Overall diagnostic accuracy for the detection of graft patency was 95% for 64-slice vs 92% for 16-slice MDCT. By analyzing the 173 grafts by 64-slice vs 153 grafts by 16-slice MDCT that could be evaluated, sensitivity, specificity, positive predictive values (PPV) and negative predictive values (NPV) of the MDCT for visualization of graft patency were 90, 98, 90 and 98% vs 87, 97, 94 and 93% In the literature, the smallest amount of CM used for a head and neck CTA used 30 mL of high-concentration iodinated contrast medium (370 mg I/mL) with a 128-slice CT system in their protocol. However in their study a single-energy protocol was used and a mean arterial enhancement of 243.3±39.4 HU was obtained (Hinkmann et al). Although this Blount HOSP Blount Memorial Hospital Fixed No GE CT SIM 16 Slice Definition AS 128 Slice Davidson HOSP St. Thomas West Hospital Fixed No GE Lightspeed VCT 64 Slice Each detector contains 64 detector rows, each of which is 0.6 mm wide. Using the z-flying focal spot technique, two 64-channel 0.6 mm measurements are combined to create 128 “slices” of projection data along the z axis. The shortest gantry rotation time is 0.28 s. Details were obtained from approximately 90 CT examinations carried out in 128 slice CT scan of Teaching Hospital. For head CT scans, mean mAs decreased by about 47% on average from before wsik.

128 slice ct scan meaning