-
Article type: Cover
1993 Volume 49 Issue 4 Pages
Cover13-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
1993 Volume 49 Issue 4 Pages
Toc13-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
1993 Volume 49 Issue 4 Pages
Toc14-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1993 Volume 49 Issue 4 Pages
i-xiii
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1993 Volume 49 Issue 4 Pages
xiv-xviii
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
KAZUMI KANAI, AKIYOSHI OHTSUKA, MASAHIRO HASHIDA, SHUICHI YAMAUCHI, KA ...
Article type: Article
1993 Volume 49 Issue 4 Pages
570-575
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
In computed radiography, the optical density of images does not depend on the exposure conditions. Therefore, the same density image is obtained even if the anti-scatter grid ratio is changed. In this case, the more scattered X-rays are removed, the incident dose to the detector decreases. Conversely, the more scattered X-rays increase, then the incident dose increases. We investigated the visual detection of simulated low-contrast object changing incident dose related to quantum noise, scatter fraction related to radiographic contrast and contrast enhancement. This means that visual detectability is more seriously affected by such factors as incident dose, scatter fraction or contrast enhancement. The results indicate that when the incident dose to the detector is almost equivalent to the medium-speed screen-film system, the lower scattered X-rays are more visually detectable. However, when the incident dose is less than that of the high-speed screen-film system, the removal of too much scattered X-rays results in less visual detection. This shows that if the incident dose is too low, it is better not to remove almost all of the scattered X-rays. Contrast enhanced effect is greater in a larger incident dose than in a smaller one.
View full abstract
-
Article type: Bibliography
1993 Volume 49 Issue 4 Pages
575-599
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
RYUJI KANZAKI, AKIYOSHI OHTSUKA, AKIO OKAYAMA, MASAHIRO HASHIDA, SYUIC ...
Article type: Article
1993 Volume 49 Issue 4 Pages
576-581
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
Aluminum and copper are widely used as materials in compensating filters in lung hilars tomography. However, using these materials causes a problem : the lung image contrast decreases because of increasing X-ray energy. In this study, gadolinium which has a K-absorption edge of 50 keV was used for preventing the decrease in lung image contrast. In this study, the compensating filter is made of a commercial gadolinium screen. The effective X-ray energy transmitted through a gadolinium filter is about 18 keV which is lower than that transmitted through aluminum at a tube voltage of 100kV. We investigated the differences in the image contrast caused by the difference of the effective energy. As a result, the radiographic contrast between a 5 mm aluminum plate and 10 cm acryl plate when the X-ray beam is transmitted through a gadolinium filter is approximately 0.2 optical density units higher than when it is transmitted through an aluminum filter. Also, it appears that the image contrast of the lung is better on clinical film. Thus, using a gadolinium filter has some advantages : the decrease in the image contrast of the lung can be minimized, it is easy to make the compensating filter, and the filter is not heavy.
View full abstract
-
HAJIME FURUKAWA
Article type: Article
1993 Volume 49 Issue 4 Pages
582-587
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
It is said that the blue tone of orthochromatic film for rapid processing is stronger than before. We examined the type of fluorescent lamp used to change the degree of coloring of blue for such film when it is applied to the viewing box. With regard to the characteristics of the fluorescent lamp, we examined two parameters : a general color rendering index and color temperature. When the general color rendering index rises to a fixed color temperature, the tone of blue becomes stronger. Blue changes to the strongest tone under standard source C, which also applies to the color temperature as well. Namely, when the color temperature rises to a fixed general color rendering index, the tone of blue becomes stronger.
View full abstract
-
KOHSAKU NISHIGUCHI, KENKICHI MIYAHARA, ATSUNORI OKADA, TOSHIYA KAMIMUR ...
Article type: Article
1993 Volume 49 Issue 4 Pages
588-593
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
Ioxilan, a new non-ionic contrast medium, was evaluated quantitatively for its diagnostic capability by means of densitometry. As a result, Ioxilan was revealed to be a very useful contrast material, which showed no significant difference in its roentogenologic contrast ratio, compared with Iopamidol and Iohexol. The evaluation for diagnostic capability of a contrast medium by densitometory is more quantitative and objective in comparison with visual judgement. Therefore, this method should be further evaluated regarding the diagnostic capability of the contrast media.
View full abstract
-
TOSHIZO KATSUDA, TADASHI NAKAJIMA, TADAO KUWANO, KOUKI UEDA, YASUHIRO ...
Article type: Article
1993 Volume 49 Issue 4 Pages
594-599
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
It is empirically said that the application of the compensating filter leads to a decrease in the exposure dose of the filter-inserted area and an increase in that of the otherwise area. Using the area-dosimeter, comparison was made of exposure doses by the application of the above filter and the otherwise filter in head simple X-P, abdominal angiography and lower extremity X-P. Using the filter for head simple X-P and Mix-Dp phantom, measurement was made of the absorbed dose at the 5 cm-depth to compare the rate of decrease in absorbed dose between the above both areas. Head simple X-P gained a decrease in area dose of 29%. The absorbed dose at the 5 cm-depth in the phantom experiment showed a decrease of over 26% at the filter-inserted area, but little increase at the otherwise area. The above results indicated the interposition of the filter between the X-ray tube and the object to lead to decreases not only in the area dose but also in the patient's exposure dose.
View full abstract
-
YOSHIYUKI UMEZU, KAZUHISA OGAWA, JUNICHI TANAKA, TADASHI KAWAIDA, EISY ...
Article type: Article
1993 Volume 49 Issue 4 Pages
600-606
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
The trial study of clinical application of the large field digital subtraction angiography (CR-DSA) was performed on the patients, who have vascular diseases ranging from the abdomen to the lower extremities, with the combination of a cassette changer for large field radiography and computed radiography. Despite several studies on DSA of CR and on the need of a large field DSA have already been reported in the past, there were none studies on the comparison between CR-DSA and other methods nor on the radiographic programming nor on the solving method for excessively long processing time inherent to CR. Therefore, focusing on those above points, the clinical availability of large field CR-DSA was investigated. It was founed that the depicting ability of vasculars of CR-DSA was comparable or superior to that of digital fluorography and to the conventional S/F method, moreover anatomically continuative structure of vascular image of DSA from the abdomen to the lower extremities was obtained. The problem remaning has a very long processing time typically inherent to CR. The clinical application test was found to be excellent and this system is expected to be used for routine examination.
View full abstract
-
HIROHUMI MATSUURA
Article type: Article
1993 Volume 49 Issue 4 Pages
607-610
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
YOSHIHIKO KAWAMURA
Article type: Article
1993 Volume 49 Issue 4 Pages
611-615
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
YUUJI KUME
Article type: Article
1993 Volume 49 Issue 4 Pages
616-619
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
KANAME MAEDA
Article type: Article
1993 Volume 49 Issue 4 Pages
619-623
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
KAZUYA YAMASHITA
Article type: Article
1993 Volume 49 Issue 4 Pages
623-627
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
YOSHIE KODERA
Article type: Article
1993 Volume 49 Issue 4 Pages
627-629
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
HIROYUKI KOMURO
Article type: Article
1993 Volume 49 Issue 4 Pages
630-638
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
We made projection images using volume rendering method by extraction of certain specified CT number group in 3D-CT data. Every image had noteworthy characteristics and were useful for diagnosis. In that process, operator could select and CT number group at his will, and enphasize that on images with remaining informations of other CT-number area. This operator-oriented system had greater advantage for effective usage of large amount infomations. In conclusion projection image of organs using volume rendering method gave us unique and useful information for radiological diagnosis and have greater possibility of further clinical application.
View full abstract
-
Article type: Appendix
1993 Volume 49 Issue 4 Pages
639-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1993 Volume 49 Issue 4 Pages
639-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1993 Volume 49 Issue 4 Pages
639-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1993 Volume 49 Issue 4 Pages
639-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese]
Article type: Article
1993 Volume 49 Issue 4 Pages
639-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
639-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese]
Article type: Article
1993 Volume 49 Issue 4 Pages
639-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
639-640
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1993 Volume 49 Issue 4 Pages
640-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1993 Volume 49 Issue 4 Pages
640-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1993 Volume 49 Issue 4 Pages
640-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
640-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
640-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
640-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1993 Volume 49 Issue 4 Pages
640-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
640-641
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1993 Volume 49 Issue 4 Pages
641-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1993 Volume 49 Issue 4 Pages
641-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
641-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
641-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
641-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
641-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
641-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1993 Volume 49 Issue 4 Pages
641-642
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
642-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
642-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
642-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1993 Volume 49 Issue 4 Pages
642-643
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
643-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
643-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1993 Volume 49 Issue 4 Pages
643-
Published: April 01, 1993
Released on J-STAGE: June 29, 2017
JOURNAL
FREE ACCESS