Fig. 2

Example of quality control screens of MPS acquisitions with the GE camera using the Alcyone technology. a Before starting the tomographic acquisition, a scout view is acquired that lasts 20–40 s to confirm that the patient is well positioned in the vertical axis. The images located in the first row shows that the detectors is well positioned in the three axes and includes the whole heart in the field of view. The yellow cross (right images, in the three axes) should be placed the closest to the center of the heart. The duration of this low-dose stress acquisition after injection of a ^99mTc-labeled perfusion tracer was calculated at 6 min to reach an estimated LV myocardial count set at 1 million in the region of interest placed on the cardiac region on the scout view. b During the acquisition, a histogram shows all R-R intervals included in the acquisition. Note the presence of abnormal short and long R-R intervals corresponding to extrasystolic and post-extrasystolic cardiac cycles. At the end of the acquisition, abnormal R-R intervals can be excluded from the gated reconstruction. The proportion of accepted cardiac cycles should be sufficient to preserve image quality of gated images and obtain reliable values for LVEF. c At the end of the acquisition, on the right of the screen, the final quality of the three transaxial axes should be evaluated