Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
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Volume 47, Issue 1
Displaying 1-30 of 30 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1991 Volume 47 Issue 1 Pages Cover1-
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322688
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    1991 Volume 47 Issue 1 Pages Toc1-
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322689
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  • [title in Japanese]
    Article type: Index
    1991 Volume 47 Issue 1 Pages Toc2-
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322690
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages i-vii
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322691
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages viii-
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322692
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  • VISUAL DETECTABILITY OF VARIOUS OBJECT SIZES IN TERMS OF DIFFERENT RADIOGRAPHIC MOTTLE
    AKIO OGURA
    Article type: Article
    1991 Volume 47 Issue 1 Pages 1-7
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322693
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    The detection performance of human observers is very important for mesurements on the evaluation of image quality. It is necessary to improve and to refine the methods of detection performance. The visual detection of a low contrast small objects will be affected strongly by background noise if the texture of the noise is similar to the signal profile. It is predicted that the number of granules of various sizes is not uniform. Therefore, the purpose of this paper is to assess whether the visual detection of signals will depend on the object size. We compared the visual detection of various size objects in terms of a 2-AFC observer performance with a noise Wiener spectrum correlated with the object spectrum using five different radiographic systems. The results indicated that detectability by detection performance depended on object size. From measurement Wiener spectrum, conventional radiography had more granules of one size than the other size. The visual detectability was decreased when the object size is the same as the background granular size. Since the evaluation by observer performance experiments depend on the object size, a low contrast object of adequate size should be chosen by purpose of the examination.
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  • A STUDY OF DOSIMETRY WITH ELECTRON BEAMS : IONIZATION TO ABSORBED DOSE CONVERSION FACTORS WITH CYLINDRICAL IONIZATION CHAMBERS
    KOZO KUMAGAI, KENJI ISHIMATSU, TATSUYA OHTSUKA, FUJIO ARAKI, TAKUMI IS ...
    Article type: Article
    1991 Volume 47 Issue 1 Pages 8-14
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322694
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    We calculated ionization to absorbed dose conversion factors for electron beams with the procedure described in the JARP's 1986 protocol. The calculation deals with 8 types of commercially available cylindrical ionization chambers. We studied a simplified procedure with which the conversion factor of any of the ionization chambers can be substituted for that of the JARP's ionization chamber and presumed the uncertainty of the tumor dose led with the simplified procedure. The exactly calculated conversion factors of the ionization chamber agree with those of the JARP's ionization chamber between +0.5% and -1.7%. The uncertainty of the conversion factors calculated with the simplified procedure is estimated to be 2.8%, if the JARP's procedure lead the uncertainty to 2.3%. Then, the uncertainty of the tumor dose led with the simplified procedure arises from the uncertainty to 5.2%. Therefore, the simplified procedure has an almost equivalent tumor dose accuracy when compared with the JARP's one.
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  • A STUDY OF DOSIMETRY WITH ELECTRON BEAMS : MEAN ENERGY OF ELECTRON BEAMS AT THE PHANTOM SURFACE
    KOZO KUMAGAI, KENJI ISHIMATSU, TATSUYA OHTSUKA, TAKUMI ISERI, FUJIO AR ...
    Article type: Article
    1991 Volume 47 Issue 1 Pages 15-21
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322695
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    For the purpose of calculating the absorbed dose in the water phantom, we studied a simplified procedure with which the mean energy of the electron beams at the phantom surface is determined. The mean energy is determined directly with the measured ionization half value depth in the water phantom applying the relation between the ionization half depth and the mean energy described in JARP's 1986 protocol. The procedure can be applied for both cylindrical and palallel plate ionization chambers. We calculated and evaluated the deviation of the mean energy caused by applying the simplified procedure. The value of the deviation for energy of 25 MeV or less is estimated to be or less than 2.5% applying the data described in the proceding report. The deviation of the calculated absorbed dose caused by the deviation described above is estimated to be 0.5%. The simplified procedure reported is quite simple for application for clinical purposes, and almost equivalent to JARP's one.
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  • MAN-MACHINE INTERFACE AND CONTROL OF FLUOROSCOPIC AND RADIOGRAPHIC TABLE SYSTEM : THROUGH DEVELOPMENT OF MULTIPURPOSE TYPE MODEL TU-230XL
    HIROSHI TAKANO, YOSHIKAZU IGETA, AKIO NAKAJIMA
    Article type: Article
    1991 Volume 47 Issue 1 Pages 22-27
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322696
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    Multipurpose type fluoroscopic and radiographic table systems are used for various types of examinations. These systems have very complex structured and are not always functional for each use. Complex displays on the console panel, for instance, tend to confuse the operator and the equipment divided by each function takes up a great deal of space. Moreover, it is difficult to develop a system which patients are not afraid of, is easy-to-handle by operator and has a variety of functions. We tried to overcome these difficulties by adopting standalone with distributed control techniques and an integrated graphic display for the new model system. In this paper, we would like to express our views regarding the efficient fluoroscopic and radiographic table systems from the point view of control and man-machine interface.
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  • AN ACTUALITY SURVEY OF THE EXTERNAL RADIATION THERAPY IN KINKI DISTRICT : CHIEFLY ABOUT UTILITY OF THE RADIATION THERAPY PLANNING
    YASUMITSU KAWAGOE, TOSHIKUNI KIKUCHI, SHINYA ITO, KUNIAKI SAKURAI, MIT ...
    Article type: Article
    1991 Volume 47 Issue 1 Pages 28-35
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322697
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  • 1. CAROTID BLOOD FLOW MEASUREMENT BY IADSA
    TOSHIO KASUGA
    Article type: Article
    1991 Volume 47 Issue 1 Pages 36-41
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322698
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    The author reports on current trial methods, and examines technical problems concerning blood flow measurement by DSA. Precision of this method depends on the measurement of the blood vessel intra-volume and mean transit time. For the measurement of the blood vessel intra-volume using an amplitude image the diameter of the blood vessel was measured as the Full Width Half Maximum of the profile curve in the transaxial direction of the blood vessel. Diameters of short length sections of the blood vessels were calculated, and then the mean diameter of the blood vessel was determined. Blood vessel volume in the ROI was calculated geometrically, and geometrical enlargement was corrected depending on the depth of the blood vessel. Measurement error was decreased by the use of this averaging method. For the measurement of the mean transit time, the time lag between the two ends of the ROI was measured as a linear approximation of the relationship between distance and time, using time parameters of the above short length sections. On the graph, measurement error was decreased by the exclusion of the areas of turbulant blood flow caused by the shape of blood vessel itself, and those caused by the injection of contrast medium from the tip of the catheter. As for the time parameters, the phase value of the first Fourier transform of the timedensity curve and the peak time of the fitted Gamma-function curve, were adopted for reasons of accuracy compared to other examined parameters. For these two parameters, automated processing, to detect the rise point of the time-density curve, improved the measurement precision of these two time parameters.
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  • 3. QUANTITATIVE MEASUREMENT OF CBF WITH RADIONUCLIDE
    YASUO AIZAWA, TAKENORI HACHIYA, YASUAKI SHOUJI, HIROSHI ONODERA, MIKIO ...
    Article type: Article
    1991 Volume 47 Issue 1 Pages 42-47
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322699
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    Methods for quantitative measurement of cerebral blood flow using radionuclides were described. ^<133>Xe inhalation method is noninvasive and easy for repeating study. But the resolution of image is low. C^<15>O_2 steady state method is the most basic measurement of PET study. Usually this provides not only CBF but also oxygen metabolism, which is indispensable for pathologic analysis of stroke disease. The method of intravenous bolus injection of H^<15>_2O is measured in short scan time. Therefore, it is possible to measure cerebrovascular reactivity to PaCO_2 change, physiological stimulation, and so on.
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  • 4. PRESENT AND FUTURE ASPECT OF BLOOD FLOW MEASUREMENT AT RADIOLOGY DEPARTMENT : FROM THE VIEW POINT OF RADIOLOGIST
    TSUNEHIKO NISHIMURA
    Article type: Article
    1991 Volume 47 Issue 1 Pages 48-52
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322700
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    Measurements of blood flow in organs such as brain and heart has been available by using DSA, MRI and PET/SPECT method. Radiologists and technologists who are working in radiology department have to interest in the blood flow measurement in addition to organ morphology. In this paper, absolute and relative blood flow measurements were divided into two categories (intravascular flood flow and tissue blood flow) and those clinical significances were discussed. The former was used such as caroid and intracardiac blood flow measurements (DSA, CT, Angio, Ultrasound and MRI). The latter was used such as cerebral and myocardial blood flow measurements (PET and SPECT). Furthermore, metabolic activity measurements such as oxygen comsumption and glucose utilization are nessesary to evalate in relation to blood flow, since the mismatch of perfusion and metabolism are often observed in clinical setting. The luxury and misery perfusion (the mismatch of cerebral blood flow and oxygen comsumption) were demonstrated in cerebral infarction in acute stage and the glucose utilization and blood flow mismatch was demonstrated in myocardial ischemia. Therefore, these combined methods were proven to be useful for the assessment of neuron activity and myocardial viability. In conclusion, blood flow measurements shoud be performed actively as "bifunctional chelate" of morphology and metabolism.
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1991 Volume 47 Issue 1 Pages 53-55
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322701
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Article
    1991 Volume 47 Issue 1 Pages 56-63
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322702
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Article
    1991 Volume 47 Issue 1 Pages 64-66
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322703
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1991 Volume 47 Issue 1 Pages 66-67
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322704
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages 68-
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322705
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1991 Volume 47 Issue 1 Pages 69-72
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322706
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1991 Volume 47 Issue 1 Pages 73-
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322707
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages 75-76
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322708
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages 77-78
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322709
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages 79-86
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322710
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages 87-108
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322711
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages 109-111
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322712
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages 111-
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322713
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages 111-
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322714
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages App1-
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322715
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  • [title in Japanese]
    Article type: Appendix
    1991 Volume 47 Issue 1 Pages App2-
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322716
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  • [title in Japanese]
    Article type: Cover
    1991 Volume 47 Issue 1 Pages Cover2-
    Published: January 01, 1991
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003322717
    JOURNAL FREE ACCESS
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