Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
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Volume 51, Issue 1
Displaying 1-50 of 66 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1995 Volume 51 Issue 1 Pages Cover1-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108955
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  • [title in Japanese]
    Article type: Cover
    1995 Volume 51 Issue 1 Pages Cover2-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108956
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    1995 Volume 51 Issue 1 Pages Toc1-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108957
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  • [title in Japanese]
    Article type: Index
    1995 Volume 51 Issue 1 Pages Toc2-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108958
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  • [title in Japanese]
    Article type: Appendix
    1995 Volume 51 Issue 1 Pages _i_-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108959
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  • [title in Japanese]
    Article type: Appendix
    1995 Volume 51 Issue 1 Pages _i_-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108960
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  • [title in Japanese]
    Article type: Appendix
    1995 Volume 51 Issue 1 Pages _ii_-_viii_
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108961
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  • [title in Japanese]
    Article type: Appendix
    1995 Volume 51 Issue 1 Pages _ix_-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108962
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  • [title in Japanese]
    Article type: Appendix
    1995 Volume 51 Issue 1 Pages _ix_-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108963
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  • [title in Japanese]
    Article type: Appendix
    1995 Volume 51 Issue 1 Pages _x_-_xiii_
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108964
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  • [title in Japanese]
    Article type: Appendix
    1995 Volume 51 Issue 1 Pages _xv_-_xvii_
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108965
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  • IMAGE EVALUATION BY VISUAL CHARACTERISTICS : DITECTABILITY FOR DIFFERRENT KINDS OF FLUORESCENT LAMPS AND FILM-BASES
    TOSHIYUKI AOI, YOSHIYUKI ASAI, MICHIHIRO YAMAGUCHI, HIDEYO MORI
    Article type: Article
    1995 Volume 51 Issue 1 Pages 1-7
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108966
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    For the light source of a viewing box, three kinds of fluorescent lamps were used, and when the film base was made into blue and clear bases, the detectability could be determined. It's a fixed expression, a difference could be seen in the detectability according to the combination of the kinds of fluorescent lamps and film bases used. As regards the results in the discrimination threshold for minimum density, in the clear base, the daylight color was best, but in the blue base, the daylight color was the worst. Regarding the luminance discrimination threshold, the results with the three-narrow band natural color fluorescent lamp and the daylight color fluorescent lamp were good, but in the blue base and at a luminarce of less than 500 cd/m^2, the white color lamp performed best, and at more than 500 cd/m^2, the three-narrow band natural color fluorescent lamp was good. As for the contrast in the visual assessment during clinical assessments, in the clesr base, the three-narrow band natural color fluorescent lamp, and in the biue base, the white color fluorescent lamp were good. Moreover, perhaps not really necessary the color temperature of the combination having good detectability was 5000〜6000 K.
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  • THE STUDY ON THE MEASUREMENT OF QUALITY FOR DIAGNOSTIC X-RAYS
    HITOSHI SATO
    Article type: Article
    1995 Volume 51 Issue 1 Pages 8-12
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108967
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    A T.M.C.method(Tokyo Medical College)capable of calculating the qualities of X-rays(half-value layer, effective energy and uniformity)has been developed. The T.M.C.method was developed based on the Greening's method^1) which can calculate the attenuation curves according to measurements of attenuation ratios using two different aluminum thicknesses. To obtain the best combination of the aluminum thicknesses, the calculation errors for half-value and one-fourth value layers were estimated using 695 types of X-rays between the effective energy range of 25 and 48 keV, which were produced by changing types of generators, tube voltage and additional filters. The best combinations of the aluminum thicknesses to minimize the calculation errors for the two divided energy ranges of 25 to 37 keV and 37 to 48 keV were 2 mm plus 6 mm, and 3 mm plus 8 mm, respectively. The calculated errors for these combinations were less than 2% for both cases. For the measurement of the total energy region using one combination, the best combination was found to be 2.5 and 7.5 mm with a maximum error of 3.4%.
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  • DATA COMPRESSION FOR CHEST RADIOGRAPHY AND MAMMOGRAPHY USING COMPUTED RADIOGRAPHY
    SEIICHI MURAKAMI, NOBUHIRO ODA, KUNIHIRO TERATA, YUKITAKA KAWASHITA, Y ...
    Article type: Article
    1995 Volume 51 Issue 1 Pages 13-18
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108969
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    We have evaluated the degradation of image quality by irreversible data compression in computed radiography (CR). Analysis of the receiver operating characteristics (ROC) curves were made from the images reconstructed with reversible data and two types of irreversible compression data. With acryl beads (2 mmφ) on the phantom simulating chest, the detectablity as regards the images with irreversible compression was lower than that with reversible data. With film disk (5 mmφ, 0.9 mm thickness), there was no difference between the detectability for both images. In clinical cases of chest radiography, ROC for pneumothorax, pulmonary nodules and reticulonodular opacities regards chest rediographs in newborns, infants and adults revealed no significant difference as regards the images, with reversible data irreversible compression. With film disk (10 mmφ, 0.1 mm thickness) regarding the phantom simulating brest, there was no images with a difference in detectability. With glass beads (0.2 mmφ), irreversible compression was inferior to that with reversible data. In clinical cases of mammography, images with irreversible compression were greatly inferior regarding the visibility of calcification smaller than 0.25 mm.
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  • RELATIONSHIP BETWEEN THE CHARACTERISTICS OF SUBJECT THICKNESS : FILM DENSITY AND CHARACTERISTIC CURVE OF LIGHT A SIMULATED SENSITOMETER FOR CINERADIOGRAPHY
    HIROAKI ARAI, MITSUO HASEGAWA
    Article type: Article
    1995 Volume 51 Issue 1 Pages 19-23
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108970
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    When an X-ray cine-camera is used, the characteristics of film density in relation to the change in the thickness of objects could be determined under the same conditions as normal clinical cases. The exposure to film that the X-ray cine-camera has measured at the time of automatic control changed almost linearly in relation to the thickness of the object. However, the correlation of this exposure with the exposure of a light sensitometer is nonlinear;thus the characteristics of this film density differ from the characteristics resulting from light sensitometry. Furthermore, since the relation between the exposures is different according to the film, the differrence of the characteristic curves due to film does not reflect on the differrence of the characteristics regarding the characteristics of film density.
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  • MEASUREMENT OF THE FINA MTF IN A DIGITAL SUBTRACTION ANGIOGRAPHIC SYSTEM
    MASAKATSU HATAGAWA, MASACHIKA SHOGAKI, HIROAKI KUDO, KENJI KISHIMOTO
    Article type: Article
    1995 Volume 51 Issue 1 Pages 24-28
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108971
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    Recently, a digital subtraction angiographic (DSA) system and a computed radiographic (CR) system are widely used for X-ray examination. The resolution property in analog system has been evaluation by modulation transfer function (MTF), however, in digital system, the MTF is not available because it includes an aliasing error which is caused by under sampling. The presampling MTF has been used for digital system, but it evaluates only presampling stage, and does not evaluate overall system. In previous paper, we proposed the final MTF which includes MTF of overall system without aliasing error, and evaluated resolition property of a computed radiographic system (CR) by final MTF. In this paper, we evaluate resolition property of the DSA system by final MTF. The final MTF is obtained from multiplying MTFs of analog components in digital system and it is equal to subtraction the aliasing error from the overall MTF. We concluded that the final MTF is useful for evaluation of imaging property in digital system.
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  • COMPARISON BETWEEN THE 45-SEC PROCESSING SYSTEM AND THE 90-SEC PROCESSING SYSTEM FOR MAMMOGRAPHY
    TOMOYUKI YAMAMOTO, TAKASHI MIZUSHIMA, EMIKO ISHIDA, JYUNSEI HORII, YAS ...
    Article type: Article
    1995 Volume 51 Issue 1 Pages 29-34
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108972
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    To compare the diagnostic quality of mammographs using the 45-sec prosessing system (M200/SR-IC with 45-sec processing) with that using the 90-sec processing system (HR mammo fine/MIMA with 90-sec processing), those imaging properties (characteristic curve, MTF, WS), were measured. The observer performance tests of two processing systems were also carried out. According to the imaging properties, the 45-sec processing system was inferior to the 90 sec processing system in contrast and MTF. The results of the observer performance tests using a RMI-156 phantom also indicated that the 45-sec processing system was inferior to the 90-sec processing system. One of the main reasons why the 45-sec processing system was worse, is thought to be that the 45-sec processing can be obtained sufficient film contrast and film speed.
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  • DYNAMIC MRI FOR THE UPPER AIRWAY
    TAKESHI MAKABE, TAMOTSU MURATA, YASUHIRO HASHIMOTO, KEIICHI TAINAKA
    Article type: Article
    1995 Volume 51 Issue 1 Pages 35-41
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108973
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    Although the conventional airway observations have been performed mainly using fluoroscopy and endoscopy, they both have defects and provide no satisfactory results in a single examination. Therefore, utilizing ultra-fast magnetic resonance imaging (MRI), a study was carried out for kinetic observations around an airway, directly via excellent tissue contrast images. Turbo-fast low-angle shot(FLASH) with T1-weighted 180°preparation pulse was used during scanning. The study was also subjected to variable inversion time(TI) and flip angle(FA). Kinetic observation could be scanned in a second or so, and the dynamic study was carried out under a condition of supposed best tissue contrast. Turbo-FLASH, which is unique ultra-fast MRI in clinical use did not always have good tissue contrast. In the present study, the prolonging of TI and enlarging of FA were confirmed to give much better tissue contrast. Due to the simultaneous prolongation of the scanning time with that of TI, however, TI was set up at 300 msec to allow for a kinetic observation. [TR=8.5 msec, TE=4 msec, FA=12°, slice thickness, 8 mm] Clinically, good tissue contrast images around the airway was obtained and a direct observation could be made via the free sections. We applying the present approach to observations of deglutition and the sleep-apnea syndrome. Regarding deglutition, the present approach is excellent in that easy observation can be made via swallowing saliva while confirming the position and for the sleep-apnea syndrome, it is very good for grasping the obstruction site. Thus, the dynamic study of the airway using turbo-FLASH was shown also to be clinically useful.
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  • EMPIRICAL EQUATIONS OF PHOTON MASS ATTENUATION COEFFICIENTS FOR PHOTON ENERGY 10 KeV TO 150 KeV (MONO ELEMENTS)
    TAKASHI SATO, KOICHI ONO
    Article type: Article
    1995 Volume 51 Issue 1 Pages 42-47
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108974
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  • USEFULNESS AND PROBLEMS OF FILM DOSIMETRY IN HIGH ENERGY RADIOTHERAPY
    HISAE HIRABAYASI
    Article type: Article
    1995 Volume 51 Issue 1 Pages 48-61
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108975
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    Film dosimetry is a convenient and quick method of obtaining a set of highenergy radiation isodose curves in the plane of the film, but it is un empirical methods which presents some problems. Many authors have reported on film dosimetry for industrial films. Recently, the development of computerized densitometor systems, ready-pack films for rediotherapy and automatic film processors has helped improve the procedure. This paper reports our experiences regarding film dosimetry using the new materials, its usefulness in radiotherapy and some of technical problems encountered. The optical density varlue corresponding to a given dose depends upon the processing conditions, for XV-2 film, variation is about 4% when an automaticprocessor is used under controlled conditions. The Off-axis-ratios and the PDD in the perpendicular film plane agree well with the ion-chamber for photon and electron beams;by contrast, the PDD in the parallel film plane is significantly affected by variations in the phantom thickness, the type of film package and misalignment in phantom. But bare films inserted into a cassette made of phantom material agree well for electron beams. Film dosimetry is effective and accurate at the edges of the field and for small fields, due to its high spatial resolution and rapid method. In addition, is usefull for electron beams OCR beam data input;for evaluating the input parameters for treatment planning systems;for quality assurance of the treatment equipment;and for preliminary clinical studies. Even when modern materials are used for film dosimetry, some technical probrems will arise. Thus, to ensure the accuracy, certain precautions are required when setting conditions of film exposure and for quality control of the film processor.
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 62-65
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108976
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 66-71
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108977
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 72-76
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108978
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 77-79
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108979
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 80-86
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108980
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 87-91
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108981
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 92-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108982
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  • [title in Japanese]
    Article type: Appendix
    1995 Volume 51 Issue 1 Pages 93-94
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108983
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 95-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108984
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 95-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108985
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Article
    1995 Volume 51 Issue 1 Pages 95-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108986
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 95-96
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108987
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 96-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108989
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Article
    1995 Volume 51 Issue 1 Pages 96-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108990
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Article
    1995 Volume 51 Issue 1 Pages 96-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108991
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Article
    1995 Volume 51 Issue 1 Pages 96-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108992
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 96-97
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108993
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Article
    1995 Volume 51 Issue 1 Pages 97-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108994
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 97-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108995
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 97-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108996
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 97-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108997
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 97-98
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108998
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Article
    1995 Volume 51 Issue 1 Pages 98-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003108999
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 98-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003109000
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 98-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003109001
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 98-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003109002
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Article
    1995 Volume 51 Issue 1 Pages 98-99
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003109003
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 99-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003109004
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 99-
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003109005
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    Article type: Article
    1995 Volume 51 Issue 1 Pages 99-100
    Published: January 01, 1995
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003109006
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