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Article type: Cover
1994 Volume 50 Issue 1 Pages
Cover1-
Published: January 01, 1994
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Article type: Index
1994 Volume 50 Issue 1 Pages
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Published: January 01, 1994
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Article type: Index
1994 Volume 50 Issue 1 Pages
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Article type: Index
1994 Volume 50 Issue 1 Pages
2072-2077
Published: January 01, 1994
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Article type: Index
1994 Volume 50 Issue 1 Pages
2078-2081
Published: January 01, 1994
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Article type: Appendix
1994 Volume 50 Issue 1 Pages
i-x
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Article type: Appendix
1994 Volume 50 Issue 1 Pages
xi-xvii
Published: January 01, 1994
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HISASHI YOSHITA, MAKOTO KURANISHI, MAMORU NAKAMURA, SYOSUKE KATO, MITA ...
Article type: Article
1994 Volume 50 Issue 1 Pages
1-5
Published: January 01, 1994
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The Konica Direct Digitizer KD-1000 is a compact chest acquisition unit in digital radiography. The KD-1000 system uses a photostimulable phosphor detector (RbBr : T1) and directly converts X-ray quantum into digitized information. We have studied the physical characteristics of the KD-1000, which consists of inputoutput relationship, spatial resolution and noise. Additionally, we have made a comparison of visual detectability between images from the KD-1000 system and those from a film/screen system (KO-380/HRL), which is used for chest radiography. We have quantified these basic characteristics and established the advantage of the KD-1000 system.
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YOUICHI KENKO, MITSUO SHIOMI, TOSHIHIKO NISHIDA, HIROAKI ITATANI, YOSH ...
Article type: Article
1994 Volume 50 Issue 1 Pages
6-13
Published: January 01, 1994
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The second focus size and distribution of relative pressure were measured with different type shock wave lithotriptors, Dornier MPL-9000 (electrode spark gap type) and Storz Modulith SL-20 (electromagnetic type). The second focus was visualized using Prescale (paper for measuring pressure) and computer graphics. This method was allowed to measure the distribution of the pressure in the second focus when released shock wave was single. Our study showed that in the electrode spark gap type spatial reproductivity of second focus was changed depending on the numbers of released shock wave however in the electromagnetic type it did not depending on the number of released shock waves. In the electrode spark gap type, pressure distribution in the second focus depended on the electrode gap distance which was changed by discharged voltage and the number of released shock wave. In the electromagnetic type, pressure distribution in the second focus was changed only by the energy level, but not by the numbers of released shock waves. Clinically, it would be considered that it was important to know these changes of second focus, so that the stones could be crushed more effectively.
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MICHITO SAWADA, MASATOSHI TSUZAKA, TATSUYA TSUGE, KOJI ODA, KEIKO KOSU ...
Article type: Article
1994 Volume 50 Issue 1 Pages
14-20
Published: January 01, 1994
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In MTF measurements of screen/film systems using square wave chart, the lead thickness of the chart should be uniform in every frequency region. We examined the accuracy of lead thickness and its effects on MTF values. The results of exposures on the films for 7 charts examined showed non-uniformities for some charts. The measured SWRF and the corresponding MTF obtained from non-uniform charts were markedly different from comparable uniform charts. The inaccuracy of the lead thickness in normalization frequency region caused the worst results. Although the square wave chart is commercially available and relatively inexpensive, it is necessary to confirm the accuracy of the chart in terms of the lead thickness in MTF measurements of screen/film systems.
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YOSHIHISA MURAMATSU, KOUJI MISHIO, YUKIHIRO MATSUDA, HISAO NAKANO
Article type: Article
1994 Volume 50 Issue 1 Pages
21-27
Published: January 01, 1994
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Radiation exposure for patients by radiography in Japan is over double that in Europe, America and various other countries. In addition to this, a number of X-ray CT examinations have suddenly increased. In this regard, a study group of computed imaging in Saitama prefecture carried out a performance evaluation of the X-ray CT scanner system. Correlation between radiation dose of patient and low contrast resolution for generation mode of X-ray CT scanner is reported in the paper. As a result, we were able to clarify the following. The patient dose for continuous mode scanner is over double that of the pulse mode scanner for exposure condition of the head. Also, a low contrast resolution increases as the patient dosage increases. However, the difference of generation mode scanner is only slight when compared with the same patient dosage.
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NORIMASA NOHARA
Article type: Article
1994 Volume 50 Issue 1 Pages
28-37
Published: January 01, 1994
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TOSHIYUKI AOI
Article type: Article
1994 Volume 50 Issue 1 Pages
38-42
Published: January 01, 1994
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There has been only a few reports to describing the measurements of light sources and color concerning visual characteristics. So, we carried out visual evaluation using a quantitative analysis of light sources concerning visual characteristics. As the result, the difference of detectability by visual characteristics depends on not only changes in luminosity but also those of wave length.
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TSUTOMU KIKUCHI
Article type: Article
1994 Volume 50 Issue 1 Pages
43-51
Published: January 01, 1994
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CRT (cathode-ray tube) provides the best functions and performance as regards every electric display under the present circumstances ; Therefore, it is one of the key technology for a system to improve in the quality, maintain the performance and control of CRT images when we construct and drive forward with filmless-PACS. However, CRT images are far inferior to a hard copy of CR (computed radiography) ones at present. However, if we process CRT images with better photographic conditions regarding the necessary parts of image with suitable image frequency and gradient processing or magnified viewing function, the ditectability of CRT image would be closer to be the same as CR hard copy or better. In the future, we need to establish optimization in more detail regarding the data collecting method for finding abnormal and on setting up better image disporsal conditions or image processing. Hopefully, CRT will be developed much more as various types of software for diagnosis and applications progresses.
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MITSURU KOMIZU, SATORU MATSUO
Article type: Article
1994 Volume 50 Issue 1 Pages
52-60
Published: January 01, 1994
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In the analysis, the image quality, easiness to use, and cost-performance of the multi-format camera and the laser imager which are used for recording CT, MR and DSA images were compared. The dynamic range of CRT for the multi-format camera is not sufficient to reproduce the digital image and distortion of the image of it was frequently observed. However, high quality CRT provided an image of higher resolution than that of the laser imager. When the laser imager was connected to the diagnostic imaging system, the digital-analog image transfer caused the degradation of the image quality compared with the digital-digital image transfer. However, the laser imager showed some merits in image storage, image processing and image control. In addition, the magnification of the image caused the degradation of the image quality for the multi-format camera. However, the influence of the image size on the image quality was small as regards the laser imager. In conclusion, the laser imager was superior to the multi-format camera regarding CT and MR image while both recording device systems were equal in DSA images.
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KUNIHIKO OHGA
Article type: Article
1994 Volume 50 Issue 1 Pages
61-68
Published: January 01, 1994
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The dry hard copy system for copying medical diagnosis image recordings has been investigated. In the thermal recording system, which deals with the new thermal recording material containing the thermosensitive microcapsule within the corting layer, new materials have been developed which have a high printed image, fine gray-scale shading and high transparency. High quality of printed image have been attained by the combination of materials and printer. As a result, some technical problems for applying a thermal recording system in the area of medical diagnosis image recording have been able to be solved.
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HIROYUKI OHSHIMA
Article type: Article
1994 Volume 50 Issue 1 Pages
69-75
Published: January 01, 1994
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In Liquid Crystal Display (LCD) technology, the current status is reviewed from the viewpoints of each feature, structure and fabrication process, and its future possibility is also examined regarding application to radiological display devices. In terms of current status, the details are centered on TFT (Thin Film Transistor)-LCDs. Some prototypes of high-resolution direct-view LCDs such as a 17-inch 1000×1000 resolution display with 64-256 gray scales have already been developed. For non-direct view LCDs, 4-6 inch 1500×1000 resolution displays with the same gray scale capability have been demonstrated. Concerning future possibilities, requirements of 20-inch 2000×2000 resolution with 256 gray scales will be satisfied in 2000, although the important problems of the viewing angle dependence of image quality and price still remain. Non-direct view LCDs would be a more realistic approach.
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MASAOMI TAKIZAWA
Article type: Article
1994 Volume 50 Issue 1 Pages
76-78
Published: January 01, 1994
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Recent progress in various digital imaging modalities necessites the need for a new image observation device and its hard copy system. This paper introduces the following subjects to be reported at a symposium entitled "Evaluation and Recent Progress of Image Observation System" at the annual meeting of the Japanese Society of Radiological Technology. 1. Visual characteristics in the diagnostic images. 2. Present status, problems and future perspective of image diagnosis based on CRT observation system. 3. Multi-format camera and laser imager -cost & performance study-. 4. Recent progress of the thermal recording film for medical image. 5. The progress of liquid crystal display panel and its future perspective.
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KAZUYOSI ITHO
Article type: Article
1994 Volume 50 Issue 1 Pages
79-88
Published: January 01, 1994
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YOSHIHARU HIRATA
Article type: Article
1994 Volume 50 Issue 1 Pages
89-94
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NAOKI ASADA
Article type: Article
1994 Volume 50 Issue 1 Pages
95-98
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EIJI KIDOYA
Article type: Article
1994 Volume 50 Issue 1 Pages
99-102
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HIROSHI FUJITA, [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1994 Volume 50 Issue 1 Pages
103-106
Published: January 01, 1994
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DU YIH TSAI, [in Japanese], [in Japanese], [in Japanese], [in Japanese ...
Article type: Article
1994 Volume 50 Issue 1 Pages
107-111
Published: January 01, 1994
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TETSURO KATAFUCHI, [in Japanese], [in Japanese], [in Japanese], [in Ja ...
Article type: Article
1994 Volume 50 Issue 1 Pages
112-114
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Article type: Appendix
1994 Volume 50 Issue 1 Pages
115-
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Article type: Appendix
1994 Volume 50 Issue 1 Pages
115-
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Article type: Appendix
1994 Volume 50 Issue 1 Pages
115-
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Article type: Appendix
1994 Volume 50 Issue 1 Pages
116-
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Article type: Appendix
1994 Volume 50 Issue 1 Pages
117-
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Article type: Appendix
1994 Volume 50 Issue 1 Pages
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Article type: Cover
1994 Volume 50 Issue 1 Pages
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Published: January 01, 1994
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