Highly accelerated subtractive femoral non‐contrast‐enhanced MRA using compressed sensing with k‐space subtraction, phase and intensity correction

Li, Hao; Graves, Martin J.; Shaida, Nadeem; Prashar, Akash; Lomas, David J.; Priest, Andrew N.

doi:10.1002/mrm.28736

Cited by 3 publications

(2 citation statements)

References 41 publications

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“…For the sole purpose of MRA, the former approach is also effective. In addition to the magnitude subtraction in the image domain, complex subtraction in k‐space has been demonstrated with higher acceleration for MRA, 60 which could improve the low time efficiency for subtractive approaches while still achieving full cancelation of the tissue background. The benefit of k‐space subtraction for FT‐VSI‐prepared VSMRA is worth further investigation.…”

Section: Discussionmentioning

confidence: 99%

Direct angiographic comparison of different velocity‐selective saturation, inversion, and DANTE labeling modules on cerebral arteries

Liu,

Zhu,

Qin

2024

Magnetic Resonance in Med

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PurposeThis study evaluated the velocity‐selective (VS) MRA with different VS labeling modules, including double refocused hyperbolic tangent, eight‐segment B1‐insensitive rotation, delay alternating with nutation for tailored excitation, Fourier transform–based VS saturation, and Fourier transform–based inversion.MethodsThese five VS labeling modules were evaluated first through Bloch simulations, and then using VSMRA directly on various cerebral arteries of healthy subjects. The relative signal ratios from arterial ROIs and surrounding tissues as well as relative arteria‐tissue contrast ratios of different methods were compared.ResultsDouble refocused hyperbolic tangent and eight‐segment B1‐insensitive rotation showed very similar labeling effects. Delay alternating with nutation for tailored excitation yielded high arterial signal but with residual tissue signal due to the spatial banding effect. Fourier transform–based VS saturation with half the time of other techniques serves as an efficient nonsubtractive VSMRA method, but the remaining tissue signal still obscured some small distal arteries that were delineated by other subtraction‐based VSMRA, allowing more complete cancelation of static tissue. Fourier transform–based inversion produced the highest arterial signal in VSMRA with minimal tissue background.ConclusionThis is the first study that angiographically compared five different VS labeling modules. Their labeling characteristics on arteries and tissue and implications for VSMRA and VS arterial spin labeling are discussed.

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Section: Discussionmentioning

confidence: 99%

Direct angiographic comparison of different velocity‐selective saturation, inversion, and DANTE labeling modules on cerebral arteries

Liu,

Zhu,

Qin

2024

Magnetic Resonance in Med

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“…Another potential advantage of reducing the static background signal in angiograms is that it improves image sparsity, which we have recently shown can facilitate compressed sensing reconstruction and potentially improve reconstruction accuracy. 34 Although the regression results and background suppression effect of robust regression methods were analyzed in volunteer and patient images, the diagnostic performance was not evaluated in this study. Future work will assess if clinical diagnosis or diagnostic confidence can be improved by background suppression using robust regression.…”

Section: Discussionmentioning

confidence: 99%

Subtractive NCE‐MRA: Improved background suppression using robust regression‐based weighted subtraction

Wang

Graves

et al. 2020

Magnetic Resonance in Med

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Purpose To correct the intensity difference of static background signal between bright blood images and dark blood images in subtractive non‐contrast–enhanced MR angiography using robust regression, thereby improving static background signal suppression on subtracted angiograms. Methods Robust regression (RR), using iteratively reweighted least squares, is used to calculate the regression coefficient of background tissues from a scatter plot showing the voxel intensity of bright blood images versus dark blood images. The weighting function is based on either the Euclidean distance from the estimated regression line or the deviation angle. Results from RR using the deviation angle (RRDA), conventional RR using the Euclidean distance, and ordinary leastsquares regression were compared with reference values determined manually by two observers. Performance was evaluated over studies using different sequences, including 36 thoracic flow‐sensitive dephasing data sets, 13 iliac flow‐sensitive dephasing data sets, and 26 femoral fresh blood imaging data sets. Results RR deviation angle achieved robust and accurate performance in all types of images, with small bias, small mean absolute error, and high‐correlation coefficients with reference values. Background tissues, such as muscle, veins, and bladder, were suppressed while the vascular signal was preserved. Euclidean distance gave good performance for thoracic and iliac flow‐sensitive dephasing, but could not suppress background tissues in femoral fresh blood imaging. Ordinary least squares regression was sensitive to outliers and overestimated regression coefficients in thoracic flow‐sensitive dephasing. Conclusion Weighted subtraction using RR was able to acquire the regression coefficients of background signal and improve background suppression of subtractive non‐contrast–enhanced MR angiography techniques. RR deviation angle has the most robust and accurate overall performance among three regression methods.

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Use of Compressed Sensing Accelerated, Low-Velocity Encoded, Isotropic Resolution, Phase Contrast Magnetic Resonance Angiography for SEEG Electrode Implantation

Liu¹,

Lin²,

Shen³

et al. 2024

World Neurosurgery

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Highly accelerated subtractive femoral non‐contrast‐enhanced MRA using compressed sensing with k‐space subtraction, phase and intensity correction

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 3 publications

References 41 publications

Direct angiographic comparison of different velocity‐selective saturation, inversion, and DANTE labeling modules on cerebral arteries

Direct angiographic comparison of different velocity‐selective saturation, inversion, and DANTE labeling modules on cerebral arteries

Subtractive NCE‐MRA: Improved background suppression using robust regression‐based weighted subtraction

Use of Compressed Sensing Accelerated, Low-Velocity Encoded, Isotropic Resolution, Phase Contrast Magnetic Resonance Angiography for SEEG Electrode Implantation

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