High temporal resolution motion estimation using a self‐navigated simultaneous multi‐slice echo planar imaging acquisition

Teruel, Jose R.; Kuperman, Joshua; Dale, Anders M.; White, Nathan S.

doi:10.1002/jmri.25953

Cited by 9 publications

(6 citation statements)

References 23 publications

(34 reference statements)

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“…Simultaneous multi-slice (SMS) imaging is a newly developed acceleration technique using multi-band RF pulses, which can simultaneously excite, acquire, and reconstruct multiple slices and readout with two-dimensional images (Larkman et al, 2001;Kenkel et al, 2016;Norbeck et al, 2018;Teruel et al, 2018). With this technique, the imaging time can be largely reduced.…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Simultaneous Multi-Slice Accelerated Turbo Spin-Echo Musculoskeletal Imaging: A Head-to-Head Comparison With Routine Turbo Spin-Echo Imaging

et al. 2021

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Background/Aim: The turbo spin-echo (TSE) sequence is widely used for musculoskeletal (MSK) imaging; however, its acquisition speed is limited and can be easily affected by motion artifacts. We aimed to evaluate whether the use of a simultaneous multi-slice TSE (SMS-TSE) sequence can accelerate MSK imaging while maintaining image quality when compared with the routine TSE sequence.Methods: We prospectively enrolled 71 patients [mean age, 37.43 ± 12.56 (range, 20–67) years], including 37 men and 34 women, to undergo TSE and SMS sequences. The total scanning times for the wrist, ankle and knee joint with routine sequence were 14.92, 13.97, and 13.48 min, respectively. For the SMS-TSE sequence, they were 7.52, 7.20, and 6.87 min. Quantitative parameters, including the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR), were measured. Three experienced MSK imaging radiologists qualitatively evaluated the image quality of bone texture, cartilage, tendons, ligament, meniscus, and artifact using a 5-point evaluation system, and the diagnostic performance of the SMS-TSE sequences was evaluated.Results: Compared with the routine TSE sequences, the scanning time was lower by 49.60, 48.46, and 49.04% using SMS-TSE sequences for the wrist, ankle, and knee joints, respectively. For the SNR comparison, the SMS-TSE sequences were significantly higher than the routine TSE sequence for wrist (except for Axial-T2WI-FS), ankle, and knee joint MR imaging (all p < 0.05), but no statistical significance was obtained for the CNR measurement (all p > 0.05, except for Sag-PDWI-FS in ankle joint). For the wrist joint, the diagnostic sensitivity, specificity, and accuracy were 88.24, 100, and 92%. For the ankle joint, they were 100, 75, and 93.33%. For the knee joint, they were 87.50, 85.71, and 87.10%.Conclusion: The use of the SMS-TSE sequence in the wrist, ankle, and knee joints can significantly reduce the scanning time and show similar image quality when compared with the routine TSE sequence.

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Section: Introductionmentioning

confidence: 99%

High-Resolution Simultaneous Multi-Slice Accelerated Turbo Spin-Echo Musculoskeletal Imaging: A Head-to-Head Comparison With Routine Turbo Spin-Echo Imaging

et al. 2021

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“…Simultaneous multisection imaging allows simultaneous excitation and acquisition of multiple sections, improving the signal-to-noise ratio and reducing acquisition time. By applying a section-specific phase gradient in k-space, the superimposed sections can be shifted with respect to one another to further improve the separation process (22).…”

Section: Current Clinicalmentioning

confidence: 99%

Abbreviated MRI Protocols for the Abdomen

et al. 2019

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Technical advances in MRI have improved image quality and have led to expanding clinical indications for its use. However, long examination and interpretation times, as well as higher costs, still represent barriers to use of MRI. Abbreviated MRI protocols have emerged as an alternative to standard MRI protocols. These abbreviated MRI protocols seek to reduce longer MRI protocols by eliminating unnecessary or redundant sequences that negatively affect cost, MRI table time, patient comfort, image quality, and image interpretation time. However, the diagnostic information is generally not compromised. Abbreviated MRI protocols have already been used successfully for hepatocellular carcinoma screening, for prostate cancer detection, and for screening for nonalcoholic fatty liver disease as well as monitoring patients with this disease. It has been reported that image acquisition time and costs can be considerably reduced with abbreviated MRI protocols, compared with standard MRI protocols, while maintaining a similar sensitivity and accuracy. Nevertheless, multiple applications still need to be explored in the abdomen and pelvis (eg, surveillance of metastases to the liver; follow-up of cystic pancreatic lesions, adrenal incidentalomas, and small renal masses; evaluation of ovarian cysts in postmenopausal women; staging of cervical and uterine corpus neoplasms; evaluation of müllerian duct anomalies). This article describes some successful applications of abbreviated MRI protocols, demonstrates how they can help in improving the MRI workflow, and explores potential future directions. ©

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“…By separately estimating and then combining the motion time‐courses of stacks of simultaneously acquired slices, we can increase the sampling rate of motion parameter estimation to high temporal resolution (HighRes) (high effective sampling rate) and gain more insight into additional ways the subject and the subject’s brain move. Similar techniques of slice‐wise motion correction have been proposed before, 8 and applied for real‐time motion correction 9,10 using slice‐to‐volume registration, in which guided breath‐hold at 0.34 Hz could be observed in one subject 10 . Here we introduce a simple slice‐wise motion estimation method to extract high quality estimates of normal respiratory and cardiac “motion” waveforms from simultaneous multislice (SMS) fMRI data, providing important physiological information, otherwise unavailable for long repetition time (TR) data.…”

Section: Introductionmentioning

confidence: 98%

Post‐hoc physiological waveform extraction from motion estimation in simultaneous multislice (SMS) functional MRI using separate stack processing

Hocke

Frederick

2020

Magnetic Resonance in Med

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Motion estimation is an essential step in functional MRI (fMRI) preprocessing. Usually, fMRI processing software packages (eg, FSL and AFNI) automatically estimate motion parameters in order to counteract the effects of motion. However, the time courses of the motion estimation for fMRI data also contain information about physiological processes. Here, we show that respiration and cardiac signals can be extracted from motion estimation at significantly higher bandwidth than is possible with current methods. Method: To detect motion at high effective temporal resolution (HighRes), the motion parameters of stacks of simultaneously acquired slices were estimated separately, then combined. This method was validated by extracting physiological motion signals from resting state fMRI (rsfMRI) data (Enhanced Nathan Kline Institute-Rockland Sample) and comparing them to respiration belt and pulse oximeter signals. Results: HighRes motion time-courses with an effective sampling rate of 15.5 and 11.4 Hz were extracted from repetition time (TR) = 0.645 and 1.4 s data, respectively. Respiration waveforms were extracted with significantly higher accuracy than the original motion parameters. Even cardiac waveforms could be extracted, despite the fact that the sampling time or TR values were too long to sample cardiac frequencies. Conclusion: HighRes motion traces provide insight into the subjects' motion at higher frequencies than can be estimated using standard techniques. In its simplest form, this technique can recover accurate respiration signals and may reveal additional complexity in brain motion.

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High temporal resolution motion estimation using a self‐navigated simultaneous multi‐slice echo planar imaging acquisition

Abstract: 2 Technical Efficacy: Stage 1 J. Magn. Reson. Imaging 2018.

Cited by 9 publications

References 23 publications

High-Resolution Simultaneous Multi-Slice Accelerated Turbo Spin-Echo Musculoskeletal Imaging: A Head-to-Head Comparison With Routine Turbo Spin-Echo Imaging

High-Resolution Simultaneous Multi-Slice Accelerated Turbo Spin-Echo Musculoskeletal Imaging: A Head-to-Head Comparison With Routine Turbo Spin-Echo Imaging

Abbreviated MRI Protocols for the Abdomen

Post‐hoc physiological waveform extraction from motion estimation in simultaneous multislice (SMS) functional MRI using separate stack processing

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