Abstract #0218

Wild J, Teh K, de Zanche N

In this work, radiation-damping effects were investigated with a birdcage resonator with samples of hyperpolarized 3He at 1.5T. To our knowledge this is the first report of radiation damping in a birdcage resonator with samples hyperpolarized or otherwise. This experimental observation of radiation damping could help shed light on the meaning and definition of the filling factor for a birdcage resonator, and its relationship with the quality factor. The presence and diagnosis of radiation damping in HP gas MR also has major implications in RF calibration experiments in HP gas MRI, where accurate knowledge of the flip angle is imperative.