Zero Echo Time and Similar Techniques for Structural Changes in the Sacroiliac Joints

Area of Science:

• Radiology
• Medical Imaging
• Rheumatology

Background:

• Spondyloarthritis (SpA) involves axial skeleton inflammation, with sacroiliitis being key in axial SpA (axSpA).
• Early diagnosis and monitoring of axSpA rely heavily on imaging modalities.
• Magnetic resonance imaging (MRI) excels at detecting early inflammation, while computed tomography (CT) is superior for structural lesions.

Purpose of the Study:

• To review the potential of MRI-based synthetic computed tomography (sCT) for assessing sacroiliac joint structural changes in axSpA.
• To highlight sCT's advantages over conventional imaging for evaluating both inflammatory and structural lesions.

Main Methods:

• Exploration of MRI-based synthetic computed tomography (sCT) techniques, including deep learning, zero echo time, ultrashort echo time, and gradient-recalled echo sequences.
• Discussion of conventional MRI and CT imaging for sacroiliitis.
• Review of sCT's capability to generate CT-like images from MRI data.

Main Results:

• Synthetic computed tomography (sCT) provides detailed anatomical resolution without ionizing radiation.
• sCT enables simultaneous evaluation of both inflammatory and structural lesions in the sacroiliac joints.
• This dual assessment capability enhances the potential for early detection and monitoring of sacroiliitis.

Conclusions:

• MRI-based sCT is an innovative tool with significant potential in the assessment of structural sacroiliitis in axSpA.
• sCT combines the strengths of MRI and CT, offering a comprehensive, radiation-free imaging solution.
• Further research into sCT could revolutionize the early diagnosis and management of axial spondyloarthritis.