[Diagnostic value of a 3D-SPACE-sequence with compressed sensing technology for the knee joint]

Area of Science:

• Orthopedic imaging
• Radiology
• Medical physics

Background:

• Three-dimensional fast spin echo acquisition (SPACE) MRI sequences are time-consuming and prone to geometric blurring for knee joint assessment.
• Recent advancements have made these sequences more feasible for routine diagnostic imaging.

Purpose of the Study:

• To compare the diagnostic performance of compressed sensing SPACE (CS-SPACE) MRI with conventional 2D MRI sequences for acute knee injuries.
• To determine if CS-SPACE is non-inferior to established 2D sequences, offering shorter examination times.

Main Methods:

• 109 patients with knee injuries underwent MRI using both conventional and CS-SPACE sequences.
• Two blinded readers assessed inter- and intraobserver concordance.
• Fisher's exact test was used for statistical comparison between CS-SPACE and standard proton density fat-suppressed imaging.

Main Results:

• Excellent interobserver concordance was observed for ACL, PCL, and CL injuries with both 2D and 3D sequences.
• CS-SPACE showed high concordance for meniscal and ligamentous injuries, comparable to conventional sequences.
• Concordance for chondral injuries varied, with excellent results for higher grades using both methods.

Conclusions:

• CS-SPACE MRI demonstrates excellent interobserver concordance for ACL, PCL, and CL injuries, similar to conventional 2D sequences.
• CS-SPACE is a valuable tool for diagnosing acute knee injuries, offering comparable accuracy with potentially shorter scan times.