期刊
MAGNETIC RESONANCE IN MEDICINE
卷 57, 期 5, 页码 842-847出版社
JOHN WILEY & SONS INC
DOI: 10.1002/mrm.21221
关键词
brain imaging; B-1 inhomogeneity; transmit SENSE; parallel transmitters; tailored RF pulses
资金
- NIDA NIH HHS [R21 DA015900, R21DA015900, R21 DA015900-03] Funding Source: Medline
- NIMH NIH HHS [R01MH66066, R01 MH066066] Funding Source: Medline
Parallel transmitter techniques are a promising approach for reducing transmitter B, inhomogeneity due to the potential for adjusting the spatial excitation profile with independent RF pulses. These techniques may be further improved with transmit sensitivity encoding (SENSE) methods because the sensitivity information in pulse design provides an excitation that is inherently compensated for transmitter B, inhomogeneity. This paper presents a proof of this concept using transmit SENSE 313 tailored RIP pulses designed for small flip angles. An eight channel receiver coil was used to mimic parallel transmission for brain imaging at 3T. The transmit SENSE pulses were based on the fast-k(z) design and produced 5-mm-thick slices at a flip angle of 30 degrees with only a 4.3-ms pulse length. It was found that the transmit SENSE pulses produced more homogeneous images than those obtained from the complex sum of images from all receivers excited with a standard RF pulse.
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