期刊
MAGNETIC RESONANCE IN MEDICINE
卷 50, 期 5, 页码 1100-1106出版社
JOHN WILEY & SONS INC
DOI: 10.1002/mrm.10623
关键词
variable-density spirals; tailored RF pulses; susceptibility artifacts; functional MRI; pulse sequences
资金
- NATIONAL INSTITUTE OF MENTAL HEALTH [R01MH066066, R01MH067166] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON DRUG ABUSE [R21DA015900] Funding Source: NIH RePORTER
- NIDA NIH HHS [R21 DA015900-03, 1 R21 DA015900-01, R21 DA015900] Funding Source: Medline
- NIMH NIH HHS [R01 MH067166-04, R01 MH066066-03, R01 MH067166, 1 R01 MH66066-01, R01 MH066066] Funding Source: Medline
A variable-density spiral method is presented for reducing three-dimensional tailored radiofrequency pulse duration. Pulse length reductions of 21-32% are possible, with only a small error in the desired excitation profile. The method is demonstrated using simulations, phantom experiments, and T-2(*)-weighted images of brain regions with susceptibility-induced intravoxel dephasing. Four 19.7-ms shots were needed to excite a 5-mm-thick slice with reduced susceptibility artifacts in the sinus region at 3T. Magn Reson Med 50: 1100-1106, 2003. (C) 2003 Wiley-Liss, Inc.
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