Table 2

CT Scan Parameters

Coronary CTACTP
Heart rate (beats/min)53.8 ± 7.468.4 ± 8.9
Beta-blocker use37 (93)
 Oral metoprolol37 (93)
 Intravenous metoprolol19 (48)
Beta-blocker dose, mg
 Oral metoprolol58 ± 31
 Intravenous metoprolol6 ± 11
Gantry rotations
 136 (90)22 (55)
 24 (10)18 (45)
Tube voltage, kV120 ± 0120 ± 0
Tube current, mA483 ± 58423 ± 60
Dose length product, mGy/cm379 ± 157343 ± 186
Radiation exposure, mSv4.7 ± 3.94.5 ± 1.9

Values are mean ± SD or n (%).

CT = computed tomography; CTA = computed tomography angiography; CTP = computed tomography stress myocardial perfusion imaging.

  • At time of CT image acquisition.