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MR angiography with three-dimensional MR digital subtraction angiography
R Frayne1, T M Grist, F R Korosec
1Department of Medical Physics, University of Wisconsin-Madison, USA.
Topics in Magnetic Resonance Imaging : TMRI
|December 1, 1996
Summary
We developed a new 3D MR digital subtraction angiography (DSA) technique. This advanced imaging method improves MR angiogram quality by tracking contrast agent passage, reducing toxicity, and minimizing motion artifacts for better vascular visualization.
Area of Science:
- Medical Imaging
- Radiology
- Cardiovascular Imaging
Background:
- Magnetic resonance (MR) angiography is crucial for visualizing blood vessels.
- Conventional digital subtraction angiography (DSA) and computed tomography (CT) angiography have limitations including toxic contrast agents and motion artifacts.
- Optimizing MR angiography techniques is essential for improved diagnostic accuracy.
Purpose of the Study:
- To introduce and evaluate a novel time-resolved, contrast-enhanced, volume-imaging technique for MR angiography.
- To demonstrate the advantages of three-dimensional (3D) MR digital subtraction angiography (DSA) over existing methods.
- To assess the impact of the new technique on image quality, contrast agent safety, and artifact reduction.
Main Methods:
- Development of a time-resolved, contrast-enhanced, three-dimensional (3D) MR digital subtraction angiography (DSA) technique.
- Acquisition of full volume datasets with imaging at 2-6 second intervals.
- Application of temporal processing schemes including mask mode subtraction, matched filtering, and Eigen filtering.
Main Results:
- The 3D MR DSA technique significantly improves MR angiogram quality by imaging contrast agent passage.
- Reduced toxicity of the contrast agent compared to DSA and CT angiography.
- Minimized motion artifacts due to time-resolved imaging and temporal aperture.
- Insensitivity to variations in contrast bolus shape and timing.
- Improved signal-to-noise ratio (SNR) and ability for reformatting and reprojection.
Conclusions:
- Three-dimensional (3D) MR digital subtraction angiography (DSA) offers significant advancements in MR angiography.
- Advantages include improved SNR, flexible scan orientation, uniform vascular signal, motion artifact minimization, and enhanced postprocessing capabilities.
- This technique represents a substantial improvement for vascular imaging, offering a safer and more versatile alternative.