Table 1

Comparison of MDCT Scan Parameters

Prospectively GatedRetrospectively Gated
Scanning
 Detector collimation, mm4 × 364 × 0.5
 Tube voltage, kV120120
 Tube current, mA150400
 Gantry rotation, s0.4Variable
 Helical pitchVariable
 ECG triggering, percent of R-R interval50
 Field of view, mm120120
ReconstructionHalfSegmental
 Convulation kernelFC 43FC 43
 Percent of R-R interval5050
 Slice thickness, mm33

ECG = electrocardiographic.