-
Article type: Cover
1975 Volume 30 Issue 6 Pages
Cover16-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1975 Volume 30 Issue 6 Pages
Cover17-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1975 Volume 30 Issue 6 Pages
App5-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
TOSHIO UEDA, KAZUHIRO TAKAHASHI, CHIAKI KIMURA
Article type: Article
1975 Volume 30 Issue 6 Pages
548-552
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
Several formulas to obtain the contour of the isodose curve in the treatment planning with the aid of electric computer have been reported. Orchard reported the basic idea of decrement line to acquire the isodose charts from the small amounts of experimental data without loss of accuracy. Sterling et al. have approximated the off-axis ratios of cobalt 60 γ-ray beam with cumulative normal probability function. When the treatment planning is crried out using the minicomputer, it is practically reasonable to apply the simple and accurate equation. This paper describes a simple and practical method of the approximation for the decrement value. The dose profiles of the beam along the line parpendicular to the central axis at the depth of 5,10 and 15cm for the therapy unit of cobalt 60 and 6 MV linear accelerator were measured. As these profiles were similar to the sigmoidal curve, Verhulst's logistic curve was used to approximate the curves of dose profiles. The differences between the measured value and the calculated value of our method were three percent at the most. As compared with the other method to calculate the decrement value, this approximation is simple and can be easily applied to the mini-computer.
View full abstract
-
TOSHIO UEDA, YUKIO UCHIYAMA
Article type: Article
1975 Volume 30 Issue 6 Pages
553-558
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
Several pannel diecussions concerned with the use of the electric computer in radiotherapy have been recently hold, and their reports have been published. The use of the time-sharing system with the big machine would be reasonable for the rapid calculation of the dose distribution. If the accuracy of the results is clinically acceptable, the mini-computer will be able to applied in routine daily work instead of the time-consuming hand-calculation. In this paper. the outline of the application of the mini-computer for calculating the dose distribution in external. irradiation was described. The system is so simple to use, and input errors can be easily found out and can be quickly corrected by the key board. Central axis data obtained directly from the dose measurements were stored as a function of the ratio between the field area and the perimeter of the field, which was presented by Sterling et al. The shift method was applied for the correction of the dose inhomogeneity factor in lung tissue. The decrement value and the correction factor for the wedge filters were also stored. The difference between the calculated value and the value obtained by the actual measurement at the 10×10cm field with 6 MV X-ray, were 1% at the depth of 10cm, and 3% at the depth of 25cm. Access time were about 2 hours per patient at the most, therefore, 4-6 cases can be carried out in a day.
View full abstract
-
AKIYOSHI OTSUKA, TOSHIHIKO ODA, YUKIKAGE ITO
Article type: Article
1975 Volume 30 Issue 6 Pages
559-563
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
In recent years, people have become increasingly concerned about radiations, especially those used in the medical field. In this situation, many radiological technicians are required to know about X-ray irradiation doses given to patients. It also is considered important for us to learn practical irradiation doses in X-ray examinations conducted in each hospital and clinic. Therefore, by taking an example of the chest X-ray examination which is one of the most popular diagnostic procedures, we measured the exposure in air just at the back of a 20cm-thick thorax model made of foaming polystyrol at 30 different insitutions in Yamaguchi Prefecture. In these measurements, pocket chambers and film badges were employed. As a result, the average exposure in air was found to be 23.5mR±8.5 (SD).
View full abstract
-
SOTOE KATO, ISAO TAKEDA, YOSHIMASA TSUZAKI
Article type: Article
1975 Volume 30 Issue 6 Pages
564-570
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
This is a report on the fundamental investigation of Triosorb M-125 test, which is a simple method developed by Abbott Laboratories for measuring the triiodothyronine(T_3) in the blood. In this method the radioactive ^<125>I labeled T_3 is used and the values are corrected by the uptake ratio of the control serum. These are the points of difference from Triosorb test. The results of our fundamental investigation were as follows. 1) The T_3M values were more or less affected by the volume of the added serum. 2) The accuracy of the incubation temperature is not necessary. 3) The stable values were obtained for 20 to 30 minutes of incubation. 4) The exact volume of the serum being added, a extremely good reproducibility could be obtained. 5) The values determined by this method and Triosorb test showed a very good correlation(γ=0.94).
View full abstract
-
TAKAYUKI SHIBAYAMA, TADAYOSHI NOGUCHI
Article type: Article
1975 Volume 30 Issue 6 Pages
571-581
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
Although the efficiencies of scintillation cameras have been remarkably improved recently, the detectability of radio-negative tumor images are still extremely poor, comparing with that of the radio-positive tumors, as far as the tumors are buried inside the large organs like liver. To search the causing factors of the differences between the two, we investigated the possible hindrance-factors of the demonstrability of the radio-negative tumor images, stressed upon the patient-factors. The obtained results are as follows : 1. The recognizability of this type of lesions was intimately related to the diameter of the target organs to which the radio-isotopes are specifically distributed. 2. The demonstrability was also strongly influenced by the location of the tumors, namely the depth of the tumors were considered to be a important factor. 3. The depth-resolution power of the collimator should little influences. 4. The densities of the radio-isotopes distributed to the target organs were not considered to be influencial.
View full abstract
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
582-584
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
585-588
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
589-592
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
592-594
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
SHOZO NAKANISHI
Article type: Article
1975 Volume 30 Issue 6 Pages
594-598
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
On tomography photograph, one must fully understand images of obstacles outside of the tomograph plane (obstacle shadow) as well as the image of tomograph plane. Author analyzed the relation between tomography orbit and tomography image, using a simple phantom. The phantoms of imaginary focus in human body were round lead plate of 1cm diameter, lead plate with a hole of 1cm diameter, acrylic pole of 1cm diameter, and acrylic plate with a hole of 1cm diameter. Using these phantoms, I examined the relation between tomography orbits and images of these phantoms. As a result. I observed that even when same orbit and phantom were used, the difference of the location of that phantom made completely different image as if it sujests some other object and sometimes the contrast between images of that phantom and the sorrounding objects were reversed by the locational difference of the phantom. These phenomena were observed in linear, circle, oval and hypocycloid orbits. In cases of oval and hypocycloid orbits, intensity of film injection X-ray partically changes remarkably and forms obstacle shadow. From other experiment. I studied the relation between each tomography orbit and corresponding tomography thickness. By that study, I got the result that orbit of largest angle toward one direction makes the thinnest tomography thickness. From these results, I can say that we must pay enough attention not to mix up images of obstacle shadow and real tomography plane image.
View full abstract
-
[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
599-601
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
602-605
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
606-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
606-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
606-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
606-607
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
607-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
607-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
608-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
608-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
608-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
608-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
608-609
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
609-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
609-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
609-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
609-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
610-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
610-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
610-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
610-611
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
611-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
611-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
611-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
611-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
611-612
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
612-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
612-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
612-613
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
613-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
613-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
613-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
613-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
613-614
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1975 Volume 30 Issue 6 Pages
614-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
614-
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
1975 Volume 30 Issue 6 Pages
614-615
Published: March 31, 1975
Released on J-STAGE: June 25, 2017
JOURNAL
FREE ACCESS