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Article type: Cover
1995 Volume 51 Issue 5 Pages
Cover22-
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Article type: Cover
1995 Volume 51 Issue 5 Pages
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Article type: Index
1995 Volume 51 Issue 5 Pages
Toc15-
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Article type: Index
1995 Volume 51 Issue 5 Pages
Toc16-
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[in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
_i_-
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Article type: Appendix
1995 Volume 51 Issue 5 Pages
_ii_-_iii_
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Article type: Appendix
1995 Volume 51 Issue 5 Pages
_iv_-
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Article type: Appendix
1995 Volume 51 Issue 5 Pages
_iv_-
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Article type: Appendix
1995 Volume 51 Issue 5 Pages
_v_-
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Article type: Appendix
1995 Volume 51 Issue 5 Pages
_vi_-
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Article type: Appendix
1995 Volume 51 Issue 5 Pages
_vi_-
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SHIGERU MIYAZAKI, TORU NEGISHI, YOH KATOH, SHINJI ABE, IZUMI OGURA
Article type: Article
1995 Volume 51 Issue 5 Pages
573-582
Published: May 01, 1995
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A dynamic mammographic study was carried out for measuring the precision of tube voltage, tube current, and irradiation time; percentage ripple of X-ray tube voltage; linearity and reproducibility of the X-ray-output(fluorescence quantity); radiation quality and photographic effect. Two inverter-type X-ray generators from different manufactures were used. The values obtained were processed with a personal computer. The same X-ray tube unit with a molybdenum target was used for both X-ray generators. Acrylate was used as the X-ray absorber. For both X-ray generators, the percentage average error(PAE) of tube voltage and tube current was rather minimal, 0.2 to 1.0%; the coefficient of variation(C)in the tube voltage, tube current, and X-ray output was also minimal, 0.001 to 0.03. Under conditions of 25 to 40 kV, 10 to 400 mA, X-ray generator A produced a percentage ripple of X-ray tube voltage of from 1.4 to 5.3% for each X-ray loading, and the percentage ripple was greater at lower tube voltages and larger tube currents. With X-ray generator B, the percentage ripple of X-ray tube voltage was 4.7 to 30.5%, and it varied depending on the amount of X-ray loading. The percentage ripple was greater at lower tube voltages and smaller tube currents, and this tendency was more significant when the tube current was less than 100 mA. As regards the photographic effect, the tube voltage of X-ray generator B was lower than that of X-ray generator A by about 5 kV, because generator B showed a greater percentage ripple of X-ray tube voltage. This became more evident when a molybdenum filter(0.03 mm) was used. An X-ray generator, having the most potential, should have the smallest possible percentage ripple of the X-ray tube voltage and coefficient of variation, with the highest possible reproducibility. However, although a generator may have good reproducibility, its X-ray output could vary widely even at the same tube voltage and current time product, if the tube voltage waveform fluctuates to a significant extant(i.e., the percentage ripple of tube voltage is high)in response to X-ray loading. In mammographic imaging, in which the effective tube voltage is low, a high percentage ripple of tube voltage reduces the ineffective ness of the molybdenum-characteristic radiation, increasing soft X-rays, and has a higher irradiation dose. Based on the above, the best possible X-ray generator for mammographic imaging should have a percentage ripple of tube voltage equivalent to that provided by a constant pottential X-ray generator(3 to 4%).
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TAKENORI HACHIYA, YASUAKI SHOJI, YASUO AIZAWA, HIROSHI ONODERA, MIKIO ...
Article type: Article
1995 Volume 51 Issue 5 Pages
583-588
Published: May 01, 1995
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Radioactivity absorption received by humans during C^<15>O_2 and ^<15>O_2 steady-state inhalation using a PET scanner were measured. Relative concentration of radioisotope absorption was measured using the profile scanning mode of the scanner. The volume(ml)of each organ was measured using computed tomography(CT). The accumulation of radioactivity(MBq・sec)in each organ was estimated from the radioactivity concentration(MBq・sec/ml)and volume(ml)of each organ. The radioactivity concentration was obtained using a brain and body emission scanning mode. In the profile image, high uptake organs, namely, the heart, brain, liver, kidneys were observed for C^<15>O_2 inhalation and for ^<15>O_2 inhalation, the heart and lungs were studied. The accumulated radioactivity in each organ was 12.3 MBq・sec for the brain, 13.7 MBq・sec for the lungs, 2.4 MBq・sec for the heart, 1.8 MBq・sec for the liver for C^<15>O_2(185 Mbq/min)inhalation, and for ^<15>O_2(555 MBq/min)inhalation, 11.8 MBq・sec for the brain, 84.8 MBq・sec for the lungs, 5.6 MBq・sec for the heart, 17.1 MBq・sec for the liver.
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[in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
589-593
Published: May 01, 1995
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MICHIO KITAMURA
Article type: Article
1995 Volume 51 Issue 5 Pages
594-595
Published: May 01, 1995
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SHOJIROH KOYAMA, KYOHITO IIDA, TAKASHI ORITATE, KINJI ABE
Article type: Article
1995 Volume 51 Issue 5 Pages
596-598
Published: May 01, 1995
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We have described nuclear medicine equipment for cardiology. Nuclear medicine can provide information about the myocardial metabolism, and play an important role for patients with cardiac diseases. We hope that the development of modalities especially for cardiac imaging will advance in the future. In addition, studies on how to make images more reliable need to be carried out.
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TOSHIKAZU SANMIYA, MICHIE MATSUDA, RYUICHIROH IWASAKI
Article type: Article
1995 Volume 51 Issue 5 Pages
599-603
Published: May 01, 1995
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^<201>Tl scintigraphy can detect ischemia and evaluate myocardial viability by using both stress and redistribution images. It has, however, disadvantage of the viability somewhat underestimated; Compton-scattered photons and their attenuation adversely affect images due to the physical properties of ^<201>Tl; and its image does not have good quality because of the small amount of ^<201>Tl injected. To overcome these problems, ^<99m>Tc-MIBI and ^<99m>Tc-tetrofosmin have been developed so that the ejection fraction and wall motion are evaluated simulaneously. ^<123>I-MIBG and ^<123>I-BMIPP have made it possible to diagnose the myocardial function and its metabolism. Myocardial viability in stunned or hibernating myocardium is still difficult to be detective precisely using SPECT imaging. It can be detected by observing discrepancy between the glucose metabolism(^<18>FDG)and myocardial perfusion(^<13>N-NH_3)with PET studies.
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YUKIO NAKAMURA
Article type: Article
1995 Volume 51 Issue 5 Pages
604-608
Published: May 01, 1995
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Regarding cardiac nuclear medicine, we have reviewed how diagnostic imaging has until now been supported the technological side, and have searched for solutions concerning the problems that have yet to solved. As regards the cardiac function tests, the multi-triggered data acquisition was investigated, and regarding image analysis, we have come up with a fully automated method to determine the left ventricular contour. Furthermore, concerning myocardial examinations, SPECT technology was used, enabling a more accurate detection of the lesions than by using the existing planar imaging technique. With the image analysis, we could develop left ventricular long-axis tomography in which cardiac morphology remains unchanged. On the other hand, with the development of radiopharmaceutical photos of the myocardial energy metabolism and its receptors, which now provide a useful means for detecting. Future problems regarding SPECT technology seems to center on how to remove the scattered rays and how to correct the attenuation effect. More research in this area is needed.
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TAKASHI ARAI
Article type: Article
1995 Volume 51 Issue 5 Pages
609-613
Published: May 01, 1995
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For diagnosing heart diseases that use a clinical inspection prior to 1980, a blood biochemical inspection was carried out. However, those evaluations were shown not to be very accurate. After 1980, radioimmunoassay, has been used for diagnosing heart diseases. This method has only been developed very recently. It shows the structure and clinical significance regarding endothelin in which the myosin light chain I and arterial natriuretic peptide that are used as the clinical inspection method. This type of diagnosing is expected to have wide applications from now on.
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MICHIO KITAMURA
Article type: Article
1995 Volume 51 Issue 5 Pages
614-615
Published: May 01, 1995
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NOBORU SONEHARA, TOMIO KISHIMOTO
Article type: Article
1995 Volume 51 Issue 5 Pages
616-619
Published: May 01, 1995
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KOSAKU MIZUNO
Article type: Article
1995 Volume 51 Issue 5 Pages
620-624
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[in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
625-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
625-628
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HITOSHI BABA
Article type: Article
1995 Volume 51 Issue 5 Pages
629-630
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SHUJI KOYAMA
Article type: Article
1995 Volume 51 Issue 5 Pages
631-635
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KANAE NISHIZAWA
Article type: Article
1995 Volume 51 Issue 5 Pages
636-639
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HIROHUMI MARUISHI
Article type: Article
1995 Volume 51 Issue 5 Pages
640-641
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YOSHIHISA MURAMATSU
Article type: Article
1995 Volume 51 Issue 5 Pages
642-644
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HIROYUKI KOMURO
Article type: Article
1995 Volume 51 Issue 5 Pages
645-
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NORIHISA OGAWA, SHINJI KADOMARU
Article type: Article
1995 Volume 51 Issue 5 Pages
646-648
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MASAHIRO WATANABE
Article type: Article
1995 Volume 51 Issue 5 Pages
649-651
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YOSHIHIKO KAWAMURA, NORIO WATANABE
Article type: Article
1995 Volume 51 Issue 5 Pages
652-655
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MASAYOSHI NISHINO
Article type: Article
1995 Volume 51 Issue 5 Pages
656-659
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YOSHIHISA IMADA
Article type: Article
1995 Volume 51 Issue 5 Pages
660-662
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MAKOTO KIKUCHI
Article type: Article
1995 Volume 51 Issue 5 Pages
663-669
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HIDEAKI YAMAMOTO, ITSUO TAGUCHI, YOSHITAKA OKUMURA
Article type: Article
1995 Volume 51 Issue 5 Pages
670-675
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Article type: Appendix
1995 Volume 51 Issue 5 Pages
676-677
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[in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
678-
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[in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
678-
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[in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
678-
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[in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
678-
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[in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
678-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1995 Volume 51 Issue 5 Pages
678-
Published: May 01, 1995
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1995 Volume 51 Issue 5 Pages
678-679
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
679-
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[in Japanese], [in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
679-
Published: May 01, 1995
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1995 Volume 51 Issue 5 Pages
679-
Published: May 01, 1995
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1995 Volume 51 Issue 5 Pages
679-
Published: May 01, 1995
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
1995 Volume 51 Issue 5 Pages
679-
Published: May 01, 1995
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