An optimized test bolus for computed tomography pulmonary angiography and its application at 80 kV with 10 ml contrast agent

摘要

The time-enhancement curves in control ( ) and test group ( ). The time-enhancement curves were obtained by measuring the enhancement within a region of interest in pulmonary artery and vein. The biphasic time-enhancement curves were obtained in test group ( ). There was an intersection between the two curves. In order to decrease the vein enhancement, the scan should be finished before the time at cross point. The scan delay (T ) was calculated by using the following equation: Time at cross point (T )-scan duration (T ). Line 1 was the time-enhancement curves of pulmonary artery; Line 2 was the time-enhancement curves of pulmonary artery of vein.