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Article type: Cover
2005 Volume 61 Issue 10 Pages
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Article type: Index
2005 Volume 61 Issue 10 Pages
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Article type: Index
2005 Volume 61 Issue 10 Pages
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[in Japanese]
Article type: Article
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
3-4
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
7-34
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Fujio Araki
Article type: Article
2005 Volume 61 Issue 10 Pages
1365-1372
Published: October 20, 2005
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YOSHIHISA MURAMATSU
Article type: Article
2005 Volume 61 Issue 10 Pages
1373-1374
Published: October 20, 2005
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JUNJI TANAKA
Article type: Article
2005 Volume 61 Issue 10 Pages
1374-1375
Published: October 20, 2005
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KAZUO AWAI
Article type: Article
2005 Volume 61 Issue 10 Pages
1375-1377
Published: October 20, 2005
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TETSUYA HORIUCHI
Article type: Article
2005 Volume 61 Issue 10 Pages
1377-1380
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TOHRU HIRANO, [in Japanese]
Article type: Article
2005 Volume 61 Issue 10 Pages
1380-1384
Published: October 20, 2005
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MASAMI TERADA
Article type: Article
2005 Volume 61 Issue 10 Pages
1384-1386
Published: October 20, 2005
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TOSHIHIRO ISHIHARA
Article type: Article
2005 Volume 61 Issue 10 Pages
1387-1391
Published: October 20, 2005
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TOMOMI KOYAMA
Article type: Article
2005 Volume 61 Issue 10 Pages
1392-1399
Published: October 20, 2005
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SHINJI KAWAMURA, [in Japanese], [in Japanese]
Article type: Article
2005 Volume 61 Issue 10 Pages
1400-1407
Published: October 20, 2005
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YASUO OKUDA
Article type: Article
2005 Volume 61 Issue 10 Pages
1408-1413
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SHINYA OBARA
Article type: Article
2005 Volume 61 Issue 10 Pages
1414-1419
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YASUNOBU NAKO
Article type: Article
2005 Volume 61 Issue 10 Pages
1420-1425
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TSUKASA SASAKI
Article type: Article
2005 Volume 61 Issue 10 Pages
1426-1427
Published: October 20, 2005
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TOSHIO TAKIGUCHI
Article type: Article
2005 Volume 61 Issue 10 Pages
1428-1429
Published: October 20, 2005
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HITOSHI TANIGAWA
Article type: Article
2005 Volume 61 Issue 10 Pages
1431-1440
Published: October 20, 2005
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Two-dimensional prospective acquisition correction (2D-PACE) is a human body motion-correction technique that uses the navigator echo sequence. Clinically, this respiratory-gated technique is used to improve the image quality of magnetic resonance cholangiopancreatography (MRCP). However respiratory motion artifact caused by a mismatch in respiratory rhythm has been experienced. The newly developed breath pacemaker was developed with the aim of providing the best match between the breath cycle and 2D-PACE trigger. The breath pacemaker is composed of two stimulators, an auto voice (AV) system and an auto light (AL) system. The two systems can be controlled separately or concurrently. Using the new breath pacemaker, improvement in MRCP image quality was evaluated in normal volunteers, and definite improvement was noted. Particularly good efficacy was obtained with concurrent control of the AV system and AL system. The results clearly demonstrated that the breath pacemaker can provide good synchronization of 2D-PACE and can lead to enhanced quality of MRCP images.
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KENICHI NAITO, YUKIO OHGOSHI, MASAKI OHKUBO, YUHKO YAGISHITA, JUNKO OK ...
Article type: Article
2005 Volume 61 Issue 10 Pages
1441-1446
Published: October 20, 2005
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The aim of this study was to determine a moderate flip angle (FA) for dynamic liver MR imaging (MRI) with the three-dimensional volumetric interpolated breath-hold examination (3D-VIBE) technique. Images of phantoms with various T_1 values (44-560msec) were acquired with the 3D-VIBE sequence (TR/TE=5.2/2.6msec) using different FA (5-50 degree). We estimated signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR), considered to indicate tumor-to-liver contrast, as a function of FA. In phantoms, in which T_1 values (44-191msec) were assumed to be shortened by the effect of Gd-DTPA in hepatocellular carcinoma (HCC), the highest SNR in each phantom was observed at FA ranging from 15 to 30 degrees. SNRs in other phantoms, in which T_1 values (298-560msec) were assumed to be normal liver-tissue pre- or post-enhancement, were high with FA of 10-12 degrees, and were remarkably decreased with FA of more than 30 degrees. CNR increased as FA increased in every phantom, especially in the phantom with shortened T_1 values (44-191msec), suggesting that enlarging FA improved the tumor-to-liver contrast. Taking both results of SNR and CNR into account, we concluded that a moderate FA was approximately 25 degrees. The advantage with an FA of 25 degrees was confirmed in a clinical study of a patient with hypervascular HCC, in which we could observe coronal enhancement surrounding the lesion in the late phase of the double arterial phase by dynamic MRI using the 3D-VIBE technique.
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YASUSHI YAMAMOTO, YOSHINORI MIYAHARA, MASUO HARAMOTO, AKIO KOMATSU
Article type: Article
2005 Volume 61 Issue 10 Pages
1447-1454
Published: October 20, 2005
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The retention index (R.I.) in Thalliun-201-chloride (^<201>Tl-Cl) brain tumor single photon emission computed tomography (SPECT) imaging analysis is useful in assessing grades of malignancy. When the T/N ratio that influences the R.I. is calculated, it is ideal to draw an ROI on the same slices and coordinates of both early and delayed transaxial images. However, in many institutions, the image slice and ROI are determined manually by operators (i.e., by the conventional method). The Co-registration function within iNRT software enables an ROI to be automatically drawn. In this study, we obtained the R.I. from six brain tumor patients employing two different methods (i.e., Co-registration and the conventional method). Each R.I. was obtained from the same personal computer that was used to transfer the transaxial images. We then compared and evaluated the six R.I. values of seven operators. (2 radiologists and 5 radiological technologists). The results showed that the R.I. values did not differ significantly between the two methods, except in two cases. Furthermore, the coefficient of variation (CV) of the R.I. obtained from the Co-registration method was lower than the conventional method in all cases. The variations among operators were also smaller in the Co-registration method. These outcomes may have been due to the fact that in the conventional method it is difficult to identify the same slices of early and delayed images. Therefore, there were differences among operators in their ways of specifying positions of the ROI. This may have resulted in differences in the number of counts/pixel of the ROI. In conclusion, the R.I. obtained by using the Co-registration method would be more useful for improving diagnostic accuracy in ^<201>Tl-Cl brain tumor SPECT imaging than the conventional method.
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
1455-1457
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
1458-
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
1461-1463
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
1464-
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
1465-
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Appendix
2005 Volume 61 Issue 10 Pages
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Article type: Cover
2005 Volume 61 Issue 10 Pages
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