MR angiography a suitable alternative to CT when ruling out pulmonary embolus

MRA for pulmonary embolus

Patient was found to have deep vein thrombosis. Gadolinium-enhanced MRA was performed to assess for pulmonary embolus (PE). Delayed-phase image shows cardiac chamber (star) and ascending thoracic aorta (chevron). Courtesy of AJR.

The modality switch became especially important during the iodinated contrast shortage of 2022 when clinics were forced to deploy mitigation tactics as a means of preserving their contrast supply.