Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
Volume 45 , Issue 11
Showing 1-28 articles out of 28 articles from the selected issue
  • Type: Cover
    1989 Volume 45 Issue 11 Pages Cover4-
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (76K)
  • Type: Index
    1989 Volume 45 Issue 11 Pages Toc5-
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (46K)
  • Type: Index
    1989 Volume 45 Issue 11 Pages Toc6-
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (48K)
  • Type: Appendix
    1989 Volume 45 Issue 11 Pages i-ii
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (103K)
  • Type: Appendix
    1989 Volume 45 Issue 11 Pages iii-
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (52K)
  • Type: Appendix
    1989 Volume 45 Issue 11 Pages iv-v
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (128K)
  • Type: Appendix
    1989 Volume 45 Issue 11 Pages vi-
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (59K)
  • Type: Appendix
    1989 Volume 45 Issue 11 Pages vi-
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (59K)
  • MANABU NAKATA, TAKEHIRO NISHIDAI, HIROKI NOHARA, TAKASHI OKADA, SHINSU ...
    Type: Article
    1989 Volume 45 Issue 11 Pages 1708-1716
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    A new 3-dimensional (3-D) computation algorithm, "Modified equivalent TMR method", for photon beam dose calculation, considering heterogeneous corrections, has been developed. This algorithm is base on the modified equivalent TAR method that was proposed by Inamura et al. The modified equivalent TAR method was deduced from the equivalent TAR method proposed originally by Sontag and Cunning ham. In addition, reducing the computational time during treatment planning, the concept of quasirandom number suggested by Inamura et al, is adopted for this algorithm. The purpose of this study is to evaluate the accuracy of the dose computations of this new algorithm. The accuracy is compared with both measure and calculated data for Cobalt-60 gamma rays and 10 MV photon beams for various geometries and field sizes on the axis. Weighting factor expressing the relative importance of each volume element in contributing to the scatter dose at the point of calculation, is computed using the three following models that are exponentially approximated as the distance function from the scattering point to the calculation one. 1) "All Scatter model" accounts for the all scattering points. 2) "No Back Scatter model" only takes account of the forward scattered radiation at the calculation point. 3) "Compton Scatter model" takes account for the contributing rate of the scatter dose at the calculating point using the approximation of Klein-Nishina's angular distribution. Using the modified equivalent TMR method, we show that the accuracy of a 3-D dose computation is less than 2% for a homogeneous medium and about 6% for a heterogeneous one. This algorithm is possible for calculating a 3-D dose distribution for short periods of time in actual treatment planning and also for to photon beam applications with more than 6 MV.
    Download PDF (914K)
  • MASAMI KATSURAGAWA, HIROO SEGAWA, TOSHIAKI KUSUHARA, SETSUO NAKASE
    Type: Article
    1989 Volume 45 Issue 11 Pages 1717-1723
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    The measured values of the regional cerebral blood flow (r-CBF) changes by using a certain of measurement and data analysis methods. We studied the quantitative analysis of r-CBF using the CT 9800 Xenon CBF Imaging System with a stable Xenon. The values of r-CBF are influenced by several input factors, i.e., the numbers of baseline scans, the image numbers of enhancement scans, the hematocrit values and smoothing methods. Using the acquired data from 20 patients, we evaluated the infuluences of those input factors. In the result, no significant difference in each of the mean values exested, the changes of those input factors produced variations of 1 to 10% in the calculated r-CBF. It is important for clinical estimations of r-CBF to recognize the fundamental parameters of the apparatus.
    Download PDF (739K)
  • MASATOSHI GOTO
    Type: Article
    1989 Volume 45 Issue 11 Pages 1724-1735
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (1426K)
  • AKIRA KATOHNO
    Type: Article
    1989 Volume 45 Issue 11 Pages 1736-1744
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    In case of the general radiography among the radiographic technics, there are engaged in slightly more numbers of single phase 2 peak generators than 3 phase 6 or 12 peak generators, in Japan. We must take radiography of various body parts with many radiographic technics in the general radiography, and the short exposure time radiography is a common technic through the general radiography. Especially, the short exposure time technic is essential to the chest and the baby radiography. On this point of view, 3 phase 6 or 12 peak generators which have greater X-ray output and fine exposure time control, are more suitable X-ray machine than single phase 2 peak. Large current short exposure time radiographies by 3 phase generators have some problems in X-ray linearity failures to the X-ray tube currents and the exposure times and percent-ripple change with milliamparage. Recently, there introduced the inverter type X-ray generator in Japan. The inverter type machines have the same X-ray output as the 12 peak generators and better features which are accurate control by microprocessor technic, tube voltage feed back technic and so forth. To apply this type of generator to the general radiography, the characteristics of dynamic respons are reported in this paper and high quality radiography can be taken constantly by this machine.
    Download PDF (888K)
  • FUKUO YONEKURA
    Type: Article
    1989 Volume 45 Issue 11 Pages 1745-1750
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    A X-ray table that is being used in radiographing takes the part of bed. It is used to lay patient still on it during exposure. Even now this role has not changed since X-rays were used in medical purpose. Today various types of X-ray table devised for special uses, for example, for children, the head, ACG, and urography. Radiographic technology made a quantum leap with the advent of the moving grid in 1920 by Dr. Potter. This innovation provided a great improvement in radiographic technique in terms of contrast and definition followed by a reduction of scattered radiation. In this paper, I would like to mention about how the regulations of X-ray diagnostic table is enacted in Japan, and the history of excluding scattered radiations.
    Download PDF (775K)
  • YOSHIHIKO KAWAMURA
    Type: Article
    1989 Volume 45 Issue 11 Pages 1751-1765
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    I made a report to this Symposium relating to positioning out of the radiographic techniques. It indicated present problems to be solved before discussing the prospects for the techniques in the future. First, I pointed out the necessity of rearranging the present radiography so that it could stand up as technology more firmly. For this purpose, it is necessary to grasp the process of forming the radiography techniques systematically and newly put them in order. Secondly, an analysis of the tendency of making use of radiography showed that it was advancing in the direction of metric diagnosis and that there were demands for highly precise and reproducible X-ray images. I remarked that it was a subject to be solved how technologists meet such demands. That is, we are now at a turning point in dealing with technical steps. Thirdly, I stressed the importance of systematically constructing radiographic techniques on the basis of diagnosing physicians' demands for them. This can be said to be natural from the viewpoint of communicating X-ray image information, too. The report showed an outline of the flowchart of radiographic technique construction (a continuous flow from appearance of diagnosing physicians' demands to technical evaluation of radiography). To explain this outline, I gave the radiography of foramen opticum as an example. As the fourth subject, the respective items of the flowchart need be put in order to establish the radiographic techniques for various sites. This requires accumulation of technical data. Promotion of full-scale use of databases is also believed to be needed. Those subjects are thought to be the items first to be solved in considering the future of the radiographic technologies.
    Download PDF (1677K)
  • MASATAKE IMAI
    Type: Article
    1989 Volume 45 Issue 11 Pages 1766-1776
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Photosensitive materials that have major part of radiographic diagnosis, have been developed for over ninety years. In this presentation, historical changes of photosensitive materials were discussed with their present status and problems. Regular system of intensifying screen with CaWO_4 has been used for long time. Recently, the system of intensifying screen with rare earth has been developed, making a certain progress on image quality of radiography. We should select the best one among these various photosensitive materials, in order to get better medical information, acording to the diagnostic purposes.
    Download PDF (1092K)
  • KAZUHIKO SAITO
    Type: Article
    1989 Volume 45 Issue 11 Pages 1777-
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (179K)
  • [in Japanese], [in Japanese]
    Type: Article
    1989 Volume 45 Issue 11 Pages 1778-1779
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (209K)
  • YUTAKA NAKAMURA
    Type: Article
    1989 Volume 45 Issue 11 Pages 1780-1784
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (609K)
  • NORIO NAKAO
    Type: Article
    1989 Volume 45 Issue 11 Pages 1785-1790
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (967K)
  • [in Japanese]
    Type: Article
    1989 Volume 45 Issue 11 Pages 1791-1792
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (226K)
  • [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Type: Article
    1989 Volume 45 Issue 11 Pages 1793-1799
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (825K)
  • [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Type: Article
    1989 Volume 45 Issue 11 Pages 1800-1803
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (547K)
  • [in Japanese]
    Type: Article
    1989 Volume 45 Issue 11 Pages 1804-
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (168K)
  • Type: Appendix
    1989 Volume 45 Issue 11 Pages 1805-
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (99K)
  • Type: Appendix
    1989 Volume 45 Issue 11 Pages 1806-1808
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (260K)
  • Type: Appendix
    1989 Volume 45 Issue 11 Pages 1809-1811
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (223K)
  • Type: Appendix
    1989 Volume 45 Issue 11 Pages App4-
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (103K)
  • Type: Cover
    1989 Volume 45 Issue 11 Pages Cover5-
    Published: November 01, 1989
    Released: June 28, 2017
    JOURNALS FREE ACCESS
    Download PDF (112K)
feedback
Top