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A 3-Port Traveling-Wave Antenna in Combination with TIAMO for the Acquisition of Void-Free Brain Images at 9.4 Tesla
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hoffmann, Jens Mirkes, Christian C. Shajan, G. Scheffler, Klaus Pohmann, Rolf |
| Copyright Year | 2014 |
| Abstract | Background: The original traveling-wave approach uses a remotely placed antenna to stimulate the propagation of two TE11 waveguide modes in circular polarization (CP) within a human 7 T scanner. While this approach enables large field-of-view imaging and provides free space around the subject, one major drawback is the small number of transmit/receive sensitivities (i.e. the two TE11 modes), which limits the B1 + management and parallel receive capabilities and therefore the practicability of this setup. At 9.4 T, a third waveguide mode (TM01) can be excited whose |B1 | pattern shows complementary features compared to the TE11 modes (Fig.1 A1&A2). While three antenna-channels are still insufficient to homogenize the B1 + field across larger volumes, two time-interleaved acquisitions using complementary RF shims (TIAMO) and the subsequent rooted sum-of-squares (RSS) combination of the single images may facilitate 9.4 T traveling-wave MRI of the entire brain without signal dropouts. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://cds.ismrm.org/protected/14MProceedings/files/0399.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
