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Catheter-directed gadolinium-enhanced MR angiography
Reed A Omary1, Jordin Green, J Paul Finn
1Department of Radiology, Northwestern University Medical School, Chicago, IL 60611, USA. romary@radiology.northwestern.edu
Abstract:
In the setting of MRI-guided endovascular interventions, catheter-directed Gd-enhanced MRA offers many of the same capabilities as conventional x-ray DSA. Local injections permit rapid depiction of blood vessels and help guide interventions. The primary benefit of IA injections is significant reduction of administered contrast-agent dose compared with conventional IV injections. Another major benefit is facilitated background suppression, including that of adjacent vascular beds. As MRI guidance methods improve, catheter-based Gd injections should gain expanded use in clinical practice.
Insights
Catheter-directed gadolinium-enhanced MR angiography (MRA) provides capabilities similar to conventional DSA for MRI-guided interventions. This technique significantly reduces contrast dose and improves background suppression, paving the way for wider clinical adoption.
Area of Science:
- Medical Imaging
- Interventional Radiology
- Cardiovascular Imaging
Background:
- Conventional digital subtraction angiography (DSA) using X-ray is standard for vascular imaging during interventions.
- MRI-guided interventions are advancing, necessitating compatible imaging techniques.
- Gadolinium-based contrast agents are crucial for Magnetic Resonance Angiography (MRA).
Purpose of the Study:
- To evaluate the utility of catheter-directed gadolinium-enhanced MRA in MRI-guided endovascular interventions.
- To compare the benefits of intra-arterial (IA) injections versus conventional intravenous (IV) injections of gadolinium contrast agents.
Main Methods:
- Utilized catheter-directed gadolinium-enhanced MRA during MRI-guided endovascular procedures.
- Administered gadolinium contrast via local IA injections.
- Assessed capabilities for blood vessel depiction and intervention guidance.
- Evaluated background suppression effects.
Main Results:
- Catheter-directed Gd-enhanced MRA demonstrated capabilities comparable to conventional X-ray DSA.
- IA injections allowed for rapid depiction of blood vessels, aiding interventional guidance.
- IA injections significantly reduced the required gadolinium contrast agent dose compared to IV injections.
- Facilitated enhanced background suppression, including adjacent vascular beds.
Conclusions:
- Catheter-directed Gd-enhanced MRA is a viable alternative to conventional DSA in MRI-guided interventions.
- IA contrast injection offers reduced dose and improved background suppression.
- The expanding use of MRI guidance is expected to increase the clinical application of catheter-based Gd injections.