Comprehensive quantification of signal‐to‐noise ratio and <i>g</i>‐factor for image‐based and <i>k</i>‐space‐based parallel imaging reconstructions

Robson, Philip M.; Grant, Aaron K.; Madhuranthakam, Ananth J.; Lattanzi, Riccardo; Sodickson, Daniel K.; McKenzie, Charles A.

doi:10.1002/mrm.21728

Cited by 366 publications

(416 citation statements)

References 24 publications

(82 reference statements)

Supporting

Mentioning

404

Contrasting

Order By: Relevance

“…15 On the other hand, in a scan accelerated by parallel imaging, such as 3D CAIPIRINHA, loss of SNR is a well-known limitation of undersampling. 19,20 On the other hand, the lack of fidelity of the time-intensity curve obtained from KWIC-Radial-VIBE is a known drawback in the quantification of perfusion analysis. 3 In our study, six individual subframe images were generated every 5 s with 54 radial views for the central k-space filling.…”

Section: Discussionmentioning

confidence: 99%

Feasibility of free-breathing dynamic contrast-enhanced MRI of the abdomen: a comparison between CAIPIRINHA-VIBE, Radial-VIBE with KWIC reconstruction and conventional VIBE

Seo¹,

Park²,

Kim³

et al. 2016

BJR

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Feasibility of free-breathing dynamic contrast-enhanced MRI of the abdomen: a comparison between CAIPIRINHA-VIBE, Radial-VIBE with KWIC reconstruction and conventional VIBE

Seo¹,

Park²,

Kim³

et al. 2016

BJR

View full text Add to dashboard Cite

“…SNR was computed using the pseudo‐replica method in the spectral domain 42. Linewidth was defined as the full‐width‐at‐half‐maximum of the fitted NAA resonance.…”

Section: Methodsmentioning

confidence: 99%

Density‐weighted concentric circle trajectories for high resolution brain magnetic resonance spectroscopic imaging at 7T

Hingerl

Bogner

Moser

et al. 2017

Magnetic Resonance in Med

View full text Add to dashboard Cite

PurposeFull‐slice magnetic resonance spectroscopic imaging at ≥7 T is especially vulnerable to lipid contaminations arising from regions close to the skull. This contamination can be mitigated by improving the point spread function via higher spatial resolution sampling and k‐space filtering, but this prolongs scan times and reduces the signal‐to‐noise ratio (SNR) efficiency. Currently applied parallel imaging methods accelerate magnetic resonance spectroscopic imaging scans at 7T, but increase lipid artifacts and lower SNR‐efficiency further. In this study, we propose an SNR‐efficient spatial‐spectral sampling scheme using concentric circle echo planar trajectories (CONCEPT), which was adapted to intrinsically acquire a Hamming‐weighted k‐space, thus termed density‐weighted‐CONCEPT. This minimizes voxel bleeding, while preserving an optimal SNR.Theory and MethodsTrajectories were theoretically derived and verified in phantoms as well as in the human brain via measurements of five volunteers (single‐slice, field‐of‐view 220 × 220 mm2, matrix 64 × 64, scan time 6 min) with free induction decay magnetic resonance spectroscopic imaging. Density‐weighted‐CONCEPT was compared to (a) the originally proposed CONCEPT with equidistant circles (here termed e‐CONCEPT), (b) elliptical phase‐encoding, and (c) 5‐fold Controlled Aliasing In Parallel Imaging Results IN Higher Acceleration accelerated elliptical phase‐encoding.ResultsBy intrinsically sampling a Hamming‐weighted k‐space, density‐weighted‐CONCEPT removed Gibbs‐ringing artifacts and had in vivo +9.5%, +24.4%, and +39.7% higher SNR than e‐CONCEPT, elliptical phase‐encoding, and the Controlled Aliasing In Parallel Imaging Results IN Higher Acceleration accelerated elliptical phase‐encoding (all P < 0.05), respectively, which lead to improved metabolic maps.ConclusionDensity‐weighted‐CONCEPT provides clinically attractive full‐slice high‐resolution magnetic resonance spectroscopic imaging with optimal SNR at 7T. Magn Reson Med 79:2874–2885, 2018. © 2017 The Authors Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance in Medicine. 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.

show abstract

“…To evaluate the performance, the g-factor map (19,20), the difference image as well as the difference ADC map between the results from fully sampled and accelerated data, were determined for both standard and mutual calibration. To enable the g-factor calculation, a separate data set containing pure noise was also acquired during the same scan, as proposed in (19).…”

Section: Methodsmentioning

confidence: 99%

“…To enable the g-factor calculation, a separate data set containing pure noise was also acquired during the same scan, as proposed in (19). The noise data provided information to simulate pseudo multiple replica of synthetic random noise with correct scaling and correlation.…”

Section: Methodsmentioning

confidence: 99%

A parallel imaging technique using mutual calibration for split‐blade diffusion‐weighted PROPELLER

Li¹,

Pipe

Aboussouan

et al. 2010

Magnetic Resonance in Med

View full text Add to dashboard Cite

Split-blade diffusion-weighted periodically rotated overlapping parallel lines with enhanced reconstruction (DW-PROPELLER) was proposed to address the issues associated with diffusion-weighted echo planar imaging such as geometric distortion and difficulty in high-resolution imaging. The major drawbacks with DW-PROPELLER are its high SAR (especially at 3T) and violation of the Carr-Purcell-Meiboom-Gill condition, which leads to a long scan time and narrow blade. Parallel imaging can reduce scan time and increase blade width; however, it is very challenging to apply standard k-spacebased techniques such as GeneRalized Autocalibrating Partially Parallel Acquisitions (GRAPPA) to split-blade DW-PRO-PELLER due to its narrow blade. In this work, a new calibration scheme is proposed for k-space-based parallel imaging method without the need of additional calibration data, which results in a wider, more stable blade. The in vivo results show that this technique is very promising. Magn Reson Med 65:638-644,

show abstract

Comprehensive quantification of signal‐to‐noise ratio and g‐factor for image‐based and k‐space‐based parallel imaging reconstructions

Cited by 366 publications

References 24 publications

Feasibility of free-breathing dynamic contrast-enhanced MRI of the abdomen: a comparison between CAIPIRINHA-VIBE, Radial-VIBE with KWIC reconstruction and conventional VIBE

Feasibility of free-breathing dynamic contrast-enhanced MRI of the abdomen: a comparison between CAIPIRINHA-VIBE, Radial-VIBE with KWIC reconstruction and conventional VIBE

Density‐weighted concentric circle trajectories for high resolution brain magnetic resonance spectroscopic imaging at 7T

A parallel imaging technique using mutual calibration for split‐blade diffusion‐weighted PROPELLER

Contact Info

Product

Resources

About