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Volume 35 (1979)
- Issue 4 Pages 423-
- Issue 3 Pages 316-
- Issue 2 Pages 158-
- Issue 1 Pages 1-
Volume 35, Issue 3
Displaying 1-21 of 21 articles from this issue
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Article type: Cover
1979 Volume 35 Issue 3 Pages Cover7-
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
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Article type: Cover
1979 Volume 35 Issue 3 Pages Cover8-
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
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Article type: Index
1979 Volume 35 Issue 3 Pages Toc5-
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
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Article type: Appendix
1979 Volume 35 Issue 3 Pages i-vi
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
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MASAKATSU HATAGAWA, RIE YOSHIDA, TOSHIHIKO KIMURAArticle type: Article
1979 Volume 35 Issue 3 Pages 316-323
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSWhen MTF is measured by a chart of square wave, square wave MTF has to be transformed into sine wave MTF. Coltman reported the equation for this transformation, in which there is no consideration of a phase shift of harmonic in input wave. We studied this problem and obtained the approximation of the transformation involving a phase shift. Secondly, we simulated measurement of square wave MTF with a computer, and sine wave MTF was calculated by our approximation. We found that phasee shifts depending on the shape of system LSF used, and when a phase shifts, a phase correction is necessary on transformation.View full abstractDownload PDF (813K) -
HIROHARU NAKAMURA, KAZUHIRO MIHARA, TATSUO FUJINOArticle type: Article
1979 Volume 35 Issue 3 Pages 324-330
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSIn the CT scanning of the extremities, defects of the pixels of long bone has been observed. This phenomenon was studied experimentally. In the repeated CT scanning of variously concentrated BaSO_4 solutions, EMI number unexpectedly changed from positive value into negative at certain concentration level. Similar phenomenon was observed in the CT scanning of phantom of extremity in which same solutions were used for bones. We concluded that it is the one of imaging characteristics of our scanner EMI 5005.View full abstractDownload PDF (1157K) -
HIROMOTO UTSUMI, AKIYOSHI OTSUKA, TAKASHI NAKANISHI, TAKASHI YOKOYAMA, ...Article type: Article
1979 Volume 35 Issue 3 Pages 331-337
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSIf the grid is employed in radiography, the exposure and the patient dose naturally increase. The rate of increase of the exposure resulting from the use of the grid is usually expressed by the Bucky factor. The Bucky factor is commonly known to change depending on the grid ratio and the tube voltage, but its change due to other factor has been hardly reported. Therefore, we have measured changes in the Bucky factor due to the thickness of a patient and the irradiation field size, and added a few comments on the patient dose. (Conclusion) (1) The Bucky factor is not constant because it is greatly influenced by the tube voltage, grid ratio, thickness of the patient and the field size. (2) The Bucky factor increases if the tube voltage is low and the grid ratio is high, and also if the patient thickness is great and the field size is large. (3) If the field size is enlarged, the Bucky factor increases, but the surface dose usually decreases, resulting in a conflicting phenomenon. This fact must be born in mind in using the Bucky factor as an indicator of the exposure or the patient dose.View full abstractDownload PDF (707K) -
ISAO NAGAYA, KEIJI INAMURA, YOSHITADA NAKAGIRI, YASUTAKA MIKAMI, KISHI ...Article type: Article
1979 Volume 35 Issue 3 Pages 338-342
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSIn the irradiation therapy of a wide local area such as to the retroperitoneal lymph node metastasis of the seminoma or to multiple lung metastasis, a double irradiation from separate two centers to two radiation fields has been used for decreasing the side effect in the patients. However, there have been some difficulties such as non-uniformity of the radiation doses and impossibilities of definite dicision of the whole radiation area by a linacgraphy. We have, thus, used an alternate irradiation system by applying X-rays to a half side blocked with a lead plate at the line of the center in the whole radiation area, and then to the another half. This system was compared with the double irradiation system used in general. In alternate irradiation system, spreading of the beam was negligible in the boundary area by blocking with a lead plate at the half line and a considerable unformity of the radiation doses could obtained with confirmation of the block line. The whole radiation area was also well certified with one X-ray film. Our system can be very useful for the wide local radiation.View full abstractDownload PDF (930K) -
KAZUHIRO TAKAHASHI, TOSHIO UEDAArticle type: Article
1979 Volume 35 Issue 3 Pages 343-351
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSMany papers have been published on the application of the computers for treatment planning in radio-therapy for many years, and the methods for dose calculations have been presented accordingly. It is the purpose of this paper to examine the fitness of the empirical equations for percent depth dose or tissue-air ratio. Three equations were selected among those equations which have been reported for these years, and were compared with the previously published data. The equations were as follows. [numerical formula] The best agreement was obtained in equation (2), and the standard deviations of differences between calculated and tabulated values in the calculation of percentage depth dose and tissue-peak ratio were about 0.3%, and at all of the tabulated data points, those errors were included less than 1.0% of the maximum dose. Equation (1) was simpler and easier than the others to derive the constants, however the standard deviations of differences were about 1.2%. For deriving the constants, equation (3) was tedious and complicated, though the accuracy of fitness was better than equation (1).View full abstractDownload PDF (972K) -
KINGO TANIGUCHI, TADASHIGE MIYAKAWA, IKKAKU DOINOBU, TADASHI SUNAYASHI ...Article type: Article
1979 Volume 35 Issue 3 Pages 352-357
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSRadioisotope which is produced by milking system is first measured its activity and then prescribed for a patient. For this measurement, a radioisotope calibrator is used. At this time, correction of nuclide, activity, and location of the test material in the well is required. We checked our two ionization chambers and a scintillation calibrator on the measurement error brought about by different radioisotope volume and container. For this purpose, we studied isodose curve, depth where real figure appears, and variation of the indicated value with time. As a result, we found out that there exists twice as much difference regarding the sensitivity depend on the depth in the well. And also, two apparatus of same type showed different isodose curve. Enlargement of the volume of the test material also caused error. Isotope is usually contained in a syringe or vial when they are come into use. Here, sensitivity differes with the shapes of these containers as well as the quantity of the liquid in them. After this study, we can say that at Tc-99m, nearly 20% error is enevitable. At this study, we made a chart to bring out a correction coefficient for each measuring apparatus to correct these errors caused by different volume and different containers. This paper reports the necessity of these error corrections, accuracy, and everyday checking.View full abstractDownload PDF (853K) -
TOMOAKI KONDO, HIROSI MATSUURA, TADASHI TAMIYA, KUNIHIRO OGISO, TSUNEO ...Article type: Article
1979 Volume 35 Issue 3 Pages 358-363
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSA various kind of film for CRT has been able to use by use in taking pictures of CT images. The films subjected to study are as follows : Min-R. NMC. NMB. GTA. (Kodak), RX-M (Fuji), Type-C (Sakura), and Cronex Lo'dose (Dupont). The results obtained are 1) The film quality is very close each other expect for GTA. 2) The quality of GTA shows lower γ-curve as compared with that of the others. This is superior in demonstrating the soft tissue images of CT.View full abstractDownload PDF (707K) -
KIYOSHI ICHIHARAArticle type: Article
1979 Volume 35 Issue 3 Pages 364-380
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
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TADAKO KOSAKAArticle type: Article
1979 Volume 35 Issue 3 Pages 381-389
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSA questionair survery of the quality control and the radiation control was performed on the laboratories of 34 university hospitals, 29 community hospitals, 4 reserch institutes and 9 commercial radioassay laboratories as well. 1) Management of the usage of radioisotopes In 79% of the laboratories, the usage of radioisotope including the purchasing and discarding, was under the control of centralized organization, such as the central radioisotope division. The radioassays were performed by full time physicians in 18.9% and by technologists in 72.4% of the surveyed laboratories. 2) Management of instruments 90.8% of the laboratories has a regular program for background counting, examination for contamination and energy spectrum adjustment. The measurement of radioactivity and calculation of the data were carried out on an automated system in a majority of the laboratories : the percentage of the use of these automated systems were 92.1% for measurement, and 76.3% for calculation respectively. The automated system, however, which covers entire procedue : pipeting of samples and reagents, and B/F separation was used in only 7.9-18.4%. 3) Quality control 89.5% of the laboratory had a specific quality control program for radioassay. Main causes of errors they had encountered were : problems in commercial kits, handling of samples, instrument performance, technical and clerical errors in that order. To prevent these errors, it was thought important to establish the detailed protocols for the radioassay performance.View full abstractDownload PDF (976K) -
MASAAEI USAMIArticle type: Article
1979 Volume 35 Issue 3 Pages 390-399
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSIn vitro examination in the nuclear medicine field, because of its high sensitivity, splendid reproducibility and simple, easy operation procedure, is indispensable for the measurement of microsubstances such as hormone in the blood, etc. Its application extends over a wide range of medical study. This time, we focused on the investigation of several themes of radioimmunoassay which seems most influential and most important. And, we want to keep detailed investigation or description on the entire field of nuclear medicine for another occasion.View full abstractDownload PDF (1177K) -
MORIMICHI UJIIEArticle type: Article
1979 Volume 35 Issue 3 Pages 400-409
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
JOURNAL FREE ACCESSThe following are the result of our investigation of the precision of radioimmunoassays by various types of data processing systems presently performed in Japan. Chose 50 facilities, where 10 facilities of clinical laboratories were included. Tested 344,485 cases per month, which corresponds to 40% of the total number of the cases treated all over the country. It was known that the data of 74% of all facilities and 94% of all tests were being processed by computing machines. In 66 times of data processing of insulin and T3 measurements, 32 were performed by the hyperbola method, 11 by the log-logit curve method of secondary degree, 9 by the logistic curve method and 8 by the log-logit curve method of first degree. Practically in more than 90% of all cases were processed by these 4 types of curve methods. In insulin measurements of many standard points (8 points), favourable results could be obtained by the logistic curve method. On the contrary, in T3 measurements of fewer standard points (5 points), the results from the method of log-logit curve of secondary degree were good. Favourable results of both insulin and T3 measurements could be obtained by the hyperbola method. While, in the insulin measurement by the method of log-logit curve of first degree, the values were a bit lower in the higher and lower concentration ranges, and 3〜4% higher than the actual values in the middle concentration range.View full abstractDownload PDF (1248K) -
[in Japanese]Article type: Article
1979 Volume 35 Issue 3 Pages 410-411
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
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Article type: Appendix
1979 Volume 35 Issue 3 Pages 412-413
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
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Article type: Appendix
1979 Volume 35 Issue 3 Pages 414-416
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
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Article type: Appendix
1979 Volume 35 Issue 3 Pages 417-421
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
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Article type: Appendix
1979 Volume 35 Issue 3 Pages 422-
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
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Article type: Cover
1979 Volume 35 Issue 3 Pages Cover9-
Published: September 01, 1979
Released on J-STAGE: June 28, 2017
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