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FSE-Cube earns praise forquality 3T knee MR imaging

Diagnostic ImagingDiagnostic Imaging Vol 31 No 4
Volume 31
Issue 4

A new 3D fast spin-echo MR sequenceat 3T could one day help musculoskeletalradiologists perform comprehensiveevaluations of articular cartilageof the knee in only five minutes.

A new 3D fast spin-echo MR sequence at 3T could one day help musculoskeletal radiologists perform comprehensive evaluations of articular cartilage of the knee in only five minutes.

Standard imaging protocols used in clinical practice for assessment of knee cartilage volumes and derangement include a combination of 2D FSE and high-resolution 3D spoiled gradientecho (SPGR) sequences. Both, however, are stymied by image resolution limitations and long imaging times.

A single isotropic FSE sequence would be ideal for clinical longitudinal studies of osteoarthritis, said principal investigator Dr. Richard Kijowski, an MSK radiologist at the University of Wisconsin-Madison.

Kijowski and collaborators at UWMadison and Stanford University compared the new 3D fast spin-echo (FSECube) sequence with a routine MRI protocol for evaluation of cartilage, ligaments, menisci, and osseous structures of the knee joint. The investigators enrolled 100 consecutive patients who underwent all MR scanning protocols at 3T using arthrography as the gold standard.

The researchers found that FSE-Cube provided volume measurements of the femoral, tibial, and patellar cartilage that led to detection of collateral ligament injuries and bone marrow edema lesions. FSE-Cube findings were just as diagnostically useful as those provided by the routine knee MRI protocol. The differences were not statistically significant. Kijowski released the group’s findings at the 2008 RSNA meeting.

“FSE-Cube is an intermediate-weighted sequence with maximized signal-to-noise ratio efficiency, minimal blurring, and good fat suppression,” Kijowski said. “It has similar diagnostic performance as a routine knee MRI protocol for evaluating the cartilage, ligaments, menisci, and osseous structures of the knee joint at 3T.”

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