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Nadkarni R, Han ZY, Anderson RJ, Allphin AJ, Clark DP, Badea A, Badea CT. High-resolution hybrid micro-CT imaging pipeline for mouse brain region segmentation and volumetric morphometry. PLoS One 2024; 19:e0303288. [PMID: 38781243 PMCID: PMC11115241 DOI: 10.1371/journal.pone.0303288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 04/23/2024] [Indexed: 05/25/2024] Open
Abstract
BACKGROUND Brain region segmentation and morphometry in humanized apolipoprotein E (APOE) mouse models with a human NOS2 background (HN) contribute to Alzheimer's disease (AD) research by demonstrating how various risk factors affect the brain. Photon-counting detector (PCD) micro-CT provides faster scan times than MRI, with superior contrast and spatial resolution to energy-integrating detector (EID) micro-CT. This paper presents a pipeline for mouse brain imaging, segmentation, and morphometry from PCD micro-CT. METHODS We used brains of 26 mice from 3 genotypes (APOE22HN, APOE33HN, APOE44HN). The pipeline included PCD and EID micro-CT scanning, hybrid (PCD and EID) iterative reconstruction, and brain region segmentation using the Small Animal Multivariate Brain Analysis (SAMBA) tool. We applied SAMBA to transfer brain region labels from our new PCD CT atlas to individual PCD brains via diffeomorphic registration. Region-based and voxel-based analyses were used for comparisons by genotype and sex. RESULTS Together, PCD and EID scanning take ~5 hours to produce images with a voxel size of 22 μm, which is faster than MRI protocols for mouse brain morphometry with voxel size above 40 μm. Hybrid iterative reconstruction generates PCD images with minimal artifacts and higher spatial resolution and contrast than EID images. Our PCD atlas is qualitatively and quantitatively similar to the prior MRI atlas and successfully transfers labels to PCD brains in SAMBA. Male and female mice had significant volume differences in 26 regions, including parts of the entorhinal cortex and cingulate cortex. APOE22HN brains were larger than APOE44HN brains in clusters from the hippocampus, a region where atrophy is associated with AD. CONCLUSIONS This work establishes a pipeline for mouse brain analysis using PCD CT, from staining to imaging and labeling brain images. Our results validate the effectiveness of the approach, setting a foundation for research on AD mouse models while reducing scanning durations.
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Affiliation(s)
- Rohan Nadkarni
- Quantitative Imaging and Analysis Lab, Department of Radiology, Duke University Medical Center, Durham, NC, United States of America
| | - Zay Yar Han
- Quantitative Imaging and Analysis Lab, Department of Radiology, Duke University Medical Center, Durham, NC, United States of America
| | - Robert J. Anderson
- Quantitative Imaging and Analysis Lab, Department of Radiology, Duke University Medical Center, Durham, NC, United States of America
| | - Alex J. Allphin
- Quantitative Imaging and Analysis Lab, Department of Radiology, Duke University Medical Center, Durham, NC, United States of America
| | - Darin P. Clark
- Quantitative Imaging and Analysis Lab, Department of Radiology, Duke University Medical Center, Durham, NC, United States of America
| | - Alexandra Badea
- Quantitative Imaging and Analysis Lab, Department of Radiology, Duke University Medical Center, Durham, NC, United States of America
| | - Cristian T. Badea
- Quantitative Imaging and Analysis Lab, Department of Radiology, Duke University Medical Center, Durham, NC, United States of America
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Liu M, Han Y, Xi X, Zhu L, Yang S, Tan S, Chen J, Li L, Yan B. Multiscale Dense U-Net: A Fast Correction Method for Thermal Drift Artifacts in Laboratory NanoCT Scans of Semi-Conductor Chips. ENTROPY (BASEL, SWITZERLAND) 2022; 24:967. [PMID: 35885192 PMCID: PMC9319506 DOI: 10.3390/e24070967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 07/08/2022] [Accepted: 07/10/2022] [Indexed: 12/10/2022]
Abstract
The resolution of 3D structure reconstructed by laboratory nanoCT is often affected by changes in ambient temperature. Although correction methods based on projection alignment have been widely used, they are time-consuming and complex. Especially in piecewise samples (e.g., chips), the existing methods are semi-automatic because the projections lose attenuation information at some rotation angles. Herein, we propose a fast correction method that directly processes the reconstructed slices. Thus, the limitations of the existing methods are addressed. The method is named multiscale dense U-Net (MD-Unet), which is based on MIMO-Unet and achieves state-of-the-art artifacts correction performance in nanoCT. Experiments show that MD-Unet can significantly boost the correction performance (e.g., with three orders of magnitude improvement in correction speed compared with traditional methods), and MD-Unet+ improves 0.92 dB compared with MIMO-Unet in the chip dataset.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Bin Yan
- Henan Key Laboratory of Imaging and Intelligent Processing, PLA Strategic Support Force Information Engineering University, Zhengzhou 450001, China; (M.L.); (Y.H.); (X.X.); (L.Z.); (S.Y.); (S.T.); (J.C.); (L.L.)
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3
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Contrast enhanced X-ray computed tomography imaging of amyloid plaques in Alzheimer disease rat model on lab based micro CT system. Sci Rep 2021; 11:5999. [PMID: 33727592 PMCID: PMC7966753 DOI: 10.1038/s41598-021-84579-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 02/18/2021] [Indexed: 12/21/2022] Open
Abstract
Amyloid plaques are small (~ 50 μm), highly-dense aggregates of amyloid beta (Aβ) protein in brain tissue, supposed to play a key role in pathogenesis of Alzheimer’s disease (AD). Plaques´ in vivo detection, spatial distribution and quantitative characterization could be an essential marker in diagnostics and evaluation of AD progress. However, current imaging methods in clinics possess substantial limits in sensitivity towards Aβ plaques to play a considerable role in AD screening. Contrast enhanced X-ray micro computed tomography (micro CT) is an emerging highly sensitive imaging technique capable of high resolution visualization of rodent brain. In this study we show the absorption based contrast enhanced X-ray micro CT imaging is viable method for detection and 3D analysis of Aβ plaques in transgenic rodent models of Alzheimer’s disease. Using iodine contrasted brain tissue isolated from the Tg-F344-AD rat model we show the micro CT imaging is capable of precise imaging of Aβ plaques, making possible to further analyze various aspects of their 3D spatial distribution and other properties.
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PAULINI FERNANDA, CHAVES SACHAB, RÔLO JOSÉLUIZJ, AZEVEDO RICARDOBDE, LUCCI CAROLINAM. Evaluation of ovarian structures using computerized microtomography. ACTA ACUST UNITED AC 2017; 89:2131-2139. [DOI: 10.1590/0001-3765201720150864] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 06/22/2016] [Indexed: 12/19/2022]
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5
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Chen WC, Chen HY, Liao PC, Wang SJ, Tsai MY, Chen YH, Lin WY. Toward a new insight of calcium oxalate stones in Drosophila by micro-computerized tomography. Urolithiasis 2017; 46:149-155. [DOI: 10.1007/s00240-017-0967-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 02/04/2017] [Indexed: 01/22/2023]
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6
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Shanbhag NC, Henning RH, Schilling L. Long-term survival in permanent middle cerebral artery occlusion: a model of malignant stroke in rats. Sci Rep 2016; 6:28401. [PMID: 27329690 PMCID: PMC4916503 DOI: 10.1038/srep28401] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 06/01/2016] [Indexed: 12/29/2022] Open
Abstract
Occlusion of the middle cerebral artery (MCA) by an intraluminal filament is widely used to study focal brain ischemia in male Sprague-Dawley rats. However, permanent occlusion goes along with a high fatality. To overcome this drawback we designed a new filament carrying a bowling pin-shaped tip (BP-tip) and compared this with three conventionally tipped filaments. Follow-up periods were 24 h (all groups) and 72 and 120 h in BP-tip group. Ischemic damage and swelling were quantified using silver nitrate staining. Collateral flow via the posterior cerebral artery (PCA) was assessed using selective dye perfusion of the internal carotid artery. Despite a comparable decrease of brain perfusion in all groups, ischemic damage was significantly smaller in BP-tips (p < 0.05). Moreover, BP-tip significantly reduced mortality from 60% to 12.5% and widely spared the occipital region and hypothalamus from ischemic damage. Conventional but not BP-tip filaments induced vascular distortion, measured as gross displacement of the MCA origin, which correlated with occipital infarction size. Accordingly, BP-tip occluded rats showed a significantly better collateral filling of the PCA territory. Ischemic volume significantly increased in BP-tip occlusion at 72 h follow-up. BP-tip filaments offer superior survival in permanent MCA occlusion, while mimicking the course of a malignant stroke in patients.
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Affiliation(s)
- Nagesh C Shanbhag
- Division of Neurosurgical Research, Medical Faculty Mannheim, Heidelberg University, Mannheim, D-68167, Germany.,Department of Clinical Pharmacy &Pharmacology, University Medical Center Groningen, University of Groningen, 9700 RB, The Netherlands
| | - Robert H Henning
- Department of Clinical Pharmacy &Pharmacology, University Medical Center Groningen, University of Groningen, 9700 RB, The Netherlands
| | - Lothar Schilling
- Division of Neurosurgical Research, Medical Faculty Mannheim, Heidelberg University, Mannheim, D-68167, Germany
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7
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Qiu X, Shi X, Ouyang J, Xu D, Zhao D. A method to quantify and visualize femoral head intraosseous arteries by micro-CT. J Anat 2016; 229:326-33. [PMID: 27074892 DOI: 10.1111/joa.12475] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/01/2016] [Indexed: 01/08/2023] Open
Abstract
We describe a technique for perfusing a barium sulphate suspension into the intraosseous artery. Following the perfusion of abarium sulphate suspension into 14 fresh lower limbs of Chinese cadavers, micro-CT scanning was applied to digitize, quantify and visualize the intraosseous arteries in the human femoral heads. Then, the femoral heads were removed and subjected to micro-CT scanning. The data were imported into the amira and mimics programs to reconstruct and quantify the intraosseous arteries. The femoral head intraosseous artery lengths, areas, volumes, and femoral head bone volumes were quantified. The artery densities and artery ratios were calculated and analysed with independent-samples t-tests. The intraosseous vasculature volume renderings were displayed as screenshots and videos made with amira. Many intraosseous artery study technologies were compared. The barium sulphate suspension was milky white in colour. The perfusion of the barium sulphate suspension followed by micro-CT scanning provided a good representation of the intraosseous artery. The femoral head intraosseous artery lengths, areas and volumes, and the femoral head bone volumes were displayed as the X¯±S . No differences were observed between the left and right femoral head intraosseous arteries in terms of the artery densities or artery ratios. The volume renderings and 3-D orthogonal projections displayed the overall distributions of the intraosseous arteries. The videos clearly demonstrated the entry sites of the nutrition-carrying arteries, their courses and branches, and the intraosseous arterial anastomoses. Our technique is the simplest and least time-consuming method of producing accurate vascular three-dimensional reconstructions. The perfusion of a barium sulphate suspension into intraosseous arteries combined with micro-CT scanning can deliver high-resolution 3-D digitized data and images of intraosseous arteries. This technique does not require bone decalcification or bone dissection and thus significantly shortens the time required to quantify and display intraosseous arteries. This method provides a simple and rapid technique for quantifying and visualizing human intraosseous arteries.
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Affiliation(s)
- Xing Qiu
- Department of Anatomy, Guangdong Provincial Key Laboratory of Medical Biomechanics, School of Basic Medicine Science, Southern Medical University, Guangzhou, Guangdong, China.,Department of Orthopedics, Affiliated Zhongshan Hospital of Dalian University, Dalian, Liaoning, China
| | - Xiaotian Shi
- Department of Anatomy, Hainan Medical College, Haikou, Hainan, China
| | - Jun Ouyang
- Department of Anatomy, Guangdong Provincial Key Laboratory of Medical Biomechanics, School of Basic Medicine Science, Southern Medical University, Guangzhou, Guangdong, China
| | - Dachuan Xu
- Department of Anatomy, Guangdong Provincial Key Laboratory of Medical Biomechanics, School of Basic Medicine Science, Southern Medical University, Guangzhou, Guangdong, China
| | - Dewei Zhao
- Department of Anatomy, Guangdong Provincial Key Laboratory of Medical Biomechanics, School of Basic Medicine Science, Southern Medical University, Guangzhou, Guangdong, China.,Department of Orthopedics, Affiliated Zhongshan Hospital of Dalian University, Dalian, Liaoning, China
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Walberer M, Rueger MA. The macrosphere model-an embolic stroke model for studying the pathophysiology of focal cerebral ischemia in a translational approach. ANNALS OF TRANSLATIONAL MEDICINE 2015. [PMID: 26207251 DOI: 10.3978/j.issn.2305-5839.2015.04.02] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
The main challenge of stroke research is to translate promising experimental findings from the bench to the bedside. Many suggestions have been made how to achieve this goal, identifying the need for appropriate experimental animal models as one key issue. We here discuss the macrosphere model of focal cerebral ischemia in the rat, which closely resembles the pathophysiology of human stroke both in its acute and chronic phase. Key pathophysiological processes such as brain edema, cortical spreading depolarizations (CSD), neuroinflammation, and stem cell-mediated regeneration are observed in this stroke model, following characteristic temporo-spatial patterns. Non-invasive in vivo imaging allows studying the macrosphere model from the very onset of ischemia up to late remodeling processes in an intraindividual and longitudinal fashion. Such a design of pre-clinical stroke studies provides the basis for a successful translation into the clinic.
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Affiliation(s)
- Maureen Walberer
- 1 Department of Neurology, University Hospital of Cologne, Cologne, Germany ; 2 Max-Planck-Institute for Metabolism Research, Cologne, Germany ; 3 Animal Welfare Office, University of Cologne, Germany
| | - Maria Adele Rueger
- 1 Department of Neurology, University Hospital of Cologne, Cologne, Germany ; 2 Max-Planck-Institute for Metabolism Research, Cologne, Germany ; 3 Animal Welfare Office, University of Cologne, Germany
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9
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Kousik SM, Napier TC, Ross RD, Sumner DR, Carvey PM. Dopamine receptors and the persistent neurovascular dysregulation induced by methamphetamine self-administration in rats. J Pharmacol Exp Ther 2014; 351:432-9. [PMID: 25185214 DOI: 10.1124/jpet.114.217802] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Recently abstinent methamphetamine (Meth) abusers showed neurovascular dysregulation within the striatum. The factors that contribute to this dysregulation and the persistence of these effects are unclear. The current study addressed these knowledge gaps. First, we evaluated the brains of rats with a history of Meth self-administration following various periods of forced abstinence. Micro-computed tomography revealed a marked reduction in vessel diameter and vascular volume uniquely within the striatum between 1 and 28 days after Meth self-administration. Microvessels showed a greater impairment than larger vessels. Subsequently, we determined that dopamine (DA) D2 receptors regulated Meth-induced striatal vasoconstriction via acute noncontingent administration of Meth. These receptors likely regulated the response to striatal hypoxia, as hypoxia inducible factor 1α was elevated. Acute Meth exposure also increased striatal levels of endothelin receptor A and decreased neuronal nitric oxide synthase. Collectively, the data provide novel evidence that Meth-induced striatal neurovascular dysregulation involves DA receptor signaling that results in vasoconstriction via endothelin receptor A and nitric oxide signaling. As these effects can lead to hypoxia and trigger neuronal damage, these findings provide a mechanistic explanation for the selective striatal toxicity observed in the brains of Meth-abusing humans.
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Affiliation(s)
- Sharanya M Kousik
- Center for Compulsive Behavior and Addiction (S.M.K., T.C.N., P.M.C.), Department of Pharmacology (S.M.K., T.C.N., P.M.C.), Department of Psychiatry (T.C.N.), Department of Neurologic Sciences (P.M.C.), and Department of Anatomy and Cell Biology (R.D.R., D.R.S.), Rush University Medical Center, Chicago, Illinois
| | - T Celeste Napier
- Center for Compulsive Behavior and Addiction (S.M.K., T.C.N., P.M.C.), Department of Pharmacology (S.M.K., T.C.N., P.M.C.), Department of Psychiatry (T.C.N.), Department of Neurologic Sciences (P.M.C.), and Department of Anatomy and Cell Biology (R.D.R., D.R.S.), Rush University Medical Center, Chicago, Illinois
| | - Ryan D Ross
- Center for Compulsive Behavior and Addiction (S.M.K., T.C.N., P.M.C.), Department of Pharmacology (S.M.K., T.C.N., P.M.C.), Department of Psychiatry (T.C.N.), Department of Neurologic Sciences (P.M.C.), and Department of Anatomy and Cell Biology (R.D.R., D.R.S.), Rush University Medical Center, Chicago, Illinois
| | - D Rick Sumner
- Center for Compulsive Behavior and Addiction (S.M.K., T.C.N., P.M.C.), Department of Pharmacology (S.M.K., T.C.N., P.M.C.), Department of Psychiatry (T.C.N.), Department of Neurologic Sciences (P.M.C.), and Department of Anatomy and Cell Biology (R.D.R., D.R.S.), Rush University Medical Center, Chicago, Illinois
| | - Paul M Carvey
- Center for Compulsive Behavior and Addiction (S.M.K., T.C.N., P.M.C.), Department of Pharmacology (S.M.K., T.C.N., P.M.C.), Department of Psychiatry (T.C.N.), Department of Neurologic Sciences (P.M.C.), and Department of Anatomy and Cell Biology (R.D.R., D.R.S.), Rush University Medical Center, Chicago, Illinois
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10
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Present status and future challenges of electroencephalography- and magnetic resonance imaging-based monitoring in preclinical models of focal cerebral ischemia. Brain Res Bull 2014; 102:22-36. [PMID: 24462642 DOI: 10.1016/j.brainresbull.2014.01.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Revised: 01/07/2014] [Accepted: 01/14/2014] [Indexed: 12/16/2022]
Abstract
Animal models are useful tools for better understanding the mechanisms underlying neurological deterioration after an ischemic insult as well as subsequent evolution of changes and recovery of functions. In response to the updated requirements for preclinical investigations of stroke to include relevant functional measurement techniques and biomarker endpoints, we here review the state of knowledge on application of some translational electrophysiological and neuroimaging methods, and in particular, electroencephalography monitoring and magnetic resonance imaging in rodent models of ischemic stroke. This may lead to improvement of diagnostic methods and identification of new therapeutic targets, which would considerably advance the translational value of preclinical stroke research.
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11
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Wathen CA, Foje N, van Avermaete T, Miramontes B, Chapaman SE, Sasser TA, Kannan R, Gerstler S, Leevy WM. In vivo X-ray computed tomographic imaging of soft tissue with native, intravenous, or oral contrast. SENSORS (BASEL, SWITZERLAND) 2013; 13:6957-80. [PMID: 23711461 PMCID: PMC3715264 DOI: 10.3390/s130606957] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Revised: 05/16/2013] [Accepted: 05/23/2013] [Indexed: 02/07/2023]
Abstract
X-ray Computed Tomography (CT) is one of the most commonly utilized anatomical imaging modalities for both research and clinical purposes. CT combines high-resolution, three-dimensional data with relatively fast acquisition to provide a solid platform for non-invasive human or specimen imaging. The primary limitation of CT is its inability to distinguish many soft tissues based on native contrast. While bone has high contrast within a CT image due to its material density from calcium phosphate, soft tissue is less dense and many are homogenous in density. This presents a challenge in distinguishing one type of soft tissue from another. A couple exceptions include the lungs as well as fat, both of which have unique densities owing to the presence of air or bulk hydrocarbons, respectively. In order to facilitate X-ray CT imaging of other structures, a range of contrast agents have been developed to selectively identify and visualize the anatomical properties of individual tissues. Most agents incorporate atoms like iodine, gold, or barium because of their ability to absorb X-rays, and thus impart contrast to a given organ system. Here we review the strategies available to visualize lung, fat, brain, kidney, liver, spleen, vasculature, gastrointestinal tract, and liver tissues of living mice using either innate contrast, or commercial injectable or ingestible agents with selective perfusion. Further, we demonstrate how each of these approaches will facilitate the non-invasive, longitudinal, in vivo imaging of pre-clinical disease models at each anatomical site.
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Affiliation(s)
- Connor A. Wathen
- Department of Biological Sciences, 100 Galvin Life Sciences Center, University of Notre Dame, Notre Dame, IN 46556, USA; E-Mail:
| | - Nathan Foje
- Department of Chemistry and Biochemistry, 236 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556, USA; E-Mails: (N.F.); (T.V.A.); (B.M.); (T.A.S.)
| | - Tony van Avermaete
- Department of Chemistry and Biochemistry, 236 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556, USA; E-Mails: (N.F.); (T.V.A.); (B.M.); (T.A.S.)
- Penn High School, 55900 Bittersweet Road, Mishawaka, IN 46545, USA
| | - Bernadette Miramontes
- Department of Chemistry and Biochemistry, 236 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556, USA; E-Mails: (N.F.); (T.V.A.); (B.M.); (T.A.S.)
- Penn High School, 55900 Bittersweet Road, Mishawaka, IN 46545, USA
| | - Sarah E. Chapaman
- Notre Dame Integrated Imaging Facility, Notre Dame, IN 46556, USA; E-Mail:
| | - Todd A. Sasser
- Department of Chemistry and Biochemistry, 236 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556, USA; E-Mails: (N.F.); (T.V.A.); (B.M.); (T.A.S.)
- Bruker-Biospin Corporation, 4 Research Drive, Woodbridge, CT 06525, USA
| | - Raghuraman Kannan
- Department of Radiology, University of Missouri, Columbia, MO 65212, USA; E-Mail:
| | - Steven Gerstler
- Saint Joseph Regional Medical Center, Mishawaka, IN 46545, USA; E-Mail:
| | - W. Matthew Leevy
- Department of Biological Sciences, 100 Galvin Life Sciences Center, University of Notre Dame, Notre Dame, IN 46556, USA; E-Mail:
- Notre Dame Integrated Imaging Facility, Notre Dame, IN 46556, USA; E-Mail:
- Harper Cancer Research Institute, A200 Harper Hall, Notre Dame, IN 46530, USA
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12
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Hayasaka N, Nagai N, Kawao N, Niwa A, Yoshioka Y, Mori Y, Shigeta H, Kashiwagi N, Miyazawa M, Satou T, Higashino H, Matsuo O, Murakami T. In vivo diagnostic imaging using micro-CT: sequential and comparative evaluation of rodent models for hepatic/brain ischemia and stroke. PLoS One 2012; 7:e32342. [PMID: 22384223 PMCID: PMC3285673 DOI: 10.1371/journal.pone.0032342] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Accepted: 01/26/2012] [Indexed: 01/08/2023] Open
Abstract
Background There is an increasing need for animal disease models for pathophysiological research and efficient drug screening. However, one of the technical barriers to the effective use of the models is the difficulty of non-invasive and sequential monitoring of the same animals. Micro-CT is a powerful tool for serial diagnostic imaging of animal models. However, soft tissue contrast resolution, particularly in the brain, is insufficient for detailed analysis, unlike the current applications of CT in the clinical arena. We address the soft tissue contrast resolution issue in this report. Methodology We performed contrast-enhanced CT (CECT) on mouse models of experimental cerebral infarction and hepatic ischemia. Pathological changes in each lesion were quantified for two weeks by measuring the lesion volume or the ratio of high attenuation area (%HAA), indicative of increased vascular permeability. We also compared brain images of stroke rats and ischemic mice acquired with micro-CT to those acquired with 11.7-T micro-MRI. Histopathological analysis was performed to confirm the diagnosis by CECT. Principal Findings In the models of cerebral infarction, vascular permeability was increased from three days through one week after surgical initiation, which was also confirmed by Evans blue dye leakage. Measurement of volume and %HAA of the liver lesions demonstrated differences in the recovery process between mice with distinct genetic backgrounds. Comparison of CT and MR images acquired from the same stroke rats or ischemic mice indicated that accuracy of volumetric measurement, as well as spatial and contrast resolutions of CT images, was comparable to that obtained with MRI. The imaging results were also consistent with the histological data. Conclusions This study demonstrates that the CECT scanning method is useful in rodents for both quantitative and qualitative evaluations of pathologic lesions in tissues/organs including the brain, and is also suitable for longitudinal observation of the same animals.
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Affiliation(s)
- Naoto Hayasaka
- Department of Anatomy and Neurobiology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan
- PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama, Japan
- * E-mail: (NH); (TM)
| | - Nobuo Nagai
- Department of Physiology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan
| | - Naoyuki Kawao
- Department of Physiology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan
| | - Atsuko Niwa
- Department of Pharmacology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan
| | - Yoshichika Yoshioka
- Biofunctional Imaging Laboratory, Immunology Frontier Research Center, Osaka University, Suita, Osaka, Japan
| | - Yuki Mori
- Biofunctional Imaging Laboratory, Immunology Frontier Research Center, Osaka University, Suita, Osaka, Japan
| | | | - Nobuo Kashiwagi
- Department of Radiology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan
| | - Masaaki Miyazawa
- Department of Immunology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan
| | - Takao Satou
- Department of Pathology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan
| | - Hideaki Higashino
- Department of Pharmacology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan
| | - Osamu Matsuo
- Department of Physiology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan
| | - Takamichi Murakami
- Department of Radiology, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan
- * E-mail: (NH); (TM)
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