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Optimization of Inversion Time for Postmortem Fluid-attenuated Inversion Recovery (FLAIR) MR Imaging at 1.5T: Temperature-based Suppression of Cerebrospinal Fluid
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- ABE Kazuyuki
- Department of Radiological Science, Faculty of Health Sciences, Junshin Gakuen University
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- KOBAYASHI Tomoya
- Department of Radiological Technology, Tsukuba Medical Center Hospital
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- SHIOTANI Seiji
- Department of Radiology, Tsukuba Medical Center Hospital
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- SAITO Hajime
- Department of Radiological Technology, Tsukuba Medical Center Hospital
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- KAGA Kazunori
- Department of Radiological Technology, Tsukuba Medical Center Hospital
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- TASHIRO Kazuya
- Department of Radiological Technology, Tsukuba Medical Center Hospital
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- SOMEYA Satoka
- Department of Radiological Technology, Tsukuba Medical Center Hospital
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- HAYAKAWA Hideyuki
- Department of Forensic Medicine, Tsukuba Medical Examiner’s Office
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- HOMMA Kazuhiro
- The National Institute of Advanced Industrial Science and Technology, Human Technology Research Institute
Bibliographic Information
- Other Title
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- Optimization of inversion time for postmortem fluid attenuated inversion recovery (FLAIR) MR imaging at 1.5 Tesla
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Description
Purpose: Signal intensity (SI) and image contrast on postmortem magnetic resonance (MR) imaging are different from those of imaging of living bodies. We sought to suppress the SI of cerebrospinal fluid (CSF) sufficiently for fluid-attenuated inversion recovery (FLAIR) sequence in postmortem MR (PMMR) imaging by optimizing inversion time (TI).<br/>Materials and Methods: We subject 28 deceased patients to PMMR imaging 3 to 113 hours after confirmation of death (mean, 27.4 hrs.). PMMR imaging was performed at 1.5 tesla, and T1 values of CSF were measured with maps of relaxation time. Rectal temperatures (RT) measured immediately after PMMR imaging ranged from 6 to 32°C (mean, 15.4°C). We analyzed the relationship between T1 and RT statistically using Pearson’s correlation coefficient. We obtained FLAIR images from one cadaver using both a TI routinely used for living bodies and an optimized TI calculated from the RT.<br/>Results: T1 values of CSF ranged from 2159 to 4063 ms (mean 2962.4), and there was a significantly positive correlation between T1 and RT (r = 0.96, P < 0.0001). The regression expression for the relationship was T1 = 74.4 * RT + 1813 for a magnetic field strength of 1.5T. The SI of CSF was effectively suppressed with the optimized TI (0.693 * T1), namely, TI = 0.693 * (77.4 * RT + 1813).<br/>Conclusion: Use of the TI calculated from the linear regression of the T1 and RT optimizes the FLAIR sequence of PMMR imaging.
Journal
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- Magnetic Resonance in Medical Sciences
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Magnetic Resonance in Medical Sciences 14 (4), 251-255, 2015
Japanese Society for Magnetic Resonance in Medicine
