Sound Level Measurements in MR Scanners: A Comparative Study.
Gorny K, Lanners D, Bernstein M
We report results of high precision sound level measurements carried out at our site in clinical GE 1.5T and 3T, short and long bore MR scanners. The measurements were performed for typical quiet (i.e., conventional spin echo), and the loud FIESTA pulse sequences. We observe an unexpectedly large noise increase on 3T relative to 1.5T short bore scanners. In contrast, small noise level changes were observed in 3 and 1.5T long bore scanners. We speculate that the significant noise increase in 3T short bore scanners may be caused by less efficient vacuum isolation on that system.