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A 128‐channel receive array for cortical brain imaging at 7 T.
- Source :
- Magnetic Resonance in Medicine; Dec2023, Vol. 90 Issue 6, p2592-2607, 16p
- Publication Year :
- 2023
-
Abstract
- Purpose: A 128‐channel receive‐only array for brain imaging at 7 T was simulated, designed, constructed, and tested within a high‐performance head gradient designed for high‐resolution functional imaging. Methods: The coil used a tight‐fitting helmet geometry populated with 128 loop elements and preamplifiers to fit into a 39 cm diameter space inside a built‐in gradient. The signal‐to‐noise ratio (SNR) and parallel imaging performance (1/g) were measured in vivo and simulated using electromagnetic modeling. The histogram of 1/g factors was analyzed to assess the range of performance. The array's performance was compared to the industry‐standard 32‐channel receive array and a 64‐channel research array. Results: It was possible to construct the 128‐channel array with body noise–dominated loops producing an average noise correlation of 5.4%. Measurements showed increased sensitivity compared with the 32‐channel and 64‐channel array through a combination of higher intrinsic SNR and g‐factor improvements. For unaccelerated imaging, the 128‐channel array showed SNR gains of 17.6% and 9.3% compared to the 32‐channel and 64‐channel array, respectively, at the center of the brain and 42% and 18% higher SNR in the peripheral brain regions including the cortex. For R = 5 accelerated imaging, these gains were 44.2% and 24.3% at the brain center and 86.7% and 48.7% in the cortex. The 1/g‐factor histograms show both an improved mean and a tighter distribution by increasing the channel count, with both effects becoming more pronounced at higher accelerations. Conclusion: The experimental results confirm that increasing the channel count to 128 channels is beneficial for 7T brain imaging, both for increasing SNR in peripheral brain regions and for accelerated imaging. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 07403194
- Volume :
- 90
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Magnetic Resonance in Medicine
- Publication Type :
- Academic Journal
- Accession number :
- 172437275
- Full Text :
- https://doi.org/10.1002/mrm.29798