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Article type: Cover
1996 Volume 52 Issue 1 Pages
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Article type: Cover
1996 Volume 52 Issue 1 Pages
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Article type: Index
1996 Volume 52 Issue 1 Pages
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Article type: Index
1996 Volume 52 Issue 1 Pages
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[in Japanese]
Article type: Article
1996 Volume 52 Issue 1 Pages
_i_-
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
_xv_-_xvi_
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
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YOSHIHISA MURAMATU, NORIKO AKIYAYA, KOUZOU HANAI
Article type: Article
1996 Volume 52 Issue 1 Pages
1-8
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[Purpose]The object of this study was to clarify the medical exposure in Lung cancer Screening CT (LSCT) using Helical Scan focusing on the dose characteristics of helical scaning, comparisons with conventional chest mass screening, and risk benefit analisis. [Meghods] Radiation dose was measured at both the center and surface of chest and abdominal standard phantoms using a thermoluminescene dosimeter. Scanning parameters employed were 120kV, 50mA, 10mm X-ray beam width, 1s/rotation scanning speed, 20 mm/s couch top movement speed, and 260 mm scanning range. [Results] The dose at the center of the phantom using LSCT was 2.6 mGy, ten times higher than that for conventional mass chest fluorography. On the other hand, the dose was almost the same as that for mass screening fluorography of the upper gastrointestinal tract, only 1.3 times higher. Balance ages in risk benefit analysis were 33 years old for men and 38 years old for women. [Conclusion] Clarification of the characteristics of LSCT has demonstrated that LSCT is suitable for mass chest screening examinations.
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OSAMU YOSHII, MASAKI TOKITA, HIROSHI NARA
Article type: Article
1996 Volume 52 Issue 1 Pages
9-13
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The objective of this report is to obtain a quantitative evaluation of ^<99m>Tc-MAG3 without blood sampling and examined the correlation between the renal uptake of ^<99m>Tc-MAG3 and ERPF calculated from ^<99m>Tc-MAG3. The percent of renal uptake (%RU) estimated by the count-based gamma camera method correlated well with the plasma clearance of ^<99m>Tc-MAG3 (ERPF MAG3) calculated by the single plasma sampling method. The regression equation between the two methods was ERPF MAG3=-11.01+16.27%RU (R=0.907 p<0.0001 n=36). ERPF MAG3 also correlated well with ERPF OIH and the regression equation was ERPF OIH=39.70+1.55ERPF MAG3 (R=0.970 p<0.0001 n=30). From view point of obtaining good imaging quality and the calculation for the quantitative clearance values, ^<99m>Tc-MAG3 is excellent for the patients with renal dysfunction and for emergency cases. However, careful consideration is needed when the imaging and renogram with ^<99m>Tc-MAG3 is evaluated only visually.
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AKIO OGURA, TAKAHARU HONGOH, YOSHINORI IKEMOTO, KEIJI TAKIMOTO, HIROSH ...
Article type: Article
1996 Volume 52 Issue 1 Pages
14-17
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HIROYUKI YOSHIDA, et al.
Article type: Article
1996 Volume 52 Issue 1 Pages
18-26
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AKIRA TSUCHIYA
Article type: Article
1996 Volume 52 Issue 1 Pages
27-31
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In angiograpy, especially interventional radiology, the clinical needs are changing from image diagnostics to therapy. Judging from this trend, the manufacturers of medical diagnostic X-ray equipment should immediately give special consideration to X-ray protection mechanisms, in addition to strict adherence to industry regulations and standards that are necessary for a reduction in exposure dose and protection from unnecessary or excessive radiation, while maintaining present diagnostic image quality. The concrete methods now being studied include a digital control technique, use of X-ray filters, X-ray pulsing low dose mode/low frame rate techniques, and digital filters. Further more, users of medical diagnostic X-ray equipment should be aware that effective protection requires consideration of many things in addition to those concerned with the munufacturing of equipment. These are described at the introduction of IEC601-1-3, and are as foolows : -compatibility of components and correct installation of equipment ; -the protective properties of rooms where X-ray equipment is installed ; -measures for monitoring and maintaining the safety and effectiveness of equipment throughout its life, with particular attention being paid to components that deteriorate due to time and use. -the need under appropriate circumstances for protective clothing to be worn by the staff, and for suitable devices to be used to protect patients -the keeping of appropriate records concerning the usage of the equipment, systematic reviewing of equipment test results, and a call for corrective action when necessary ; -the training of staff about the principles of radiation protection and correct use of equipment, including any protective devices provided.
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HIROMICHI YOKOYAMA, ICHIRO YOKOTA, MASANOBU YAMADA, KEIZOU MURAKAWA
Article type: Article
1996 Volume 52 Issue 1 Pages
32-36
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The risk of exposure dose is increasing together with the advance of interventional radiology (IVR). This means that the exposure dose saving can contribute to the advancement of IVR. We examined the possibility of dose saving from the technical point of fluoroscopy and cineangiography. In terms of dose saving during fluoroscopy, we examined the effect of digital filter on the fluoroscopic image quality and dose reduction. Concerned with cineangiography, we made an experiment to know the effect, of changing cine frame rate on dose reduction and left ventricular volume analysis. As the results, there was the possibility of exposure dose saving, and we considered that other techniques of exposure dose reduction should be examined.
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HIROSHI MIZUTANI
Article type: Article
1996 Volume 52 Issue 1 Pages
37-41
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Recently, interventional treatment for coronary artery disease is developing quickly. However, duration and frequency of fluoroscopy or cine angiogram are increasing so much foreach patients, and skin dose is disregardible. Therefore, we examined a total radiation dosage of coronary patient in our institution, and developed a technique for its reduction. Finally, we found a 30% reduction using an additional X-ray filter with 4.5 mmAl and 35% reduction by X-ray control. We also tried to reduce the duration and frequency of fluoroscopy during catherterzation possibly, but we could not be realized those reduction.
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TAKAAKI HOSOYA
Article type: Article
1996 Volume 52 Issue 1 Pages
42-46
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Currently, interventional radiology (IVR) has been rapidly progressing accompanied by the development of digital subtraction angiography (DSA). In this paper, the present features of IVR according to the different procedures and considerration about an ideal DSA equipment needed for IVR is given. Next, methods for decreasing radiation dose to patients are discussed after a presentation of a patient with actual side-effects from radiation using IVR.
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TADASHI SUNAYASHIKI
Article type: Article
1996 Volume 52 Issue 1 Pages
46-47
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MASARU SHIMIZU
Article type: Article
1996 Volume 52 Issue 1 Pages
48-56
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MIYUKI FUKUTOMI
Article type: Article
1996 Volume 52 Issue 1 Pages
57-59
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YASHUSHI MUKAI
Article type: Article
1996 Volume 52 Issue 1 Pages
60-63
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TAKANOBU IWASAKI
Article type: Article
1996 Volume 52 Issue 1 Pages
63-67
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NORIKAZU YOKOTA
Article type: Article
1996 Volume 52 Issue 1 Pages
67-69
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NAOMI NAGASE
Article type: Article
1996 Volume 52 Issue 1 Pages
70-74
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KENJI NUMAGUCHI
Article type: Article
1996 Volume 52 Issue 1 Pages
74-
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YASUAKI ARAI
Article type: Article
1996 Volume 52 Issue 1 Pages
75-79
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TSUKASA DOI, et al.
Article type: Article
1996 Volume 52 Issue 1 Pages
80-81
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YOSHIHISA MURAMATSU, et al.
Article type: Article
1996 Volume 52 Issue 1 Pages
81-86
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YOSHIMASA NAKAMURA
Article type: Article
1996 Volume 52 Issue 1 Pages
86-89
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KOJI YAMADA
Article type: Article
1996 Volume 52 Issue 1 Pages
90-92
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MITSUTOSHI NAITO
Article type: Article
1996 Volume 52 Issue 1 Pages
92-94
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1996 Volume 52 Issue 1 Pages
95-101
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KAORU MORIKAWA, TAKASHI AOYAMA, YASUMITSU KAWAGOE, TADASHI SUNAYASHIKI ...
Article type: Article
1996 Volume 52 Issue 1 Pages
102-
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
103-104
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[in Japanese]
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1996 Volume 52 Issue 1 Pages
105-106
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
108-110
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
111-112
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[in Japanese]
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1996 Volume 52 Issue 1 Pages
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
114-115
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[in Japanese], [in Japanese]
Article type: Article
1996 Volume 52 Issue 1 Pages
116-
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Article type: Appendix
1996 Volume 52 Issue 1 Pages
117-118
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1996 Volume 52 Issue 1 Pages
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1996 Volume 52 Issue 1 Pages
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Article type: Cover
1996 Volume 52 Issue 1 Pages
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