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Article type: Cover
1985 Volume 41 Issue 2 Pages
Cover4-
Published: March 01, 1985
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Article type: Cover
1985 Volume 41 Issue 2 Pages
Cover5-
Published: March 01, 1985
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Article type: Index
1985 Volume 41 Issue 2 Pages
Toc2-
Published: March 01, 1985
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[in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
i-
Published: March 01, 1985
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Article type: Appendix
1985 Volume 41 Issue 2 Pages
a-u
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Article type: Appendix
1985 Volume 41 Issue 2 Pages
216-265
Published: March 01, 1985
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KENJI KISHIMOTO, MASAKATSU HATAGAWA
Article type: Article
1985 Volume 41 Issue 2 Pages
266-270
Published: March 01, 1985
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The image quality of a radiograph can be improved by the use of a small radiation field, the so called spot radiography. In this method, however, because of the small image area, it is not easy to understand the anatomical position of the patient in the radiograph. We developed the holed copper mask that transmitted radiation through the copper to make the image visible, and attached since the collimator of the X-ray tube. The image of the out side of the spot part could also be observed, with the use of the copper mask, the anatomical position of spot part could therefore be confirmed. The contrast of the image was almost equal to that of the conventional spot radiography. It is concluded that the copper mask is useful for spot radiography.
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KAZUO IZAWA, KIYOSHI HATA, JUNICHI SASAKI, SHUNPEI MATSUGI, MASANORI T ...
Article type: Article
1985 Volume 41 Issue 2 Pages
271-278
Published: March 01, 1985
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We measured the reproducibility of the field in radiotherapy by lineacgram and carried out the measurement of the following sites such as the larynx, pharynx, whole brain and the whole pelvis. The measurement points are 5 in the head and neck, and 7 in pelvis. The data of this study were obtained from 536 film sheets for 62 patients during May 1983 to September 1983 period. We used the XTL-5 localization film and Kyokko GF intensifying screen. The reproducibility error was decided with the use of the average and standard deviations. The following results were obtained : 1) The site that has the minimal error is larynx with 4.8 mm ; the maximal error is whole brain with 11.2 mm ; and the whole pelvis with 6 mm. 2) The fixing device is always needed at the head and neck site. 3) Using the fixing device, it was comfirmed that the reproducibility error of the field is due to arrangement of place rather than the patients movement during the treatment time. We further aim, to reduce the scattering shown by the standard deviation than the one by the average value.
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TAKASHI WAKAMATSU
Article type: Article
1985 Volume 41 Issue 2 Pages
279-285
Published: March 01, 1985
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Application of Kanamori's theory for evaluation of radiographic image quality causes great confusion due to contradictions in his information spectrum. To prove the contradiction, information spectra and NEQ(u)_s were calculated for two fold magnification radiography using the same screen-film system and 0.2mm or 1.0mm focal spot, and were not only mutually compared with each other but also with two fold magnification radiographic images of beads and needles. Information spectra disagreed with real radiographic image quality but agreed quite well with NEQ(u)_s. Moreover, the author corrected the self-contradiction in the definition of Kanamori's information spectrum.
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MASANOBU HAYASAKI, ISAO TANAKA
Article type: Article
1985 Volume 41 Issue 2 Pages
286-290
Published: March 01, 1985
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Various factors have been involved in the constitution of DSA picture images. Improvements in each of these factors led to the present advance in DSA. Here, improvement in the performance of TV camera system was discussed as a factor influencing greatly the image quality. Reference was made also to the filtering as a postprocessing of the image obtained.
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TOSHITAKA NAKAZAWA, RYOHSEI WAKATA, YOHICHI KANAI, YURI KITAZAWA, TOSH ...
Article type: Article
1985 Volume 41 Issue 2 Pages
291-296
Published: March 01, 1985
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Among many factors influencing the image quality of the Digital Subtraction Angiography (DSA) image, the artifact due to the mechanical misregistration by mask image and live image was examined. Misregistration, as this is well known by the patient's motion artifact, is used here as the meaning of the spatial shift between the mask image and the live image. In DSA study, mild shift as small as one tenth of a pixel produces an artifact. According to our examinations, the quality of the DSA image is largely fluctuation of power voltage and electrostatical transfer phenomenon in I.I. image. Especially, this phenomenon is recognized about 20 seconds after the start of the X-ray exposure. We must consider the recording time of interval between the mask image and the live image. We hope this paper is contributory to the improvement of I.I. for DSA.
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HIROFUMI HIGASHIMARU, EISYU SHINKAI, HITOSHI BABA, JUNICHI TANAKA, HID ...
Article type: Article
1985 Volume 41 Issue 2 Pages
297-301
Published: March 01, 1985
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Patient dose and contrast resolving power of Digital Subtraction Angiography (DSA) were measured and some other experiment using electronic and geometric magnified DSA were made with Siemens Angiotron. Patient doses were obtained with TLD imbedded in Alderson Rando phantom and the values were compared with conventional angiography. Contrast resolving powers were obtained with self-made acryl vascular chart changing the phantom thickness, I.I. sizes and X-ray doses.
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TAKESHI SAWADA, YUTAKA KINOMURA, YOSHIHIRO IDA, SHIGEHISA FUJII
Article type: Article
1985 Volume 41 Issue 2 Pages
302-307
Published: March 01, 1985
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In recent years the apprication field of digital subtraction angiography (DSA) is expanding. Following are the results of some of the technical problems discussed in connection with the clinical utilization of DSA. 1. After installation of DSA system, the measured brightness of C-arm type Toshiba image intensifier was Gx=0.36. 2. For removal purpose, the scattered radiation air gap method was used instead of grid in which a 15 cm distance was adequate between the patient and the image intensifier. As a consequence, the radiation exposure dose was 30% less than that of using a grid ratio 10 : 1,and the heat load on the X-ray tube was reduced as well. 3. Spatial and contrast resolution of DSA unit were measured using DSA phantom by an image matrix of 512×512. The former was limited to 1 lp/mm of lead bars and the latter, 1 mg/cm^2 of iodine density.
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HIDEAKI TOGI, KAZUO AWAI, TAKASHI WAKAMATSU
Article type: Article
1985 Volume 41 Issue 2 Pages
308-310
Published: March 01, 1985
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Intravenous DSA and intra-arterial DSA have been widely used in the clinical practice. In the present study, enlarged photography of DSA was performed as already practiced in the conventional AOT, Puck and Cine photography. Superior quality of photograph with better contrast could be obtained by enlarging more at the grid (-).
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YOSHIFUMI KITANO, MITUHIRO SUGIMURA, HIROAKI TANAKA, TAKAYASU ITO
Article type: Article
1985 Volume 41 Issue 2 Pages
311-314
Published: March 01, 1985
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DSA has an adjusting circuit system to get a figure without the use of halation. However using only the circuit system is not sufficient enough to provide a proper image without halation. Filters will be necessary to give the best possible image presentation, but the setting of filters are difficult on some parts. Our team has made tubus for the filters in order to make it easy to set them.
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EIJI ATAKA, TETSUO SATO, KAZUMASA SHIMAZAKI, MASAFUMI HOSHI, KIKUO UME ...
Article type: Article
1985 Volume 41 Issue 2 Pages
315-318
Published: March 01, 1985
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It is relatively recent that Digital Subtraction Angiography (DSA) is widely used. At present in most DSA equipments, the images from I.I. and TV systems are processed and recorded to the VTR or VDR first, and then re-processed to monitor-TV or film by Multi Format Camera (MFC). During this processing stage, the spatial and contrast resolution might be caused for example to clarify the peripheral small vasculatures. In addition, it might be difficult to re-construct the clear image on film due to the problems of the Automatic Exposure Circuit in MFC. In this study, Digital Multi Memory was used to keep the image resolution, and the contrast of film was improved by developing new automatic exposure circuit.
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TOSHIKAZU SAIDA, TAMOTSU OCHI, YOSHIMASA MIZUNO, TADASHI YOSHIMINE, SI ...
Article type: Article
1985 Volume 41 Issue 2 Pages
319-322
Published: March 01, 1985
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We developed a peak hold digital subtraction angiography system, and investigated fundamentally the ability of this system and the effect from the performance of its peripheral devices. In addition, we compared it with conventional DSA and FCR. Since the resulting Images were as good as much as the one from conventional DSA at low dose, this peak hold DSA would be very useful in clinical application.
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HIROSHI ONODERA, ATSUSHI INUGAMI, HIDETO TOYOSHIMA, SHIGEKI SUGAWARA
Article type: Article
1985 Volume 41 Issue 2 Pages
323-326
Published: March 01, 1985
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The primary object of this study is reseach on stereo DSA of the cerebral angiography using three methods. (1) Single-tube method…………………Using a head movement machine (2) Double-tube method………………Using two X-ray tubes (3) X-ray-tube movement method……Pendulum shift of the X-ray focal system As a result of this study, it was possible to make a stereo DSA using one injection contrast medium.
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YUJI KAGA, SHIGEO KINAI, YOSHIO TAN, RYUJI SUZUKI, KOHSAKU NISHIO, HIR ...
Article type: Article
1985 Volume 41 Issue 2 Pages
327-330
Published: March 01, 1985
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This report describes a new stereoscopic DSA system using a twin focus X-ray tube which can reconstruct a series of stereoscopic subtraction images by a single injection of contrast medium. Main points which we refer to in this paper are as follows. 1. A real-time stereoscopic view of moving images has been realized on a single TV monitor by this system. 2. A new automatic diaphragm designed for this system and some compensatory filters attached to the image intensifier provide good images without halation. 3. The digital image memories in this system are sufficient enough for large high-speed data acquisition. They are equal to the same series of images taken during conventional stereoscopic serial angiography. 4. The interfocal distance of 63 mm in the X-ray tube provides a stereoscopic pair which can be seen without a sense of incompatibility within a 1.25-fold-magnification through a 10 inch image intensifier. 5. The stereoscopic DSA is greatly appreciated for clinical application.
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EISUKE YASUDA, HIDEO ICHIKAWA, TOKIO ENDO, FUMIHIRO KAWAKAMI, ISAO KAN ...
Article type: Article
1985 Volume 41 Issue 2 Pages
331-334
Published: March 01, 1985
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Purpose of our study was to evaluate the usefulness of DSA combined with conventional angiography. Since higher image quality and less misregistration artifact were obtained by smaller amount of contrast medium, multiplane images could be made without major complications, compared with the conventional serial angiography by catheter. The indication of angiography and clinical usefulness will surely be widened by application of this method.
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MASAYUKI KUMASHIRO, OSAMU ARAKI, YOSHITADA HAYASHIDA
Article type: Article
1985 Volume 41 Issue 2 Pages
335-339
Published: March 01, 1985
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High resolution at the low contrast region in digital subtraction angiography (DSA), enables visualization of several arteries at the same time by intravenous injection of the contrast medium. Taking this advantage, we tried to analyze the functional hemodynamics of the cervical carotid arteries in normal subjects and in patients with stenosis or occulusion. Shimadzu DAR-100 and Sakura microdensitometers were used in this study. Densitometry was performed at the definite level of the bilateral common carotid arteries in each of the frames. Then, relative densities (S) in cross section of the vessel were calculated by means of subtracting background density. Furthermore, S was divided by the square of the vessel radius (this value was defined as true density : D) to correct the differences of the relative densities caused by the variation of the vessel diameter. Therefrom, time-density curve (T-D curve) was obtained by using Gamma distribution function as an approximation. We compared the T-D curve together with the other parameters such as peak time, mean transit time, differential curve and mode of transit time led from the T-D curve, of the stenotic artery with those of the intact artery. In normal subjects, there was no difference in parameters between the left and the right, but in patients with stenosis or occlusion the delay of the peak time or the changes in T-D curve was seen in lesion side.
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[in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
340-342
Published: March 01, 1985
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Article type: Appendix
1985 Volume 41 Issue 2 Pages
343-344
Published: March 01, 1985
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Article type: Appendix
1985 Volume 41 Issue 2 Pages
345-359
Published: March 01, 1985
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TADASHI SUNAYASHIKI, TORU FUJITA, MASAHIRO OMURA, KENICHI ENDO, KINGO ...
Article type: Article
1985 Volume 41 Issue 2 Pages
360-371
Published: March 01, 1985
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We designed various kinds of phantom for the quality control of scintillation camera. These include two types of phantom, "standard phantom" and "JSRT total assessment phantom". The standard phantom set consists of seven phantoms, which allows the assessment of NEMA standards and others. The JSRT total assessment phantom was designed to carry out several items, such as resolution, contrast resolution, linearity, and CRT brightness, needed for the daily control of scintillation camera. This is final report considering the advices from two public forums and from monitoring at 24 institution.
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
372-
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
372-373
Published: March 01, 1985
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[in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
373-374
Published: March 01, 1985
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[in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
374-379
Published: March 01, 1985
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[in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
380-
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Article type: Appendix
1985 Volume 41 Issue 2 Pages
381-384
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Article type: Appendix
1985 Volume 41 Issue 2 Pages
385-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1985 Volume 41 Issue 2 Pages
386-
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
386-
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
386-
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1985 Volume 41 Issue 2 Pages
386-
Published: March 01, 1985
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[in Japanese], [in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
387-
Published: March 01, 1985
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[in Japanese], [in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
387-
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
387-388
Published: March 01, 1985
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[in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
388-
Published: March 01, 1985
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[in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
388-
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1985 Volume 41 Issue 2 Pages
388-
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1985 Volume 41 Issue 2 Pages
388-389
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1985 Volume 41 Issue 2 Pages
389-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
389-390
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1985 Volume 41 Issue 2 Pages
390-
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1985 Volume 41 Issue 2 Pages
390-
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1985 Volume 41 Issue 2 Pages
390-
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1985 Volume 41 Issue 2 Pages
390-391
Published: March 01, 1985
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1985 Volume 41 Issue 2 Pages
391-
Published: March 01, 1985
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