Three-Dimensional Coronary MR Angiography Performed with Subject-Specific Cardiac Acquisition Windows and Motion-Adapted Respiratory Gating
| Autor: | Mohan U. Sivananthan, Sven Plein, Tim R. Jones, John P. Ridgway |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Male
Image quality Respiratory gating Magnetic Resonance Imaging Cine Coronary Disease Image processing Gating Coronary Angiography Sensitivity and Specificity Imaging Three-Dimensional Heart Rate Predictive Value of Tests Image Processing Computer-Assisted medicine Humans Radiology Nuclear Medicine and imaging Prospective Studies medicine.diagnostic_test Cardiac cycle business.industry Mr angiography Window (computing) General Medicine Middle Aged Coronary Vessels Myocardial Contraction Angiography Female Nuclear medicine business Magnetic Resonance Angiography |
| Zdroj: | American Journal of Roentgenology. 180:505-512 |
| ISSN: | 1546-3141 0361-803X |
| Popis: | In coronary MR angiography, data are conventionally accepted in only short and fixed periods of the cardiac and respiratory cycles. We hypothesized that a more flexible and subject-specific approach to cardiac and respiratory gating may shorten scanning times while maintaining image quality.We implemented an acquisition technique that uses subject-specific acquisition windows in the cardiac cycle and a motion-adapted gating window for respiratory navigator gating. Cardiac acquisition windows and trigger delays were determined individually from a coronary motion scan. Motion-adapted gating used a 2-mm acceptance window for the central 35% of k-space and a 6-mm window for the outer 65% of k-space. In 10 subjects, three-dimensional coronary MR angiograms of the right and left coronary systems were acquired with this technique (the "adaptive technique") as well as a conventional acquisition method, and the scanning times and image quality were compared. The adaptive technique was then applied prospectively to 40 patients who underwent coronary radiographic angiography.Scanning times with the adaptive technique were reduced by a factor of 2.3 for the right coronary artery and by a factor of 2.2 for the left coronary artery system compared with the conventional technique, mainly because we were able to use longer subject-specific acquisition windows in patients with low heart rates. Subjective and objective measurements of image quality showed no significant differences between the two techniques. Prospective evaluation of MR angiograms yielded a sensitivity and specificity of 74.3% and 88.2%, respectively, to detect significant coronary artery stenoses.Coronary MR angiography with subject-specific acquisition windows and motion-adapted respiratory gating reduces scanning times while maintaining image quality and provides high diagnostic accuracy for the detection of coronary artery stenosis. |
| Databáze: | OpenAIRE |
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