Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
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Volume 50, Issue 11
Displaying 1-25 of 25 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1994 Volume 50 Issue 11 Pages Cover5-
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325671
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    1994 Volume 50 Issue 11 Pages Toc5-
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325672
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  • [title in Japanese]
    Article type: Index
    1994 Volume 50 Issue 11 Pages Toc6-
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325673
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1994 Volume 50 Issue 11 Pages i-
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325674
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  • [title in Japanese]
    Article type: Appendix
    1994 Volume 50 Issue 11 Pages ii-vi
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325675
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  • [title in Japanese]
    Article type: Appendix
    1994 Volume 50 Issue 11 Pages vi-
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325676
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  • BASIC PROPERTIES OF MAMMOGRAPHY UNIT : MEASUREMENT OF HALF-VALUE LAYER
    MASAMITSU MORIYA, AKIRA YOSHIDA, KAZUO OKITA
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1824-1829
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325677
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    X-ray beam quality is one of the most important factors in image contrast of mammograms. Using an X-ray mammography unit, model GE/CGR Senographe 600 T Senix H. F., we investigated the beam quality in terms of : a) the HVL (half-value layer) within the operating range of tube voltage used in mammography, b) a breast compression plate varies the HVL or not, c) variation of HVLs in an X-ray field, and d) problems caused by an unique geometry of the mammography unit concerning HVL measurements. The following results were obtained. a) The HVLs at 26-30kV with the compression plate increases about more than 12% in comparison with that when it is removed. b) The HVL at 26kV with the compression plate is nearly equal to that at 30kV without it. c) The HVL varies in any position of the X-ray field by the heel effect of the X-ray tube. The HVL is smallest at the center posittion near the tube cathode side (i. e., at the center position near chest wall side), at the both ends near the tube cathode side and the center position between the cathode and anode sides on the center line of the image receptor support device, the HVL is about 2% greater than that at the center position near the tube cathode side. Also, the HVL near the anode side is about 10% greater. Therefore, we propose that the measurement of the HVL should be carried out at the center position near the tube cathode side in the X-ray field based on clinical use.
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  • A DEVELOPMENT OF IMAGE (X-RAY FILM) FILING SYSTEM WITH AUTOMATICAL RECOGNITION TECHNIQUE FOR CHARACTERES ON A X-RAY FILM
    MAKOTO KURANISHI, MINORU KONISHI, NAGAAKI OHYAMA, MITATE MATSUI, HAJIM ...
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1830-1838
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325678
    JOURNAL FREE ACCESS
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    Recently, increasing interest in being expressed in Image data filing systems such as Radiology information system (RIS) centering on the treatment of text data operating on on-line connected with Hospital information system (HIS), Picture archiving and communication system (PACS) which digitally filing images, and Image Save And Carry (IS&C). In these image data filing systems, although problems exist in the standardization of the communication protocol with regard to the collection of image data obtained in digital form from X-ray CT and MRI, there is no basic problem concerning data collection. Also, by using a film digitizer to input X-ray films into the image data filing system digitization is feasible. However, at this time, it is necessary to input simultaneously in digital format the index attached to the X-ray film, which when performed manually is both laborious and time-consuming limiting its practicality. At Toyama Medical and Pharmaceutical University Hospital on the occasion of the establishment of an RIS in conjunction with the introduction of an ordering system for X-ray examinations, a system in which a name-card on which the name and other information of the patient is copied on the X-ray film and output by the RIS has been adopted and the font of the text fixed. With this as the base, we have developed a technique in which simultaneous with the digitization of the X-ray film the numerically text like the patient's ID is automatically extracted from the digitized X-ray film data, thereby making treatment of the index more efficient and sparing of labor. This method automatically recognizes the patient's ID number on the X-ray film by Synthetic discriminant function (SDF), and together with an error correction check of the recognized ID verifies it against the RIS database. With this method, correct recognition of patient's ID numbers becomes possible in 97.6% of cases. In addition, as an application of this technique we proposed the construction of a new-concept developing system (The system of automatic X-ray film processor and digitizer with RIS : APR-SYSTEM) in which the automatic X-ray film developer and film digitizer are directly connected and the RIS data utilized. In this way, it will be possible to create an image data filing system using presently used X-ray film in its present form.
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  • BASIC PROPERTIES OF MAMMOGRAPHY UNIT : MEASUREMENT OF EFFECTIVE FOCAL SPOT SIZE
    MASAMITSU MORIYA, AKIRA YOSHIDA, KAZUO OKITA
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1839-1846
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325679
    JOURNAL FREE ACCESS
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    In mammography units, mammograms are taken at the cathode (chest wall) side rather than at the center position of the effective X-ray field (image receptor support) in clinical usage. Furthermore, for magnification and spot technique requiring a higher quality, the center position of the edge of the cathode side in the effective X-ray field is used. Usually, the central rays of the X-ray tubes are positioned according to the line connecting the focal spot to the center position of the effective X-ray field and defined the effective focal spot sizes here. Although in the X-ray tubes of mammographiy units, the central ray is positioned according to the line which connects the focal spot to the center position of the edge of the cathode side in the effective X-ray field. The equipment manufactures specify their focal spots sizes at reference exis which corresponds to the center position of the effective X-ray field. We measured the effective focal spot sizes under the central ray, investigated their changes in the effective X-ray field using a geometrical transform formula. We propose that the effective focal spot sizes should be evaluated not only in the center position of the effective X-ray field but also in the center position of the edge of the cathode side based on clinical usage. The focal spot size and distribution of the X-ray intensity influencing spatial resolution are important factors in mammograms. We also investigated LSF (Line Spread Function) of the X-ray intensity, and MTF (Modulation Transfer Function).
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  • EVALUATION OF TUBE VOLTAGE WAVEFORMS BY FREQUENCY ANALYSIS METHOD; IN INVERTER TYPE X-RAY HIGH-VOLTAGE GENERATOR
    KOICHI CHIDA, HIROYUKI SATO, MASAHIRO SAI, NORIKO HAMAO, MASATOSHI SAS ...
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1847-1861
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325680
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    The tube voltage waveform in an inverter type X-ray high-voltage generator has a very high frequency as compared to single-phase, three-phase and constant potential generators. Tube voltage waveforms in an inverter type X-ray high-voltage generator vary according to tube loading and apparatus. It is very significant that X-ray tube voltage and waveforms should be accurately measured and evaluated. For tube voltage waveforms, the ripple and peak number have been used. However, for high frequency waveforms of tube voltage such as those of the inverter type X-ray high-voltage generator, the ripple and peak number are insufficient for a more detailed estimation. Then, we suggest the frequency analysis method as a newer and more detailed one. In this method, waveforms are analyzed using the fast Fourier transform (FFT). In this paper, the tube voltage waveforms in the inverter type X-ray high-voltage generator will be estimated in detail. The method is convenient to the assessment of distortion and frequency of tube voltage waveforms, especially useful for a detailed evaluation of the inverter type X-ray high-voltage generator. In other words, this method makes possible an objective comparison and careful examination of tube voltage waveforms in the inverter type X-ray high-voltage generator. Therefore, this method is useful for better quality control (QC) of the inverter type X-ray high-voltage generator.
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1862-1871
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325681
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  • MEASUREMENT AND APPLICATION OF MTF
    MASAKATSU HATAGAWA
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1872-1887
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325682
    JOURNAL FREE ACCESS
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    The modulation transfer function (MTF) has been widely used for evaluation of radiographic image quality. In this paper, we describe the measuring methods of the X-ray tube focal spot and screen-film system. Furthermore, we have developed a measuring device consist of a square wave chart and aluminum step for easier and simpler carried out experiments of measuring MTF. On the other hand, for the digital radiographic system, a usual MTF can not be used because its characterics differ from that of the analog system. Therefor, we have proposed to use the final MTF which is the MTF for the digital system. Finally, some applications of MTF are described : the first is the three-dimensional MTF as a function of the thickness of the patient and the second is the noise equivalent number of quanta (NEQ) which is considered as an overall evaluation method for radiography.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1888-1893
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325683
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1894-1904
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325684
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1905-1906
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325685
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1907-1914
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325686
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • Recent Progress in ROC Analysis
    Charles E. Metz
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1915-1922
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325687
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Article
    1994 Volume 50 Issue 11 Pages 1923-1942
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325688
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    [in Japanese]
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  • [title in Japanese]
    Article type: Appendix
    1994 Volume 50 Issue 11 Pages 1943-
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325689
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  • [title in Japanese]
    Article type: Appendix
    1994 Volume 50 Issue 11 Pages 1944-1945
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325690
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  • [title in Japanese]
    Article type: Appendix
    1994 Volume 50 Issue 11 Pages 1946-
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325691
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  • [title in Japanese]
    Article type: Appendix
    1994 Volume 50 Issue 11 Pages 1947-1948
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325692
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  • [title in Japanese]
    Article type: Appendix
    1994 Volume 50 Issue 11 Pages 1949-
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325693
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    1994 Volume 50 Issue 11 Pages 1949-
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325694
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Cover
    1994 Volume 50 Issue 11 Pages Cover6-
    Published: November 01, 1994
    Released on J-STAGE: June 29, 2017
    DOIhttps://doi.org/10.6009/jjrt.KJ00003325695
    JOURNAL FREE ACCESS
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