-
Article type: Cover
1999 Volume 55 Issue 8 Pages
Cover27-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1999 Volume 55 Issue 8 Pages
Cover28-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
1999 Volume 55 Issue 8 Pages
Toc21-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
1999 Volume 55 Issue 8 Pages
Toc22-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1999 Volume 55 Issue 8 Pages
I-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
II-IV
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
V-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
VI-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
VI-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
VII-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
VII-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
VIII-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
VIII-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
IX-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
IX-X
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
XI-XII
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
XIII-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
XIV-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1999 Volume 55 Issue 8 Pages
735-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
SHINICHI YAMADA
Article type: Article
1999 Volume 55 Issue 8 Pages
735-738
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
TATSUYA YAMAZAKI
Article type: Article
1999 Volume 55 Issue 8 Pages
738-742
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
YOICHI HATANAKA
Article type: Article
1999 Volume 55 Issue 8 Pages
742-744
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Kevin Hobert
Article type: Article
1999 Volume 55 Issue 8 Pages
744-751
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
TSUKASA DOI
Article type: Article
1999 Volume 55 Issue 8 Pages
752-758
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
FUJIMI KINOSHITA
Article type: Article
1999 Volume 55 Issue 8 Pages
759-761
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
MASAHIKO MONMA
Article type: Article
1999 Volume 55 Issue 8 Pages
762-765
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
TAKEYUKI HASHIMOTO
Article type: Article
1999 Volume 55 Issue 8 Pages
766-769
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
YUJI NOGUCHI, [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1999 Volume 55 Issue 8 Pages
770-771
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
SADAMITSU NISHIHARA, HIROMI NAGANO, KEN-ICHI YOSHIDA, AKIYOSHI OTSUKA, ...
Article type: Article
1999 Volume 55 Issue 8 Pages
773-777
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
Gradients of characteristic curves were investigated according to the change in front-to-back light-emission ratio (1/0.7 to 1/5.3) for intensifying screens combined with double-coated x-ray film with various crossover fractions. Average gradients were measured from the characteristic curves, and the crossover fraction for each film was also calculated. Results showed that the greater the front-to-back light-emission ratio of the screen, the lower the average gradient in all cases. A linear relationship was also found between average gradient and crossover fraction.
View full abstract
-
YOSHIMASA MIZUNO, TSUKASA DOI, KATSUYA KOKUBO, AKIHIKO NOGI, NOBUHIRO ...
Article type: Article
1999 Volume 55 Issue 8 Pages
778-782
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
We evaluated low contrast resolution in CT images from various apparatuses by using the second recommendation of the x-ray CT commission. This method is based on visual assessment by an observer using a CT performance evaluation phantom. We evaluated CT images with low contrast resolution using the contrast-to-noise ratio (CNR) in terms of quantity of data, region of interest (ROI) size, and the relation between the second recommendation and CNR, and compared various kinds of machines according to CNR. We found that this method had certain factors that influenced the precision of measurement. However, there was a correlation between CNR and visual evaluation, and we were able to evaluate low contrast resolution in each apparatus. This method was considered a useful step, because low contrast resolution could be easily evaluated.
View full abstract
-
KATSUHIKO HIROTA, SHOUJI OKUI, AKIO KOMATSU
Article type: Article
1999 Volume 55 Issue 8 Pages
783-788
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
In contrast-enhanced CT, many kinds of contrast media are administered with an automatically controlled syringe injector whose needle is retained in a peripheral vessel. In such cases, damage to the injection syringe caused by intratube pressure and/or jet flow from the needle may result in injury and pain at the injection site of the vessel. Thus, stable injection including the needle tip is essential. To improve the reliability of injections and to ensure the safety of patients, we evaluated three factors, syringe materials, needles, and contrast media, by measuring intratube pressure. Frictional resistance of the syringe was also evaluated as it relates to syringe configuration. We found that the intratube pressure increased in proportion to the density and viscosity of each contrast medium. However, it was revealed that the pressure itself fluctuated according to the material and configuration of each syringe container. Glass syringes showed less intratube pressure and a stable injection rate, leading to more favorable results than nylon syringes. Further, intratube pressure was reduced by replacing the "winged-type" steel needle (21 G) with a "surflow-type" nylon needle (22 G) having the same internal diameter at the injection rate of 3 ml/sec.
View full abstract
-
TOMIO IRIKAWA, SUTEO TANAKA, MASAMI ISOMI, TAKESHI YONEDA, HARUICHI YA ...
Article type: Article
1999 Volume 55 Issue 8 Pages
789-795
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
The use of a shell has made it unnecessary to mark the skin in radiation therapy for head and neck cancers. However, a serious problem is that secondary electrons from the shell frequently cause radiation dermatitis. The increase in surface dose is a major problem in using a shell, and several trials have been carried out to overcome this problem. In this study, the result of measurement with 6 MV x-rays demonstrated that the use of a shell caused the surface dose to increase 2.9 times in a 5×5 cm^2 field and 2.3 times in a 10×10 cm^2 field. With a pair of lateral opposed fields for neck cancers, the angle of incidence was approximately 45 degrees. In a comparison of the perpendicular incidence of an open field and 45-degree incidence of a shell field, it was found that the surface dose increased 3.6 times in the 5×5 cm^2 field and 2.9 times in the 10×10cm^2 field. Considering patients' quality of life, we decided to remove the shell from the radiation field and also not to mark the skin, and devised a new method of precutting the shell and developed supplemental equipment. The result of measurement of the shell with our supplemental devices suggested that it would be useful in decreasing surface dose in patients with head and neck cancers.
View full abstract
-
AKIO OGURA, TATSUYA NAKAGAWA, KATSUNORI KUWABARA, HIDEHARU NIIDA, SHIN ...
Article type: Article
1999 Volume 55 Issue 8 Pages
796-800
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
Liver scintigraphy using technetium-99m-labeled galactosyl human serum albumin has various indices of reserve hepatic function, including LHL15 and HH15. However, these indices are subject inter-operator variation due to subjective determination of regions of interest (ROI) for the heart and liver. Therefore, the method of using an averaged ROI signal instead of an added signal was examined. The imaging data of twenty patients were evaluated by five operators using three methods: LHL15, calculated by using an added signal in ROIs of heart and liver; LHLcm15, calculated using an averaged signal in the ROIs; and LHLcm15, calculated using an averaged signal in the small circle ROI in the heart and the ROI of the liver. Inter-operator variation and the correlation with ICGR 15 and with visual evaluation were evaluated for the three methods. The results indicated that the methods using averaged signal (LHLm15, LHLcm15) have little inter-operator variation and have a linear correlation with other methods of determining hepatic function like ICGR 15 and visual evaluation.
View full abstract
-
Article type: Bibliography
1999 Volume 55 Issue 8 Pages
801-802
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
803-804
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
805-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
806-807
Published: August 20, 1999
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
1999 Volume 55 Issue 8 Pages
808-809
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
App10-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
App11-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
App12-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1999 Volume 55 Issue 8 Pages
App13-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1999 Volume 55 Issue 8 Pages
Cover29-
Published: August 20, 1999
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS