Zero echo time pediatric musculoskeletal magnetic resonance imaging: initial experience

Area of Science:

• Radiology
• Medical Imaging
• Orthopedics

Background:

• Conventional radiography (XR) and CT are used for bone assessment, while MRI is used for soft tissues.
• Zero echo time (ZTE) MRI offers CT-like contrast for bone structures, potentially reducing the need for CT scans.

Purpose of the Study:

• To evaluate the initial implementation of an isotropic ZTE MRI sequence for pediatric musculoskeletal examinations.
• To assess the diagnostic quality and anatomical delineation of ZTE MRI compared to conventional CT and XR.

Main Methods:

• Pediatric patients underwent ZTE MRI at 3 Tesla for extremity examinations.
• Image quality was assessed using a 5-point scale for anatomical delineation (S_anat) and comparison (S_comp) with conventional CT/XR.
• Cortical thickness and pathology visualization were quantitatively and qualitatively evaluated.

Main Results:

• ZTE MRI demonstrated diagnostic or better cortical delineation in all cases (100% CI).
• ZTE MRI showed comparable cortical thickness and pathology visualization to conventional CT and XR.
• Non-displaced fractures showed improved delineation on ZTE-XR compared to conventional radiography.

Conclusions:

• Diagnostic-quality ZTE MRI is feasible for pediatric musculoskeletal imaging, complementing conventional MRI sequences.
• ZTE MRI offers comparable visualization of bone and pathology to conventional CT, with potential benefits for fracture delineation.