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2002 Volume 58 Issue 3 Pages
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Article type: Index
2002 Volume 58 Issue 3 Pages
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2002 Volume 58 Issue 3 Pages
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[in Japanese]
Article type: Article
2002 Volume 58 Issue 3 Pages
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2002 Volume 58 Issue 3 Pages
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2002 Volume 58 Issue 3 Pages
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2002 Volume 58 Issue 3 Pages
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2002 Volume 58 Issue 3 Pages
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2002 Volume 58 Issue 3 Pages
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Article type: Appendix
2002 Volume 58 Issue 3 Pages
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FUMIO OKUYAMA
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2002 Volume 58 Issue 3 Pages
309-313
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Hisashi Maekoshi
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2002 Volume 58 Issue 3 Pages
314-321
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AKIRA YOSHIDA, [in Japanese], [in Japanese], [in Japanese], [in Japane ...
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2002 Volume 58 Issue 3 Pages
322-329
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TORU KIKUCHI
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2002 Volume 58 Issue 3 Pages
330-335
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Standardization Committee
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2002 Volume 58 Issue 3 Pages
336-347
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MICHITOMO KUMAGAI
Article type: Article
2002 Volume 58 Issue 3 Pages
348-354
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KATSUMI TSUJIOKA
Article type: Article
2002 Volume 58 Issue 3 Pages
355-359
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KAZUYA YAMASHITA
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2002 Volume 58 Issue 3 Pages
360-370
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TAKENORI TOMITA
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2002 Volume 58 Issue 3 Pages
371-373
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YUJI HATANAKA, TOMOKO MATSUBARA, TAKESHI HARA, NORIMITSU SHINOHARA, DA ...
Article type: Article
2002 Volume 58 Issue 3 Pages
375-382
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We have been developing automated detection algorithms for masses and clustered microcalcifications in a mammography computer-aided diagnosis (CAD) system. In this study, we investigated the potential of our CAD system by comparing 579 physicians' interpretation results with that of the CAD system's cancer detection for 100 mammograms (21 malignant and 29 benign cases) employed in a physicians' self-learning course. As a result, our CAD system detected 7 out of 8 malignant lesions whose physicians' averaged sensitivity was less than 60%. Although the average of physicians sensitivities were 76% (about 16 cases), the CAD system's detection rate was 90% (19 cases). Sensitivity was raised up to 97% if the physicians' interpretation and the CAD system's detection result were treated in a matter of logical OR. Thus, it was raised the possibility that even the less-experienced physicians would diagnose with a higher sensitivity by using the computer output as a guide effectively.
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MASAYUKI TACHIBANA, TAKASHI IZUMI
Article type: Article
2002 Volume 58 Issue 3 Pages
383-389
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When the absorbed dose conversion factor of the x-rays is looked for, generally it is being done how to measure the effective energy (keV) from the half-value layer. But, spectrum measurement is necessary to evaluate quality of x-ray precisely. So, 2.94% of the maximum differences were in the water, soft tissue, and 20.93 % of the maximum differences were in search of absorbed dose conversion factor due to the halfvalue layer and the spectrum as a compared result by cortical bone. And, when a x-ray tube voltage rose, this difference showed a tendency of spreading out. A cause was because the rates of the photon of the higher energy than the energy measured with effective energy increased by a x-ray tube voltage's rising. The ratio of the mass energy absorption coefficient which faces air like cortical bone should be careful because an error by the absorbed dose conversion factor grows big when a absorbed dose conversion factor is measured by the big absorption medium, though it is as the difference in absorbed dose conversion factor is compared with an error by the dosimeter and there is no problem in the water, soft tissue.
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TOMOHIKO HORIE, YUKI TEZUKA, YUUKI SATOU, TAKAYUKI HASEGAWA, SHINJI HA ...
Article type: Article
2002 Volume 58 Issue 3 Pages
390-398
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The carpometacarpal joint of the thumb is the most important in manual exercise function. Robert method is used for the projection for carp metacarpal joint of the thumb broadly. But, the physique is difficult when there is a pain to a person of advanced age and an upper drumstick in Robert method. So, we devised the photography method that reduced patient burden. Comparison examined Robert method and Tokai method. Detect ability is equal in both method. Patient burden is reduced in Tokai method. Therefore, it isn't influenced a state of patient, and application range is useful broadly.
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RYUJIRO YOKOYAMA, YONGBUM LEE, TAKESHI HARA, HIROSHI FUJITA, TAKAHIKO ...
Article type: Article
2002 Volume 58 Issue 3 Pages
399-405
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The purpose of this study is to develop a technique to detect lacunar infarct regions automatically in brain MR images. Our detection method is based on the definition of lacunar infarcts. After inputted images were binarized, we used feature values such as area, circularities and the center of gravity of candidate regions to extract isolated lacunar infarct regions. We also developed and used a new filter to enhance the signals of lacunar infarcts adjacent to some high intensity regions. 10 cases involving 81 sectional images were applied to our experiment. As a result, the sensitivity was 100% with approximately 1.77 false-positives per image. Our results are promising on the first stage, although it remains to improve on problems that to eliminate false-positives and automatically establish threshold value.
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TOSHIO TSUCHIHASHI, ISAO FUJITA, ATSUSHI IWASAKI, KATSUHIKO MORI, TAKE ...
Article type: Article
2002 Volume 58 Issue 3 Pages
406-412
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During this project, we evaluated methods to prevent high-signal artifact (marching metal artifact) that are caused by magnetic substance. Marching metal artifact is caused by the resonance frequency created by magnetic substance. Phase encoding and frequency encoding are often switched to minimize the influence that marching metal artifact have on the image. However, this method will only change the position at which marching metal artifact occur. It does not have the ability to completely prevent marching metal artifact. Our research illustrated that marching metal artifact can be prevented by changing the strength of the slice selective gradient field at the 90° RF pulse and 180° RF pulse. In other words, marching metal artifact can be prevented by changing the frequency bandwidth for the 90° RF pulse and 180° RF pulse. The incorporation of the phase correct option in the device used for our research (SIGNA LX and SIGNA CV/i) results in different slice selective gradient field strengths at the 90° RF pulse and the 180° RF pulse. This indicates that the use of phase correction enables marching metal artifact to be prevented.
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KAZUMA MATSUMOTO, KIYOSHI SAKAMOTO, TAKAYOSHI UMEHARA, KATSUHIKO MAEDA ...
Article type: Article
2002 Volume 58 Issue 3 Pages
413-419
Published: March 20, 2002
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Purpose: When brain angiography was performed, we devised the calculation theory for rectifying magnifying power, and produced the auxiliary tool. Method: We produced the frame with a size of 300×300×15mm from the thin board made from carbon. The frame is around arranged for every 1 cm in Pb-ball of the diameter of 1 mm. We named this the measuring-chart. The measuring-chart has been arranged so that head may be surrounded. A photograph of a measuring-chart and head was taken simultaneously. The projected mark used for computing the magnifying power of a brain aneurysm. Magnifying power was used in order to measure the size of an aneurysm. Results: In the basic experiment using the stainless-steel ball whose size is known, the standard error was -2.29%±5.61%. A measurement value and true value showed high correlation (R^2=0.9986). Conclusion: The measuring-chart did not need a proofreading factor peculiar to equipment. This method had high accuracy. This method has high flexibility. It suggested that this method was useful on clinical use.
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MASAFUMI AMANO, HIROMU NISHITANI, SHINGO KOHNO, MOTOKATSU YASUTOMO, HI ...
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2002 Volume 58 Issue 3 Pages
420-423
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Katsuyuki Taguchi
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2002 Volume 58 Issue 3 Pages
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Shoichi Arai
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2002 Volume 58 Issue 3 Pages
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Article type: Appendix
2002 Volume 58 Issue 3 Pages
426-428
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2002 Volume 58 Issue 3 Pages
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2002 Volume 58 Issue 3 Pages
430-435
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2002 Volume 58 Issue 3 Pages
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2002 Volume 58 Issue 3 Pages
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Article type: Appendix
2002 Volume 58 Issue 3 Pages
439-440
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Article type: Appendix
2002 Volume 58 Issue 3 Pages
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Article type: Cover
2002 Volume 58 Issue 3 Pages
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