Abstract
Simultaneous multislice imaging (SMS) using parallel image reconstruction has rapidly advanced to become a major imaging technique. The primary benefit is an acceleration in data acquisition that is equal to the number of simultaneously excited slices. Unlike in‐plane parallel imaging this can have only a marginal intrinsic signal‐to‐noise ratio penalty, and the full acceleration is attainable at fixed echo time, as is required for many echo planar imaging applications. Furthermore, for some implementations SMS techniques can reduce radiofrequency (RF) power deposition. In this review the current state of the art of SMS imaging is presented. In the Introduction, a historical overview is given of the history of SMS excitation in MRI. The following section on RF pulses gives both the theoretical background and practical application. The section on encoding and reconstruction shows how the collapsed multislice images can be disentangled by means of the transmitter pulse phase, gradient pulses, and most importantly using multichannel receiver coils. The relationship between classic parallel imaging techniques and SMS reconstruction methods is explored. The subsequent section describes the practical implementation, including the acquisition of reference data, and slice cross‐talk. Published applications of SMS imaging are then reviewed, and the article concludes with an outlook and perspective of SMS imaging. Magn Reson Med 75:63–81, 2016. © 2015 The Authors. Magnetic Resonance in Medicine Published by Wiley Periodicals, Inc. on behalf of International Society of Medicine in Resonance.
Highlights
The possible advantages of simultaneously exciting and imaging several slices were realized early in the development of MRI [1]
This idea was only followed up by a relatively small community, and did not attract widespread attention for almost a decade. Contributing factors to this slow development were probably the relatively late availability of receiver coils with a coil distribution along the z-axis, which is necessary to accelerate axial acquisitions; and the lack of an obvious application. Despite this relative lack of initial interest, important progress was made during these years, and special attention should be given to the CAIPIRINHA technique [13], which in a similar manner to POMP uses the phase of the RF pulses to shift the position of adjacent slices in image space
For cardiac MRI, this is due to the necessity to acquire data during a single breathhold or even during a single heartbeat, so simultaneous multislice (SMS) imaging lends itself naturally due to the large SNR advantage and increased coverage compared with standard parallel MRI (pMRI) in cardiac perfusion MRI
Summary
The following full text is a publisher's version. For additional information about this publication click this link. http://hdl.handle.net/2066/156958. Please be advised that this information was generated on 2021-11-02 and may be subject to change. Simultaneous multislice imaging (SMS) using parallel image reconstruction has rapidly advanced to become a major imaging technique. The relationship between classic parallel imaging techniques and SMS reconstruction methods is explored. The subsequent section describes the practical implementation, including the acquisition of reference data, and slice cross-talk.
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