Ladder-Like Low Iodine Delivery Rate Injection Protocols Based on BMI at 70 KV by Automated Tube Voltage Selection in Coronary CTA

Figure 3

A1∼3 showed three branches of coronary artery of a female patient (162 cm, 55 kg, BMI 21,0) with the injection of 42 ml, 3.5 ml/s; white arrow means calcified plaque; CT value of aortic root is 762HU which is believed too high. B1∼3 showed a female patient in the experimental group (166 cm, 57 kg, BMI 20.69)，with a volume of 24 ml, and a speed of 2.4 ml/s. The CT value of the aortic root is 524HU with a suitable range of enhancement on three main branches. C1 and C2 are two different male patients with 165 cm and 62 kg both, injected with 42 ml and 3.5 ml/s. C1’s aortic root CT value is 711HU; tube current is 502/734 mAs; C2’s CT value is 562HU; tube current is 366/734 mAs.734 mAs is a fixed tube current reference when tube voltage is selected at 70 KV.