Discrepancy in T_1 and T_2 Shortening of the Globus Pallidus in Hepatic Insufficiency : Evaluation by Susceptibility-weighted Imaging
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概要
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Purpose: We assessed the signal of the globus pallidus (GP) in cases of hepatic insufficiency, especially to evaluate the degree of discrepancy in paramagnetic effects on shortening of T1 and T2* using susceptibility-weighted images (SWI). Materials and Methods: Seven patients with hepatic insufficiency underwent magnetic resonance (MR) examinations that included T1-weighted images (T1WI), T2-weighted images (T2WI), and SWI on a 1.5-tesla MR imager, and we compared their results to those of controls. On T1WI and T2WI, we measured signal intensity in the GP and posterior segment of the putamen (Put) to obtain a signal ratio (GP/Put ratio), and on SWI, we classified signal intensity into 4 grades: A, higher than the cortex; B, lower than the cortex and higher than the cerebrospinal fluid (CSF); C, lower than the CSF and higher than the red nucleus; and D, lower than the red nucleus. Results: In the 7 patients with hepatic insufficiency, the mean GP/Put ratio was significantly higher on T1WI and T2WI than those values in controls. On SWI, we classified 2 cases each as Grade A, Grade B, and Grade C, and one as Grade D. Although the signal of the GP was elevated on T1WI, there was no decrease in signal on T2WI. On SWI, we obtained no low signal intensity. Conclusion: In patients with hepatic insufficiency, the globus pallidus did not show low signal intensity on either T2WI or SWI. Hyperintensity of the GP on T1WI without hypointensity on T2WI, or even SWI, suggests a discrepancy between paramagnetic effect on T1 and T2 shortening that reflects the accumulation of manganese and the presence of hepatic insufficiency.
- 日本磁気共鳴医学会の論文
- 2011-06-01
著者
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MIYASAKA Toshiteru
Department of Radiology, Nara Medical University
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SAKAMOTO Masahiko
Department of Radiology, Nara Medical University
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Nakagawa Hiroyuki
Department Of Applied Chemistry School Of Science And Engineering Waseda University
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Wada Takeshi
Department Of Interventional Neuroradiology Ishinkai Yao General Hospital
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Taoka Toshiaki
Department Of Radiology Nara Medical University
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Sakamoto Masahiko
Department Of Radiology Nara Medical University
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Kichikawa Kimihiko
Department Of Radilogy Nara Medical University
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Nakagawa Hiroyuki
Department Of Radiology Nara Medical University
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Miyasaka Toshiteru
Department Of Radiology Nara Medical University
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Sakamoto Masahiko
Department Of Pediatrics Anjo Kosei Hospital
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Wada Takeshi
Department Of Electronics Faculty Of Engineering Kyoto University
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Tatsuno Kentaro
Department Of Medical Nara Medical University
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OCHI Tomoko
Department of Radiology, Nara Medical University
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AKASHI Toshiaki
Department of Radiology, Nara Medical University
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TAKEHANA Keiichi
Department of Medical, Nara Medical University
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Ochi Tomoko
Department Of Radiology Nara Medical University
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Akashi Toshiaki
Department Of Radiology Nara Medical University
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Takehana Keiichi
Department Of Medical Nara Medical University
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Sakamoto Masahiko
Department Of Cardiology Tokyo Metropolitan Hiroo Hospital
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