1. CT Angiography of the Aorta: Contrast Timing by Using a Fixed versus a Patient-specific Trigger Delay
In 108 participants undergoing CT angiography of the aorta, the calculated trigger delay time after bolus tracking for peak arterial enhancement varied between 6.4 and 11.3 seconds.
Patient-specific individualized trigger delay in CT angiography of the aorta led to higher attenuation (486 HU vs 438 HU; P < .001), more consistent enhancement, and improved subjective image quality (excellent or good image quality, 100% vs 67%; P < .001) compared with scan timing with a fixed and predefined trigger delay.
In a 63-year-old with untreated infrarenal aortic aneurysm, CT angiography with individualized trigger delay in coronal maximum intensity projection and cinematic rendering. Stable attenuation along aortic and iliac path was rated as excellent image quality by both readers.
Hinzpeter R et al.  Published Online: Mar 5, 2019