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Article type: Cover
2003 Volume 59 Issue 5 Pages
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Article type: Cover
2003 Volume 59 Issue 5 Pages
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Article type: Index
2003 Volume 59 Issue 5 Pages
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Article type: Index
2003 Volume 59 Issue 5 Pages
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[in Japanese]
Article type: Article
2003 Volume 59 Issue 5 Pages
I-
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[in Japanese]
Article type: Article
2003 Volume 59 Issue 5 Pages
II-III
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Article type: Appendix
2003 Volume 59 Issue 5 Pages
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Article type: Appendix
2003 Volume 59 Issue 5 Pages
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Article type: Appendix
2003 Volume 59 Issue 5 Pages
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Article type: Appendix
2003 Volume 59 Issue 5 Pages
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Article type: Appendix
2003 Volume 59 Issue 5 Pages
VI-VII
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Article type: Appendix
2003 Volume 59 Issue 5 Pages
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ISAO MURO
Article type: Article
2003 Volume 59 Issue 5 Pages
579-585
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TAKAYUKI ISHIDA
Article type: Article
2003 Volume 59 Issue 5 Pages
586-593
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SEIJI KAWAMURA, [in Japanese]
Article type: Article
2003 Volume 59 Issue 5 Pages
594-603
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RYUJI SUZUKI, [in Japanese], [in Japanese], [in Japanese], [in Japanes ...
Article type: Article
2003 Volume 59 Issue 5 Pages
604-616
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SHIGERU SANADA
Article type: Article
2003 Volume 59 Issue 5 Pages
617-618
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MASAYUKI Shimosegawa, M. Aoyama, Q. Li, H. Abe, F. Li, J. Shiraishi, K ...
Article type: Article
2003 Volume 59 Issue 5 Pages
619-620
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FUMINORI SHINOHARA, [in Japanese], [in Japanese]
Article type: Article
2003 Volume 59 Issue 5 Pages
621-624
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CHUDO KAZUSA
Article type: Article
2003 Volume 59 Issue 5 Pages
625-626
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MASAYUKI TACHIBANA
Article type: Article
2003 Volume 59 Issue 5 Pages
627-631
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The filter is hung in the direction of slice thickness (Z-axis) in the reconstruction of multi-detector spiral CT. Because of this, performing several time scans is considered useful from the standpoint of reappearance of the section sensitivity profile curves. However, when examination is done at full width half maximum (FWHM) and the position of the center of FWHM, there is non-symmetry and the level of hem extent of the section sensitivity profile curves. Change in FWHM and the position of the center of FWHM increases as pitch increases. Although the change in FWHM was less when the reconstruction slice thickness was increased, the change became larger in the center of FWHM as well. As for the non-symmetry of the section sensitivity profile curves and the level of hem extent, the change decreased when the reconstruction slice thickness was increased, although it increased when pitch was enlarged. It is considered that the cause of these changes is change in table movement speed during scanning.
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SHINJI ABE, MASANARI NISHINO, MASATO YAMASHITA, HIROSHI YAMAGUCHI
Article type: Article
2003 Volume 59 Issue 5 Pages
632-639
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To achieve quantitative accuracy of simultaneous emission/transmission (SET) acquisition using the mask technique, we determined the factor of expression that derives the true transmission data from the measured transmission and emission data. We then evaluated the standardized uptake value (SUV)of the regional activity concentration derived respectively from the SET scans and conventional scans. First, to determine the attenuation factor for the transmission source when the photons of the cylindrical phantom filled with ^<18>F solution reached emission memory, SET scans were performed with a dummy transmission source and under the blank status of the transmission source. Second, to evaluate the SUV, we used a hollow-sphere phantom filled with ^<18>F solution whose activity concentrations were approximately 3 and 5 times that of the background. Then we performed conventional and SET scans of the phantom for solutions ranging from the higher concentration to the lower concentration. All of the data were reconstructed with the decay correction, and the SUV of each sphere was derived. The results demonstrated that, when the conventional factor was used, SUV was underestimated according to the increasing activity concentration of the solution. However, when a new factor that took into account the attenuation of the transmission source was used, there was no significant difference in the SUV. We estimated the SUV derived from the SET scans was within 3% for the large spheres and within 16% for the small spheres.
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TAKAYUKI HASEGAWA, MASAYUKI KOIZUMI, TOMO FURUKAWA
Article type: Article
2003 Volume 59 Issue 5 Pages
640-649
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Absorbed dose was measured in clinical X-ray examinations using TLD. Moreover, we distributed the levels of radiation exposure into 3 classes. The presumed dose of the internal organs, e. g., uterus dose, was computed to depth doses with a surface dose. This information provides a prediction of the influence of radiation, and the examination can be performed with te informed consent of the patient. Moreover, we examined the distribution of the level of absorbed dose. We proposed two kinds of radiation exposure level, one to the fetus in a pregnant woman and a general level of radiation exposure that is not applied to pregnant women. The levels were as follows : 0.5 mGy and 100 mGy were considered the boundaries for fetal radiation exposure in a pregnant woman, and 200 mGy and 3 Gy were considered the boundaries for the general level of radiation exposure (excluding pregnant women).
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AKIHISA IIZUKA, MASAAKI HIRAGAKI, YOSHITERU KIDO, TETSUYA KIMURA
Article type: Article
2003 Volume 59 Issue 5 Pages
650-655
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On abdominal MRI, since priority is given to time shortening during scanning breath-hold imaging, the signalto-noise ratio (SNR) and resolution fall victim. We examined the RF power of the 90-degree pulse becomes the maximum signal of fat in T_1-weighted imaging, and liver with a long T_1 value was noted not to have reached the maximum signal compared with fat. That is, without sacrificing scanning time and resolution by adjusting RF output so that liver would become the maximum signal, it was considered that the SNR of liver substance could be improved. In the phantom experiment, the difference in RF power from which fat and liver became the maximum signal was 1 dB at TR 400 msec. Although a decrease of 10% or less in the fat signal was produced by adding this difference to the RF power obtained by automatic pre-scan, the SNR of liver substance was improved.
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KENGO HARADA, EIJI NISHIMARU, TAKEHARU YUKUTOMO, TAKAYUKI ISHIDA
Article type: Article
2003 Volume 59 Issue 5 Pages
656-662
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The purpose of this study was to develop an image enhancement technique to detect acute cerebral infarct regions in brain MR images. Transverse relaxation times for abnormal changes tend to be longer than those for normal tissues. In order to obtain MR images with two different echo times, we employed the fast spin echo sequence. We then employed the image subtraction technique using two T_2-weighted images to enhance acute cerebral infarct regions. As a result, the areas of acute cerebral infarct regions were enhanced as regions of higher signal than normal regions of brain tissue. Further, high signal areas in dual echo subtraction images corresponded to cerebral infarct regions of high signal areas in diffusion weighted images (DWI). We found that the image subtraction technique is useful to enhance very subtle regions of acute cerebral infarction in MR images. Because we employ the difference between transverse relaxation times for normal and abnormal tissues, which does not depend on the strength of the magnetic field, the dual echo subtraction method can be used in many hospitals.
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Yosuke Matsuda
Article type: Article
2003 Volume 59 Issue 5 Pages
663-
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Article type: Appendix
2003 Volume 59 Issue 5 Pages
664-666
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Article type: Appendix
2003 Volume 59 Issue 5 Pages
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2003 Volume 59 Issue 5 Pages
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2003 Volume 59 Issue 5 Pages
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Article type: Appendix
2003 Volume 59 Issue 5 Pages
669-670
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2003 Volume 59 Issue 5 Pages
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Article type: Cover
2003 Volume 59 Issue 5 Pages
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