominal Organ Imaging Using a Biphasic Contrast Agent Protocol and Spectral Photon Counting Computed Tomography K-Edge Imaging. Invest Radiol 2019; 53:629-639. [PMID: 29794948 PMCID: PMC6291259 DOI: 10.1097/rli.0000000000000483] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVES To validate in vitro the capability of a high-spatial-resolution prototype spectral photon-counting computed tomography (SPCCT) scanner to differentiate between 2 contrast agents and to assess in vivo the image quality and the feasibility to image the peritoneal cavity in rats using the 2 contrast agents simultaneously within the vascular and peritoneal compartments. MATERIALS AND METHODS The authors performed SPCCT imaging (100 mAs, 120 kVp) with energy bin thresholds set to 30, 51, 64, 72, and 85 keV in vitro on a custom-made polyoxymethylene cylindrical phantom consisting of tubes with dilutions of both contrast agents and in vivo on 2 groups of adult rats using 2 injection protocols. Approval from the institutional animal ethics committee was obtained. One group received macrocylic gadolinium chelate intraperitoneal (IP) and iodine intravenous (IV) injections (protocol A, n = 3), whereas the second group received iodine IP and gadolinium IV (protocol B, n = 3). Helical scans were performed 35 minutes after IP injection and 20 seconds after IV injection. The SPCCT and contrast material images, that is, iodine and gadolinium maps, were reconstructed with a field of view of 160 mm, an isotropic voxel size of 250 μm, and a matrix size of 640 × 640 pixels using a soft reconstruction kernel. The SPCCT images were reconstructed with 2 different spatial resolutions to compare the image quality (sharpness, diagnostic quality, and organ visualization) of SPCCT (250 μm) with single-energy computed tomography (CT) (600 μm). Two radiologists evaluated the peritoneal opacification index in 13 regions (score = 0-3 per region) on each type of image. Concentrations of contrast agents were measured in the organs of interest. RESULTS In vitro, the concentration measurements correlated well with the expected concentrations. The linear regressions both had R values of 0.99, slopes of 0.84 and 0.87, and offsets at -0.52 and -0.38 mg/mL for iodine and gadolinium, respectively. In vivo, the SPCCT images were of better diagnostic quality, with increased sharpness compared with the CT-like images (P < 0.0001). Intraperitoneal diffusion was excellent, with similar peritoneal opacification index on SPCCT images and overlay of contrast material maps (P = 1) without a significant difference between protocol A (37.0 ± 1.7) and protocol B (35.3 ± 1.5) (P = 0.34). Only the contrast material maps demonstrated clear visual separation of the contrast agents, allowing specific quantification of the physiological enhancement in the liver, spleen, and kidney and the urinary clearance in the renal pelvis and bladder. Renal excretion of the contrast agents injected IP was observed and was consistent with blood diffusion. CONCLUSIONS Spectral photon-counting CT can be used to perform a complete peritoneal dual-contrast protocol, enabling a good assessment of the peritoneal cavity and abdominal organs in rats.
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Kim JY, Jeon S, Yoo YJ, Jin H, Won HY, Yoon K, Hwang ES, Lee YJ, Na Y, Cho J, Lee YS. The Hsp27-Mediated IkBα-NFκB Signaling Axis Promotes Radiation-Induced Lung Fibrosis. Clin Cancer Res 2019; 25:5364-5375. [DOI: 10.1158/1078-0432.ccr-18-3900] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 04/12/2019] [Accepted: 05/21/2019] [Indexed: 11/16/2022]
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Three-Dimensional Ultrasound Versus Computerized Tomography in Fat Graft Volumetric Analysis. Ann Plast Surg 2019; 80:293-296. [PMID: 28678028 DOI: 10.1097/sap.0000000000001183] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Studies evaluating fat grafting in mice have frequently used micro-computed tomography (micro-CT) as an accurate radiographic tool to measure longitudinal volume retention without killing the animal. Over the past decade, however, microultrasonography has emerged as an equally powerful preclinical imaging tool. Given their respective strengths in 3-dimensional reconstruction, there is no study to our knowledge that directly compares micro-CT with microultrasound in volumetric analysis. In this study, we compared the performance of micro-CT with microultrasound in the evaluation of adipose tissue graft volume in a murine model. Fifteen immunodeficient mice were given 200 μL of adipose tissue grafts. In vivo volumetric analysis of the grafts by micro-CT and microultrasound was conducted at discrete time points up to postoperative day 105. Three mice were killed at multiple time points, and explanted grafts were reimaged by CT and ultrasound, as mentioned previously. Analysis revealed that in vivo graft volumes measured by micro-CT do not differ significantly from those of microultrasound. Furthermore, both micro-CT and microultrasound were capable of accurately measuring fat grafts as in vivo volumes closely correlated with explanted volumes. Finally, ultrasound was found to yield improved soft tissue contrast compared with micro-CT. Therefore, either modality may be used, depending on experimental needs.
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Li G, Cong W, Michaelson JS, Liu H, Gjesteby L, Wang G. Novel Detection Scheme for X-ray Small-Angle Scattering. IEEE TRANSACTIONS ON RADIATION AND PLASMA MEDICAL SCIENCES 2019; 2:315-325. [PMID: 30854499 DOI: 10.1109/trpms.2018.2839066] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
X-ray imaging techniques, including x-ray radiography and computed tomography, have been in use for decades and proven effective and indispensable in diagnosis and therapy due to their fine resolution and fast acquisition speed. However, the innate disadvantage of x-ray is the poor soft tissue contrast. Small-angle scattering signals were shown to provide unique information about the abnormality of soft tissues that is complementary to the traditional attenuation image. Currently, there is no effective small-angle scattering detection system. In this paper, we propose a new "collimation" design dedicated to capture a small-angle scattering radiographic image directly, which carries critical pathological information for differentiation between normal and abnormal tissues. Our design consists of two interlaced gratings so that both the primary flux and Compton scattering photons are effectively blocked to leave the apertures mainly open to small-angle scattering photons. Theoretical analysis and Monte Carlo simulations demonstrate that small-angle scattering radiography is feasible with our proposed technology.
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Affiliation(s)
- Guang Li
- Biomedical Imaging Center, BME/CBIS, Rensselaer Polytechnic Institute, New York, USA
| | - Wenxiang Cong
- Biomedical Imaging Center, BME/CBIS, Rensselaer Polytechnic Institute, New York, USA
| | | | - Hong Liu
- Center for advanced medical imaging, University of Oklahoma, USA
| | - Lars Gjesteby
- Biomedical Imaging Center, BME/CBIS, Rensselaer Polytechnic Institute, New York, USA
| | - Ge Wang
- Biomedical Imaging Center, BME/CBIS, Rensselaer Polytechnic Institute, New York, USA
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Zolghadr A, Kelley MD, Sokhansefat G, Moradian M, Sullins B, Ley T, Biernacki JJ. Biomass microspheres - A new method for characterization of biomass pyrolysis and shrinkage. BIORESOURCE TECHNOLOGY 2019; 273:16-24. [PMID: 30368158 DOI: 10.1016/j.biortech.2018.09.137] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 09/26/2018] [Accepted: 09/27/2018] [Indexed: 06/08/2023]
Abstract
A method for manufacturing biomass microspheres is introduced. Biomass microspheres between 100 and 400 µm in diameter were produced from crystalline cellulose, switchgrass, and tall fescue using spray drying. The biomass microspheres were characterized using X-ray computed tomography (XCT), thermal gravimetric analysis (TGA), and real-time optical imaging: density, pore structure, and size effects were studied. Dynamic shrinkage was video-captured using a CMOS camera and parallel (paired, side-by-side) weight loss experiments were performed using TGA. The combined data was used to correlate the extent of pyrolysis to gross morphological change (shrinkage). The results show that manufactured biomass microspheres are uniform and that, in the absence of heat and mass transport limitations, pyrolysis shrinkage is an intrinsic property dependent only upon the final processing temperatures.
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Affiliation(s)
- Ali Zolghadr
- Department of Chemical Engineering, Tennessee Technological University, Cookeville, TN 38505, USA
| | - Matthew D Kelley
- Department of Chemical Engineering, Tennessee Technological University, Cookeville, TN 38505, USA
| | - Ghazal Sokhansefat
- Department of Civil and Environmental Engineering, Oklahoma State University, Stillwater, OK, USA
| | - Masoud Moradian
- Department of Civil and Environmental Engineering, Oklahoma State University, Stillwater, OK, USA
| | - Brianna Sullins
- Department of Chemical Engineering, Tennessee Technological University, Cookeville, TN 38505, USA; Department of Civil and Environmental Engineering, Oklahoma State University, Stillwater, OK, USA
| | - Tyler Ley
- Department of Civil and Environmental Engineering, Oklahoma State University, Stillwater, OK, USA
| | - Joseph J Biernacki
- Department of Chemical Engineering, Tennessee Technological University, Cookeville, TN 38505, USA.
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Liao CW, Fuh LJ, Shen YW, Huang HL, Kuo CW, Tsai MT, Hsu JT. Self-assembled micro-computed tomography for dental education. PLoS One 2018; 13:e0209698. [PMID: 30586444 PMCID: PMC6306236 DOI: 10.1371/journal.pone.0209698] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 12/09/2018] [Indexed: 11/24/2022] Open
Abstract
This study used available or purchased equipment and an image reconstruction system developed by the college of dentistry to establish a basic self-assembled micro-computed tomography (micro-CT) system. Such a system would be suitable for teaching dental radiology to dental students. Specifically, it could help students to understand the principles governing dental cone-beam computed tomography (CBCT) and provide graduate students with a system for scanning small samples (e.g., individual teeth) during the early stages of research. The self-assembled micro-CT system was constructed using a portable dental X-ray tube, an intraoral digital X-ray detector, a high-precision rotation stage, related bracket accessories, and a notebook computer. Reconstructed images and three-dimensional models of the maxillary right third molar were produced using the self-assembled micro-CT system and an advanced commercially available micro-CT system (Skyscan 2211). Subsequently, the reconstructed images and 3D models produced using the two systems were compared by two senior dentists to determine whether considerable visual differences could be observed. Finally, the signal-to-noise ratio (SNR) was used for quantitative analysis and to compare the systems. Although the self-assembled micro-CT system produced image boundaries that were not as sharp as those of Skyscan 2211, the images were nonetheless remarkably similar. In addition, the two micro-CT systems produced 3D models that were almost identical in appearance and root canal shape. Quantitative analysis revealed that Skyscan 2211 had produced a SNR that was superior to that of the self-assembled micro-CT system, with the difference ranging from 36.77% to 136.22%; enamel, which has a higher density, exhibited lower SNR differences, whereas dentin, which has a lower density, exhibited higher SNR differences. The self-assembled micro-CT system with a resolution of 36 μm was created using a portable dental X-ray tube and an intraoral digital X-ray detector. Although the scanning time was relatively long (~30 min to scan images of a tooth), the images were adequate in the preliminary stage of experiments. More importantly, students were afforded the opportunity to observe the process of assembling and disassembling each component of a micro-CT scanner and thereby achieve a more comprehensive understanding of the principles governing micro-CT and dental CBCT.
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Affiliation(s)
- Che-Wei Liao
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan, ROC
| | - Lih-Jyh Fuh
- School of Dentistry, College of Dentistry, China Medical University, Taichung, Taiwan, ROC
- Department of Dentistry, China Medical University and Hospital, Taichung, Taiwan, ROC
| | - Yen-Wen Shen
- School of Dentistry, College of Dentistry, China Medical University, Taichung, Taiwan, ROC
- Department of Dentistry, China Medical University and Hospital, Taichung, Taiwan, ROC
| | - Heng-Li Huang
- School of Dentistry, College of Dentistry, China Medical University, Taichung, Taiwan, ROC
- Department of Bioinformatics and Medical Engineering, Asia University, Taichung, Taiwan, ROC
| | - Chih-Wei Kuo
- Materials & Electro-Optics Research Division, National Chung-Shan Institute of Science & Technology, Taoyuan City, Taiwan, ROC
| | - Ming-Tzu Tsai
- Department of Biomedical Engineering Hungkuang University, Taichung, Taiwan, ROC
| | - Jui-Ting Hsu
- School of Dentistry, College of Dentistry, China Medical University, Taichung, Taiwan, ROC
- Department of Bioinformatics and Medical Engineering, Asia University, Taichung, Taiwan, ROC
- * E-mail: ,
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Cengiz IF, Oliveira JM, Reis RL. Micro-CT - a digital 3D microstructural voyage into scaffolds: a systematic review of the reported methods and results. Biomater Res 2018; 22:26. [PMID: 30275969 PMCID: PMC6158835 DOI: 10.1186/s40824-018-0136-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 09/03/2018] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Cell behavior is the key to tissue regeneration. Given the fact that most of the cells used in tissue engineering are anchorage-dependent, their behavior including adhesion, growth, migration, matrix synthesis, and differentiation is related to the design of the scaffolds. Thus, characterization of the scaffolds is highly required. Micro-computed tomography (micro-CT) provides a powerful platform to analyze, visualize, and explore any portion of interest in the scaffold in a 3D fashion without cutting or destroying it with the benefit of almost no sample preparation need. MAIN BODY This review highlights the relationship between the scaffold microstructure and cell behavior, and provides the basics of the micro-CT method. In this work, we also analyzed the original papers that were published in 2016 through a systematic search to address the need for specific improvements in the methods section of the papers including the amount of provided information from the obtained results. CONCLUSION Micro-CT offers a unique microstructural analysis of biomaterials, notwithstanding the associated challenges and limitations. Future studies that will include micro-CT characterization of scaffolds should report the important details of the method, and the derived quantitative and qualitative information can be maximized.
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Affiliation(s)
- Ibrahim Fatih Cengiz
- 3B’s Research Group, I3Bs – Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
- ICVS/3B’s – PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Joaquim Miguel Oliveira
- 3B’s Research Group, I3Bs – Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
- ICVS/3B’s – PT Government Associate Laboratory, Braga/Guimarães, Portugal
- The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
| | - Rui L. Reis
- 3B’s Research Group, I3Bs – Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
- ICVS/3B’s – PT Government Associate Laboratory, Braga/Guimarães, Portugal
- The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, Barco, 4805-017 Guimarães, Portugal
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Mendez C, Colpo N, Duzenli C, Atwal P, Gill B. Technical Note: Development of a phantom for dosimetric comparison of murine micro-CT protocols with optically stimulated luminescent dosimeters. Med Phys 2018; 45:3974-3979. [PMID: 29971794 DOI: 10.1002/mp.13079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 06/04/2018] [Accepted: 06/27/2018] [Indexed: 11/08/2022] Open
Abstract
PURPOSE This work aims to evaluate the utility and accuracy of a mouse-like phantom and optically stimulated luminescent dosimeters (OSLDs) in measuring dose delivered to the body and lung of mice undergoing micro-CT imaging. METHODS A phantom with two cavities for NanoDot OSLDs (Landauer, Inc., Greenwood, IL) was designed and constructed using acrylic to model the mouse body and polyurethane foam to obtain an approximate lung tissue dose. The OSLD dose was compared to ion chamber measurements for the same imaging protocols delivered by a Siemens Inveon micro-CT (Siemens Medical Solutions USA, Inc., Hoffman Estates, IL, USA). A whole body scan, using 80 kV, 0.5 mA and 0.5 mm of aluminum filter, was used to compare results to previously published data. Additionally, dose was measured for the whole body scan without the aluminum filter and two chest protocols (full and half rotation). RESULTS OSLD dose results agree with chamber measurements within 3%. Average OSLD measurements for the whole body scan without filter were 10.7 ± 0.7 cGy in the abdomen and 11.2 ± 0.7 cGy in the lung. For the full rotation chest protocol, the average dose measured in the lung was 65.8 ± 4.3 cGy and 60.2 ± 3.9 cGy in the abdomen. Average doses were 41.1 ± 2.7 cGy in the lung and 38.2 ± 2.5 cGy in the abdomen for the half rotation chest protocol. The OSLD measurements showed a coefficient of variation under 1.4%. A maximum rotational geometry under-response of 0.86% with respect to exposure at normal incidence to the OSLD was measured. CONCLUSIONS The doses measured were found to be comparable to other studies for the scanner configuration and protocols chosen. The phantom built for this study was found to give reproducible dose measurements with 4% uncertainty. In this way, a robust and convenient method is established for future dose assessment of micro-CT protocols and interinstitutional comparisons.
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Affiliation(s)
- Claudia Mendez
- Department of Medical Physics, British Columbia Cancer Agency, 600 West 10th Avenue, Vancouver, British Columbia, V5Z 4E6, Canada
| | - Nadine Colpo
- Molecular Oncology, British Columbia Cancer Research Centre, 675 West 10th Avenue, Vancouver, British Columbia, V5Z 1L3, Canada
| | - Cheryl Duzenli
- Department of Medical Physics, British Columbia Cancer Agency, 600 West 10th Avenue, Vancouver, British Columbia, V5Z 4E6, Canada
- Department of Physics and Astronomy, University of British Columbia, 2329 West Mall, Vancouver, British Columbia, V6T 1Z4, Canada
| | - Parmveer Atwal
- Department of Medical Physics, British Columbia Cancer Agency, 32900 Marshall Road, Abbotsford, British Columbia, V2S 0C2, Canada
| | - Brad Gill
- Department of Medical Physics, British Columbia Cancer Agency, 600 West 10th Avenue, Vancouver, British Columbia, V5Z 4E6, Canada
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Xue Z, Zeng S, Hao J. Non-invasive through-skull brain vascular imaging and small tumor diagnosis based on NIR-II emissive lanthanide nanoprobes beyond 1500 nm. Biomaterials 2018; 171:153-163. [DOI: 10.1016/j.biomaterials.2018.04.037] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 04/09/2018] [Accepted: 04/14/2018] [Indexed: 01/08/2023]
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Meganck JA, Liu B. Dosimetry in Micro-computed Tomography: a Review of the Measurement Methods, Impacts, and Characterization of the Quantum GX Imaging System. Mol Imaging Biol 2018; 19:499-511. [PMID: 27957647 PMCID: PMC5498628 DOI: 10.1007/s11307-016-1026-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Purpose X-ray micro-computed tomography (μCT) is a widely used imaging modality in preclinical research with applications in many areas including orthopedics, pulmonology, oncology, cardiology, and infectious disease. X-rays are a form of ionizing radiation and, therefore, can potentially induce damage and cause detrimental effects. Previous reviews have touched on these effects but have not comprehensively covered the possible implications on study results. Furthermore, interpreting data across these studies is difficult because there is no widely accepted dose characterization methodology for preclinical μCT. The purpose of this paper is to ensure in vivo μCT studies can be properly designed and the data can be appropriately interpreted. Procedures Studies from the scientific literature that investigate the biological effects of radiation doses relevant to μCT were reviewed. The different dose measurement methodologies used in the peer-reviewed literature were also reviewed. The CT dose index 100 (CTDI100) was then measured on the Quantum GX μCT instrument. A low contrast phantom, a hydroxyapatite phantom, and a mouse were also imaged to provide examples of how the dose can affect image quality. Results Data in the scientific literature indicate that scenarios exist where radiation doses used in μCT imaging are high enough to potentially bias experimental results. The significance of this effect may relate to the study outcome and tissue being imaged. CTDI100 is a reasonable metric to use for dose characterization in μCT. Dose rates in the Quantum GX vary based on the amount of material in the beam path and are a function of X-ray tube voltage. The CTDI100 in air for a Quantum GX can be as low as 5.1 mGy for a 50 kVp scan and 9.9 mGy for a 90 kVp scan. This dose is low enough to visualize bone both in a mouse image and in a hydroxyapatite phantom, but applications requiring higher resolution in a mouse or less noise in a low-contrast phantom benefit from longer scan times with increased dose. Conclusions Dose management should be considered when designing μCT studies. Dose rates in the Quantum GX are compatible with longitudinal μCT imaging.
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Affiliation(s)
- Jeffrey A Meganck
- Research and Development, Life Sciences Technology, PerkinElmer, 68 Elm Street, Hopkinton, MA, 01748, USA.
| | - Bob Liu
- Department of Radiology, Massachusetts General Hospital, Boston, MA, USA
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Buckinx F, Landi F, Cesari M, Fielding RA, Visser M, Engelke K, Maggi S, Dennison E, Al-Daghri NM, Allepaerts S, Bauer J, Bautmans I, Brandi ML, Bruyère O, Cederholm T, Cerreta F, Cherubini A, Cooper C, Cruz-Jentoft A, McCloskey E, Dawson-Hughes B, Kaufman JM, Laslop A, Petermans J, Reginster JY, Rizzoli R, Robinson S, Rolland Y, Rueda R, Vellas B, Kanis JA. Pitfalls in the measurement of muscle mass: a need for a reference standard. J Cachexia Sarcopenia Muscle 2018; 9:269-278. [PMID: 29349935 PMCID: PMC5879987 DOI: 10.1002/jcsm.12268] [Citation(s) in RCA: 458] [Impact Index Per Article: 76.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 09/05/2017] [Accepted: 10/12/2017] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND All proposed definitions of sarcopenia include the measurement of muscle mass, but the techniques and threshold values used vary. Indeed, the literature does not establish consensus on the best technique for measuring lean body mass. Thus, the objective measurement of sarcopenia is hampered by limitations intrinsic to assessment tools. The aim of this study was to review the methods to assess muscle mass and to reach consensus on the development of a reference standard. METHODS Literature reviews were performed by members of the European Society for Clinical and Economic Aspects of Osteoporosis and Osteoarthritis working group on frailty and sarcopenia. Face-to-face meetings were organized for the whole group to make amendments and discuss further recommendations. RESULTS A wide range of techniques can be used to assess muscle mass. Cost, availability, and ease of use can determine whether the techniques are better suited to clinical practice or are more useful for research. No one technique subserves all requirements but dual energy X-ray absorptiometry could be considered as a reference standard (but not a gold standard) for measuring muscle lean body mass. CONCLUSIONS Based on the feasibility, accuracy, safety, and low cost, dual energy X-ray absorptiometry can be considered as the reference standard for measuring muscle mass.
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Affiliation(s)
- Fanny Buckinx
- Department of Public Health, Epidemiology and Health Economics, University of Liège, Liège, Belgium
| | - Francesco Landi
- Department of Geriatrics, Neurosciences and Orthopedics, Catholic University of the Sacred Heart Rome, Milan, Italy
| | - Matteo Cesari
- Gérontopôle, University Hospital of Toulouse, Toulouse, France.,INSERM UMR1027, University of Toulouse III Paul Sabatier, Toulouse, France
| | - Roger A Fielding
- Nutrition, Exercise Physiology and Sarcopenia Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA, 02111, USA
| | - Marjolein Visser
- Department of Health Sciences, VU University Amsterdam, Amsterdam, Netherlands.,Department of Nutrition and Dietetics, Internal Medicine, VU University Medical Center, Amsterdam, Netherlands
| | - Klaus Engelke
- Institute of Medical Physics, University of Erlangen, Erlangen, Germany
| | - Stefania Maggi
- National Research Council, Neuroscience Institute, Aging Branch, Padova, Italy
| | - Elaine Dennison
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, England, UK
| | - Nasser M Al-Daghri
- Prince Mutaib Chair for Biomarkers of Osteoporosis, Biochemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | | | - Jurgen Bauer
- Department of Geriatric Medicine, Klinikum, Carl von Ossietzky University, Oldenburg, Germany
| | - Ivan Bautmans
- Gerontology and Frailty in Ageing Research Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Maria Luisa Brandi
- Department of Surgery and Translational Medicine, University of Florence, viale Pieraccini 6, 59139, Florence, Italy
| | - Olivier Bruyère
- Department of Public Health, Epidemiology and Health Economics, University of Liège, Liège, Belgium
| | - Tommy Cederholm
- Human Medicines Research and Development Support Division, Scientific Advice, London, UK
| | - Francesca Cerreta
- Human Medicines Research and Development Support Division, Scientific Advice, London, UK
| | | | - Cyrus Cooper
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, England, UK.,NIHR Musculoskeletal Biomedical Research Unit, University of Oxford, Oxford, UK
| | - Alphonso Cruz-Jentoft
- Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria (Irycis), Madrid, Spain
| | - Eugene McCloskey
- Centre for Metabolic Bone Diseases, University of Sheffield, Sheffield, UK.,MRC and Arthritis Research UK Centre for Integrated research in Musculoskeletal Ageing (CIMA), London, UK
| | - Bess Dawson-Hughes
- Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, MA, USA
| | - Jean-Marc Kaufman
- Department of Endocrinology and Unit for Osteoporosis and Metabolic Bone Diseases, Ghent University Hospital, Ghent, Belgium
| | - Andrea Laslop
- Scientific Office, Austrian Agency for Health and Food Safety, Vienna, Austria
| | | | - Jean-Yves Reginster
- Department of Public Health, Epidemiology and Health Economics, University of Liège, Liège, Belgium
| | - René Rizzoli
- Service of Bone Diseases, Department of Internal Medicine Specialties, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland
| | - Sian Robinson
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, England, UK.,National Institute for Health Research Southampton Biomedical Research Centre, University of Southampton and University Hospital, Southampton NHS Foundation Trust, Southampton, UK
| | - Yves Rolland
- Gérontopôle de Toulouse, Institut du Vieillissement, Centre Hospitalo-Universitaire de Toulouse (CHU Toulouse); UMR INSERM 1027, University of Toulouse III, Toulouse, France
| | | | - Bruno Vellas
- Gérontopôle de Toulouse, Institut du Vieillissement, Centre Hospitalo-Universitaire de Toulouse (CHU Toulouse); UMR INSERM 1027, University of Toulouse III, Toulouse, France
| | - John A Kanis
- Centre for Metabolic Bone Diseases, University of Sheffield, UK and Institute of Health and Ageing, Australian Catholic University, Melbourne, Australia
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Chaurand P, Liu W, Borschneck D, Levard C, Auffan M, Paul E, Collin B, Kieffer I, Lanone S, Rose J, Perrin J. Multi-scale X-ray computed tomography to detect and localize metal-based nanomaterials in lung tissues of in vivo exposed mice. Sci Rep 2018. [PMID: 29535369 PMCID: PMC5849692 DOI: 10.1038/s41598-018-21862-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
In this methodological study, we demonstrated the relevance of 3D imaging performed at various scales for the ex vivo detection and location of cerium oxide nanomaterials (CeO2-NMs) in mouse lung. X-ray micro-computed tomography (micro-CT) with a voxel size from 14 µm to 1 µm (micro-CT) was combined with X-ray nano-computed tomography with a voxel size of 63 nm (nano-CT). An optimized protocol was proposed to facilitate the sample preparation, to minimize the experimental artifacts and to optimize the contrast of soft tissues exposed to metal-based nanomaterials (NMs). 3D imaging of the NMs biodistribution in lung tissues was consolidated by combining a vast variety of techniques in a correlative approach: histological observations, 2D chemical mapping and speciation analysis were performed for an unambiguous detection of NMs. This original methodological approach was developed following a worst-case scenario of exposure, i.e. high dose of exposure with administration via intra-tracheal instillation. Results highlighted both (i) the non-uniform distribution of CeO2-NMs within the entire lung lobe (using large field-of-view micro-CT) and (ii) the detection of CeO2-NMs down to the individual cell scale, e.g. macrophage scale (using nano-CT with a voxel size of 63 nm).
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Affiliation(s)
- Perrine Chaurand
- Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France. .,International Consortium for the Environmental Implications of Nanotechnology iCEINT, CNRS-Duke University, Aix en Provence, France.
| | - Wei Liu
- Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France.,International Consortium for the Environmental Implications of Nanotechnology iCEINT, CNRS-Duke University, Aix en Provence, France
| | - Daniel Borschneck
- Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France.,International Consortium for the Environmental Implications of Nanotechnology iCEINT, CNRS-Duke University, Aix en Provence, France
| | - Clément Levard
- Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France.,International Consortium for the Environmental Implications of Nanotechnology iCEINT, CNRS-Duke University, Aix en Provence, France
| | - Mélanie Auffan
- Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France.,International Consortium for the Environmental Implications of Nanotechnology iCEINT, CNRS-Duke University, Aix en Provence, France
| | - Emmanuel Paul
- INSERM, Equipe 04, U955, Creteil, France.,Univ Paris Est Creteil, IMRB, Fac Med, DHU A TVB, Creteil, France
| | - Blanche Collin
- Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France.,International Consortium for the Environmental Implications of Nanotechnology iCEINT, CNRS-Duke University, Aix en Provence, France
| | - Isabelle Kieffer
- OSUG-FAME, UMS 832 CNRS-Univ. Grenoble Alpes, F-38041, Grenoble, France
| | - Sophie Lanone
- INSERM, Equipe 04, U955, Creteil, France.,Univ Paris Est Creteil, IMRB, Fac Med, DHU A TVB, Creteil, France
| | - Jérôme Rose
- Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France.,International Consortium for the Environmental Implications of Nanotechnology iCEINT, CNRS-Duke University, Aix en Provence, France
| | - Jeanne Perrin
- Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France.,Univ Avignon, Inst Mediterraneen Biodiversite & Ecol Marine & C, Aix Marseille Univ, CNRS, IRD, Marseille, France.,AP HM La Conception, CECOS, Lab Reprod Biol, Dept Gynecol Obstet & Reprod Med, Pole Femmes Parents Enfants, Marseille, France
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Kim JY, An YM, Yoo BR, Kim JM, Han SY, Na Y, Lee YS, Cho J. HSP27 inhibitor attenuates radiation-induced pulmonary inflammation. Sci Rep 2018; 8:4189. [PMID: 29520071 PMCID: PMC5843649 DOI: 10.1038/s41598-018-22635-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 02/27/2018] [Indexed: 01/22/2023] Open
Abstract
Radiation therapy has been used to treat over 70% of thoracic cancer; however, the method usually causes radiation pneumonitis. In the current study, we investigated the radioprotective effects of HSP27 inhibitor (J2) on radiation-induced lung inflammation in comparison to amifostine. In gross and histological findings, J2 treatment significantly inhibited immune cell infiltration in lung tissue, revealing anti-inflammatory potential of J2. Normal lung volume, evaluated by micro-CT analysis, in J2-treated mice was higher compared to that in irradiated mice. J2-treated mice reversed radiation-induced respiratory distress. However, amifostine did not show significant radioprotective effects in comparison to that of J2. In HSP27 transgenic mice, we observed increased immune cells recruitment and decreased volume of normal lung compared to wild type mice. Increased ROS production and oxidative stress after IR were down-regulated by J2 treatment, demonstrating antioxidant property of J2. The entire data of this study collectively showed that J2 may be an effective therapeutic agent for radiation-induced lung injury.
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Affiliation(s)
- Jee-Youn Kim
- Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Yong-Min An
- Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Byeong Rok Yoo
- Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Jin-Mo Kim
- Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Song Yee Han
- Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Younghwa Na
- College of Pharmacy, CHA University, Pocheon, 487-010, Republic of Korea.
| | - Yun-Sil Lee
- College of Pharmacy and Division of Life and Pharmaceutical Science, Ewha Womans University, Seoul, Republic of Korea.
| | - Jaeho Cho
- Department of Radiation Oncology, Yonsei University College of Medicine, Seoul, Republic of Korea.
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Pinar IP, Jones HD. Novel imaging approaches for small animal models of lung disease (2017 Grover Conference series). Pulm Circ 2018; 8:2045894018762242. [PMID: 29480066 PMCID: PMC5888832 DOI: 10.1177/2045894018762242] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Imaging in small animal models of lung disease is challenging, as existing technologies are limited either by resolution or by the terminal nature of the imaging approach. Here, we describe the current state of small animal lung imaging, the technological advances of laboratory-sourced phase contrast X-ray imaging, and the application of this novel technology and its attendant image analysis techniques to the in vivo imaging of the large airways and pulmonary vasculature in murine models of lung health and disease.
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Affiliation(s)
- Isaac P Pinar
- 1 Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC, Australia.,2 Division of Biological Engineering, Faculty of Engineering, Monash University, Melbourne, VIC, Australia
| | - Heather D Jones
- 3 Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, USA
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Gallastegui A, Cheung J, Southard T, Hume KR. Volumetric and linear measurements of lung tumor burden from non-gated micro-CT imaging correlate with histological analysis in a genetically engineered mouse model of non-small cell lung cancer. Lab Anim 2018; 52:457-469. [PMID: 29436921 DOI: 10.1177/0023677218756457] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
In vivo micro-computed tomography (CT) imaging allows longitudinal studies of pulmonary neoplasms in genetically engineered mouse models. Respiratory gating increases the accuracy of lung tumor measurements but lengthens anesthesia time in animals that may be at increased risk for complications. We hypothesized that semiautomated, volumetric, and linear tumor measurements performed in micro-CT images from non-gated scans would have correlation with histological findings. Primary lung tumors were induced in eight FVB mice with two transgenes (FVB/N-Tg(tetO-Kras2)12Hev/J; FVB.Cg-Tg(Scgb1a1-rtTA)1Jaw/J). Non-gated micro-CT scans were performed and the lungs were subsequently harvested. In the acquired micro-CT scans, measurements of all identified tumors were determined using the following methods: semiautomated three-dimensional (3D) volume, ellipsoid volume, Response Evaluation Criteria in Solid Tumors (RECIST; sum of largest axial (i.e., transverse) diameter from five tumors), sum of largest axial diameters from all tumors (modified RECIST), and average axial diameter. For histological analysis, all five lung lobes were analyzed and the tumor area was summed from measurements made on five histological sections that were 300 µm apart from each other (covering a total depth of 1200 µm). All micro-CT measurement methods had very strong correlation with histological tumor burden (Pearson's correlation coefficient, 0.87 ( p = 0.0053) -0.98 ( p < 0.0001)). The only methods found to have different correlations were the semiautomated 3D method and the RECIST method (Williams' test for dependent overlapping correlations, p = 0.013). Our results suggest quantification of lung tumor burden from non-gated micro-CT imaging will reflect histological differences between mice and can therefore be used for between-group comparisons or when concerns about systemic health of research animals may limit lengthy anesthetic procedures.
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Affiliation(s)
- Aitor Gallastegui
- 1 Department of Small Animal Clinical Sciences, University of Florida College of Veterinary Medicine, USA
| | - James Cheung
- 2 Department of Clinical Sciences, Cornell University College of Veterinary Medicine, USA
| | - Teresa Southard
- 3 Department of Biomedical Sciences, Cornell University College of Veterinary Medicine, USA
| | - Kelly R Hume
- 2 Department of Clinical Sciences, Cornell University College of Veterinary Medicine, USA
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Abstract
X-ray micro-computed tomography (μCT) is a technique which can obtain three-dimensional images of a sample, including its internal structure, without the need for destructive sectioning. Here, we review the capability of the technique and examine its potential to provide novel insights into the lifestyles of parasites embedded within host tissue. The current capabilities and limitations of the technology in producing contrast in soft tissues are discussed, as well as the potential solutions for parasitologists looking to apply this technique. We present example images of the mouse whipworm Trichuris muris and discuss the application of μCT to provide unique insights into parasite behaviour and pathology, which are inaccessible to other imaging modalities.
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