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Efficient bloch-siegertB_{1}$^{+}$mapping using spiral and echo-planar readouts
| Content Provider | Scilit |
|---|---|
| Author | Saranathan, Manojkumar Khalighi, Mohammad Mehdi Glover, Gary H. Pandit, Prachi Rutt, Brian K. |
| Copyright Year | 2013 |
| Description | Journal: Magnetic Resonance in Medicine The Bloch‐Siegert (B‐S) B_{1}$^{+}$ mapping technique is a fast, phase‐based method that is highly SAR limited especially at 7T, necessitating the use of long repetition times. Spiral and echo‐planar readouts were incorporated in a gradient‐echo based B‐S sequence to reduce specific absoprtion rate (SAR) and improve its scan efficiency. A novel, numerically optimized 4 ms B‐S off‐resonant pulse at + 1960 Hz was used to increase sensitivity and further reduce SAR compared with the conventional 6 ms Fermi B‐S pulse. Using echo‐planar and spiral readouts, scan time reductions of 8–16 were achieved. By reducing the B‐S pulse width by a factor of 1.5, SAR was reduced by a factor of 1.5 and overall sensitivity was increased by a factor of 1.33 due to the nearly halved resonance offset of the new B‐S pulse. This was validated on phantoms and volunteers at 7 T. Magn Reson Med 70:1669–1673, 2013. |
| Related Links | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3657582/pdf |
| Ending Page | 1673 |
| Page Count | 5 |
| Starting Page | 1669 |
| e-ISSN | 15222594 |
| DOI | 10.1002/mrm.24599 |
| Journal | Magnetic Resonance in Medicine |
| Issue Number | 6 |
| Volume Number | 70 |
| Language | English |
| Publisher | Wiley-Blackwell |
| Publisher Date | 2013-02-07 |
| Access Restriction | Open |
| Subject Keyword | Journal: Magnetic Resonance in Medicine Radiology, Nuclear Medicine and Imaging B1+ Mapping Bloch‐siegert Method Spiral Readout Echo‐planar Readout |
| Content Type | Text |
| Resource Type | Article |
