Comparative study of imaging at 3.0 T versus 1.5 T of the knee |
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Authors: | Scott Wong Lynne Steinbach Jian Zhao Christoph Stehling C Benjamin Ma Thomas M Link |
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Institution: | (1) Department of Radiology, University of California, San Francisco, 400 Parnassus Ave., A 367, P.O. Box 0628, San Francisco, CA 94143-0628, USA;(2) University of Miami Miller School of Medicine, Miami, FL, USA;(3) Department of Radiology, University of Muenster, Muenster, Germany;(4) Department of Orthopedic Surgery, University of California San Francisco, San Francisco, CA, USA |
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Abstract: | Purpose The objectives of the study were to compare MR imaging at 1.5 and 3.0 T in the same patients concerning image quality and
visualization of cartilage pathology and to assess diagnostic performance using arthroscopy as a standard of reference.
Materials and methods Twenty-six patients were identified retrospectively as having comparative 1.5 and 3.0 T MR studies of the knee within an average
of 102 days. Standard protocols included T1-weighted and fat-saturated intermediate-weighted fast spin-echo sequences in three
planes; sequence parameters had been adjusted to account for differences in relaxation at 3.0 T. Arthroscopy was performed
in 19 patients. Four radiologists reviewed each study independently, scored image quality, and analyzed pathological findings.
Sensitivities, specificities, and accuracies in diagnosing cartilage lesions were calculated in the 19 patients with arthroscopy,
and differences between 1.5 and 3.0 T exams were compared using paired Student’s t tests with a significance threshold of p < 0.05.
Results Each radiologist scored the 3.0 T studies higher than those obtained at 1.5 T in visualizing anatomical structures and abnormalities
(p < 0.05). Using arthroscopy as a standard of reference, diagnosis of cartilage abnormalities was improved at 3.0 T with higher
sensitivity (75.7% versus 70.6%), accuracy (88.2% versus 86.4%), and correct grading of cartilage lesions (51.3% versus 42.9%).
Diagnostic confidence scores were higher at 3.0 than 1.5 T (p < 0.05) and signal-to-noise ratio at 3.0 T was approximately twofold higher than at 1.5 T.
Conclusion MRI at 3.0 T improved visualization of anatomical structures and improved diagnostic confidence compared to 1.5 T. This resulted
in significantly better sensitivity and grading of cartilage lesions at the knee. |
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Keywords: | MRI Knee-studies Comparative MRI Sequences-3 0 T imaging High field imaging |
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