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Article type: Cover
1983 Volume 39 Issue 4 Pages
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Published: July 01, 1983
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Article type: Cover
1983 Volume 39 Issue 4 Pages
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Published: July 01, 1983
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Article type: Index
1983 Volume 39 Issue 4 Pages
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Article type: Appendix
1983 Volume 39 Issue 4 Pages
i-vi
Published: July 01, 1983
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NORIKO KIMURA, HIROSHI NAGAHATA, KAZUYA YAMASHITA
Article type: Article
1983 Volume 39 Issue 4 Pages
409-415
Published: July 01, 1983
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Radiographic infocus has been analyzed and measured experimentally and theoretically. Generally speaking, eyes of human beings are adaptable to average brightness, the degree of which is independent on the absolute value of the average brightness. That is, human being's eye response to brightness is relatively low, while it is high to the various contrasts. The limitation of the human being's eye recognition of infocus is generally considered to be over 0.2〜0.3 mm, but the data has yet to be actually obtained. We measured many edged infocus materials psychologically by means of three subjective evaluation methods. As a result, we were able to confirmed that the infocus limitation exists between 0.1 and 0.2 mm in both the vertical and holizontal phases. The infocuses over 0.16 mm were judged to be infocus, and the ones under 0.16 mm were not.
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TOSHIKAZU SAIDA, TAMOTSU OCHI, SHIGEKI UYAMA, HIROYUKI NISHIOKA
Article type: Article
1983 Volume 39 Issue 4 Pages
416-419
Published: July 01, 1983
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We have developed a memory system in which traces of moving contrast material can be made into an image. This system is of great value in obtaining maps of the arteries for superselective catheterization.
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SABURO AKIYAMA, TAKESHI ITOH
Article type: Article
1983 Volume 39 Issue 4 Pages
420-425
Published: July 01, 1983
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The performance of Rotate/Rotate-type CT scanners (Toshiba CT scanners TCT-80A) was evaluated based on the items of user's initial acceptance tests (Phase II), in"Standard of performance evaluation for X-ray computed tomography (first recommendation)"proposed by Dr. E. Takenaka et al. in 1979. In this report (Part 1), the results of the measurements of noise, contrast scale, spatial resolution and high contrast resolution are described. The system employs the shift mechanism (direct magnification scheme in order to utilize detectors effectively all the time for various sizes of objects. In scan field S (240 mm dia), noise, contrast scale, spatial resolution and high contrast resolution were 0.41%, 1.8×10^<-4>cm^<-1>/CT, 7.1 lp/cm and 0.75 mm, respectively.
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GUNNILA HOLJE, KUNIO DOI
Article type: Article
1983 Volume 39 Issue 4 Pages
426-447
Published: July 01, 1983
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FUJIMI KINOSHITA
Article type: Article
1983 Volume 39 Issue 4 Pages
448-459
Published: July 01, 1983
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Recently, more than a hundred hospitals are provided with SPECT system for clinical examination in Japan. However, a standardization of mesuring method and performance test of the systems is not, yet made. We have been studying some basic problems of SPECT system with special phantoms originaly designed by ourselves. We got a conclusion that a standardized phantom is necessay for comparing performances between SPECT systems. In clinical experiences with 3,332 cases, we think that SPECT image combined with conventional image presents much more informations for accurate diagnosis, especially in brain, bone and tumor imagings. Synthesized image of SPECT and XCT, double tracer image and transmission image are useful to visualize the body contour and the clinical diagosis.
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KEIJI NAKAZAWA, KAZUSHIGE YODA
Article type: Article
1983 Volume 39 Issue 4 Pages
460-468
Published: July 01, 1983
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Single Photon Emission Computed Tomography (SPECT) utilizing the scintillation camera is now widely used. Clinical application of SPECT may include the detection of organ defect, measurement of organ volume and quantitative measurement of radionuclide accumulation in the organ. The quality of SPECT image is largely influenced by the data acquisition method and the data processing algorithm, and should be evaluated by such parameters as spatial resolution, contrast resolution, signal to noise ratio and linearity between the ECT value and the activity concentration. In this paper, the principle of SPECT and some factors affecting the image quality of SPECT were discussed.
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MAKOTO HAYASHI, MASAAKI KAGAWA, YUKINORI YAMADA
Article type: Article
1983 Volume 39 Issue 4 Pages
469-475
Published: July 01, 1983
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We estimated basically and clinically myocardial ECT image and ECG gated cardiac blood-pool ECT image. ROC curve is used for the evaluation of the accuracy in diagnostic myocardial infarction. The accuracy in diagnostic of MI is superior in myocardial ECT image and ECT estimation is unnecessary skillfulness and experience. We can absene the whole defect of MI than planar image by using ECT. LVEDV between estimated volume and contrast volume is according to it and get one step for automatic analysis of cardiac volume.
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TORU FUJITA, TAKAO MUKAI
Article type: Article
1983 Volume 39 Issue 4 Pages
476-484
Published: July 01, 1983
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The single photom emission CT method (SPECT) using a rotating scintillation camera has rapidly been spreading because of its handiness and usefulness. However, it has some questions theoretically. We studied the quantative capability of SPECT by phantom experiments. Although the ECT values in the reconstructed image were highly quantitative compared with algorithm in the planar image, it was imposible to estimate absolute activities from the ECT values because of theoretical difficulty in corrections of scattering and absorption. We attempted, on some assumptions, a simultaneous correction for scattering and absorption using an interative convolution counts by Walter et al., considering elimination of scattering and improved the quality of the image. The distribution of absorption coefficients in the tomographic plane was obtained by the transmission CT data using ^<99m>Tc flood source, and corrected, assuming that these data are associated with compton scattering less than 90°. It reduced the scattering and improved the reliability of ECT values. As clinical applications, we have reported on the measurements of organ volumes, the ECT method for cerebral blood flow distribution by continuous ^<81m>Kr infusion, the functional ECT image in hepatobiliary scintigraphy, and the gated cardiac blood pool ECT method. We have further suggested that an application for dynamic study will increase in conjunction with the spread of the ring type SPECT equipment.
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HOZUMI IKEDA, KUNIO HAMADA, MASAHIRO OMURA, YOSHIHIRO SHIMONISHI, HIRO ...
Article type: Article
1983 Volume 39 Issue 4 Pages
485-492
Published: July 01, 1983
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To determine the usefulness of the rotating slant hole (RSH) tomography, we evaluated its performonce in phantom studies and clinical applications. The uniformity, sensitivity, resolution were satisfiable enough. The fall in axial resolution was associated with a decrease in planar resolution and both were linearly related to the depth. RSH tomography was more sensitive than planar image (by high resolution collimator) in detecting simulated myocardial defects and could be detected small defect (1 cmφ) in air. When the phantom was tilted 30°, the artifact produced by inducing false defect. This may reduce the specificity of the image. It is necessary to make image in a projection that is more nearly perpendicular to the long axis of the left ventricle. We found the RSH tomography could be useful for comparable small organs spleen, kidney, bone tumor and so on. There are some advantages in RSH tomogaphy such as closer distance between the object and collimator, short time for data aquisition and simple technique. On the contrary, there are some limitations such as one projection tomogram, not suitable for large organs and worse resolution in the deep regions.
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[in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
493-495
Published: July 01, 1983
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Article type: Appendix
1983 Volume 39 Issue 4 Pages
496-498
Published: July 01, 1983
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Bankus AD
Article type: Article
1983 Volume 39 Issue 4 Pages
499-
Published: July 01, 1983
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Fallone BG
Article type: Article
1983 Volume 39 Issue 4 Pages
500-
Published: July 01, 1983
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Article type: Appendix
1983 Volume 39 Issue 4 Pages
501-
Published: July 01, 1983
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
502-
Published: July 01, 1983
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
502-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
502-
Published: July 01, 1983
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
502-
Published: July 01, 1983
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
502-503
Published: July 01, 1983
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
503-
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[in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
503-
Published: July 01, 1983
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
503-
Published: July 01, 1983
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
503-504
Published: July 01, 1983
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
504-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
504-
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
504-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
504-505
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[in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
505-
Published: July 01, 1983
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
505-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
505-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
505-506
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
506-
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Article type: Article
1983 Volume 39 Issue 4 Pages
506-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
506-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
506-507
Published: July 01, 1983
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
507-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
507-
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
507-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
507-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
507-508
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
508-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
509-
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Article type: Article
1983 Volume 39 Issue 4 Pages
509-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1983 Volume 39 Issue 4 Pages
509-
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[in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
509-
Published: July 01, 1983
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1983 Volume 39 Issue 4 Pages
509-510
Published: July 01, 1983
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