Fast spin echo imaging of carotid artery dynamics

Boesen, Mari E.; Neto, Luis A. Souto Maior; Pulwicki, Alexandra; Yerly, Jérôme; Frayne, Richard

doi:10.1002/mrm.25494

Cited by 9 publications

(6 citation statements)

References 22 publications

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“…In this view, a center-out ordering acquires low-frequency k-space samples at early echo times and high-frequency k-space samples at later echo times, which is not incoherent with respect to the temporal coefficients. An incoherent sampling approach that fits the signal distribution relies on randomized sampling in k-space and in time (41, 48). Figure 3b depicts an alternative view ordering scheme, in which echo trains are formed by randomly selecting phase encodes throughout k-space.…”

Section: Theorymentioning

confidence: 99%

T₂ shuffling: Sharp, multicontrast, volumetric fast spin‐echo imaging

Tamir

Uecker

Chen

et al. 2016

Magnetic Resonance in Med

162

306

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Purpose A new acquisition and reconstruction method called T2 Shuffling is presented for volumetric fast spin-echo (3D FSE) imaging. T2 Shuffling reduces blurring and recovers many images at multiple T2 contrasts from a single acquisition at clinically feasible scan times (6 to 7 minutes). Theory and Methods The parallel imaging forward model is modified to account for temporal signal relaxation during the echo train. Scan efficiency is improved by acquiring data during the transient signal decay and by increasing echo train lengths without loss in SNR. By (1) randomly shuffling the phase encode view ordering, (2) constraining the temporal signal evolution to a low-dimensional subspace, and (3) promoting spatio-temporal correlations through locally low rank regularization, a time series of virtual echo time images is recovered from a single scan. A convex formulation is presented that is robust to partial voluming and RF field inhomogeneity. Results Retrospective under-sampling and in vivo scans confirm the increase in sharpness afforded by T2 Shuffling. Multiple image contrasts are recovered and used to highlight pathology in pediatric patients. A proof-of-principle method is integrated into a clinical musculoskeletal imaging workflow. Conclusion The proposed T2 Shuffling method improves the diagnostic utility of 3D FSE by reducing blurring and producing multiple image contrasts from a single scan.

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Section: Theorymentioning

confidence: 99%

T₂ shuffling: Sharp, multicontrast, volumetric fast spin‐echo imaging

Tamir

Uecker

Chen

et al. 2016

Magnetic Resonance in Med

162

306

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“…The idea of applying CS to TSE acquisitions has been previously explored in the area of fast T 2 mapping, 32 diffusion spectrum imaging (DSI), 33 diffusion tensor imaging (DTI), 34 and CINE imaging. 35 In this work, we performed systematic optimization of dynamic sparse sampling scheme to TSE acquisition for the direct applications to 2D DCE-MRI, including subsecond (0.96 sec) kidney feeding AIF measurements in C57BL/6 mice (n 5 22). The benefits of CS-TSE acquisition for DCE-MRI applications from the results of this investigation include 1) enhanced temporal resolution without compromising slice coverage with respect to conventional TSE acquisition; 2) calibration-free estimation of Gd concentration; and 3) improved contrast enhancements over FLASH acquisitions.…”

Section: Discussionmentioning

confidence: 99%

Temporal resolution improvement of calibration‐free dynamic contrast‐enhanced MRI with compressed sensing optimized turbo spin echo: The effects of replacing turbo factor with compressed sensing accelerations

Han

Cho

2015

Magnetic Resonance Imaging

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Purpose: To enhance the temporal resolution of calibration-free dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) by implementing compressed sensing assisted turbo spin echo (CS-TSE) acquisition. Materials and Methods: The dynamic sparse sampling variables including acceleration factor, randomized phase encoding distributions, and reconstruction constraints were retrospectively optimized by minimizing the difference from fully sampled dynamic TSE at 7T. The degree of contrast enhancement and the calibration-free quantification of gadolinium (Gd) concentration were evaluated among fast low-angle shot (FLASH), TSE, and CS-TSE acquisitions with multiple phantoms (0.1-6 mM). The kidney-feeding in vivo arterial input function (AIF) was measured at multiple administration doses (0.1-0.3 mmol/kg) to evaluate the benefit of CS-TSE for quantifying rapidly changing high Gd concentrations in C57BL/6 mice (n 5 22). Results: In phantom studies, both calibration-free and calibrated conversions estimated equivalent Gd concentrations for CS-TSE (scatterplot slope 5 0.9801, r 2 5 0.9998, P < 0.001). In in vivo studies, 4-fold higher temporal resolution (0.96 sec) of CS-TSE over the corresponding TSE enabled robust measurement of AIF first-pass peak and resulting peak enhancement with CS-TSE were observed, with 1.1439-and 2.1258-fold times higher than those with TSE and FLASH acquisitions, respectively, at the 0.1 mmol/kg dose. Calibration-free estimates of AIF peak concentration with CS-TSE were in good agreement with the calibrated approach at multiple administration doses (scatterplot slope 5 0.7800, r 2 5 0.8014, P < 0.001). Conclusion: Temporal resolution-improved CS-TSE provides practical subsecond (0.96s) calibration-free dynamic MR quantification of high Gd concentration.

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“…This paper describes the development of a free-breathing black-blood CINE FSE method for measuring abdominal aortic wall motion. Recently, CINE FSE sequences have combined variabledensity sampling with advanced reconstruction methods (Boesen et al , 2015;Mendes et al , 2011) to perform black blood CINE imaging of the carotid artery. This study implemented a similar variabledensity sampling strategy (Boesen et al , 2015;Mendes et al , 2011) to allow efficient acquisitions, together with inner volume excitation (Feinberg et al , 1985) and improved blood suppression to allow free-breathing black-blood CINE FSE of the abdominal aorta.…”

Section: Introductionmentioning

confidence: 99%

Free-breathing black-blood CINE fast-spin echo imaging for measuring abdominal aortic wall distensibility: a feasibility study

et al. 2017

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The paper reports a free-breathing black-blood CINE fast-spin echo (FSE) technique for measuring abdominal aortic wall motion. The free-breathing CINE FSE includes the following MR techniques: (1) variable-density sampling with fast iterative reconstruction; (2) inner-volume imaging; and (3) a blood-suppression preparation pulse. The proposed technique was evaluated in eight healthy subjects. The inner-volume imaging significantly reduced the intraluminal artifacts of respiratory motion (p = 0.015). The quantitative measurements were a diameter of 16.3 ± 2.8 mm and wall distensibility of 2.0 ± 0.4 mm (12.5 ± 3.4%) and 0.7 ± 0.3 mm (4.1 ± 1.0%) for the anterior and posterior walls, respectively. The cyclic cross-sectional distensibility was 35 ± 15% greater in the systolic phase than in the diastolic phase. In conclusion, we developed a feasible CINE FSE method to measure the motion of the abdominal aortic wall, which will enable clinical scientists to study the elasticity of the abdominal aorta.

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Fast spin echo imaging of carotid artery dynamics

Abstract: This cine FSE method produced repeatable dynamic carotid artery measurements with less artifact and greater temporal efficiency compared with prospectively gated FSE.

Cited by 9 publications

References 22 publications

T₂ shuffling: Sharp, multicontrast, volumetric fast spin‐echo imaging

T₂ shuffling: Sharp, multicontrast, volumetric fast spin‐echo imaging

Temporal resolution improvement of calibration‐free dynamic contrast‐enhanced MRI with compressed sensing optimized turbo spin echo: The effects of replacing turbo factor with compressed sensing accelerations

Free-breathing black-blood CINE fast-spin echo imaging for measuring abdominal aortic wall distensibility: a feasibility study

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Fast spin echo imaging of carotid artery dynamics

Abstract: This cine FSE method produced repeatable dynamic carotid artery measurements with less artifact and greater temporal efficiency compared with prospectively gated FSE.

Cited by 9 publications

References 22 publications

T2 shuffling: Sharp, multicontrast, volumetric fast spin‐echo imaging

T2 shuffling: Sharp, multicontrast, volumetric fast spin‐echo imaging

Temporal resolution improvement of calibration‐free dynamic contrast‐enhanced MRI with compressed sensing optimized turbo spin echo: The effects of replacing turbo factor with compressed sensing accelerations

Free-breathing black-blood CINE fast-spin echo imaging for measuring abdominal aortic wall distensibility: a feasibility study

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T₂ shuffling: Sharp, multicontrast, volumetric fast spin‐echo imaging

T₂ shuffling: Sharp, multicontrast, volumetric fast spin‐echo imaging