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Article type: Cover
2004 Volume 60 Issue 7 Pages
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Article type: Index
2004 Volume 60 Issue 7 Pages
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Article type: Index
2004 Volume 60 Issue 7 Pages
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[in Japanese]
Article type: Article
2004 Volume 60 Issue 7 Pages
I-
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Article type: Appendix
2004 Volume 60 Issue 7 Pages
II-III
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2004 Volume 60 Issue 7 Pages
IV-VII
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2004 Volume 60 Issue 7 Pages
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2004 Volume 60 Issue 7 Pages
IX-XIII
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2004 Volume 60 Issue 7 Pages
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2004 Volume 60 Issue 7 Pages
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2004 Volume 60 Issue 7 Pages
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2004 Volume 60 Issue 7 Pages
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2004 Volume 60 Issue 7 Pages
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2004 Volume 60 Issue 7 Pages
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2004 Volume 60 Issue 7 Pages
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2004 Volume 60 Issue 7 Pages
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Inter-Society Council for Radiological Physics
Article type: Article
2004 Volume 60 Issue 7 Pages
887-895
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TAMAYO OKAMOTO
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2004 Volume 60 Issue 7 Pages
896-900
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MIKIO SANO
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2004 Volume 60 Issue 7 Pages
901-913
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HIDEO ONISHI
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2004 Volume 60 Issue 7 Pages
914-917
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HIRONORI YOKOYAMA
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2004 Volume 60 Issue 7 Pages
918-926
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KOZO KUMAGAI, [in Japanese], [in Japanese], [in Japanese], [in Japanes ...
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2004 Volume 60 Issue 7 Pages
927-938
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FUJIO ARAKI, [in Japanese], [in Japanese], [in Japanese], [in Japanese ...
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2004 Volume 60 Issue 7 Pages
939-947
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EIJI ARIGA, [in Japanese], [in Japanese], [in Japanese], [in Japanese] ...
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2004 Volume 60 Issue 7 Pages
948-959
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TSUTOMU GOMI
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2004 Volume 60 Issue 7 Pages
960-964
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SATOSHI OHNO
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2004 Volume 60 Issue 7 Pages
965-967
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EMI KINOSHITA, YOSHIYUKI UMEZU, KAZUHISA OGAWA, TOYOYUKI KATOU, HISAO ...
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2004 Volume 60 Issue 7 Pages
969-974
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In this study, we evaluated the performance of a digital chest imaging system using a contrast-detail (C-D) phantom. In the initial step, 76 sample images of the C-D phantom were produced by changing thedoses from 0.5, 0.75, 1.0, 1.25, 1.5, to 2.0 times the dose for a screen-film(S/F) system. The sample imageswere analyzed by five radiological technologists and two medical physicists, and the image quality figure (IQF) was determined. The quality of each image was examined, and appropriate doses were determinedfrom the calculated IQF to obtain the same image quality for other digital chest imaging systems. The methodof determining IQF from C-D phantom analysis was very useful for comparing image quality and determin-ing radiographic techniques.
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MASATO MAENO, KENYA UCHIDA, JUN TACHIBANA, KAORI YAMAMOTO, YUSUKE TAKE ...
Article type: Article
2004 Volume 60 Issue 7 Pages
975-982
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Many researchers are investigating brain function by using a block paradigm in fMRI measurement.However, time resolution has been limited because the block paradigm employed data collection by consecutive image acquisition after stimulation began. Because of this problem, the evaluation of early brainactivity was not adequate. Therefore, a system that was able to take imaging from a high time dependenceto stimulation in real time was necessary to evaluate early brain activity. It is necessary to obtain controlledimage taking by an MRI device with an external trigger by creating a sequence design in the system controlling stimulation and a sequence designed to achieve the above. The execution of a single paradigm by theoriginally designed sequence thus becomes possible, and arbitrarily setting all processes from stimulationto image taking is possible. It is thought that the practical use of the single paradigm designed by the control system of stimulation enables real-time imaging for stimulation and provides time-dependent data. Fromthis, evaluation of brain activity of the primary motor cortex is possible in the early stage by event-relateddata collection. In addition, "sank," a relative decrement in PO^2 was also an initial stage of BOLD, that is,an initial dip occurs as a transitory signal change by using a single paradigm that synchronizes with thecontrol system of stimulation for the evaluation of early brain activity. Moreover, it is thought that takingimages by a single paradigm that is synchronized with the control system of stimulation is indispensable fortime and spatial elucidation of detailed brain activity, to evaluate hyper brain function. Therefore, the brainactivity in the primary visual cortex at the early stage was clarified in this study by using a single paradigmdesigned to synchronize with the control system of stimulation by single-shot EPI.
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SHUICHI HENMI
Article type: Article
2004 Volume 60 Issue 7 Pages
983-992
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Even if the brain in head CT images is shown physically at the same photographic density, optical illusion (assimilation, contrast, etc.)occurs and practical density can be observed psychologically differently.Therefore, in this study, in order to clarify the visual characteristics of lightness perception in chest CT images, I attempted to compare it with the visual impression of the photographic density of lung, thorax, and mediastinum, using visual subjective evaluation. The results were as follows. (1) In the case of the preferential window setting of lung, both thorax and mediastinum, which surround the lung, are recognized as a wide white frame with contrast, and the photographic density of the lung psychologically seems blackish as a result of the "picture frame effect". (2) In the case of the preferential window setting of thorax and mediastinum, the visual impression of the photographic density varies among observers. (3) In the case of the virtual double window setting of lung, thorax, and mediastinum, under the influence of both high-density and low-density areas in the radiological anatomy of thorax and mediastinum, the photographic density of lung psychologically appears whitish as a result of the "grouping theories" of lightness computation. Further, under the influence of original gray lung, the photographic densities of thorax and mediastinum psychologically appear to be whitish.
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MASUMI HATTORI, SHUJI KOYAMA
Article type: Article
2004 Volume 60 Issue 7 Pages
993-999
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Recent research has suggested that the measurement of regional atrophy in the structure of the medialtemporal lobe is a promising way to discriminate Alzheimer-type dementia patients from healthy controlsubjects. The purpose of this study was to develop a technique to measure the medial temporal lobe automatically in axial CT images. Linear measurements of width of the inferior horns of the lateral ventricles,width of the medial temporal lobe, and the interuncal distance were performed. Area measurements of theinferior horns of the lateral ventricles were also performed. In the algorithm for the automatic measure-ment of the medial temporal lobe, brain contour, and sagittal plane were detected first, and the inferior hornsof the lateral ventricles. Our method was applied to ten patients clearly without cerebral hemorrhage orinfarct. The rates of accuracy of automated detection were 93% with the linear measurements and 75% with the area of the inferior horns. The rates were improved to 100% with the variable function of the thresholdvalue. We suggest that this automated measurement method is both objective and simple enough to be usedin routine clinical applications.
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KENICHI FUNAMIZU, RURIKO YAGIHASHI, MITSUEI SATOU, KATSUFUMI KOGAWA
Article type: Article
2004 Volume 60 Issue 7 Pages
1000-1008
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Computed radiography (CR) has many variations in gradation, and it is difficult to grasp all of them. We produced the Digital Test Pattern, a step chart made based on digital values that was created by personal computer using Binary Editor. Image data input in the CR system is replaced with the Digital Test Pattern data. A gradation curve is measuring for using the processed output image data in the CR system, such that we can determine the relation between input and output. We termed this the Digital Test Pattern method. Output characteristics after gradation processing are obtained by output signal value and input signal value. Input is known beforehand, and change in the gradation processing parameter is understood from the output pixel value. It is also possible to measure a gradation curve directly from photographic density. Measuring the relation of input and output enabled computer simulation of a gradation curve. These studies indicated the effectiveness of our proposed method in terms of accuracy and ease of use.
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MASAO KIGUCHI, KINGO TANIGUCHI, YUUJI AKIYAMA, TAKASHI FURUKAWA, TOSHI ...
Article type: Article
2004 Volume 60 Issue 7 Pages
1009-1017
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We compared filtered back projection (FBP) and ordered subset expectation maximization (OS-EM) reconstruction algorithms to examine the effects of sampling step angle on SPECT image reconstruction. Image sampling was compared between conditions of constant total sampling time(l6 min)and constant sampling time (40 sec)for each step with angles of 3, 5, 7.5, and 10 degrees. Generally, OS-EM was superior to FBP in terms of image reconstruction. Changes in the sampling step angles did not significantly affect the quality of the reconstructed images with OS-EM insofar as acquisition counts were sufficient for evaluation. On the other hand, the quality of FBP images deteriorated with larger angles such as 7.5 and 10 degrees, and it was difficult to obtain stable results. In conclusion, OS-EM improves the quality of images required for examination.
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Article type: Appendix
2004 Volume 60 Issue 7 Pages
1018-1021
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Article type: Appendix
2004 Volume 60 Issue 7 Pages
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2004 Volume 60 Issue 7 Pages
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Article type: Appendix
2004 Volume 60 Issue 7 Pages
1023-1026
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Article type: Appendix
2004 Volume 60 Issue 7 Pages
1027-1030
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Article type: Appendix
2004 Volume 60 Issue 7 Pages
1030-1032
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Article type: Appendix
2004 Volume 60 Issue 7 Pages
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2004 Volume 60 Issue 7 Pages
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2004 Volume 60 Issue 7 Pages
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Article type: Cover
2004 Volume 60 Issue 7 Pages
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