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Wu L, Carchi C, Michaeli S, Mangia S, Idiyatullin D. Alternating Look-Locker for quantitative T 1 , T 1ρ and B 1 3D MRI mapping. Magn Reson Med 2024; 91:149-161. [PMID: 37582198 PMCID: PMC10651079 DOI: 10.1002/mrm.29839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 08/01/2023] [Accepted: 08/02/2023] [Indexed: 08/17/2023]
Abstract
PURPOSE To develop a new MRI method, entitled alternating Look-Locker (aLL), for quantitativeT 1 $$ {T}_1 $$ ,T 1 ρ $$ {T}_{1\uprho} $$ , andB 1 $$ {B}_1 $$ 3D mapping. METHODS A Look-Locker scheme that alternates magnetization from +Z and -Z axes of the laboratory frame is utilized in combination with a 3D Multi-Band Sweep Imaging with Fourier Transformation (MB-SWIFT) readout. The analytical solution describing the spin evolution during aLL, as well as the correction required for segmented acquisition were derived. The simultaneousB 1 $$ {B}_1 $$ andT 1 $$ {T}_1 $$ mapping are demonstrated on an agar/saline phantom and on an in-vivo rat head.T 1 ρ $$ {T}_{1\uprho} $$ relaxation was achieved by cyclically applying magnetization preparation (MP) modules consisting of two adiabatic pulses.T 1 ρ $$ {T}_{1\uprho} $$ values in the rat brain in-vivo and in a gadobenate dimeglumine (Gd-DTPA) phantom were compared to those obtained with a previously introduced steady-state (SS) method. RESULTS The accuracy and precision of the analytical solution was tested by Bloch simulations. With the application of MP modules, the aLL method provides simultaneousT 1 $$ {T}_1 $$ andT 1 ρ $$ {T}_{1\uprho} $$ maps. Conversely, without it, the method can be used for simultaneousT 1 $$ {T}_1 $$ andB 1 $$ {B}_1 $$ mapping.T 1 ρ $$ {T}_{1\uprho} $$ values were similar with both aLL and SS techniques. However, the aLL method resulted in more robust quantitative mapping compared to the SS method. Unlike the SS method, the aLL method does not require additional scans for generatingT 1 $$ {T}_1 $$ maps. CONCLUSION The proposed method offers a new flexible tool for quantitative mapping ofT 1 $$ {T}_1 $$ ,T 1 ρ $$ {T}_{1\uprho} $$ , andB 1 $$ {B}_1 $$ . The aLL method can also be used with readout schemes different from MB-SWIFT.
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Affiliation(s)
- Lin Wu
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Chris Carchi
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Shalom Michaeli
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Silvia Mangia
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Djaudat Idiyatullin
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
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Surowiec RK, Ram S, Idiyatullin D, Goulet R, Schlecht SH, Galban CJ, Kozloff KM. In vivo quantitative imaging biomarkers of bone quality and mineral density using multi-band-SWIFT magnetic resonance imaging. Bone 2021; 143:115615. [PMID: 32853850 PMCID: PMC7770067 DOI: 10.1016/j.bone.2020.115615] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 08/19/2020] [Accepted: 08/21/2020] [Indexed: 12/29/2022]
Abstract
Bone is a composite biomaterial of mineral crystals, organic matrix, and water. Each contributes to bone quality and strength and may change independently, or together, with disease progression and treatment. Even so, there is a near ubiquitous reliance on ionizing x-ray-based approaches to measure bone mineral density (BMD) which is unable to fully characterize bone strength and may not adequately predict fracture risk. Characterization of treatment efficacy in bone diseases of altered remodeling is complicated by the lack of imaging modality able to safely monitor material-level and biochemical changes in vivo. To improve upon the current state of bone imaging, we tested the efficacy of Multi Band SWeep Imaging with Fourier Transformation (MB-SWIFT) magnetic resonance imaging (MRI) as a readout of bone derangement in an estrogen deficient ovariectomized (OVX) rat model during growth. MB-SWIFT MRI-derived BMD correlated significantly with BMD measured using micro-computed tomography (μCT). In this rodent model, growth appeared to overcome estrogen deficiency as bone mass continued to increase longitudinally over the duration of the study. Nonetheless, after 10 weeks of intervention, MB-SWIFT detected significant changes consistent with estrogen deficiency in cortical water, cortical matrix organization (T1), and marrow fat. Findings point to MB-SWIFT's ability to quantify BMD in good agreement with μCT while providing additive quantitative outcomes about bone quality in a manner consistent with estrogen deficiency. These results indicate MB-SWIFT as a non-ionizing imaging strategy with value for bone imaging and may be a promising technique to progress to the clinic for monitoring and clinical management of patients with bone diseases such as osteoporosis.
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Affiliation(s)
- Rachel K Surowiec
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA; Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Sundaresh Ram
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA; Department of Radiology, University of Michigan, Ann Arbor, MI, USA
| | - Djaudat Idiyatullin
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, MN, USA
| | - Robert Goulet
- Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Stephen H Schlecht
- Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Craig J Galban
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA; Department of Radiology, University of Michigan, Ann Arbor, MI, USA
| | - Kenneth M Kozloff
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA; Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, MI, USA.
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McGuire JJ, Frieling JS, Lo CH, Li T, Muhammad A, Lawrence HR, Lawrence NJ, Cook LM, Lynch CC. Mesenchymal stem cell-derived interleukin-28 drives the selection of apoptosis resistant bone metastatic prostate cancer. Nat Commun 2021; 12:723. [PMID: 33526787 PMCID: PMC7851397 DOI: 10.1038/s41467-021-20962-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Accepted: 01/06/2021] [Indexed: 01/12/2023] Open
Abstract
Bone metastatic prostate cancer (PCa) promotes mesenchymal stem cell (MSC) recruitment and their differentiation into osteoblasts. However, the effects of bone-marrow derived MSCs on PCa cells are less explored. Here, we report MSC-derived interleukin-28 (IL-28) triggers prostate cancer cell apoptosis via IL-28 receptor alpha (IL-28Rα)-STAT1 signaling. However, chronic exposure to MSCs drives the selection of prostate cancer cells that are resistant to IL-28-induced apoptosis and therapeutics such as docetaxel. Further, MSC-selected/IL-28-resistant prostate cancer cells grow at accelerated rates in bone. Acquired resistance to apoptosis is PCa cell intrinsic, and is associated with a shift in IL-28Rα signaling via STAT1 to STAT3. Notably, STAT3 ablation or inhibition impairs MSC-selected prostate cancer cell growth and survival. Thus, bone marrow MSCs drive the emergence of therapy-resistant bone metastatic prostate cancer yet this can be disabled by targeting STAT3.
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Affiliation(s)
- Jeremy J McGuire
- Cancer Biology Ph.D. Program, University of South Florida, Tampa, FL, USA
- Tumor Biology Department, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Jeremy S Frieling
- Tumor Biology Department, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Chen Hao Lo
- Cancer Biology Ph.D. Program, University of South Florida, Tampa, FL, USA
- Tumor Biology Department, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Tao Li
- Tumor Biology Department, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Ayaz Muhammad
- Department of Drug Discovery, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Harshani R Lawrence
- Department of Drug Discovery, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Nicholas J Lawrence
- Department of Drug Discovery, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA
| | - Leah M Cook
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Conor C Lynch
- Tumor Biology Department, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL, USA.
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4
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Prostate cancer-derived MMP-3 controls intrinsic cell growth and extrinsic angiogenesis. Neoplasia 2020; 22:511-521. [PMID: 32896761 PMCID: PMC7481881 DOI: 10.1016/j.neo.2020.08.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 08/12/2020] [Accepted: 08/14/2020] [Indexed: 01/06/2023] Open
Abstract
Bone metastatic prostate cancer significantly impacts patient quality of life and overall survival, and despite available therapies, it is presently incurable with an unmet need for improved treatment options. As mediators of tumor progression, matrix metalloproteinases (MMPs) can degrade extracellular matrix components and regulate growth factor and cytokine bioactivity. Depending on tissue context, MMPs can either promote or inhibit tumorigenesis. Therefore, it is essential to study individual MMPs in specific cancer contexts and microenvironments to support the design and application of selective MMP inhibitors. Here we report that tumor-derived MMP-3 contributes to bone metastatic prostate cancer progression via intrinsic and extrinsic routes. MMP-3 ablation in prostate cancer cell lines significantly reduced in vitro growth combined with lowered AKT and ERK phosphorylation and total VEGFR1 and FGFR3 protein levels. In vivo, MMP-3 ablated tumors grew at a slower rate and were significantly less vascularized. Quantitative PCR analyses of wild type and MMP-3 silenced prostate cancer cells also demonstrate downregulation of a wide array of angiogenic factors. The extrinsic role for MMP-3 in angiogenesis was supported by in vitro endothelial tube formation assays where the lack of MMP-3 in prostate cancer conditioned media resulted in slower rates of tube formation. Taken together, our results suggest that tumor-derived MMP-3 contributes to prostate cancer growth in bone. These data indicate that selective inhibition of MMP-3 and/or targeting MMP generated products could be efficacious for the treatment of prostate to bone metastases.
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Gao S, Xu J, Lu W. Research on the improvement of the diagnostic effect of machine learning on nuclear magnetic resonance of brain tumors. JOURNAL OF INTELLIGENT & FUZZY SYSTEMS 2019. [DOI: 10.3233/jifs-179212] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Shuyan Gao
- The CT Room in Yulin City Traditional Chinese Medicine Hospital of Shaanxi, Shanxi, China
| | - Jiaqi Xu
- Burn and Plastic Surgery, the Fifth Affiliated Hospital Sun Yat-sen University, Zhuhai, China
| | - Weiheng Lu
- Neurology Department, Dongguan Third People’s Hospital, Dongguan, China
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Iglesias JE, Crampsie S, Strand C, Tachrount M, Thomas DL, Holton JL. Effect of Fluorinert on the Histological Properties of Formalin-Fixed Human Brain Tissue. J Neuropathol Exp Neurol 2019; 77:1085-1090. [PMID: 30364998 PMCID: PMC6234979 DOI: 10.1093/jnen/nly098] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 10/03/2018] [Indexed: 11/15/2022] Open
Abstract
Fluorinert (perfluorocarbon) represents an inexpensive option for minimizing susceptibility artifacts in ex vivo brain MRI scanning, and provides an alternative to Fomblin. However, its impact on fixed tissue and histological analysis has not been rigorously and quantitatively validated. In this study, we excised tissue blocks from 2 brain regions (frontal pole and cerebellum) of 5 formalin-fixed specimens (2 progressive supranuclear palsy cases, 3 controls). We excised 2 blocks per region per case (20 blocks in total), one of which was subsequently immersed in Fluorinert for a week and then returned to a container with formalin. The other block from each region was kept in formalin for use as control. The tissue blocks were then sectioned and histological analysis was performed on each, including routine stains and immunohistochemistry. Visual inspection of the stained histological sections by an experienced neuropathologist through the microscope did not reveal any discernible differences between any of the samples. Moreover, quantitative analysis based on automated image patch classification showed that the samples were almost indistinguishable for a state-of-the-art classifier based on a deep convolutional neural network. The results showed that Fluorinert has no effect on subsequent histological analysis of the tissue even after a long (1 week) period of immersion, which is sufficient for even the lengthiest scanning protocols.
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Affiliation(s)
- Juan Eugenio Iglesias
- Department of Medical Physics and Biomedical Engineering, Centre for Medical Image Computing
| | - Shauna Crampsie
- Queen Square Brain Bank, UCL Queen Square Institute of Neurology
| | - Catherine Strand
- Queen Square Brain Bank, UCL Queen Square Institute of Neurology
| | - Mohamed Tachrount
- Neuroradiological Academic Unit, Department of Brain Repair and Rehabilitation, UCL Queen Square Institute of Neurology
| | - David L Thomas
- Neuroradiological Academic Unit, Department of Brain Repair and Rehabilitation, UCL Queen Square Institute of Neurology.,UCL Queen Square Institute of Neurology, Leonard Wolfson Experimental Neurology Centre, University College London, London, UK
| | - Janice L Holton
- Queen Square Brain Bank, UCL Queen Square Institute of Neurology
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7
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Zhang J, Garwood M, Park JY. Full analytical solution of the bloch equation when using a hyperbolic-secant driving function. Magn Reson Med 2017; 77:1630-1638. [PMID: 27171915 PMCID: PMC5107179 DOI: 10.1002/mrm.26252] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 03/07/2016] [Accepted: 03/31/2016] [Indexed: 12/22/2022]
Abstract
PURPOSE The frequency-swept pulse known as the hyperbolic-secant (HS) pulse is popular in NMR for achieving adiabatic spin inversion. The HS pulse has also shown utility for achieving excitation and refocusing in gradient-echo and spin-echo sequences, including new ultrashort echo-time imaging (e.g., Sweep Imaging with Fourier Transform, SWIFT) and B1 mapping techniques. To facilitate the analysis of these techniques, the complete theoretical solution of the Bloch equation, as driven by the HS pulse, was derived for an arbitrary state of initial magnetization. METHODS The solution of the Bloch-Riccati equation for transverse and longitudinal magnetization for an arbitrary initial state was derived analytically in terms of HS pulse parameters. The analytical solution was compared with the solutions using both the Runge-Kutta method and the small-tip approximation. RESULTS The analytical solution was demonstrated on different initial states at different frequency offsets with/without a combination of HS pulses. Evolution of the transverse magnetization was influenced significantly by the choice of HS pulse parameters. The deviation of the magnitude of the transverse magnetization, as obtained by comparing the small-tip approximation to the analytical solution, was < 5% for flip angles < 30 °, but > 10% for the flip angles > 40 °. CONCLUSION The derived analytical solution provides insights into the influence of HS pulse parameters on the magnetization evolution. Magn Reson Med 77:1630-1638, 2017. © 2016 International Society for Magnetic Resonance in Medicine.
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Affiliation(s)
- Jinjin Zhang
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, Minneapolis, MN, United States
| | - Michael Garwood
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, Minneapolis, MN, United States
| | - Jang-yeon Park
- Center for Neuroscience Imaging Research, Institute for Basic Science, Suwon, Gyeonggi-do, South Korea
- Department of Biomedical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, South Korea
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8
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Sukenari T, Ikoma K, Horii M, Umeda M, Kido M, Hayashi S, Hara Y, Yamasaki T, Onishi O, Morihara T, Fujiwara H, Kawata M, Kubo T. Investigation of the Longitudinal Relaxation Time of Rat Tibial Cortical Bone Using SWIFT. Magn Reson Med Sci 2016; 16:351-356. [PMID: 27941296 PMCID: PMC5743527 DOI: 10.2463/mrms.tn.2016-0050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Sweep imaging with Fourier transform (SWIFT) method has been developed to image tissues with very short T2 values, such as cortical bone. The purpose of this study was to measure the T1 value of the rat cortical bone. It was approximately 120 ms on 7.04T. This result could thus be useful for studying bony tissue according to the SWIFT method in the future.
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Affiliation(s)
- Tsuyoshi Sukenari
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
| | - Kazuya Ikoma
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
| | - Motoyuki Horii
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
| | - Masahiro Umeda
- Department of Medical Informatics, Meiji University of Integrative Medicine
| | - Masamitsu Kido
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
| | - Shigeki Hayashi
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
| | - Yusuke Hara
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
| | - Tetsuro Yamasaki
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
| | - Okihiro Onishi
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
| | - Toru Morihara
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
| | - Hiroyoshi Fujiwara
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
| | - Mitsuhiro Kawata
- Department of Anatomy and Neurobiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
| | - Toshikazu Kubo
- Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
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Zhang J, Idiyatullin D, Corum CA, Kobayashi N, Garwood M. Gradient-modulated SWIFT. Magn Reson Med 2015; 75:537-46. [PMID: 25800547 DOI: 10.1002/mrm.25595] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 11/17/2014] [Accepted: 12/08/2014] [Indexed: 01/20/2023]
Abstract
PURPOSE Methods designed to image fast-relaxing spins, such as sweep imaging with Fourier transformation (SWIFT), often utilize high excitation bandwidth and duty cycle, and in some applications the optimal flip angle cannot be used without exceeding safe specific absorption rate (SAR) levels. The aim is to reduce SAR and increase the flexibility of SWIFT by applying time-varying gradient-modulation (GM). The modified sequence is called GM-SWIFT. THEORY AND METHODS The method known as gradient-modulated offset independent adiabaticity was used to modulate the radiofrequency (RF) pulse and gradients. An expanded correlation algorithm was developed for GM-SWIFT to correct the phase and scale effects. Simulations and phantom and in vivo human experiments were performed to verify the correlation algorithm and to evaluate imaging performance. RESULTS GM-SWIFT reduces SAR, RF amplitude, and acquisition time by up to 90%, 70%, and 45%, respectively, while maintaining image quality. The choice of GM parameter influences the lower limit of short T2 (*) sensitivity, which can be exploited to suppress unwanted image haze from unresolvable ultrashort T2 (*) signals originating from plastic materials in the coil housing and fixatives. CONCLUSIONS GM-SWIFT reduces peak and total RF power requirements and provides additional flexibility for optimizing SAR, RF amplitude, scan time, and image quality.
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Affiliation(s)
- Jinjin Zhang
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA.,School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota, USA
| | - Djaudat Idiyatullin
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Curtis A Corum
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Naoharu Kobayashi
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
| | - Michael Garwood
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota Medical School, Minneapolis, Minnesota, USA
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Sukenari T, Horii M, Ikoma K, Kido M, Hayashi S, Hara Y, Yamasaki T, Matsuda KI, Kawata M, Kubo T. Cortical bone water changes in ovariectomized rats during the early postoperative period: Objective evaluation using sweep imaging with Fourier transform. J Magn Reson Imaging 2014; 42:128-35. [DOI: 10.1002/jmri.24765] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2014] [Accepted: 09/08/2014] [Indexed: 01/08/2023] Open
Affiliation(s)
- Tsuyoshi Sukenari
- Department of Orthopaedics, Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
| | - Motoyuki Horii
- Department of Orthopaedics, Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
| | - Kazuya Ikoma
- Department of Orthopaedics, Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
| | - Masamitsu Kido
- Department of Orthopaedics, Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
| | - Shigeki Hayashi
- Department of Orthopaedics, Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
| | - Yusuke Hara
- Department of Orthopaedics, Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
| | - Tetsuro Yamasaki
- Department of Orthopaedics, Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
| | - Ken-ichi Matsuda
- Department of Anatomy and Neurobiology, Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
| | - Mitsuhiro Kawata
- Department of Anatomy and Neurobiology, Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
| | - Toshikazu Kubo
- Department of Orthopaedics, Graduate School of Medical Science; Kyoto Prefectural University of Medicine; Kyoto Japan
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Wang L, Tang W, Zhen Z, Chen H, Xie J, Zhao Q. Improving detection specificity of iron oxide nanoparticles (IONPs) using the SWIFT sequence with long T(2) suppression. Magn Reson Imaging 2014; 32:671-8. [PMID: 24666573 DOI: 10.1016/j.mri.2014.02.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 01/08/2014] [Accepted: 02/11/2014] [Indexed: 01/25/2023]
Abstract
In order to improve the detection specificity of iron oxide nanoparticles (IONPs) delivered to tumors, we embedded saturation pulses into the sweep imaging using Fourier transformation (SWIFT) sequence to suppress long T(2) tissues and fat. Simulation of the Bloch equation was first conducted to study behavior of the saturation pulses of various lengths under different T(2) and off-resonance conditions. MR experiments were then conducted using in vivo mouse xenografts and a phantom consisting of IONPs, vegetable oil, and explanted tumor specimen, without and with long T(2) suppression under a 7T magnetic field. For the in vivo study, arginine-glycine-aspartate (RGD) coated 10nm IONPs (RGD-IONPs) were delivered to tumors implanted in nude mice through both intra-tumor and intravenous injections. Histological studies confirmed that RGD-IONPs efficiently homed to tumors through RGD-integrin interaction. Compared to conventional SWIFT, the proposed method resulted in sufficient suppression on long T(2) species but less influence on short T(2) species. For both the in vivo and ex vivo studies, significantly improved contrast-to-noise ratio (CNR) was achieved between the IONPs and the long T(2) species.
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Affiliation(s)
- Luning Wang
- Department of Physics and Astronomy, University of Georgia, Athens, US; BioImaging Research Center (BIRC), University of Georgia, Athens, US
| | - Wei Tang
- Department of Chemistry, University of Georgia, Athens, US
| | - Zipeng Zhen
- Department of Chemistry, University of Georgia, Athens, US
| | - Hongming Chen
- Department of Chemistry, University of Georgia, Athens, US
| | - Jin Xie
- Department of Chemistry, University of Georgia, Athens, US; BioImaging Research Center (BIRC), University of Georgia, Athens, US
| | - Qun Zhao
- Department of Physics and Astronomy, University of Georgia, Athens, US; BioImaging Research Center (BIRC), University of Georgia, Athens, US.
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