Quadrature coil design for high‐resolution carotid artery imaging scores better than a dual phased‐array coil design with the same volume coverage

Ouhlous, Mohamed; Moelker, Adriaan; Flick, Herman; Wielopolski, Piotr A.; Weert, Thomas T. de; Pattynama, Peter M. T.; Lugt, Aad van der

doi:10.1002/jmri.20894

Cited by 13 publications

(11 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In 2007, Ouhlous et al . demonstrated that a quadrature coil, consisting of a circular single-loop sandwiched by a butterfly loop, outperformed the 4-channel design in terms of SNR at 3 cm depth [21]. Afterwards, Balu et al .…”

Section: Introductionmentioning

confidence: 99%

Comparison of four MR carotid surface coils at 3T

et al. 2019

View full text Add to dashboard Cite

Background The quality of carotid wall MRI can benefit substantially from a dedicated RF coil that is tailored towards the human neck geometry and optimized for image signal-to-noise ratio (SNR), parallel imaging performance and RF penetration depth and coverage. In last decades, several of such dedicated carotid coils were introduced. However, a comparison of the more successful designs is still lacking. Objective To perform a head-to-head comparison over four dedicated MR carotid surface coils with 4, 6, 8 and 30 coil elements, respectively. Material and methods Ten volunteers were scanned on a 3T scanner. For each subject, multiple black-blood carotid vessel wall images were measured using the four coils with different parallel imaging settings. The performance of the coils was evaluated and compared in terms of image coverage, penetration depth and noise correlations between elements. Vessel wall of a common carotid section was delineated manually. Subsequently, images were assessed based on vessel wall morphology and image quality parameters. The morphological parameters consisted of the vessel wall area, thickness, and normalized wall index (wall area/total vessel area). Image quality parameters consisted of vessel wall SNR, wall-lumen contrast-to-noise ratio (CNR), the vessel g-factor, and CNR index ((wall–lumen signal) / (wall+lumen signal)). Repeated measures analysis of variance (rmANOVA) was applied for each parameter for the averaged 10 slices for all volunteers to assess effect of coil and SENSE factor. If the rmANOVA was significant, post-hoc comparisons were conducted. Results No significant coil effect were found for vessel wall morphological parameters. SENSE acceleration affected some morphological parameters for 6- and 8-channel coils, but had no effect on the 30-channel coil. The 30-channel coil achieved high acceleration factors (10x) with significantly lower vessel g-factor values ( p s ≤ 0.01), but lower vessel wall SNR and CNR values ( p s ≤ 0.01). Conclusion All four coils were capable of high-quality carotid MRI. The 30-channel coil is recommended when rapid image acquisition acceleration is required for 3D measurements, whereas 6- and 8-channel coils demonstrated the highest SNR performance.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparison of four MR carotid surface coils at 3T

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Phased‐array (PA) surface coils specifically designed for carotid imaging have been shown to provide improved SNR at the carotid bifurcation (16–18). These studies have demonstrated the superiority of PA coils and identified favorable coil element geometries.…”

mentioning

confidence: 99%

Improvements in carotid plaque imaging using a new eight‐element phased array coil at 3T

Balu

Yarnykh

Scholnick

et al. 2009

Magnetic Resonance Imaging

View full text Add to dashboard Cite

Purpose: To design and compare an eight-channel phased array (PA) coil for carotid imaging to an established fourchannel PA design at 3T. Materials and Methods:An eight-channel PA (8PA) coil was designed specifically for imaging the carotid bifurcation and compared with the existing four-channel (4PA) design using a phantom and by in vivo black-blood magnetic resonance imaging (MRI). The 8PA and 4PA were compared in terms of coverage, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR). Results:The 8PA showed up to 1.7-fold improvement in SNR at a depth of 3.5 cm and greater longitudinal coverage at a given SNR on a phantom. The 8PA showed improved vessel wall SNR for high spatial resolution (0.63 mm 2 ) PD, T1, and T2 (1.7, 1.7, 1.6 times, respectively; P Յ 0.002) and improved CNR (1.7, 1.6, 1.5 times, respectively; P Յ 0.002). Ultrahigh-resolution (0.27 mm 2 ) T1-weighted images showed better SNR and CNR (1.4 times, P Յ 0.0001) on 8PA compared to 4PA. Conclusion:Carotid imaging studies may benefit from the improved SNR and larger coverage provided by use of the 8PA.

show abstract

“…Thus coil design has been an area of significant effort [50-53]. The recent push for increased numbers of receivers in MRI scanners has opened the door for coil designs with large numbers of elements [54].…”

Section: Imaging Technologymentioning

confidence: 99%

Advanced Techniques for MRI of Atherosclerotic Plaque

Kerwin

Cantón

2009

Topics in Magnetic Resonance Imaging

View full text Add to dashboard Cite

This review examines the state of the art in vessel wall imaging by MRI with an emphasis on the biomechanical assessment of atherosclerotic plaque. Three areas of advanced techniques are discussed. First, alternative contrast mechanisms, including susceptibility, magnetization transfer, diffusion and perfusion, are presented in regards to how they facilitate accurate determination of plaque constituents underlying biomechanics. Second, imaging technologies, including hardware and sequences, are reviewed in regards to how they provide the resolution and SNR necessary for determining plaque structure. Finally, techniques for combining MRI data into an overall assessment of plaque biomechanical properties, including wall shear stress and internal plaque strain, are presented. The paper closes with a discussion of the extent to which these techniques have been applied to different arteries commonly targeted by vessel wall MRI.

show abstract

Quadrature coil design for high‐resolution carotid artery imaging scores better than a dual phased‐array coil design with the same volume coverage

Cited by 13 publications

References 12 publications

Comparison of four MR carotid surface coils at 3T

Comparison of four MR carotid surface coils at 3T

Improvements in carotid plaque imaging using a new eight‐element phased array coil at 3T

Advanced Techniques for MRI of Atherosclerotic Plaque

Contact Info

Product

Resources

About