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Ristretto MRE: A generalized multi‐shot GRE‐MRE sequence

A generalized multi-shot GRE-MRE sequence
Authors: Ralph, Sinkus; Guenthner, Christian; Sethi, Sweta; Troelstra, Marian; Dokumaci, Ayse Sila; Sinkus, Ralph; Kozerke, Sebastian;

Ristretto MRE: A generalized multi‐shot GRE‐MRE sequence

Abstract

In order to acquire consistent k‐space data in MR elastography, a fixed temporal relationship between the MRI sequence and the underlying period of the wave needs to be ensured. To this end, conventional GRE‐MRE enforces synchronization through repeated triggering of the transducer and forcing the sequence repetition time to be equal to an integer multiple of the wave period. For wave frequencies below 100 Hz, however, this leads to prolonged acquisition times, as the repetition time scales inversely with frequency. A previously developed multi‐shot approach (eXpresso MRE) to multi‐slice GRE‐MRE tackles this issue by acquiring an integer number of slices per wave period, which allows acquisition to be accelerated in typical scenarios by a factor of two or three. In this work, it is demonstrated that the constraints imposed by the eXpresso scheme are overly restrictive. We propose a generalization of the sequence in three steps by incorporating sequence delays into imaging shots and allowing for interleaved wave‐phase acquisition. The Ristretto scheme is compared in terms of imaging shot and total scan duration relative to eXpresso and conventional GRE‐MRE and is validated in three different phantom studies. First, the agreement of measured displacement fields in different stages of the sequence generalization is shown. Second, performance is compared for 25, 36, 40, and 60 Hz actuation frequencies. Third, the performance is assessed for the acquisition of different numbers of slices (13 to 17). In vivo feasibility is demonstrated in the liver and the breast. Here, Ristretto is compared with an optimized eXpresso sequence, leading to scan accelerations of 15% and 5%, respectively, without compromising displacement field and stiffness estimates in general. The Ristretto concept allows us to choose imaging shot durations on a fine grid independent of the number of slices and the wave frequency, permitting 2‐ to 4.5‐fold acceleration of conventional GRE‐MRE acquisitions.

Countries
Netherlands, Switzerland, United Kingdom, France, France, Switzerland
Keywords

Time Factors, interleaved acquisition, [SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging, [SDV]Life Sciences [q-bio], 610, 1607 Spectroscopy, 610 Medicine & health, Signal-To-Noise Ratio, 170 Ethics, 2741 Radiology, Nuclear Medicine and Imaging, Humans, multi-slice, 10237 Institute of Biomedical Engineering, Spectroscopy, Research Articles, [SDV.IB] Life Sciences [q-bio]/Bioengineering, MR elastography, eXpresso; GRE-MRE; interleaved acquisition; MR elastography; multi-shot; multi-slice, multi-shot, Phantoms, Imaging, eXpresso, Magnetic Resonance Imaging, [SDV] Life Sciences [q-bio], [SDV.IB.IMA] Life Sciences [q-bio]/Bioengineering/Imaging, Radiology Nuclear Medicine and imaging, 1313 Molecular Medicine, Molecular Medicine, Elasticity Imaging Techniques, [SDV.IB]Life Sciences [q-bio]/Bioengineering, Female, GRE-MRE

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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    25
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
25
Top 10%
Top 10%
Top 10%
Green
hybrid