EFFECTS OF RESPIRATORY DRIFT ON PROSPECTIVE MOTION CORRECTION FACTOR IN NAVIGATOR GUIDED CARDIAC IMAGING
Fung M, Schmidt E, Sun W, Gupta S
In prospective motion correction protocols, a patient-specific heart-diaphragm SI correction factor (HDCF) is used to correlate the motion of the diaphragm and the heart for multiple navigator-guided acquisitions. In clinical situations, however, a change in respiratory pattern, over time, is often observed. This study investigates the effects of a drift in end-expiration diaphragm position on the motion correction factor and defines a maximal extend that the end-expiratory level is allowed to change before the scan should be aborted. Results suggest that the correction factor is relatively unchanged for respiratory drifts below 3-4mm and varies greatly for larger drifts.