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Deep Learning-Driven Abbreviated Shoulder MRI Protocols: Diagnostic Accuracy in Clinical Practice.

Giovanni Foti1, Flavio Spoto1, Thomas Mignolli1

  • 1Department of Radiology, IRCCS Sacro Cuore Don Calabria Hospital, 37024 Negrar, Italy.

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Summary

Deep learning (DL) accelerated shoulder MRI protocols show high diagnostic accuracy. The 2-fold DL protocol (DL2) offers excellent performance, nearly matching standard MRI, while the 4-fold DL protocol (DL4) also maintains reliability, improving workflow efficiency.

Keywords:
accelerated protocolsdeep learningdiagnostic accuracymagnetic resonance imagingshoulder

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Area of Science:

  • Radiology
  • Medical Imaging
  • Artificial Intelligence in Medicine

Background:

  • Deep learning (DL) reconstruction shows potential for reducing MRI scan times without compromising image quality.
  • Clinical impact of accelerated DL shoulder MRI protocols on diagnostic accuracy is not well-established.

Purpose of the Study:

  • To assess the diagnostic accuracy of 2-fold (DL2) and 4-fold (DL4) DL-accelerated shoulder MRI protocols compared to standard MRI.
  • Evaluate the impact of acceleration factors on clinical diagnostic performance.

Main Methods:

  • Prospective study of 88 patients undergoing standard, DL2, and DL4 shoulder MRI.
  • Four radiologists assessed bone marrow edema, rotator cuff tears, and labral lesions.
  • Calculated sensitivity, specificity, interobserver agreement, and diagnostic confidence.

Main Results:

  • DL2 and DL4 achieved high diagnostic accuracy for bone marrow edema (100% sensitivity/specificity).
  • Rotator cuff tear detection showed high sensitivity and specificity for both DL2 (98-100%/99-100%) and DL4 (95-98%/99-100%).
  • Labral tear detection was perfect with DL2 and slightly reduced with DL4 (89-100% sensitivity); interobserver agreement was excellent (Kendall's W = 0.92-0.98).

Conclusions:

  • DL-accelerated shoulder MRI, particularly DL2, can significantly reduce acquisition time (by 50%) while maintaining diagnostic reliability.
  • DL2 protocols offer an optimal balance of speed and diagnostic confidence, enhancing patient throughput and MRI accessibility.
  • DL4 provides acceptable accuracy but may show reduced sensitivity for subtle findings, especially with less experienced readers.