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Proximal coronary artery stenosis: three-dimensional MRI with fat saturation and navigator echo
M F Müller1, M Fleisch, R Kroeker
1Department of Radiology, University of Bern, Inseispital, Switzerland.
Abstract:
The purpose of this study was to compare the diagnostic value of MR angiography (MRA) with conventional contrast angiography in coronary artery disease. Thirty-five patients underwent MRA and coronary angiography within 4 hours. Of these, three patients were investigated twice: once before and once after balloon angioplasty. The pulse sequence was a cardiac-triggered, single-slab, three-dimensional gradient-echo sequence, employing a spin-echo navigator echo measurement to track the variation of the diaphragm during the scan. The following segments of the coronary arteries were included in this prospective study: left main coronary artery, proximal and middle left anterior descending, proximal and middle left circumflex, proximal and middle right coronary artery, and intermediate branch, if present. In total, 176 segments were classified as normal or having a stenosis of less than 50% and as having a stenosis of more than 50%. Five patients were excluded because of lack of cooperation. Over all, 45 of 54 stenoses were detected and interpretable by MRA. Sensitivity, specificity, and positive and negative predictive values of MRA for detecting significant stenoses were 83%, 94%, 87%, and 93%, respectively. MRA identified significant stenoses within the major coronary arteries with a high degree of accuracy. Sensitivity and specificity are higher compared with exercise tests or scintigraphy or top of the precise localization.
Insights
MR angiography (MRA) accurately detects coronary artery disease, showing high sensitivity and specificity for significant stenoses. This non-invasive imaging offers a reliable alternative for diagnosing coronary artery blockages.
Area of Science:
- Cardiovascular Imaging
- Radiology
- Medical Diagnostics
Background:
- Coronary artery disease (CAD) diagnosis relies on invasive and non-invasive methods.
- Accurate non-invasive imaging is crucial for timely CAD management.
- Magnetic Resonance Angiography (MRA) offers potential for non-invasive coronary imaging.
Purpose of the Study:
- To evaluate the diagnostic accuracy of MR angiography (MRA) for coronary artery disease.
- To compare MRA's diagnostic value against conventional contrast angiography.
- To assess MRA's sensitivity and specificity in detecting significant coronary stenoses.
Main Methods:
- Prospective study involving 35 patients undergoing both MRA and conventional coronary angiography.
- Utilized a cardiac-triggered, 3D gradient-echo sequence with navigator echo for motion correction.
- Evaluated major coronary artery segments for stenoses (>50%).
Main Results:
- MRA detected 45 out of 54 significant stenoses.
- Achieved 83% sensitivity, 94% specificity, 87% positive predictive value, and 93% negative predictive value.
- Demonstrated high accuracy in identifying significant stenoses in major coronary arteries.
Conclusions:
- MR angiography is a highly accurate non-invasive method for diagnosing coronary artery disease.
- MRA exhibits superior sensitivity and specificity compared to functional tests like exercise or scintigraphy.
- MRA provides precise localization of coronary stenoses, aiding clinical decision-making.