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Simultaneous multi-slice accelerated turbo spin echo of the knee in pediatric patients

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Abstract

Purpose

To compare knee MRI performed with the integrated parallel acquisition technique (PAT) and simultaneous multislice (SMS) turbo spin echo (TSE) T2-weighted (T2w) sequences with conventional TSE sequences in pediatric patients.

Materials and methods

This was a retrospective IRB-approved study. Seventy-four subjects (26 male, 48 female, mean age 15.3 years, range 8–20) underwent 3-T MRI of the knee with a T2w TSE pulse sequence prototype with four-fold PAT and SMS acceleration as well as the standard PAT-only accelerated sequences. Images were anonymized and two study folders were created: one examination with only T2w PAT2 images (conventional examination) and one examination with only T2w SMS2/PAT2 sequences (SMS examination). Two readers rated examinations for 15 specific imaging findings and 5 quality metrics. Interreader agreement was measured. Signal to noise (SNR) and contrast to noise (CNR) were measured for SMS and conventional T2w sequences.

Results

Consensus review demonstrated diagnostic quality performance of SMS examinations with respect to all 15 structures. Average area under the curve (AROC) was 0.95 and 0.97 for readers 1 and 2, respectively. The conventional sequence was favored over SMS for four out of five quality metrics (p < 0.001). SNR and CNR were higher for the conventional sequences compared to SMS.

Conclusion

SMS accelerated T2w TSE sequences offer a faster alternative for knee imaging in pediatric patients without compromise in diagnostic performance despite diminished SNR. The four-fold acceleration of SMS is beneficial to pediatric patients who often have difficulty staying still for long MRI examinations.

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Authors and Affiliations

  1. Department of Radiology, Boston Children’s Hospital, 300 Longwood Avenue, Boston, MA, 02115, USA

    Sebastien Benali, Patrick R. Johnston, Ali Gholipour, Monet E. Dugan & Sarah D. Bixby

  2. Siemens Medical Solutions, Charlestown, MA, USA

    Keith Heberlein & Himanshu Bhat

Authors
  1. Sebastien Benali
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  2. Patrick R. Johnston
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  3. Ali Gholipour
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  4. Monet E. Dugan
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  5. Keith Heberlein
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  6. Himanshu Bhat
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  7. Sarah D. Bixby
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Correspondence to Sarah D. Bixby.

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Benali, S., Johnston, P.R., Gholipour, A. et al. Simultaneous multi-slice accelerated turbo spin echo of the knee in pediatric patients. Skeletal Radiol 47, 821–831 (2018). https://doi.org/10.1007/s00256-017-2868-2

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  • DOI: https://doi.org/10.1007/s00256-017-2868-2

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