期刊
MAGNETIC RESONANCE IN MEDICINE
卷 54, 期 6, 页码 1327-1332出版社
WILEY
DOI: 10.1002/mrm.20729
关键词
MRI; high field; parallel imaging; array; simulations
资金
- NCRR NIH HHS [P41 RR16105] Funding Source: Medline
- NIBIB NIH HHS [R01 EB000454, R01 EB000985] Funding Source: Medline
Image inhomogeneity related to high radiofrequencies is one of the major challenges for high field imaging. This inhomogeneity can be thought of as having 2 radiofrequency-field related contributors: the transmit field distribution and the reception field distribution. Adjusting magnitude and phase of currents in elements of a transmit array can significantly improve flip angle homogeneity at high field. Effective application of some well-known parallel imaging and other receive array post-processing methods removes receptivity patterns from the intensity distribution in the final image, though noise then becomes a function of position in the final image. Here simulations are used to show that, assuming high signal-to-noise ratio, very homogeneous images in the human head can be acquired with the combination of transmit arrays and some receive array reconstruction methods at frequencies as high as 600 MHz. Magn Reson Med 54:1327-1332,2005. (c) 2005 Wiley-Liss, Inc.
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