Hee-Won Kim1,2, Karam Souibri3, Gerald M. Pohost1,4
1Radiology, University of Southern California, Los Angeles, CA, United States; 2Cardiology, Heart and Vascular Institute, Hollywood Presbyterian Hospital, Los Angeles, CA, United States; 3Cardiology, University of Southern California, Los Angeles, CA, United States; 4Electrical Engineering, University of Southern California, Los Angeles, CA, United States
A stress control system was developed and evaluated to obtain improved precision of the stress MR studies. The stability in stress was achieved by the feed-forward or feedback control and audio-visual stimulation actuated by the error signal. The system performance was evaluated by cardiac P-31 MRS at 3T. With the control system, it was clearly demonstrated that the stress level is far more stable during the entire session and inter-subject variation in the metabolic alterations is significantly reduced. It is expected to assess cardiac function and metabolite alteration during moderate stress with higher precision by using automatic stress control system.