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2002 Volume 58 Issue 7 Pages
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Article type: Cover
2002 Volume 58 Issue 7 Pages
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Article type: Index
2002 Volume 58 Issue 7 Pages
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Article type: Index
2002 Volume 58 Issue 7 Pages
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[in Japanese]
Article type: Article
2002 Volume 58 Issue 7 Pages
I-
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
III-VII
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
IX-XII
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
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YOSHIHIRO NAKAYA, [in Japanese], [in Japanese], [in Japanese], [in Jap ...
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2002 Volume 58 Issue 7 Pages
885-892
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AKIYOSHI OTSUKA
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2002 Volume 58 Issue 7 Pages
893-894
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TSUYOSHI MATSUDA
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2002 Volume 58 Issue 7 Pages
895-903
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KATSUMI TSUJIOKA
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2002 Volume 58 Issue 7 Pages
904-908
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ATSUSHI HATCHO
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2002 Volume 58 Issue 7 Pages
909-910
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KAZUYA YAMASHITA
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2002 Volume 58 Issue 7 Pages
911-915
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SOGO KATO
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2002 Volume 58 Issue 7 Pages
916-919
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YASUNOBU FUKUNISHI, KAZUO HATANAKA, TETSUO IZUMI, MASAMI HISAJIMA
Article type: Article
2002 Volume 58 Issue 7 Pages
921-930
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Grids are used for the purpose of reducing scattered radiation. In portable radiography, however, accurate positioning of the grid is difficult. Errors in alignment may cut off the primary beam, which can result in misdiagnosis. We devised a metal filter with scatter rejection properties and evaluated its performance. The filter, which has no intrinsic alignment mechanism, is placed in front of the IP. We evaluated aluminum (Al), copper(Cu), and tantalum (Ta)filters by comparing them with low-ratio grids of 3:1 and 5:1. In the total evaluation, Ta (0.03mm) demonstrated high visualization of light and minute vascular shadow and visceral pleura, and the Bucky factor was lower than that of the 3:1 grid, while the clinical target was very clear. Because of its high atomic number, Ta can absorb a low energy component effectively even if it is very thin. Because of the K absorption edge, Ta also decreases the high-energy components that cause photographic contrast to decline. Therefore, Ta proved to be a highly suitable material for this research. An air gap within 4cm was not effective for the purpose of supporting the reduction in scattered radiation of the metal filter. The method of placing a metal filter in contact with the patient is more practical and makes the system very thin. This system is thought to be effective for portable radiography because it is light, easy to use, and flexible in structure and does not cause misalignment.
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MASAYUKI TACHIBANA, TAKASHI IZUMI, MASANORI YOSHINAKA
Article type: Article
2002 Volume 58 Issue 7 Pages
931-939
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We measured X-ray absorption and scatter with an acrylic plate attached to the front of the X-ray beam limiting device. The acrylic plate played the role of an added filter, absorbing the low energy element of the X-ray beam and decreasing the surface dose to 4.3% of the extreme height as a result. However, the surface dose outside the irradiation field increased to 35.3% of the extreme height, and the scatter dose increased to 47.8% of the extreme height. An acrylic plate with the minimum thickness necessary should be used to decrease unnecessary exposure outside the irradiation field.
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KAN OHMORI, TSUYOSHI SUGAWARA, KATSUYOSHI MURAKAMI, MIKIO KIRINAI, JUN ...
Article type: Article
2002 Volume 58 Issue 7 Pages
940-947
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The purpose of this investigation was to accomplish reproducible radiography of single-leg standing lateral radiography of the knee by adjusting lateral rotation using a ruler to measure foot position. After preliminary assessment of three-dimensional CT of the knees of normal volunteers, the best adjustment of external rotation was estimated. A ruler was made for use in adjusting the angle of knee rotation by measuring foot rotation. Based on the foot rotation measured by this ruler, the positioning of radiography was adjusted to correct rotation. Rotation was estimated by the distance between the posterior edges of the lateral and medial femoral condyles. Fifteen-degree and 17.5-degree rotations were used for correction. Correction of rotation was 17 degrees on average. This helped not only to correct external rotation in the initial radiography but also to correct rotation for repeat radiography. Our method is quantitative and highly reproducible, and it increases the success rate of lateral knee radiography.
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AKI WATANABE, MASAKI SUGIMOTO, TOMONORI OHSHIMA, KOUSUKE MATSUBARA, MA ...
Article type: Article
2002 Volume 58 Issue 7 Pages
948-956
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In this work, we considered the effect of electromagnetic compatibility (EMC) on electronic instruments used in medical facilities. We simulated and measured the intensity distribution of the electromagnetic field around portable phones and examined the influence of electromagnetic field on telemeter-type electrocardiograms (ECG) and computer display cathode ray tubes (CRT) when portable phones were brought close to them. Results showed that the waves observed on ECG are affected up to a distance of 55cm(3.55E+03V/m)from the portable phone, and the grid of the computer display is affected up to a distance of 9cm(7.16E+04V/m) in the front and 14cm (2.97E+04V/m) in the back. Therefore, to reduce electromagnetic intensity (EMI) maintaining a distance far enough from the source is effective.
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HIDEYUKI MAEJIMA, TAKAHIDE OKAMOTO, NORIHITO YAMAZAKI, KAN HIYOSHI, TA ...
Article type: Article
2002 Volume 58 Issue 7 Pages
957-961
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The technique of "Scapula Y" is effective for capturing forward/backward dislocation of the humeral head and variation in surgical spine fracture. It is also indispensable for describing images of ossification at the tendon plate of the lower lobe of the acrominon and impingement syndrome. However, owing to large individual variations in body shape and position and shape of the scapula, the conventional method does not lend itself to stable reproduction of position or provide adequate diagnostic information. We measured the central angle of entry from scapula m24 pairs of dried bone (Indian) into the spine of the scapula from horizontal and forehead planes to determine the range of variation together with the clinical data referred to in the next paragraph. We then manufactured a trial subsidiary tool to set the angle of the central entering beam base on the acrominon to the spine of the scapula using data on measured angle from 50 clinical radiographs. We identified improvement in radiography of the scapula by using the subsidiary tool designed and manufactured on the basis of the above measured data.
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KEIICHI MACHIDA, NAOKI OOHASHI, HIDEHARU NAKANO
Article type: Article
2002 Volume 58 Issue 7 Pages
962-966
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Perfusion computed tomography (CT) has great value for detecting stroke and evaluating blood flow in the brain. With perfusion CT, it is possible to obtain two absolute values, cerebral blood flow (CBF) (ml/min/100g) and cerebral blood volume (CBV) (%). In using this examination, the main problem is the method of iodine injection. The maximum slope of time-attenuation curve in organs must be reached before the peak enhancement time of the sagittal sinus. To solve this problem, we used a new method in which total injection volume is 30ml, and the rate of injection is 9ml/sec. The data acquisition time is one second for each scan, and the time interval is one second, for 20 scans in total. With this method, we can obtain reliable information on blood flow in the damaged brain. The most common examination used for the detection of brain blood flow is single-phased dynamic CT with Xe inhalation. However, the Xe inhalant examination is difficult to use in the routine clinical setting. Perfusion CT will be more useful for the detection of brain blood flow.
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Article type: Appendix
2002 Volume 58 Issue 7 Pages
967-969
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2002 Volume 58 Issue 7 Pages
970-971
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
973-976
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2002 Volume 58 Issue 7 Pages
977-978
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
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2002 Volume 58 Issue 7 Pages
983-984
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Article type: Cover
2002 Volume 58 Issue 7 Pages
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