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Image Non-Uniformity Correction in 3T Gd-EOB-DTPA-Enhanced Magnetic Resonance Imaging: Comparison among Different Software Versions

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Open Journal of Medical Imaging 2023年第3期13卷 114-126页

作者： Hirofumi Hata Yusuke Inoue Keiji Matsunaga Kaoru Fujii Toshio Tamiya Ai Nakajima yuki takato Kazuki Hashizume Department of Radiology Kitasato University Hospital Sagamihara Japan Department of Diagnostic Radiology Kitasato University School of Medicine Sagamihara Japan School of Medicine Kitasato University Sagamihara Japan

Background: Non-uniformity in signal intensity occurs commonly in magnetic resonance (MR) imaging, which may pose substantial problems when using a 3T scanner. Therefore, image non-uniformity correction is usually applied. Purpose: To compare the correction effects of the phased-array uniformity enhancement (PURE), a calibration-based image non-uniformity correction method, among three different software versions in 3T Gd-EOB-DTPA-enhanced MR imaging. Material and Methods: Hepatobiliary-phase images of a total of 120 patients who underwent Gd-EOB-DTPA-enhanced MR imaging on the same 3T scanner were analyzed retrospectively. Forty patients each were examined using three software versions (DV25, DV25.1, and DV26). The effects of PURE were compared by visual assessment, histogram analysis of liver signal intensity, evaluation of the spatial distribution of correction effects, and evaluation of quantitative indices of liver parenchymal enhancement. Results: The visual assessment indicated the highest uniformity of PURE-corrected images for DV26, followed by DV25 and DV25.1. Histogram analysis of corrected images demonstrated significantly larger variations in liver signal for DV25.1 than for the other two versions. Although PURE caused a relative increase in pixel values for central and lateral regions, such effects were weaker for DV25.1 than for the other two versions. In the evaluation of quantitative indices of liver parenchymal enhancement, the liver-to-muscle ratio (LMR) was significantly higher for the corrected images than for the uncorrected images, but the liver-to-spleen ratio (LSR) showed no significant differences. For corrected images, the LMR was significantly higher for DV25 and DV26 than for DV25.1, but the LSR showed no significant differences among the three versions. Conclusion: There were differences in the effects of PURE among the three software versions in 3T Gd-EOB-DTPA-enhanced MR imaging. Even if the non-uniformity correction method has the sa

关键词： Gd-EOB-DTPA Non-Uniformity Correction 3 Tesla Software Version Image Contrast

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A Case of Pleomorphic Adenoma of the Parotid Gland with Multiple Local Recurrences through Facial to Cervical Regions

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Open Journal of Stomatology 2014年第9期4卷 441-445页

作者： Masanobu Abe Yoshiyuki Mori yuki Kanno Kazuto Hoshi Hideto Saijo Takahiro Abe Kazumi Ohkubo Tsuyoshi takato Department of Oral & Maxillofacial Surgery University of Tokyo Hospital Tokyo Japan

Pleomorphic adenoma is the most common benign parotid gland tumor. Although its local recurrence rate is known to be high, the recurrence extending to the cervical region is rare. Here we report a case of a young female (25 years old) with pleomorphic adenoma of the parotid gland which showed multiple recurrences through facial to cervical regions over a span of eight years. We also discuss how this benign tumor with a high recurrence rate has been treated in other cases, and how it should be treated.

关键词： Pleomorphic Adenoma Parotid Gland Salivary Neoplasm

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Feasibility study of laser-driven neutron sources for pharmaceutical applications

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High Power Laser Science and Engineering 2023年第2期11卷 37-43页

作者： takato Mori Akifumi Yogo Yasunobu Arikawa Takehito Hayakawa Seyed R.Mirfayzi Zechen Lan Tianyun Wei yuki Abe Mitsuo Nakai Kunioki Mima Hiroaki Nishimura Shinsuke Fujioka Ryosuke Kodama Institute of Laser Engineering Osaka UniversitySuitaJapan National Institutes for Quantum Science and Technology TokaiJapan Tokamak Energy Ltd. AbingdonUK Graduate School of Engineering Osaka UniversitySuitaJapan Fukui University of Technology FukuiJapan

We predict the production yield of a medical radioisotope^(67)Cu using^(67)Zn(n,p)^(67)Cu and ^(68)Zn(n,pn)^(67)Cu reactions with fast neutrons provided from laser-driven neutron *** neutrons were generated by the p+9Be and d+9Be reactions with high-energy ions accelerated by laser–plasma *** evaluated the yield to be(3.3±0.5)×10^(5) atoms for^(67)Cu,corresponding to a radioactivity of 1.0±0.2 Bq,for a Zn foil sample with a single laser *** a simulation with this result,we estimated^(67)Cu production with a high-frequency *** result suggests that it is possible to generate^(67)Cu with a radioactivity of 270 MBq using a future laser system with a frequency of 10 Hz and 10,000-s radiation in a hospital.

关键词： laser ion acceleration laser-driven neutron source medical radioisotope

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