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Article type: Cover
2004 Volume 60 Issue 10 Pages
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Article type: Cover
2004 Volume 60 Issue 10 Pages
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Article type: Index
2004 Volume 60 Issue 10 Pages
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Article type: Index
2004 Volume 60 Issue 10 Pages
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[in Japanese]
Article type: Article
2004 Volume 60 Issue 10 Pages
I-
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
II-IV
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
V-VII
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
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2004 Volume 60 Issue 10 Pages
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
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Shuichi Higano, Hajime Tamura, Shunji Mugikura, Atsushi Umetsu, Shoki ...
Article type: Article
2004 Volume 60 Issue 10 Pages
1351-1360
Published: October 20, 2004
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NAOHIRO KIMURA, [in Japanese]
Article type: Article
2004 Volume 60 Issue 10 Pages
1361-1368
Published: October 20, 2004
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YUTAKA AOYAMA
Article type: Article
2004 Volume 60 Issue 10 Pages
1369-1373
Published: October 20, 2004
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SATOSHI OKUGAWA
Article type: Article
2004 Volume 60 Issue 10 Pages
1374-1384
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SHIGEHIKO KATSURAGAWA
Article type: Article
2004 Volume 60 Issue 10 Pages
1385-1388
Published: October 20, 2004
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HIROSHI OGUCHI
Article type: Article
2004 Volume 60 Issue 10 Pages
1389-1404
Published: October 20, 2004
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TADASHI SUNAYASHIKI, [in Japanese], [in Japanese], [in Japanese], [in ...
Article type: Article
2004 Volume 60 Issue 10 Pages
1405-1407
Published: October 20, 2004
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HIROKO NISHIDE
Article type: Article
2004 Volume 60 Issue 10 Pages
1408-1409
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SATOSHI OHNO
Article type: Article
2004 Volume 60 Issue 10 Pages
1410-1413
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HISATERU OHBA, KATSUHIKO OGASAWARA, TAMIO ABURANO
Article type: Article
2004 Volume 60 Issue 10 Pages
1415-1423
Published: October 20, 2004
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We carried out a questionnaire survey of all radiological technology schools, to investigate the status of radiation safety education. The questionnaire consisted of questions concerning full-time teachers, measures being taken for the Radiation Protection Supervisor Qualifying Examination, equipment available for radiation safety education, radiation safety education for other departments, curriculum of radiation safety education, and related problems. The returned questionnaires were analyzed according to different groups categorized by form of education and type of establishment. The overall response rate was 55%, and there were statistically significant differences in the response rates among the different forms of education. No statistically significant differences were found in the items relating to full-time teachers, measures for Radiation Protection Supervisor Qualifying Examination, and radiation safety education for other departments, either for the form of education or type of establishment. Queries on the equipment used for radiation safety education revealed a statistically significant difference in unsealed radioisotope institutes among the forms of education. In terms of curriculum, the percentage of radiological technology schools which dealt with neither the shielding calculation method for radiation facilities nor with the control of medical waste was found to be approximately 10%. Other educational problems that were indicated included shortages of full-time teachers and equipment for radiation safety education. In the future, in order to improve radiation safety education at radiological technology schools, we consider it necessary to develop unsealed radioisotope institutes, to appoint more full-time teachers, and to educate students about risk communication.
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KATSUROU OHTA, YOSHIYUKI TAKEUCHI, MITSUHIRO TOZAKI, TETSUYA IIDA, TAK ...
Article type: Article
2004 Volume 60 Issue 10 Pages
1424-1428
Published: October 20, 2004
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The aim of this study was to evaluate the clinical usefulness of image fusion of lymphoscintigraphy with ^<99m>Tc phytate and volume-rendering images generated by multidetector-row CT(MDCT) in patients with breast cancer. The subjects were 25 patients with clinically negative nodes. Data from the two imaging modalities were fused on a personal computer. Thirty-five axillary sentinel nodes were identified by lymphoscintigraphy. The anatomical locations of sentinel nodes in 27 patients were clearly demonstrated by 3D-fusion imaging(84%). Image fusion of lymphoscintigraphy with ^<99m>Tc phytate and volume-rendering images is helpful for sentinel node biopsy in breast cancer.
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KIYOYUKI KODAMA, MINORU HAMADA, TAMOTSU SUZUKI, MASATOSHI HASHIMOTO, T ...
Article type: Article
2004 Volume 60 Issue 10 Pages
1429-1436
Published: October 20, 2004
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We proposed a new method of performance evaluation for X-ray CT using visible scintillation light and examined its usefulness in this study. When we scanned a plastic scintillator disk in a gantry opening of the X-ray CT, we could observe visible scintillation light. The rotation of the light-emitting area of the disk corresponded to that of the X-ray tube. We were able to record the scintillation light by digital video camera. By analyzing the area of visible scintillation light, the rotation speed of the X-ray tube, angular spread of the X-ray beam, uniformity of the incident X-rays, and change in X-ray energy were measured. No other method is available to obtain the above parameters of X-ray CT during a single CT scan. In the measurements of the uniformity of incident X-rays and change of X-ray energy, our method showed good accuracy in detecting the attenuation caused by the couch between the X-ray tube and the plastic scintillator disc. The proposed method is inexpensive and easy-to-use. We conclude that the method is a useful tool for performance evaluation as well as a maintenance tool for X-ray CT.
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HIDEMICHI KAWATA, HIROSHI NISHIMURA, SYUJI NAGATA, TSUYOSHI MATSUDA, K ...
Article type: Article
2004 Volume 60 Issue 10 Pages
1437-1443
Published: October 20, 2004
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Magnetization transfer contrast (MTC) was evaluated by changing the off-set frequency and pulse intensity of MTC with the spoiled gradient echo (SPGR) sequence (T2^*-weighted image) using an experimental phantom that included olive oil, protein, fiber, collagen, and pure water. The intensity of pure water reached a constant level just above the off-set frequency (1200 Hz)regardless of MT pulse power. The contrast-to-noise ratio(CNR)in each of the phantom materials was maximal at the MT pulse power of 2500 degrees (equivalent flip angle). The CNR and image noise obtained by body coil were inferior to those obtained with an extremity coil. In clinical application, the MTC effect on chondrosarcoma was higher(MT ratio, ROI-1:0.448, ROI-2:0.382)than those of other cases in this study. Since the image contrast was improved between the malignant fibrous histiocytoma(MFH, MT ratio, ROI-1:0.282, ROI-2:0.289)and peripheral tissues, extraskeletal extension could be observed more easily than without MTC imaging. In conclusion, the effects of MTC might be in providing useful information, in presuming composed tissues, differential diagnoses, and extent to the surrounding structures because of changing the image contrast to surrounding tissues corresponding to the rate of included bound water.
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YUKI MIYABE, SHINSUKE YANO, TAKASHI OKADA, MANABU NAKATA, TERUKI TESHI ...
Article type: Article
2004 Volume 60 Issue 10 Pages
1444-1451
Published: October 20, 2004
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In fractionated stereotactic radiotherapy(SRT), the accuracy of patient relocation is very important. The Gill-Thomas-Cosman (GTC)re-locatable stereotactic frame is used for patient immobilization. A depth helmet and measuring probe are used to check the stability of the patient's head position relative to the GTC frame. However, displacement error caused by rotation of the patient's head is not considered in the depthhelmet measurement. Consequently, displacement of the isocenter position cannot be confirmed by the measurement obtained from the depth helmet. In this study, we evaluated the precision of reproducibility by comparing measurement values of the depth helmet with the displacement of anatomical position on a CT image. We analyzed 21 setups of 8 patients immobilized for SRT using the GTC frame, between June 2001 and June 2003. The reproducibility of the GTC frame was checked at each treatment by comparing it with the treatment planning position. The average discrepancy of the GTC frame set-up measured by the depth helmet was 0.6 mm, with a standard deviation of 0.3 mm. The result measured by CT was 0.7 mm, with a standard deviation of 0.4 mm. When the error of each measurement point was within 1.0 mm, the accuracy of relocation of the patient could be considered clinically acceptable. Displacement error not considered in the measurement of the depth helmet could be evaluated by using CT.
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YOSHIHIKO HOSHINO, HITOSHI IGARASHI, TAKAYUKI SUTOU, HIROMITSU HIGUCHI ...
Article type: Article
2004 Volume 60 Issue 10 Pages
1452-1458
Published: October 20, 2004
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The semi-axial-view method is used to measure humeral retroversion angles by a single x-ray exposure. We examined the clinical utility of this method using a humerus model and normal volunteers. In an experiment with a humerus model, humeral retroversion angles were measured at various positioning angles by the semi-axial-view method, and compared with the angles measured by the CT method, which is considered the standard, and the best position was determined. The upper arms of three volunteers were photographed by the semi-axial-view method in the most suitable position, and humeral retroversion angles were compared with those obtained by the CT method. As a result of examination with a humerus model, the best positioning angles were 20 degrees of shoulder abduction angle, 90 degrees of shoulder flexion angle, and 90 degrees of elbow flexion angle. There were no significant differences between the humeral retroversion angles of the CT and semi-axial-view methods with the best position determined in volunteers. In conclusion, the semi-axial-view method is a useful, easy method for measuring the humeral retroversion angle. This method will be a great asset in researching large numbers of samples.
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CHULL MA SANG, KUN KONG YOUNG, MAN AHN YOUNG, JUNG PARK KI
Article type: Article
2004 Volume 60 Issue 10 Pages
1459-1466
Published: October 20, 2004
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The objective of this research was to synthesize a thyroid phantom with ultrasound properties similar to those of tissue-mimicking materials (TMM). This was done so that an ultrasound thyroid-training phantom could be developed. A polymer urethane TMM was made by using the following materials: C, CCR, TiO_2, silver, tungsten, and graphite, in the hope that it would have the same properties as soft tissue. To confirm this similarity, several tests were undertaken, including penetration, gray scale, propagated speed, and attenuation back comparison. The results of this study were as follows: (1)The propagated speed of C, CCR, and graphite-type TMM were 1,460-1,580 m/s. Attenuation was 0.5-0.7 dB/cm/MHz, and a homogeneous echo pattern similar to that of thyroid gland was noted. (2)The TiO_2 TMM seemed similar to that of thyroid even in low echo. The surrounding area also showed similar patterns. (3)The silver TMM showed an echo pattern similar to that of prostate. (4)The tungsten TMM showed a visible heterogeneous echo pattern. (5)The C-type TMM was compared with human thyroid and also tested via ultrasound imaging. It is hoped that this research will be useful in the future in ultrasonography training and in providing a better thyroid-training phantom and phantoms of other organs.
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
1467-1468
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
1472-1474
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
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Article type: Appendix
2004 Volume 60 Issue 10 Pages
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2004 Volume 60 Issue 10 Pages
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Article type: Cover
2004 Volume 60 Issue 10 Pages
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