巻号一覧
62 巻, 9 号
選択された号の論文の8件中1～8を表示しています
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巻頭言
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坂田 元道2006 年 62 巻 9 号 p. 62_9_I
発行日: 2006年
公開日: 2007/02/23
ジャーナル 認証ありPDF形式でダウンロード (25K)
第34回秋季学術大会プログラム
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2006 年 62 巻 9 号 p. 1193-1317
発行日: 2006年
公開日: 2007/02/23
ジャーナル 認証ありPDF形式でダウンロード (928K)
学生のページ
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2006 年 62 巻 9 号 p. 1319-1334
発行日: 2006年
公開日: 2007/02/23
ジャーナル 認証ありPDF形式でダウンロード (471K)
JIRAトピックス
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森 智2006 年 62 巻 9 号 p. 1335-1338
発行日: 2006年
公開日: 2007/02/23
ジャーナル 認証ありPDF形式でダウンロード (205K)
論文
原著
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後藤 政実, 青木 茂樹, 阿部 修, 増本 智彦, 渡辺 靖志, 佐竹 芳朗, 西田 克次, 井野 賢司, 矢野 敬一, 飯田 恭人, 美 ...2006 年 62 巻 9 号 p. 1339-1344
発行日: 2006年
公開日: 2007/02/23
ジャーナル フリーIn recent years, voxel-based morphometry (VBM) has become a popular tool for the early diagnosis of Alzheimer disease. The Voxel-Based Specific Regional Analysis System for Alzheimer's Disease (VSRAD), a VBM system that uses MRI, has been reported to be clinically useful. The able-bodied person database (DB) of VSRAD, which employs sagittal plane imaging, is not suitable for analysis by axial plane imaging. However, axial plane imaging is useful for avoiding motion artifacts from the eyeball. Therefore, we created an able-bodied person DB by axial plane imaging and examined its utility. We also analyzed groups of able-bodied persons and persons with dementia by axial plane imaging and reviewed the validity. After using the DB of axial plane imaging, the Z-score of the intrahippocampal region improved by 8 in 13 instances. In all brains, the Z-score improved by 13 in all instances.抄録全体を表示PDF形式でダウンロード (193K)
ノート
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山田 和弘, 石森 佳幸, 藤原 康博, 山口 功, 福屋 裕子2006 年 62 巻 9 号 p. 1345-1352
発行日: 2006年
公開日: 2007/02/23
ジャーナル フリーWe examined the index of coil selection in consideration of subject size to measure signal-to-noise ratio (SNR) and uniformity in a phantom experiment. The QD-Head, 8-channel-Head, and 8-channel-Head-Neck coil were used for head examination, QD-Body, 4-channel-TORSO, and 8-channel-Body coil were used for body examination. In the examination of the head, measurements were performed at various positions in a coil. The SNR measured by the QD-Head coil showed the highest values for 9 cm or 12 cm diameters of the phantom, and 10 cm to 15 cm distance from the coil entrance. The QD-Head coil also showed adequate uniformity at most sizes of phantoms. In the body examination, both multi-channel coils showed an SNR higher than the QD-Body coil for all sizes, but they were inferior to the QD-Body coil in uniformity. The 4-channel-TORSO coil showed an SNR higher than the 8-channel-Body coil when a phantom with a diameter of 21 cm or less was used. Since sensitivity distributions differ according to various cases, the 8-channel coil does not necessarily always show a high SNR. It is necessary to perform coil selection according to the subject's size and purpose.抄録全体を表示PDF形式でダウンロード (187K) -
後藤 政実, 青木 茂樹, 阿部 修, 増本 智彦, 渡辺 靖志, 佐竹 芳朗, 西田 克次, 井野 賢司, 矢野 敬一, 飯田 恭人, 美 ...2006 年 62 巻 9 号 p. 1353-1358
発行日: 2006年
公開日: 2007/02/23
ジャーナル フリーThe use of voxel-based morphometry (VBM) has recently become a popular tool for the early diagnosis of Alzheimer disease. The Voxel-Based Specific Regional Analysis System for Alzheimer's Disease (VSRAD) is a clinically useful VBM that employs MRI. However, there has been insufficient information about the influence of the image pickup apparatus and imaging conditions in terms of the value calculated by the sensitivity correction. We therefore reviewed this problem in a volunteer who provided consent. We were able to confirm reproducibility under the same conditions. When changing the image pickup apparatus and conditions, the average Z-score of 0.18±0.21 became larger, and the change in Z-score increased when imaging was done in the axial plane. Further, the average Z-score of 0.06±0.21 for sensitivity correction use was high on average by 0.19±0.16 for phased-array uniformity enhancement (PURE) and low for surface coil intensity correction (SCIC).抄録全体を表示PDF形式でダウンロード (207K)
臨床技術
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加藤 秀起2006 年 62 巻 9 号 p. 1359-1368
発行日: 2006年
公開日: 2007/02/23
ジャーナル フリーThe anti-scatter grid is generally used as a way of eliminating scattered radiation from X-ray photographs. This does not change even if the detector system changes from an analogue system to a digital system such as the flat-panel detector. We developed a new method that uses software to eliminate scatter components from digital X-ray images taken without the use of an anti-scatter grid. With this software, scatter components are eliminated from the X-ray image according to primary-to-scatter ratios, which were calculated on the basis of an imaginary phantom constructed by the pixel value of the X-ray image and on the spectrum of irradiated X-rays. In a trial calculation using a simulation image, it was confirmed that scatter components are eliminated at a high rate that is generally constant on the whole, irrespective of the kind and presence of the inhomogeneous region. When using this technique, the amount of X-ray exposure to a patient can be substantially reduced compared with that of radiography using the anti-scatter grid. Subsequently, the patient dose can be reduced.抄録全体を表示PDF形式でダウンロード (330K)
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