AI Article Synopsis
- Transmit gain calibration is essential for optimizing RF power levels in MRI to achieve specific flip angles, usually automated for proton MRI but challenging for other nuclei like hyperpolarised substances.
- The study introduced a method using the Bloch-Siegert phase shift, allowing simultaneous extraction of additional data such as centre frequency, line broadening, and signal-to-noise ratio (SNR).
- This technique shows strong potential for nonproton MR applications, demonstrating effectiveness in hyperpolarised (13)C and (3)He imaging due to its T(1) and B(0) insensitivity and broad B 1+ range.
Article Abstract
Transmit gain (B 1+) calibration is necessary for the adjustment of radiofrequency (RF) power levels to the desired flip angles. In proton MRI, this is generally an automated process before the actual scan without any user interaction. For other nuclei, it is usually time consuming and difficult, especially in the case of hyperpolarised MR. In the current work, transmit gain calibration was implemented on the basis of the Bloch-Siegert phase shift. From the same data, the centre frequency, line broadening and SNR could also be determined. The T(1) and B(0) insensitivity, and the wide range of B 1+ over which this technique is effective, make it well suited for nonproton applications. Examples are shown for hyperpolarised (13)C and (3)He applications.
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| http://dx.doi.org/10.1002/nbm.1657 | DOI Listing |
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