3D isotropic turbo spin-echo intermediate-weighted sequence with refocusing control in knee imaging: comparison study...

Area of Science:

• Radiology
• Medical Imaging
• Orthopedic Imaging

Background:

• Three-dimensional (3D) turbo spin-echo (TSE) MRI offers comparable diagnostic performance to 2D TSE for extremities.
• Previous studies have not compared 3D isotropic TSE intermediate-weighted (VISTA) and 3D fast-field echo (FFE) sequences for knee joint image quality.

Purpose of the Study:

• To compare the image quality of 3D VISTA and 3D FFE sequences for knee joint imaging.
• Evaluate tissue contrast differences between fluid-ligament, fluid-meniscus, and fluid-cartilage interfaces.

Main Methods:

• 10 healthy volunteers underwent 3.0 T knee MRI using VISTA and 3D FFE sequences.
• Musculoskeletal radiologists qualitatively assessed tissue contrast using a 4-point scale.
• Quantitative analysis included signal-to-noise ratio (SNR) and contrast ratios (CR) for specific tissue interfaces.

Main Results:

• VISTA demonstrated statistically superior qualitative tissue contrast for fluid-ligament (F-L) and fluid-meniscus (F-M) interfaces (P < 0.001).
• 3D FFE showed superior, though not statistically significant, qualitative contrast for fluid-cartilage (F-C).
• Quantitative analysis confirmed VISTA's higher SNR and superior CR for F-L and F-M, while 3D FFE excelled in F-C CR (P = 0.038).

Conclusions:

• The VISTA sequence offers superior subjective and quantitative tissue contrast for fluid-meniscus and fluid-ligament interfaces in knee MRI.
• The 3D FFE sequence provides superior contrast for the fluid-cartilage interface.