-
Article type: Cover
1986 Volume 42 Issue 5 Pages
Cover13-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1986 Volume 42 Issue 5 Pages
Cover14-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
1986 Volume 42 Issue 5 Pages
Toc5-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1986 Volume 42 Issue 5 Pages
App11-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1986 Volume 42 Issue 5 Pages
App12-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
OSAMU NAKAMURA, SABURO AKIYAMA, YOSHITOMO SANO, GUIO UCHIYAMA
Article type: Article
1986 Volume 42 Issue 5 Pages
612-619
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
Making use of the contrast and spatial resolution of X-ray CT (GE CT/T 8800), the weight (volume) of the thyroid gland was estimated. To decide the margin of the thyroid gland in CT images, a study was performed using 5 phantoms having different kinds of contrast ratios to the background. The weight of an in-house thyroid phantom was measured using a prepared program Volume, and the correction coefficient was calculated. The clinical data obtained by this method were compared with an another method for estimating the weight of the thyroid gland which is used for the radioisotope treatment of the hyperthyroidism. As a result, the values due to the CT program correlated well with those obtained with the use of the empirical formulae. The CT program was superior to the method of the empirical formulae in the patients with thyroid glands smaller than 18 grams.For estimating the weight of the thyroid galnds, the X-ray CT method was more accurate than theradioisot scan method and was more suitable for does calculation in the treatment of hyperthyroid patients.
View full abstract
-
TOSHINORI KOMBA, EIJI MOGI
Article type: Article
1986 Volume 42 Issue 5 Pages
620-627
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
With the increase use of bedside radiography, hospitals have been suffering from various problems centered around it use, especially a limited number of cassettes storage boxes in the mobile X-ray units. In an effort to solve this problem, we have developed a single-size film changer-compact, lightweight and easy to operate-that can be mounted on mobile X-ray equipment for bedside radiography. The film changer uses the cassette with roll closing mechanism. To allow unexposed film to be inserted into the cassette more effectively, the film changer is so designed that the film is lifted from the downward positioned film supply magazine and is inserted forcibly into the cassette. This design is based upon the cassette's roll closing mechanism that hangs film. No rollers are employed at all. This prevents the film from being inserted obliquely into the cassette, as well as solves other problems such as film becoming dirty and a build up of static electricity.Just as the film transfer is in the vertical position, the film feeder is also is in the vertical position. Therefore, film removal is based on the horizontal and vertical movement of the film pickup.This system allows film to be removed very smoothly from the magazine because there is a suitable amount of air between the filmlayers.
View full abstract
-
KENICHI OGAWA, HIROKI NOHARA, YUTAKA YUKAWA, TAKASHI OKADA
Article type: Article
1986 Volume 42 Issue 5 Pages
628-633
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
The purpose of this study is to determine calculation accuracies of inhomogeneity correction using the absorption equivalent thickness (AET) method and the pencil beam method for electron dose distribution computations. l) In the AET method. AET factors are used to correct doses for tissue heterogeneties. In our experiment. they were well fitted to the values in the following way, AET=1.2 〓 (for lung tissue) AET=p〓 (for bone or soft tissue) where p 〓 Is the electron density of the tissue. The calculation error of the AET method in a lung tissue equivalent medium, cork, was more than 15% for electron energy of less than 10 MeV and/or small fields, since this method is not capable of taking into account the changes of electrons scattered from the other parts. 2) In the pencil beam method, computating results agreed well with the experimental ones within a maximum error of 10% for every energy range and every field.
View full abstract
-
KOUICHI ENDO, MASATSUNA ISHIZAKA
Article type: Article
1986 Volume 42 Issue 5 Pages
635-642
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
Among the methods for radiological diagnosis, chest radiography is most frequently employed. Exposure of patients to radiation during the taking of chest X-ray photographs was therefore surveyed. Questionnaires were sent to 835 institutions with an abundant experience in chest radiography such as health centers, national hospitals and national sanatoriums all over Japan that are using X-ray photographs for diagnostic use (1984). The skin dose was calculated by the IPH-bit system from the technical factors for exposing of radiography and various items required for radiography stated in the answers from each institution. As a result, the skin surface radiation dose of the patients subjected to single chest radiography averaged 25.8mrem, ranging between the minimum of 2 mrem to the maximum of 120mrem, with about a 60-fold difference being seen in the values. In order to decrease and optimize the medical radiation exposure, exposure factors. apparatus and materials for radiography production such a wide difference should be closely examined with their improvements being attenpted improved.
View full abstract
-
YOSHINOBU SAWA, KAZUHISA SATO, MASANORI NAKAZAWA, KIYOSHI OGURO, YUKIH ...
Article type: Article
1986 Volume 42 Issue 5 Pages
643-648
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
It is a well-known fact that skin injuries after high-energy photon beam radiotherapy are attributed to the secondary electron emitted from acrylic shadow trays. We applied, as a shadow tray material, a high-impact nylon net used generally for tennis rackets, Comparative studies on surface doses in radiotherapy with Linac 10 MV (Toshiba) in conjuction with acrylic trays or the novel nylon net tray were carried out, with the facts being reparted below. In a clinical setting (i.e., source-to-chamber distance 90 cm, tray-to-surface distance 17 cm, field size 15x 15 cm^2), surface doses at a peak depth 25 mm were normalized to the value in the use of conventional trays (5 mm acrylic+10 mm acrylic) respectively in the following tray occasions. a) 5 mm acrylic-high-impact nylon. b) 7 mm lead-acrylic-high-impact nylon. c) hight-impct nylon + high-impact nylon. Normalized data clearly showed improved reduction in the secondary electron of a) 23.6% b) 37.3% c) 42.6% The dramatical reduction (42.6%) in the surface doses thus far obtained by use of the high-impact nylon net tray would greatly benefit clinical radiotherapy.
View full abstract
-
KOICHIRO FUJIKAWA, KOKICHI NIWA
Article type: Article
1986 Volume 42 Issue 5 Pages
649-651
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
TAKESHI IINUMA
Article type: Article
1986 Volume 42 Issue 5 Pages
652-658
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1986 Volume 42 Issue 5 Pages
659-664
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1986 Volume 42 Issue 5 Pages
665-672
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1986 Volume 42 Issue 5 Pages
673-681
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1986 Volume 42 Issue 5 Pages
App13-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
Article type: Bibliography
1986 Volume 42 Issue 5 Pages
Misc1-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1986 Volume 42 Issue 5 Pages
686-688
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1986 Volume 42 Issue 5 Pages
689-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1986 Volume 42 Issue 5 Pages
689-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1986 Volume 42 Issue 5 Pages
689-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1986 Volume 42 Issue 5 Pages
689-690
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1986 Volume 42 Issue 5 Pages
690-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1986 Volume 42 Issue 5 Pages
690-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1986 Volume 42 Issue 5 Pages
690-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1986 Volume 42 Issue 5 Pages
690-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1986 Volume 42 Issue 5 Pages
691-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1986 Volume 42 Issue 5 Pages
691-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1986 Volume 42 Issue 5 Pages
692-699
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1986 Volume 42 Issue 5 Pages
700-701
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1986 Volume 42 Issue 5 Pages
App14-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1986 Volume 42 Issue 5 Pages
Cover15-
Published: September 01, 1986
Released on J-STAGE: June 28, 2017
JOURNAL
FREE ACCESS