-
Article type: Cover
2001 Volume 57 Issue 8 Pages
Cover27-
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
2001 Volume 57 Issue 8 Pages
Cover28-
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
2001 Volume 57 Issue 8 Pages
Toc21-
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
2001 Volume 57 Issue 8 Pages
Toc22-
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
2001 Volume 57 Issue 8 Pages
I-
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 8 Pages
II-XIV
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
YUUKI NUKAGA, [in Japanese], [in Japanese], [in Japanese], [in Japanes ...
Article type: Article
2001 Volume 57 Issue 8 Pages
883-890
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Hiroshi Iseki, Kyojiro Nambu
Article type: Article
2001 Volume 57 Issue 8 Pages
891-895
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Masaharu Yoshikawa, Hideyuki Kato, Hideo Umekita, Kouichi Miyahara, Fu ...
Article type: Article
2001 Volume 57 Issue 8 Pages
896-900
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
YOSHIE KODERA
Article type: Article
2001 Volume 57 Issue 8 Pages
901-903
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
AKIHIKO NISHIJIMA
Article type: Article
2001 Volume 57 Issue 8 Pages
904-905
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
SHINSUKE TSUKAGOSHI
Article type: Article
2001 Volume 57 Issue 8 Pages
906-907
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
NOBUHIRO YOSHIDA
Article type: Article
2001 Volume 57 Issue 8 Pages
908-909
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
TOSHIO ITO
Article type: Article
2001 Volume 57 Issue 8 Pages
910-912
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
TAKESHI MURAKAMI
Article type: Article
2001 Volume 57 Issue 8 Pages
913-919
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
TOSHIFUMI SAKAKIHARA
Article type: Article
2001 Volume 57 Issue 8 Pages
920-922
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
2001 Volume 57 Issue 8 Pages
923-924
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
KEIJI FUJIMOTO, NOBUHIRO ODA, HAJIME NAKATA, SEIICHI MURAKAMI, ETSUROU ...
Article type: Article
2001 Volume 57 Issue 8 Pages
925-932
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
We investigated the effect of image ata compression on temporal subtraction images in chest computed radiography (CR). Subtraction images were obtained from current and previous CR chest images which were represented by either original data or 1/20 lossy compression data. One hundred clinical cases were employed in this study. The visual evaluation and histogram analysis indicated that the lossy compression did not affect the image quality in lung fields of the subtraction image. However, the standard deviation of pixel values in the mediastinum of the subtraction image obtained from compressed images was decreased probably becouse of smoothing in the image compression process. Therefore, we conclude that the use of compressed chest CR image data is suitable for temporal subtraction images.
View full abstract
-
AKIO OGURA, AKIHIRO ISHIKURO, TETSUYA KIMURA, HIROSHI INOUE
Article type: Article
2001 Volume 57 Issue 8 Pages
933-938
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
The fast spin echo (SFE) technique has recently been used for routine MRI clinical studies because FSE images show contrast for most tissues similar to that of conventional SE images in a much reduced imaging time. There are, however, important differences in contrast in certain tissues;for example, fat has higher signal intensity on FSE images than on conventional SE images, often creating problems in clinical diagnosis. The difference is affected by j-coupling and the magnetization transfer effect. The purpose of this study was to assess whether FSE scanning parameters [echo train length (ETL), echo spacing, multi-slicing, and radiofrequency refocusing pulse angle] are affected by j-coupling and the magnetization transfer effect. Effective T_1 and T_2 relaxation times for various contrast phantoms were measured under different scanning parameters. The results demonstrated that increased ETL and decreased echo spacing affected both j-coupling and the magnetization transfer effect, while using multi-slicing affected the magnetization transfer effect. The radiofrequency refocusing pulse angle showed no effect.
View full abstract
-
HIDEAKI OKAMOTO, MASAYOSHI MIYAZAKI, AKITOSHI YONEDA, KEIICHI SUZUKI, ...
Article type: Article
2001 Volume 57 Issue 8 Pages
939-946
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
We perform lung cancer screening computed tomography (LSCT) with helical CT using 30 cm for males and 26 cm for females as the standard conditions of the scan range. We discuss the differences in tissue dose, organ dose, and effective dose according to these scan ranges. We discuss the differences in tissue dose, organ dose, and effective dose according to these scan ranges. We compared tissue dose, organ dose, and effective dose among LSCT and conventional lung cancer screening using chest radiography and chest fluorography. Scanning parameters were 120 kV, 25 mA, 10 mm slice thickness, and 20 mm/2 sec/rotation. The effective doses were 1.40 mSv for males and 1.15 mSv for females for LSCT, 0.02 mSv for chest radiography, and 0.07 mSv for chest fluorography. When the scan range was expanded from 26 cm to 30 cm on LSCT, the absorbed doses of the abdomen and bone marrow, and the effective doses increased because the scan range covered organs of the abdomen including liver, stomach, lumbar vertebrae, lower ribs, and thoracic vertebrae. Therefore, we propose that it is necessary to interrupt the x-rays at precisely the time that the scan reaches the bottom of the lung in order to reduce the effective dose.
View full abstract
-
HIROSHI AKAZAWA, KENJI YAMAMOTO
Article type: Article
2001 Volume 57 Issue 8 Pages
947-952
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
The fracture of the calcaneus frequently involves the surface of the posterior talocalcaneal joint. Therefore, the Anthonsen position, which is effective for visualizing the posterior talocalcaneal joint surface, should always be indicated in patients suspected of fracture of the calcaneus. The Anthonsen I position, however, requires x-ray irradiation at an angle of 25° in the head and caudal directions and at 30° in the dorsoventral direction, which frequently results in the need for repeated x-ray examinations due to orientation errors. An alternative approach is to conduct x-ray examination using a tilting table adjusted to an angle of 25° or to carry out x-ray examination at a position of 45° heel lift. The adoption of these techniques enables relatively unconstrained visualization of the talocalcaneal joint, although x-ray examination in the heel lifting position may cause stress to patients suffering post-traumatic pain. The reproducibility of post-traumatic, preoperative and postoperative projections, however, is poor. As a solution to these problems, we have developed a new x-ray examination technique. The incident x-ray angle has been simplified by synthesizing the two angles used with the Anthonsen I position. Furthermore, the position of the foot is determined by means of an auxiliary projection device. Our simplified version of the Anthonsen I position reduces the number of projection processes and does not require the patient to adopt an awkward position. In addition, this modified technique enables the visualization of the posterior talocalcaneal joint surface as clearly as with conventional x-ray examination.
View full abstract
-
OSAMU WAKAMATSU, TATSUO FUKUCHI, HIROYUKI SEKIGUCHI, KOUICHI SUGIYAMA, ...
Article type: Article
2001 Volume 57 Issue 8 Pages
953-962
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
Every five years, the Japanese Society of Circulation Imaging Technology implements a questionnaire investigation that covers the entire country. A total of 1,020 facilities throughout Japan where cardiac catheterization can be performed were investigated. The questionnaire response rate was 47.7%. The main points of investigation were actual status, image management, photographic conditions, cinefilm development processing, and exposure protection, among others. Correlations were found between the number of beds in the facility and the number of examinations done and the number of radiological technologists employed. We also obtained information concerning the staff engaged in examinations. It was also possible to obtain information regarding the contents of the examinations implemented throughout country, the actual status of IVR, and the number of examinations carried out. Questions regarding picture management revealed that digital imaging and networking were becoming more widespread. In the area of exposure protection, it was found that staff exposure was higher than expected. It is necessary to improve exposure protection in vascular examinations for IVR.
View full abstract
-
TSUGUNORI IWAI, MASARU NITTA, YASUO NAKAZAWA
Article type: Article
2001 Volume 57 Issue 8 Pages
963-968
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
At Showa University Hospital, a film management system to keep track of the whereabouts of the main film jacket and history of each examination was deployed when our new hospital came into operation in May 1997. Our radiology information system was linked with the hospital information system, and patient information was shared and transmitted. By introducing the file management system, the alibi of the film jacket and details of the procedure could be grasped in real time, reducing the search time for the main film jacket. Especially in our radiology department, the input of information to the file management system and searching the database can be done from location, resulting in prompt responses to inquiries from ordering physicians. Bar-code input, simultaneous processing, and the generation of stickers for film management has led to more efficient system operation.
View full abstract
-
Article type: Appendix
2001 Volume 57 Issue 8 Pages
969-972
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 8 Pages
973-
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 8 Pages
973-
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 8 Pages
973-
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 8 Pages
974-
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 8 Pages
975-978
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2001 Volume 57 Issue 8 Pages
979-980
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
RESTRICTED ACCESS
To protect personal information, PDF files cannot be viewed.
View full abstract
-
Article type: Appendix
2001 Volume 57 Issue 8 Pages
981-982
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
RESTRICTED ACCESS
To protect personal information, PDF files cannot be viewed.
View full abstract
-
Article type: Appendix
2001 Volume 57 Issue 8 Pages
983-984
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
2001 Volume 57 Issue 8 Pages
Cover29-
Published: August 20, 2001
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS