- 著者
- Shota Kondo Yuko Nakamura Toru Higaki Takashi Nishihara Masahiro Takizawa Toru Shirai Motoshi Fujimori Yoshitaka Bito Keigo Narita Takahiro Sueoka Yukiko Honda Chihiro Tani Kazuo Awai
- 出版者
- Japanese Society for Magnetic Resonance in Medicine
- 雑誌
- Magnetic Resonance in Medical Sciences (ISSN:13473182)
- 巻号頁・発行日
- pp.mp.2022-0041, (Released:2022-06-01)
- 参考文献数
- 26
Purpose: The wavelet denoising with geometry factor weighting (g-denoising) method can reduce the image noise by adapting to spatially varying noise levels induced by parallel imaging. The aim of this study was to investigate the clinical applicability of g-denoising on hepatobiliary-phase (HBP) images with gadoxetic acid.Methods: We subjected 53 patients suspected of harboring hepatic neoplastic lesions to gadoxetic acid-enhanced HBP imaging with and without g-denoising (g+HBP and g–HBP). The matrix size was reduced for g+HBP images to avoid prolonging the scanning time. Two radiologists calculated the SNR, the portal vein-, and paraspinal muscle contrast-to-noise ratio (CNR) relative to the hepatic parenchyma (liver-to-portal vein- and liver-to-muscle CNR). Two other radiologists independently graded the sharpness of the liver edge, the visibility of intrahepatic vessels, the image noise, the homogeneity of liver parenchyma, and the overall image quality using a 5-point scale. Differences between g–HBP and g+HBP images were determined with the two-sided Wilcoxon signed-rank test.Results: The liver-to-portal- and liver-to-muscle CNR and the SNR were significantly higher on g+HBP- than g–HBP images (P < 0.01), as was the qualitative score for the image noise, homogeneity of liver parenchyma, and overall image quality (P < 0.01). Although there were no significant differences in the scores for the sharpness of the liver edge or the score assigned for the visibility of intrahepatic vessels (P = 0.05, 0.43), with g+HBP the score was lower in three patients for the sharpness of the liver edge and in six patients for the visibility of intrahepatic vessels.Conclusion: At gadoxetic acid-enhanced HBP imaging, g-denoising yielded a better image quality than conventional HBP imaging although the anatomic details may be degraded.
- 著者
- Michito Namekawa Yuko Nakamura Imaharu Nakano
- 出版者
- The Japanese Society of Internal Medicine
- 雑誌
- Internal Medicine (ISSN:09182918)
- 巻号頁・発行日
- vol.52, no.7, pp.811-813, 2013 (Released:2013-04-01)
- 参考文献数
- 12
- 被引用文献数
- 9 18
Marchiafava-Bignami disease (MBD) is a rare alcohol-associated disorder characterized by demyelination and necrosis of the corpus callosum. We herein present the case of a 56-year-old man with chronic alcoholism who was admitted to our hospital in a coma without focal or lateralizing neurological signs. MRI revealed a callosal lesion consistent with MBD and additional bifrontal linear cortical lesions. The callosal lesion completely disappeared with intravenous administration of high-dose multivitamins and corticosteroids, although the patient remained in a vegetative state. This case further supports the notion that cortical involvement in patients with MBD is a predictor of a poor prognosis.