Fat-suppressed breath-hold magnetic resonance coronary angiography.

Manning, W. J.; Li, Wei; Boyle, N. G.; Edelman, Robert R.

doi:10.1161/01.cir.87.1.94

Cited by 228 publications

(64 citation statements)

References 28 publications

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“…Although this study was preliminary, the overall sensitivity, specificity, and accuracy of hemodynamically significant stenosis were 80%, 85%, and 84%, respectively, which are comparable to those reported previously (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14).…”

Section: Discussionsupporting

confidence: 87%

“…Magnetic resonance coronary angiography (MRCA) has been evaluated by many authors since the late 1980s (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). Electrocardiography (ECG)-gated breath-hold and navigator-echo guided data acquisition have been evaluated to overcome image blurring due to cardiac and respiratory motion during the relatively long MR data acquisition process.…”

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confidence: 99%

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High‐resolution selective three‐dimensional magnetic resonance coronary angiography with navigator‐echo technique: Segment‐by‐segment evaluation of coronary artery stenosis

Watanabe

Nagayama

Amoh

et al. 2002

Magnetic Resonance Imaging

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Purpose:To investigate the feasibility of high-resolution selective three-dimensional (3D) magnetic resonance coronary angiography (MRCA) in the evaluation of coronary artery stenoses. Materials and Methods:In 12 patients with coronary artery stenoses, MRCA of the coronary artery groups, including the coronary segments with stenoses of 50% or greater based on conventional x-ray coronary angiography (CAG), was performed with double-oblique imaging planes by orienting the 3D slab along the major axis of each right coronary artery-left circumflex artery (RCA-LCX) group and each left main trunk-left anterior descending artery (LMT-LAD) group. Ten RCA-LCX and five LMT-LAD MR angiograms were obtained, and the results were compared with those of conventional x-ray angiography.Results: Among 70 coronary artery segments expected to be covered, a total of 49 (70%) segments were fully demonstrated in diagnostic quality. The identification of segmental location of stenoses showed as high an accuracy as 96%. The retrospective analysis for stenosis of 50% or greater yielded the sensitivity, specificity, and accuracy of 80%, 85%, and 84%, respectively. Conclusion:Selective 3D MRCA has the potential for segment-by-segment evaluation of major portions of the right and left coronary arteries with high accuracy. THE DESIRE TO REPLACE CONVENTIONAL x-ray coronary angiography (CAG) by a less invasive imaging method is commonplace. Magnetic resonance coronary angiography (MRCA) has been evaluated by many authors since the late 1980s (1-16). Electrocardiography (ECG)-gated breath-hold and navigator-echo guided data acquisition have been evaluated to overcome image blurring due to cardiac and respiratory motion during the relatively long MR data acquisition process. Many imaging strategies have focused on the detection and quantification of the stenoses of only the proximal coronary arteries, but detection and quantification of the stenoses still remain unreliable (4,8,12,15).Transaxial sections used in those studies usually cover only the proximal segments of the major coronary arteries (8,12). However, not only the proximal coronary arteries, but also the mid and distal coronary arteries can be involved in the ischemic heart diseases. If all of the coronary arteries are covered with the transaxial imaging plane (12)(13)(14), the imaging time would be prolonged in association with large volume acquisition, and the right coronary artery could not be obtained with high spatial resolution because it runs in the through-plane direction. Thus, by orienting the threedimensional (3D) imaging slab along the major axis of the coronary vessels, coronary coverage can be more optimal with smaller imaging volumes (16). Recently, some investigators have used axial orientations for the left main trunk (LMT), proximal and mid left anterior descending artery (LAD), and proximal left circumflex artery (LCX), and oblique orientations for the right coronary artery (RCA) (17,18). However, two double-oblique scan volumes, when oriented along the atrioventri...

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Section: Discussionsupporting

confidence: 87%

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confidence: 99%

High‐resolution selective three‐dimensional magnetic resonance coronary angiography with navigator‐echo technique: Segment‐by‐segment evaluation of coronary artery stenosis

Watanabe

Nagayama

Amoh

et al. 2002

Magnetic Resonance Imaging

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“…While a single-slice approach yielded promising results in experienced hands (15), one of its limitations is a restricted spatial coverage. Further, a multislice approach is expected to perform more robustly in patients unable to perform reproducible breath holds.…”

Section: Discussionmentioning

confidence: 99%

Multislice breath‐hold spiral magnetic resonance coronary angiography in patients with coronary artery disease: Effect of intravascular contrast medium

Knuesel

Nanz

Wolfensberger

et al. 2002

Magnetic Resonance Imaging

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Purpose: First, to apply a breath-hold multislice 2D spiral magnetic resonance (MR) approach in patients acquiring within 16 heartbeats (acquisition window, 116 msec) a 10-mm-thick stack of four slices (resolution, 1.3 ϫ 1.3 mm 2 ); and second, to evaluate the effect of an intravascular Fe-based contrast medium (CM) on a signal-to-noise ratio (SNR) and a contrast-to-noise ratio (CNR). Materials and Methods:In each patient one or two coronary arteries were imaged prior to and following cumulative doses of 0.25, 0.5, and 0.75 mg of Fe/kg of body weight (bw) of an intravascular CM (CLARISCAN™, Nycomed-Amersham, Princeton, NJ, USA) containing ultrasmall superparamagnetic iron oxide (USPIO) particles. Results:On precontrast maximum intensity projection (MIP) images generated from the stack of slices, 10 and 11 stenoses of 12 stenoses confirmed by coronary angiography were detected by readers 1 and 2, respectively. SNR and CNR in the coronary arteries peaked at 0.50 mg of Fe/kg of bw, yielding a slight increase of 15.5% and 18.4%, respectively (P Ͻ 0.05 vs. precontrast), which did not improve detection of coronary artery stenoses. Conclusion:The presented multislice spiral approach allows display of coronary anatomy in MIP formats for convenient display of coronary stenoses. The pulse sequence did not benefit from an intravascular USPIO-based CM, since little improvement in SNR and CNR was achieved.

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“…The adverse impact of breathing-induced myocardial bulk motion can be minimized by the use of breathholding (1)(2)(3)(4)(5) or by the application of respiratory gating with MR navigators (6 -12). Further refinements in navigator technology have included prospective adaptive motion correction (9,10) in conjunction with navigator displacement-dependent 2D reordering of the acquired k yprofiles in k-space (13,14).…”

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confidence: 99%

Motion artifact reduction and vessel enhancement for free‐breathing navigator‐gated coronary MRA using 3D k‐space reordering

Huber

Hengesbach

Botnar

et al. 2001

Magnetic Resonance in Med

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Breathing-induced bulk motion of the myocardium during data acquisition may cause severe image artifacts in coronary magnetic resonance angiography (MRA). Current motion compensation strategies include breath-holding or free-breathing MR navigator gating and tracking techniques. Navigator-based techniques have been further refined by the applications of sophisticated 2D k-space reordering techniques. A further improvement in image quality and a reduction of relative scanning duration may be expected from a 3D k-space reordering scheme. Therefore, a 3D k-space reordered acquisition scheme including a 3D navigator gated and corrected segmented kspace gradient echo imaging sequence for coronary MRA was implemented. This new zonal motion-adapted acquisition and reordering technique ( Coronary MR angiography (MRA) image quality is heavily dependent on the suppression of breathing-related motion artifacts. The adverse impact of breathing-induced myocardial bulk motion can be minimized by the use of breathholding (1-5) or by the application of respiratory gating with MR navigators (6 -12). Further refinements in navigator technology have included prospective adaptive motion correction (9,10) in conjunction with navigator displacement-dependent 2D reordering of the acquired k yprofiles in k-space (13,14).k-Space reordering techniques take advantage of the inhomogeneous signal distribution in k-space, with highest signal amplitudes in the origin of k-space and gradually decreasing information content in the periphery of k-space (15). However, high-frequency portions of k-space may still contain information relevant to small-diameter structures, such as the coronary arteries. Based on this a priori knowledge, the priority of lines in k-space can be defined by a problem-specific priority function. One such application, among other techniques (6,13,14,16), is motionadapted gating (MAG) for navigator displacement-dependent reordering of k y -profiles in k-space (13). With MAG, "important" profiles are acquired during a small diaphragmatic displacement while profiles of "lesser importance" are subject to broader or larger displacement conditions. Planar 2D phase-reordering methods in 3D coronary MRA minimize respiratory motion artifacts and increase scan efficiency (14). However, these 3D acquisition techniques solely include reordering of the k-space in two dimensions (k x and k y ). We hypothesized that a "true" 3D k-space reordering in conjunction with a 3D imaging approach would lead to further improvements in respiratory motion suppression and a reduction in the relative scanning time.The present study describes a prospective navigatorbased 3D k-space reordering technique. This zonal motionadapted acquisition and reordering technique (ZMART) was developed using simulations of the Bloch equations, and has been validated in phantom and in vivo experiments. Image data were objectively and quantitatively compared, and the preliminary in vivo results are presented. METHODS k-Space ReorderingA prospective adaptive reordering o...

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Fat-suppressed breath-hold magnetic resonance coronary angiography.

Abstract: Breath-hold MR coronary angiography provides visualization of the major epicardial vessels. In the future, MR coronary angiography may provide a noninvasive means for the evaluation of patients with known or suspected coronary artery disease.

Cited by 228 publications

References 28 publications

High‐resolution selective three‐dimensional magnetic resonance coronary angiography with navigator‐echo technique: Segment‐by‐segment evaluation of coronary artery stenosis

High‐resolution selective three‐dimensional magnetic resonance coronary angiography with navigator‐echo technique: Segment‐by‐segment evaluation of coronary artery stenosis

Multislice breath‐hold spiral magnetic resonance coronary angiography in patients with coronary artery disease: Effect of intravascular contrast medium

Motion artifact reduction and vessel enhancement for free‐breathing navigator‐gated coronary MRA using 3D k‐space reordering

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