Fig. 14.

Assessment of triggering methods (a ECG, b PO, c proposed method) for clinical (≤3 T) and high-field MRI (≥7 T). The gray areas represent the assessment for clinical MRI and the black areas for high-field MRI. Each value is expressed relative to the performance of both other triggering methods in its dimension and ranges linearly from poor performance (center) to best performance (outside border). The different dimensions are: accuracy (describing time difference between depolarization of the ventricles and issuance of a trigger), reliability (describing reliability independent of environment variables such as field strength, coil activity, illumination etc.), robustness (describing robustness against noise introduced by the patient such as signal loss due to decreasing perfusion, head or finger motion, or increased HRV), comfort (describing patient comfort when the method is applied), safety (describing potential safety hazards from the hardware), and set-up convenience (describing the time and effort it takes to apply the method). In this work, we have provided data that supports the statements of the figure with respect to accuracy and reliability. The statements with respect to the other dimensions, represent a subjective assessment and are based on current literature and observations made during this work