Efficacy of Gadoterate Meglumine in Diagnosis of Vascular Diseases Using MRA MRA

In this study, we will assess the image quality and accuracy of MRA studies acquired using these two contrast agents. In the cases where Digital Subtraction Angiography (DSA) or CT angiography images are available, the results of the study using both contrast agents will be compared to the DSA or CTA findings. All MRA images will be assessed independently by two readers. The readers will be blinded to the clinical symptoms, contrast agent and DSA/CTA results. A five-level system rating for image quality of each arterial segment will be used (1 = non-diagnostic images, 2 = poor image quality, significant blurring/artefacts, diagnosis suspected but not established, 3 = fair quality with established diagnosis, 4=good quality with definite diagnosis, minimal blurring/artefacts, 5 = sharply defined borders, excellent quality image information). Vascular lesions will also be graded on a 1-5 scale. Vessel segment stenoses will be graded using a five-point grading scale as follows: (1) normal; (2) mild (<50% diameter stenosis); (3) moderate (50% to 74%), severe (75% to 99%); and (5) total occlusion.

Grades 1 and 2 will be considered insignificant, while grades 3 to 5 will be interpreted as significant for diagnostic accuracy testing.

Inclusion criteria

• Male or female subjects 18-89 years of age
• Suspected or diagnosed vascular disease
• Standard of care carotid, chest, or
• Willingness to undergo 1 research MRA with up to double dose gadoterate meglumine
• Able to complete the MR safety questionnaire
• Able to comprehend and provide informed consent in English

Exclusion criteria

• • Allergy to gadolinium-containing contrast media

• Chronic, severe kidney disease
• eGFR < 60mL/min/1.73m2
• Acute kidney injury
• Kidney or liver transplant within 8 weeks
• Contraindication to MRI (implanted device, claustrophobia, dyspnea precluding the ability to follow breath-hold instructions)
• Pregnant or breastfeeding women
• Adults unable to consent
• Individual who are not yet adults
• Prisoners