<i>k‐t</i>‐space accelerated myocardial perfusion

Jung, Bernd; Honal, Matthias; Hennig, Jürgen; Markl, Michael

doi:10.1002/jmri.21543

Cited by 12 publications

(8 citation statements)

References 16 publications

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“…For perfusion imaging, training data must be interleaved with undersampled imaging data to reflect similar contrast enhancement and avoid misregistration due to respiratory motion. Previously described perfusion studies using k‐t techniques have reported acceleration factors greater than 6 (8–10). However, respiratory motion represents a source of reconstruction error for these techniques, since signal overlap increases in the y‐f domain due to the presence of higher temporal frequencies and results in residual aliasing artifacts.…”

mentioning

confidence: 99%

Combination of compressed sensing and parallel imaging for highly accelerated first‐pass cardiac perfusion MRI

Otazo

Kim

Axel

et al. 2010

Magnetic Resonance in Med

521

562

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First-pass cardiac perfusion MRI is a natural candidate for compressed sensing acceleration since its representation in the combined temporal Fourier and spatial domain is sparse and the required incoherence can be effectively accomplished by k-t random undersampling. However, the required number of samples in practice (three to five times the number of sparse coefficients) limits the acceleration for compressed sensing alone. Parallel imaging may also be used to accelerate cardiac perfusion MRI, with acceleration factors ultimately limited by noise amplification. In this work, compressed sensing and parallel imaging are combined by merging the k-t SPARSE technique with sensitivity encoding (SENSE) reconstruction to substantially increase the acceleration rate for perfusion imaging. We also present a new theoretical framework for understanding the combination of k-t SPARSE with SENSE based on distributed compressed sensing theory. This framework, which identifies parallel imaging as a distributed multisensor implementation of compressed sensing, enables an estimate of feasible acceleration for the combined approach. We demonstrate feasibility of 8-fold acceleration in vivo with whole-heart coverage and high spatial and temporal resolution using standard coil arrays. The method is relatively insensitive to respiratory motion artifacts and presents similar temporal fidelity and image quality when compared to Generalized autocalibrating partially parallel acquisitions (GRAPPA) with 2-fold acceleration. Magn Reson Med 64:767-776,

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mentioning

confidence: 99%

Combination of compressed sensing and parallel imaging for highly accelerated first‐pass cardiac perfusion MRI

Otazo

Kim

Axel

et al. 2010

Magnetic Resonance in Med

521

562

View full text Add to dashboard Cite

show abstract

“…Image quality and signal‐intensity‐time‐courses in the blood pools and the myocardium were comparable to those attained with single‐slice excitation techniques, allowing for whole heart myocardial blood‐flow quantification on a pixel by pixel basis. In contrast to conventional parallel imaging approaches performing in plane acceleration (9, 26, 28), the presented approach provides significantly higher signal‐ and contrast‐to‐noise ratios. Furthermore, utilizing the proposed technique is more time efficient in comparison to performing a sequential acquisition of the two slices.…”

Section: Discussionmentioning

confidence: 99%

CAIPIRINHA accelerated SSFP imaging

Stäb

Ritter

Breuer

et al. 2010

Magnetic Resonance in Med

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Exciting multiple slices at the same time, ''controlled aliasing in parallel imaging results in higher acceleration'' (CAIPIRI-NHA) and ''phase-offset multiplanar'' have shown to be very effective techniques in 2D multislice imaging. Being provided with individual rf phase cycles, the simultaneously excited slices are shifted with respect to each other in the FOV and, thus, can be easily separated. For SSFP sequences, however, similar rf phase cycles are required to maintain the steady state, impeding a straightforward application of phase-offset multiplanar or controlled aliasing in parallel imaging results in higher acceleration. In this work, a new flexible concept for applying the two multislice imaging techniques to SSFP sequences is presented. Linear rf phase cycles are introduced providing both in one, the required shift between the slices and steady state in each slice throughout the whole measurement. Consequently, the concept is also appropriate for realtime and magnetization prepared imaging. Steady state properties and shifted banding behavior of the new phase cycles were investigated using simulations and phantom experiments. Moreover, the concept was applied to perform whole heart myocardial perfusion SSFP imaging as well as real-time and cine SSFP imaging with increased coverage. Showing no significant penalties in SNR or image quality, the results successfully demonstrate the general applicability of the concept. Magn Reson Med 65:157-164,

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“…k-t SENSE methods using Cartesian undersampling have been reported to give good results for 3-4 slices with a net acceleration factor of 3-4 by acquiring 23-33 phase encoding lines. 9,10 Compressed sensing combined with parallel imaging was reported to achieve an acceleration factor of 8 by acquiring 16-24 lines. 11 Radial undersampling patterns have been explored due to their robustness to motion and undersampling.…”

Section: Introductionmentioning

confidence: 99%

Myocardial perfusion MRI with an undersampled 3D stack‐of‐stars sequence

et al. 2012

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Purpose:To determine the feasibility of three-dimensional (3D) hybrid radial (stack-of-stars) MRI with spatiotemporal total variation (TV) constrained reconstruction for dynamic contrast enhanced myocardial perfusion imaging. Methods: An ECG-triggered saturation recovery turboFLASH sequence with undersampled stackof-stars sampling with spatiotemporal TV constrained reconstruction was developed for dynamic contrast enhanced myocardial perfusion imaging. Simulations were performed to study the dependence of the approach to steady state on flip angle and saturation recovery time for this stack-of-stars acquisition. Phantom studies were used to show the effect of the flip angle selection and imperfect spoiling on image qualities. Studies were done in three humans to test the feasibility of the approach for myocardial perfusion imaging. Results: The simulation and phantom studies showed that imperfect spoiling and magnetization changes during the readout were a function of flip angle and nonoptimized selection of flip angle could degrade the images. Low flip angle acquisitions in the human subjects result in images with good quality similar to multislice radial 2D images. Conclusions: 3D stack-of-stars sampling with spatiotemporal TV constrained reconstruction provides a promising alternative for myocardial perfusion imaging.

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k‐t‐space accelerated myocardial perfusion

Cited by 12 publications

References 16 publications

Combination of compressed sensing and parallel imaging for highly accelerated first‐pass cardiac perfusion MRI

Combination of compressed sensing and parallel imaging for highly accelerated first‐pass cardiac perfusion MRI

CAIPIRINHA accelerated SSFP imaging

Myocardial perfusion MRI with an undersampled 3D stack‐of‐stars sequence

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