Characterization and suppression techniques for degree of radiation damping in inversion recovery measurements

摘要

Radiation damping (RD) has been shown to affect T1 measurement in inversionrecovery experiments. In this work, we demonstrate that the extent of RDdepends upon the T1 of the sample. RD difference spectroscopy (RADDSY) is usedto characterize the severity of RD, while gradient inversion recovery (GIR) isused for RD suppression in T1 measurements. At 9.4 T, for the radiation dampingcharacteristic time (Trd) of 50 ms, these investigations show non-negligible RDeffects for T1 values greater than Trd, with severe distortions for T1 longerthan about 150 ms, showing reasonable agreement with the predicted Trd. We alsoreport a discrepancy between published expressions for the characteristic RDtime.