Magnetic resonance of coronary arteries

Bunce, Nicholas; Pennell, Dudley J.

doi:10.1007/s003300000680

Cited by 15 publications

(8 citation statements)

References 34 publications

(38 reference statements)

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“…Temporal and spatial resolution are critical factors regarding image quality in non-invasive MRI and EBCT coronary artery imaging [18,19]. A comparison of our results with previous studies on 3D navigator-echo-based MR coronary angiography [8,9,10,11,12,13] finds an improvement of these crucial factors over the past years.…”

Section: Discussionsupporting

confidence: 64%

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Intraindividual comparison of contrast-enhanced electron-beam computed tomography and navigator-echo-based magnetic resonance imaging for noninvasive coronary artery angiography

et al. 2002

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The aim of this study was to compare contrast-enhanced electron-beam computed tomography (EBCT) and navigator-echo-based MRI of the coronary arteries in the same patient population. Both methods were assessed for visualization of the coronary arteries and their diagnostic accuracy in identifying significant coronary artery stenoses compared with conventional coronary angiography. Twenty patients with known coronary artery disease were examined with both contrast-enhanced EBCT and a respiratory-gated MRI sequence. A grading system was used to evaluate the image quality. Sensitivity and specificity for the detection of significant coronary artery stenoses was evaluated compared with conventional coronary angiography. With EBCT, 89% of the main coronary arteries could be completely visualised in the proximal and middle segments; with MRI, 83% were visualised. With EBCT the sensitivities for identifying significant (>/=50%) stenoses in proximal and middle vessel segments were 75% in the main stem, 88% in the left anterior descending coronary artery, 75% in the left circumflex coronary artery, and 90% in the right coronary artery. Respective sensitivities for MRI angiograms were 75, 82, 75 and 80%. With both modalities a sufficient image quality of the main coronary arteries can be obtained in most cases. The diagnostic capability for detecting significant stenoses is comparable for both methods.

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Section: Discussionsupporting

confidence: 64%

“…The first results of nontechniques continue to improve, the long-term value of this technique is not yet well defined, especially in the advent of ultrafast CT coronary angiography [18,19].…”

Section: Introductionmentioning

confidence: 99%

Intraindividual comparison of contrast-enhanced electron-beam computed tomography and navigator-echo-based magnetic resonance imaging for noninvasive coronary artery angiography

et al. 2002

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“…Recently, a new strategy in MR angiography has been developed to assess thoracic aortic disease such as coarctation of the aorta, but also to image the abdominal arterial system and the coronary arteries [8,9,10,11,12]. This technique overcomes many of the problems that degrade conventional MR angiography using T1-shortening effect of dynamic paramagnetic agent to perform the vessel contrast.…”

Section: Resultsmentioning

confidence: 99%

Coarctation of the aorta: comparison of aortic dimensions between conventional MR imaging, 3D MR angiography, and conventional angiography

et al. 2002

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Magnetic resonance angiography is increasingly used as a non-invasive method in the evaluation of coarctation of the aorta. The aim of this study was to compare aortic dimensions calculated by MR angiography and those obtained by more conventional MR sequences and conventional angiography. Twenty-six consecutive patients with coarctation underwent three-dimensional MR angiography. Two independent observers retrospectively evaluated three aortic segments, site of coarctation, presence of aneurysm and existence of collateral circulation. Three aortic segments were also compared with those obtained on classical MR sequences and conventional angiography. The MR angiography was successfully performed in all showing 1 aneurysm and collateral circulation in 8 patients. Almost perfect intraobserver ( r(2)>0.91) and excellent interobserver ( r(2)>0.80) reliabilities were obtained for each aortic segment no matter which MR sequence was employed. Similarly, mainly excellent ( r(2)>0.80) concordance analysis was observed between MR angiography measurements and those calculated by either spin-echo/gradient-echo sequences or conventional angiography. This study demonstrates that MR angiography is a fast, accurate and reproducible method in the evaluation of coarctation of the aorta. It provides excellent anatomic information and reliably detects collateral vessels. Magnetic resonance angiography could probably replace the conventional angiography and will provide an additional diagnostic value in combination with turbo spin-echo sequence.

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“…Whereas smaller voxel sizes are rarely necessary in cardiac cine MRI (16,18), MR coronary angiography still lacks sufficient spatial resolution to depict the distal parts of the coronaries (19,20). Therefore, PAT may be a promising cardiac application for these purposes.…”

Section: Discussionmentioning

confidence: 99%

Parallel acquisition techniques in cardiac cine magnetic resonance imaging using TrueFISP sequences: Comparison of image quality and artifacts

Hunold

Maderwald

Ladd

et al. 2004

Magnetic Resonance Imaging

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Purpose:To compare image quality, artifacts, and signalto-noise ratio (SNR) in cardiac cine TrueFISP magnetic resonance imaging (MRI) with and without parallel acquisition techniques (PAT). Materials and Methods:MRI was performed in 16 subjects with a TrueFISP sequence (1.5 T; Magnetom Sonata, Siemens): TR, 3.0 msec; TE, 1.5 msec; flip angle (FA), 60°. Three axes were scanned without PAT (no PAT) and using the generalized autocalibrating partially parallel acquisition (GRAPPA) and modified sensitivity encoding (mSENSE) reconstruction algorithms with an autocalibration mode to reduce scan time. A conventional spine array and a body flex array were used. Artifacts, image noise, and overall image quality were classified on a 4-point scale by an observer blinded to the implemented technique; for quantitative comparison, SNR was measured. Results:With a PAT factor of two, acquisition time could be reduced by 39%. No PAT did not show artifacts, and GRAPPA revealed fewer artifacts than mSENSE. PAT provided inferior-quality scores concerning image noise and overall image quality. In quantitative measurements, GRAPPA and mSENSE (20.1 Ϯ 6.2 and 15.6 Ϯ 6.2, respectively) yielded lower SNR than no PAT (30.6 Ϯ 20.1; P Ͻ 0.05) and P Ͻ 0.001). Conclusion:Time savings in PAT are accompanied by artifacts and an increase in image noise. The GRAPPA algorithm was superior to mSENSE concerning image quality, noise, and SNR.

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Magnetic resonance of coronary arteries

Cited by 15 publications

References 34 publications

Intraindividual comparison of contrast-enhanced electron-beam computed tomography and navigator-echo-based magnetic resonance imaging for noninvasive coronary artery angiography

Intraindividual comparison of contrast-enhanced electron-beam computed tomography and navigator-echo-based magnetic resonance imaging for noninvasive coronary artery angiography

Coarctation of the aorta: comparison of aortic dimensions between conventional MR imaging, 3D MR angiography, and conventional angiography

Parallel acquisition techniques in cardiac cine magnetic resonance imaging using TrueFISP sequences: Comparison of image quality and artifacts

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