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1979 Volume 35 Issue 2 Pages
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Article type: Cover
1979 Volume 35 Issue 2 Pages
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Published: July 01, 1979
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Article type: Index
1979 Volume 35 Issue 2 Pages
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Article type: Appendix
1979 Volume 35 Issue 2 Pages
i-iv
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AKIYOSHI OTSUKA, YOSHIHARU HIGASHIDA, HIROMOTO UTSUMI, MASAJI OTA, TAK ...
Article type: Article
1979 Volume 35 Issue 2 Pages
158-167
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In the preceding report, we dealt with the field size and the tube voltage. This paper covers the differences in patient dose due to the focus to film distance (FFD), the patient thickness and whether the grid is used or not. Regarding the FFD, 100 cm is most commonly employed except in X-ray examinations of the chest, but from the viewpoint of the patient dose, this requires special consideration as to whether there is any theoretical basis for it. The patient thickness has a great bearing on the patient dose, but there is an individual difference, and it is almost impossible to change it artificially. However, there has been no detailed report on the relation between the patient thickness and the patient dose, therefore, this report treats of such relationship as well. Concerning the grid, consideration is given to the exposure times (Bucky factor).
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TAKESHI SAWADA, KAZUTAKA EJIRI, TAKAHIKO KAJIHARA, SHOICHI SUZUKI, SHI ...
Article type: Article
1979 Volume 35 Issue 2 Pages
168-174
Published: July 01, 1979
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We discussed the slice thickness of profile of two different machines which could be grouped into 180° two-slice scanner (head scanner) and 360° one-slice scanner (whole body scanner). The results as follows : 1.The slice thickness of 180° two-slice scanner was not same in the horizontal and the vertical plane. The slice thickness was thicker 1.5 times on the periphery than in the center and also thinner on the tube side than on the detector side. The two slice profiles of 360° one-slice scanner were symmetric and the distribution of CT numbers was even. The slice thickness was thicker 1.2 times on the periphery than in the center. 2.We investigated the influence of the ten kinds of weighting functions on the slice thickness. The close relationship between the slice thickness and weighting function was clearly demonstrated. Thus, it is necessary for us to measure slice thickness more precisely utilizing the raw data obtained from the cross-section of a phantom.
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ISAO YONETA
Article type: Article
1979 Volume 35 Issue 2 Pages
175-178
Published: July 01, 1979
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A small-sized multimeter has been made by way of trial, which will easily collect such data of the output of an X-ray apparatus as electrical value, time and exposure when the X-ray apparatus is safely kept under control. The multimeter, which has three meters, can measure primary voltage under load (V), exposure time (s), time error of synchronize switching (ms), electric volume of X-ray tube (mAs), current of X-ray tube (mA), total exposure (μC/kg) and exposure rate (nC/kg/s) by errors within ±3%. The active device of electrical circuit is mainly composed of twelve linear I.C.'s, four transistors, two F.E.T's, and six V.R.D.'s. The multimeter measures 15 cm. by 20 cm. by 30 cm. high and weighs 4.8 kg.
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HIROSHI HASHIMOTO
Article type: Article
1979 Volume 35 Issue 2 Pages
179-184
Published: July 01, 1979
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Article type: Article
1979 Volume 35 Issue 2 Pages
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Article type: Article
1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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Article type: Appendix
1979 Volume 35 Issue 2 Pages
186-188,190,19
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Article type: Article
1979 Volume 35 Issue 2 Pages
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Article type: Article
1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
187-188
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Article type: Article
1979 Volume 35 Issue 2 Pages
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Article type: Article
1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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Article type: Article
1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
189-190
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
191-192
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1979 Volume 35 Issue 2 Pages
192-193
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
196-197
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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1979 Volume 35 Issue 2 Pages
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