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Pediatric Radiology

, Volume 40, Issue 3, pp 284–293 | Cite as

The use of parallel imaging for MRI assessment of knees in children and adolescents

  • Andrea S. DoriaEmail author
  • Gulraiz A. Chaudry
  • Cristina Nasui
  • Tammy Rayner
  • Chenghua Wang
  • Rahim Moineddin
  • Paul S. Babyn
  • Larry M. White
  • Marshall S. Sussman
Original Article

Abstract

Background

Parallel imaging provides faster scanning at the cost of reduced signal-to-noise ratio (SNR) and increased artifacts.

Objective

To compare the diagnostic performance of two parallel MRI protocols (PPs) for assessment of pathologic knees using an 8-channel knee coil (reference standard, conventional protocol [CP]) and to characterize the SNR losses associated with parallel imaging.

Materials and methods

Two radiologists blindly interpreted 1.5 Tesla knee MRI images in 21 children (mean 13 years, range 9–18 years) with clinical indications for an MRI scan. Sagittal proton density, T2-W fat-saturated FSE, axial T2-W fat-saturated FSE, and coronal T1-W (NEX of 1,1,1) images were obtained with both CP and PP. Images were read for soft tissue and osteochondral findings.

Results

There was a 75% decrease in acquisition time using PP in comparison to CP. The CP and PP protocols fell within excellent or upper limits of substantial agreement: CP, kappa coefficient, 0.81 (95% CIs, 0.73–0.89); PP, 0.80–0.81 (0.73–0.89). The sensitivity of the two PPs was similar for assessment of soft (0.98–1.00) and osteochondral (0.89–0.94) tissues. Phantom data indicated an SNR of 1.67, 1.6, and 1.51 (axial, sagittal and coronal planes) between CP and PP scans.

Conclusion

Parallel MRI provides a reliable assessment for pediatric knees in a significantly reduced scan time without affecting the diagnostic performance of MRI.

Keywords

Knees Children Adolescents MRI 

Notes

Acknowledgement

This study was partially funded by a Canadian Child Health Clinician-Scientist Program Career Development Award to Dr. Andrea S. Doria.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Andrea S. Doria
    • 1
    Email author
  • Gulraiz A. Chaudry
    • 2
  • Cristina Nasui
    • 1
  • Tammy Rayner
    • 1
  • Chenghua Wang
    • 1
  • Rahim Moineddin
    • 3
  • Paul S. Babyn
    • 1
  • Larry M. White
    • 4
  • Marshall S. Sussman
    • 5
  1. 1.Department of Diagnostic ImagingTorontoCanada
  2. 2.Department of RadiologyChildren’s HospitalBostonUSA
  3. 3.Department of Public HealthUniversity of TorontoTorontoCanada
  4. 4.Department of Diagnostic ImagingMount Sinai HospitalTorontoCanada
  5. 5.Department of Diagnostic ImagingUniversity Health NetworkTorontoCanada

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