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3D MR DSA: effects of injection protocol and image masking
R Frayne1, T M Grist, J S Swan
1Department of Medical Physics, University of Wisconsin-Madison, Clinical Science Center, Madison, Wisconsin 53792-3252, USA. rfrayne@dcns.ucalgary.ca
Journal of Magnetic Resonance Imaging : JMRI
|September 19, 2000
Summary
Optimizing contrast agent injection protocols for three-dimensional (3D) magnetic resonance digital subtraction angiography (MR DSA) is crucial. Higher contrast volumes and shorter injection durations generally improve image quality and vascular visualization.
Area of Science:
- Medical Imaging
- Radiology
- Magnetic Resonance Imaging
Background:
- Three-dimensional (3D) magnetic resonance digital subtraction angiography (MR DSA) is a valuable non-invasive imaging technique.
- Optimizing contrast agent delivery is essential for maximizing image quality and diagnostic accuracy in MR DSA.
Purpose of the Study:
- To investigate the impact of various injection parameters on 3D MR DSA image quality.
- To evaluate the effects of contrast agent volume, injection rate, injection order, and image masking.
Main Methods:
- Ten healthy volunteers underwent pelvic MR DSA scans.
- Seven different contrast agent volume/injection rate combinations were tested.
- Precontrast mask subtraction was employed to enhance vascular contrast.
Main Results:
- Mask subtraction improved vascular contrast by 4.0 to 7.7 times.
- Higher contrast volumes (0.150 mmol kg(-1)) generally yielded superior image quality.
- Image quality and smaller vessel contrast decreased with subsequent injections.
- Injection rate had minimal impact, though ~10-second durations showed better contrast.
Conclusions:
- A protocol using escalating contrast volumes for multi-injection MR DSA examinations is proposed.
- Careful selection of injection parameters can optimize vascular visualization and diagnostic yield.
- Further research into optimal injection strategies for MR DSA is warranted.