Magnetic resonance imaging of coronary arteries

D, Li; Haacke, E. Mark; Me, Shelton; Kaushikkar, S

doi:10.1097/00019501-199505000-00003

Cited by 5 publications

(4 citation statements)

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“…Navigator echoes measuring diaphragm position have been used for respiratory gating of MRCA image acquisition and can require as much as fivefold oversampling to adequately fill k-space (17)(18)(19). Navigator gating also has been studied in conjunction with respiratory feedback or coached breathing (20).…”

Section: Discussionmentioning

confidence: 99%

Prospective adaptive navigator correction for breath‐hold MR coronary angiography

McConnell¹,

Khasgiwala²,

Savord³

et al. 1997

Magnetic Resonance in Med

205

146

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Current MR coronary angiography (MRCA) methods use breath-holding to minimize respiratory motion. A major limitation to this technique is misregistration between imaging slices due to breath-hold variability. Prospective adaptive correction of image location using real-time navigator measurement of diaphragm position is a potential method for improving slice registration in breath-hold MRCA. Ten subjects underwent MRCA using an ECG-gated, fat-suppressed, segmented k-space, gradient-echo sequence. Transverse and coronal images were acquired using standard breath-holding with and without prospective navigator correction. Breath-hold MRCA with prospective navigator correction resulted in a 47% reduction in craniocaudal slice registration error compared to standard breath-holding (0.9 +/- 0.2 mm versus 1.7 +/- 0.4 mm, P = 0.04). Prospective adaptive navigator correction of image location significantly improves slice registration for breath-hold MRCA and is a promising motion correction technique for cardiac MR.

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Section: Discussionmentioning

confidence: 99%

Prospective adaptive navigator correction for breath‐hold MR coronary angiography

McConnell¹,

Khasgiwala²,

Savord³

et al. 1997

Magnetic Resonance in Med

205

146

View full text Add to dashboard Cite

show abstract

“…Intra-patient and inter-patient heart rate variability is normalized using the following method. In a study of 121 male subjects, 15 it was determined that total electromechanical systole QS 2 (seconds) was related to heart rate HR (beats/min) by (5) In order to work with a total cardiac phase (χ) interval of [0, 1), we chose to normalize to an idealized 60 beat/min heart rate. Using Eq.…”

Section: Separating Cardiac and Respiratory Motionmentioning

confidence: 99%

“…Volumetric data simplifies the visualization of tortuous and nonplanar vessels that are difficult to capture in a planar 2D slice. 5 However, 3D MRCA requires longer imaging times during which respiratory motion can cause blurring that leads to overestimation of vessel lumen size and undetected stenoses. 6 Gating the MR acquisition to both the cardiac and respiratory cycles is one method for freezing the motion of the coronary arteries.…”

Section: Introductionmentioning

confidence: 99%

Rest period duration of the coronary arteries: Implications for magnetic resonance coronary angiography

2005

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Magnetic resonance (MR) and computed tomography coronary imaging is susceptible to artifacts caused by motion of the heart. The presence of rest periods during the cardiac and respiratory cycles suggests that images free of motion artifacts could be acquired. In this paper, we studied the rest period (RP) duration of the coronary arteries during a cardiac contraction and a tidal respiratory cycle. We also studied whether three MR motion correction methods could be used to increase the respiratory RP duration. Free breathing x-ray coronary angiograms were acquired in ten patients. The three-dimensional (3D) structure of the coronary arteries was reconstructed from a biplane acquisition using stereo reconstruction methods. The 3D motion of the arterial model was then recovered using an automatic motion tracking algorithm. The motion field was then decomposed into separate cardiac and respiratory components using a cardiac respiratory parametric model. For the proximal-to-middle segments of the right coronary artery (RCA), a cardiac RP (<1 mm 3D displacement) of 76±34 ms was measured at end systole (ES), and 65±42 ms in mid-diastole (MD). The cardiac RP was 80±25 ms at ES and 112±42 ms at MD for the proximal 5 cm of the left coronary tree. At end expiration, the respiratory RP (in percent of the respiratory period) was 26±8% for the RCA and 27±17% for the left coronary tree. Left coronary respiratory RP (<0.5 mm 3D displacement) increased with translation (32% of the respiratory period), rigid body (51%), and affine (79%) motion correction. The RCA respiratory RP using translational (27%) and rigid body (33%) motion correction were not statistically different from each other. Measurements of the cardiac and respiratory rest periods will improve our understanding of the temporal and spatial resolution constraints for coronary imaging.

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“…Nuclear medicine imaging provides both qualitative and quantitative information about regional and global cardiac function , and has been suggested to be a sensitive means to assess myocardial injury in patients with coronary artery disease (Li and Deshpande 2001;Hundley et al 2003). MRI provides assessments of myocardial wall thickness and, with delayed hyperenhancement, allows direct visualization of myocardial (2001) injury/fibrosis, and is more sensitive in assessing subendocardial injury.…”

Section: Mrimentioning

confidence: 99%

Quantitative/Objective Analyses of RT-Induced Late Normal Tissue Injury Using Functional Imaging

Nam

Robbins

Marks

2013

ALERT - Adverse Late Effects of Cancer Treatment

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Magnetic resonance imaging of coronary arteries

Cited by 5 publications

References 0 publications

Prospective adaptive navigator correction for breath‐hold MR coronary angiography

Prospective adaptive navigator correction for breath‐hold MR coronary angiography

Rest period duration of the coronary arteries: Implications for magnetic resonance coronary angiography

Quantitative/Objective Analyses of RT-Induced Late Normal Tissue Injury Using Functional Imaging

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