Table 2:

Comparison between MR and CT for spinal cord angiography application

ItemMR AngiographyCT Angiography
Efficacy for AKA detectionHigh, ≤100 %High, ≤100 %
Validation with catheter angiographyRealized in patients suspected of spinal vascular disease27To be demonstrated
Differentiation of inlet artery from outlet veinPossible with dynamic multiphase imagingNot demonstrated yet, may require table movement
Anatomy (vertebrae)Second phase requiredAdequately covisualized
Voxel sizeIn-plane, 0.8 × 0.8 mm, Section thickness, 1.2 mmIn-plane, 0.34 × 0.34 mm, Collimation width, 0.6 mm
Spatial coverageStandard T5 to L5, craniocaudal FOV ≤50 cm, other directions (AP or RL) limitedEntire spine is possible
Scan duration (ie, temporal resolution)Down to 8 seconds, with limited spatial coverage25Down to 6.5 seconds, with large spatial coverage45
Patient sizeIndependent image qualityContrast-to-noise of vessels decreases for corpulent patients45
SafetyVery small risk of NSF due to Gd-based contrast agent; reduces fluoroscopy time and iodinated contrast volume in subsequent catheter angiographyIonizing radiation, potentially nephrotoxic contrast agent
Contrast agent0.2–0.3 mmol Gd-chelate/kg40–150 mL iodine compound
Exam time30–45 minutes10–15 minutes
LogisticsScheduling required for TAAA patients; MR imaging is already part of diagnosis in patients suspected for spinal cord vascular lesionsAlready part of preclinical work-up in TAAA patients
  • Note:—AKA indicates Adamkiewicz artery; T5, fifth thoracic vertebral level; L5, fifth lumbar vertebral level; AP, anteroposterior; RL, right-left; TAAA, thoracoabdominal aortic aneurysm; NSF, nephrogenic sclerotic fibrosis; Gd, gadolinium.