Fast comprehensive single-sequence four-dimensional pediatric knee MRI with T₂ shuffling.

Area of Science:

• Radiology
• Medical Imaging
• Pediatric Orthopedics

Background:

• Conventional pediatric knee MRI protocols often involve multiple sequences, increasing imaging time and potential for patient discomfort.
• Developing efficient and accurate imaging techniques is crucial for diagnosing pediatric knee conditions.

Purpose of the Study:

• To develop and evaluate a novel pediatric knee MRI technique using T2 Shuffling (T2 Sh).
• To compare the diagnostic performance, image quality, and imaging time of T2 Sh against conventional 2D MRI protocols.

Main Methods:

• A modified volumetric fast spin-echo (3DFSE) sequence, T2 Shuffling (T2 Sh), was implemented for 3T knee MRI in 28 children.
• Two blinded readers assessed T2 Sh performance, with discrepancies resolved by consensus. Image quality and imaging time were compared to standard 2D protocols.

Main Results:

• T2 Sh demonstrated high concordance with diagnostic reports (81-87%) and achieved 93% sensitivity and 100% specificity for clinically relevant findings.
• Image quality was comparable to 2D MRI, with no significant difference in structure delineation except for the retinaculum.
• T2 Sh significantly reduced imaging time from 13 minutes for conventional 2D to 7 minutes.

Conclusions:

• T2 Shuffling is a feasible single-sequence MRI technique for pediatric knee examinations.
• This method provides multiplanar, reformattable 4D images, improving efficiency and potentially patient experience.