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Title :Elliptical Centric法を用いた造影三次元MR Angiographyにおける造影効果持続時間および撮像タイミングに関する検討
Title alternative :Duration of Enhancement and Scan Timing in Three-dimensional Contrast-enhanced MR Angiography Using the Elliptical Centric Phase-encoding Technique
Authors :八木下, 裕子
大越, 幸和
大久保, 真樹
内藤, 健一
井上, 智子
蔡, 篤儀
Publisher :日本放射線技術学会
Issue Date :Dec-2003
Journal Title :日本放射線技術学会雑誌
Volume :59
Issue :12
Start Page :1555
End Page :1560
ISSN :0369-4305
Description :In the present study, we quantitatively investigated the relationship between the signal intensity in a vessel and the duration of contrast enhancement as well as scan timing in 3D contrast-enhanced MR angiography using an elliptical centric phase-encoding technique. A tube phantom filled with Gd-DTPA, acting as a vessel, was taken out from the field of view during data acquisition, by using the “pause” function of our MR scanne(r GE Signa, 1.5 Tesla), thereby simulating the presence and absence of a vessel. The shortening of the duration of enhancement corresponds to the delay of scan timing from the optimal point in the phase-encoding of the centric-ordering system. The signal intensity in a vesse(l 1-5 mm in diameter)decreased as the duration of enhancement became shorter and the diameter of the vessel decreased. When the number of partitions was 16 or 32 in a 128-mm-thick slab, the signal intensity obtained by the elliptical centric phase-encoding technique was almost the same as that obtained by the conventional centric phase-encoding technique. However, when the number of partitions was increased(64-124), and if the duration of enhancement was short, the signal intensity obtained by the elliptical centric phase-encoding technique was higher than that obtained by the conventional centric phase-encoding technique. In conclusion, in terms of the duration of enhancement and the delay of scan timing, the elliptical centric phase-encoding technique is superior to the conventional centric phase-encoding technique when the number of partitions in a slab for 3D MR angiography is increased.
Keywords :Magnetic resonance angiography(MRA)
Three-dimensional contrast enhanced magnetic resonance angiography(3D-CE MRA)
Elliptical centric phase encoding
Centric phase encoding
Phase-encding order
Type Local :学術雑誌論文
Language :jpn
URI :http://hdl.handle.net/10191/4865
fullTextURL :http://dspace.lib.niigata-u.ac.jp/dspace/bitstream/10191/4865/1/jrst_59_12_1555_1560_2003.pdf
Appears in Collections:10 査読済論文 = Postprint

Please use this identifier to cite or link to this item: http://hdl.handle.net/10191/4865