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A generalized slab-wise framework for parallel transmit multiband RF pulse design
| Content Provider | Scilit |
|---|---|
| Author | Wu, Xiaoping Schmitter, Sebastian Auerbach, Edward J. Uğurbil, Kâmil de Moortele, Pierre-François Van |
| Copyright Year | 2015 |
| Description | Journal: Magnetic Resonance in Medicine We propose a new slab-wise framework to design parallel transmit multiband pulses for volumetric simultaneous multislice imaging with a large field of view along the slice direction (FOVs). The slab-wise framework divides FOVs into a few contiguous slabs and optimizes pulses for each slab. Effects of relevant design parameters including slab number and transmit B1 (B1+) mapping slice placement were investigated for human brain imaging by designing pulses with global or local SAR control based on electromagnetic simulations of a 7T head RF array. Pulse design using in vivo B1+ maps was demonstrated and evaluated with Bloch simulations. RF performance with respect to SAR reduction or B1+ homogenization across the entire human brain improved with increasing slabs; however, this improvement was nonlinear and leveled off at ∼12 slabs when the slab thickness reduced to ∼12 mm. The impact of using different slice placements for B1+ mapping was small. Compared with slice-wise approaches where each of the many imaging slices requires both B1+ mapping and pulse optimization, the proposed slab-wise design framework attained comparable RF performance while drastically reducing the number of required pulses; therefore, it can be used to increase time efficiency for B1+ mapping, pulse calculation, and sequence preparation. |
| Related Links | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4654723/pdf |
| Ending Page | 1456 |
| Page Count | 13 |
| Starting Page | 1444 |
| e-ISSN | 15222594 |
| DOI | 10.1002/mrm.25689 |
| Journal | Magnetic Resonance in Medicine |
| Issue Number | 4 |
| Volume Number | 75 |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2015-05-20 |
| Access Restriction | Open |
| Subject Keyword | Journal: Magnetic Resonance in Medicine Radiology, Nuclear Medicine and Imaging High-field Mri Multiband Rf Pulse Design Parallel Excitation Simultaneous Multislice Imaging Transmit B1 Homogenization |
| Content Type | Text |
| Resource Type | Article |
