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1996 Volume 52 Issue 8 Pages
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Article type: Cover
1996 Volume 52 Issue 8 Pages
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Article type: Index
1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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[in Japanese]
Article type: Article
1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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AKIO OGURA, YOSHIKI NAKAYAMA, YUKIO ISHIBASHI, RYUICHI YAMAMOTO, SHINO ...
Article type: Article
1996 Volume 52 Issue 8 Pages
873-877
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The image quality of magnetic resonance imaging systems has usually been evaluated for the signal-to-noise ratio, imaging contrast resolution and other factors, but not for spatial resolution. Recently, the fast spin echo (FSE) imaging technique has become indispensable in clinical MRI. However, this sequence is susceptible to a new set of artifacts, such as image blurring secondary to nonuniform sampling of K-space. Therefore, we measured the spatial resolution of MR images using the final modulation transfer function (final MTF). The influence of the technical factors of MRI on the final MTF, such as signal-to-noise ratio (SNR), slice thickness, and the position of the phantom in the magnetic coil were examined. SNR was found to affect the final MTF measurement, and SNR of at least 50 was necessary for accurate measurement. In addition, the position of the phantom affected the final MTF values. From this basic study, we produced a protocol for the measurement of spatial resolution on MR images using the final MTF.
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MANABU NAKATA, TAKASHI OKADA, YOSHINORI KOMAI, HIROKI NOHARA
Article type: Article
1996 Volume 52 Issue 8 Pages
878-885
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Modern linear accelerators have four independent jaws and multileaf collimators (MLC) of 1 cm windth at the isocenter. Asymmetric fields defined by such independent jaws and irregular multileaf collimated fields can be used to match adjacent fields or to spare the spinal cord in external photon beam radiotherapy. We have developed a new approximate algorithm for depth dose calculations at the collimator retation axis. The program is based on Clarkson's pronciple, and uses a more accurate modification of Day's method for asymmetric fields. Using this method, tissue-maximum ratios (TMR) and field factors of ten kinds of asymmetric fields. and ten different irregular multileaf collimated fields were calculated and compared with the measured data for 6 MV and 15 MV photon beams. The dose accuracy with the general A/Pe method was about 3%, however, with the new modified Day's method, accuracy was within 1.7% for TMR and 1.2% for field factors. The calculated TMR and field factors were found to be in good agreement with measurements for both the 6 MV and 15 MV photon beams.
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
887-889
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1996 Volume 52 Issue 8 Pages
890-899
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[in Japanese], [in Japanese], [in Japanese]
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1996 Volume 52 Issue 8 Pages
900-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
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1996 Volume 52 Issue 8 Pages
900-
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1996 Volume 52 Issue 8 Pages
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1996 Volume 52 Issue 8 Pages
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[in Japanese], [in Japanese], [in Japanese]
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1996 Volume 52 Issue 8 Pages
901-
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[in Japanese], [in Japanese], [in Japanese]
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1996 Volume 52 Issue 8 Pages
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
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1996 Volume 52 Issue 8 Pages
902-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
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1996 Volume 52 Issue 8 Pages
902-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
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1996 Volume 52 Issue 8 Pages
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
1996 Volume 52 Issue 8 Pages
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Article type: Article
1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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1996 Volume 52 Issue 8 Pages
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
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1996 Volume 52 Issue 8 Pages
909-
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