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Article type: Cover
2000 Volume 56 Issue 6 Pages
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Article type: Index
2000 Volume 56 Issue 6 Pages
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Article type: Index
2000 Volume 56 Issue 6 Pages
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Article type: Appendix
2000 Volume 56 Issue 6 Pages
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2000 Volume 56 Issue 6 Pages
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2000 Volume 56 Issue 6 Pages
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2000 Volume 56 Issue 6 Pages
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Article type: Appendix
2000 Volume 56 Issue 6 Pages
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Article type: Appendix
2000 Volume 56 Issue 6 Pages
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2000 Volume 56 Issue 6 Pages
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2000 Volume 56 Issue 6 Pages
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Article type: Appendix
2000 Volume 56 Issue 6 Pages
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Article type: Appendix
2000 Volume 56 Issue 6 Pages
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TETSUHARU MIYASHITA, [in Japanese], [in Japanese], [in Japanese], [in ...
Article type: Article
2000 Volume 56 Issue 6 Pages
773-779
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TOORU KOBAYASHI
Article type: Article
2000 Volume 56 Issue 6 Pages
780-791
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FUKAI TOYOFUKU, [in Japanese]
Article type: Article
2000 Volume 56 Issue 6 Pages
792-797
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JUNICHI WAKISAKA
Article type: Article
2000 Volume 56 Issue 6 Pages
798-802
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RYUJI SUZUKI
Article type: Article
2000 Volume 56 Issue 6 Pages
803-805
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KATSUHIRO ICHIKAWA
Article type: Article
2000 Volume 56 Issue 6 Pages
806-813
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Equipment Safety Inspection Study Project
Article type: Article
2000 Volume 56 Issue 6 Pages
814-818
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SHUJI KOYAMA, TAKAHIKO AOYAMA, HISASHI MAEKOSHI, SHIGEKI ITOH
Article type: Article
2000 Volume 56 Issue 6 Pages
819-825
Published: May 20, 2000
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Measurement of the saturated dose integral for x-ray CT examination was done by using a newly developed scintillating fiber dosimeter with a long detection length of 880 mm, by inserting it into a human chest phantom. The saturated dose integral measured for the chest phantom, which was composed of MixDp and cork for the lung, was 2.4 mGy under the x-ray irradiation conditions used in lung cancer screening tests. The dose values measured were about 30% greater than those obtained with conventional CT ion chambers because of the large dose distribution outside the effective length of 100 mm of CT ion chambers. The reason of the large dose distribution outside the beam position of x-ray CT devices was examined with 3 mm-thick lead absorbers inserted into the chest phantom and surrounding the phantom. It was found that the large dose distribution was due to the scattering of x-rays in the phantom and that the contribution of x-ray leakage from CT devices was negligible. When absorbed doses are measured with conventional CT ion chambers, it is recommended that they be multiplied by a factor of 1.3 to obtain saturated dose integrals for x-ray CT devices.
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SHIGEO ANAI, TAKASHI IZUMI, GOROU KIDO, KOUJI KOBAYASHI, MASANORI YOSH ...
Article type: Article
2000 Volume 56 Issue 6 Pages
826-833
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We carried out basic studies on compensating material to an obtain uniform dose for the whole body in total body irradiation (TBI) with a 10MV x-ray. Water was used as a water-compensating filter (WCF). We determined experimentally the thickness of the WCF that could eliminate the scattering effect in a phantom and maintain the absorbed dose constant in the phantom. It was found that, when the distance between the WCF and the phantom was more than 250 cm, scattering from the WCF was negligible. In order to keep the absorbed dose constant, the thickness of the WCF had to be changed according to changes in the thickness of the phantom. In general, the absorbed dose in the phantom increased according to field size. For example, when the thickness of the head and pelvis was the same, the absorbed dose of the pelvis was greater. The reason for this was internal scattering with different volumes of the human body. As a result, the compensating thickness of the head was much less than that of the pelvis.
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MOTOMICHI SAKATA, MASAKI KAMAGATA, KUNIAKI HARADA, RYUJI SHIRASE, HIDE ...
Article type: Article
2000 Volume 56 Issue 6 Pages
834-839
Published: May 20, 2000
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The purpose of this study was to evaluate the usefulness of axial and three-dimensional imaging (virtual endoscopy) with helical CT for the detection of ossicular chain abnormalities. In 15 patients who had traumatic ossicular dislocation, disruption, and congenital ossicular defect and anomaly, axial helical CT scanning of the temporal bone was performed with GE HSA. Axial and three-dimensional imaging was carried out in normal ears (15 ears) and abnormal ears (10 ears), for the detection of ossicular chain abnormalities. Diagnostic accuracy was evaluated by receiver-operating-characteristic (ROC) curve analysis using a continuous reporting scale. Furthermore, ROC testing was done to determine the sensitivity, specificity, and accuracy of the detection of ossicular chain abnormalities. Diagnostic accuracy in the detection of ossicular chain abnormalities with three-dimensional imaging (A_z=0.967, SD=0.022) was not significantly better than that of axial imaging (A_z=0.930, SD=0.046); however, the interobserver standard deviation was better for three-dimensional imaging. Three-dimensional imaging resulted in an increase in true positive cases and a decrease in false negatives. Three-dimensional imaging also showed higher sensitivity and accuracy. In the evaluation of ossicular chain abnormalities, three-dimensional imaging (virtual endoscopy) is useful and provides additional information. Three-dimensional imaging may have an important role in diagnostic procedures and / or preoperative evaluation in otology.
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FUJIMI KINOSHITA, YUKO TANAKA, TOMOHIKO KIHARA, NOBUHARU YUI
Article type: Article
2000 Volume 56 Issue 6 Pages
840-846
Published: May 20, 2000
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The image registration of functional single photon emission computed tomography (SPECT) and morphological (x-ray CT / MRI) images was studied in order to improve the accuracy and quantity of imaging diagnosis. We have developed a new frameless registration method for x-ray CT and SPECT images using transmission CT images acquired for the absorption correction of SPECT images. This is an automated registration method that calculates the transformation matrix between the two coordinate systems of image data by the optimization method. This registration method is based on the similar physical properties of x-ray CT and transmission CT images and can be applied to the chest and abdomen as well as the head. The three-dimensional overlap of bone or body regions is used for image matching. An application study using three sets of patient data suggested that registration accuracy was acceptable for clinical use. The fused images of x-ray CT and SPECT after registration indicated the possibility of improving imaging diagnosis and medical treatment.
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AKIO OGURA, MITSUJI HIGASHIDA, MASARU YAMAZAKI, HIROSHI INOUE, AKIHIRO ...
Article type: Article
2000 Volume 56 Issue 6 Pages
847-853
Published: May 20, 2000
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To evaluate the performance of clinical magnetic resonance imaging systems, standard test procedures have been recommended by the NEMA, AAPM task group, EEC concerted research project, and others. The purpose of these standard tests is to determine system performance specifications, reference procedures for test acceptance, and periodic examination of quality control. However, the recommended measurements are very complicated when used for periodic quality control checks or comparisons with other systems. Therefore, we determined new standard test procedures that serve these purposes. Eleven clinical MRI systems in nine clinical facilities were evaluated using these new standard test sets. Results indicated that the measurement time was too short using the new test sets. However, through comparison with various MRI systems, the specificity of each system could be determined.
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Article type: Appendix
2000 Volume 56 Issue 6 Pages
854-855
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Article type: Appendix
2000 Volume 56 Issue 6 Pages
856-859
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Article type: Appendix
2000 Volume 56 Issue 6 Pages
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2000 Volume 56 Issue 6 Pages
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2000 Volume 56 Issue 6 Pages
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Article type: Appendix
2000 Volume 56 Issue 6 Pages
862-865
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2000 Volume 56 Issue 6 Pages
866-869
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Article type: Appendix
2000 Volume 56 Issue 6 Pages
870-871
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Article type: Cover
2000 Volume 56 Issue 6 Pages
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