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Background suppression using magnetization preparation for contrast-enhanced MR projection angiography.
C Bos1, C J Bakker, M A Viergever
1Department of Radiology, Image Sciences Institute, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands. C.Bos@azu.nl
Magnetic Resonance in Medicine
|July 10, 2001
Summary
Magnetization preparation improves MR angiography contrast by saturating background tissue. This technique enhances vessel conspicuity and signal ratio without needing subtraction, aiding in contrast arrival detection.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Medical Imaging Techniques
Background:
- Contrast-enhanced MR projection angiography relies on T(1)-weighted signal difference between blood and tissue.
- Slice-selective excitation pulses cause imperfect background signal saturation, reducing vessel conspicuity.
Purpose of the Study:
- To enhance T(1)-weighted contrast between blood and background tissue in MR angiography.
- To improve vessel conspicuity by suppressing background signal.
Main Methods:
- Utilized nonselective magnetization preparation pulses prior to imaging.
- Optimized prepulse angle (110-130 degrees) and delay time (20-25 ms).
- Evaluated technique using analytical calculations, in vitro experiments, and a pig model.
Main Results:
- Magnetization preparation effectively saturated background tissue, improving slice weighting.
- Achieved enhanced contrast between contrast-enhanced blood and background tissues.
- Demonstrated a threefold increase in vessel-to-background signal ratio.
- Eliminated the need for subtraction imaging.
Conclusions:
- Magnetization preparation is an effective method to enhance MR angiography contrast and vessel conspicuity.
- The technique improves signal-to-noise ratio and simplifies imaging protocols.
- Applicable to projection MRA, contrast arrival detection, and bolus tracking.