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Semin Musculoskelet Radiol 2025; 29(02): 221-235
DOI: 10.1055/s-0045-1802660
Review Article

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

Aline Serfaty 
1   Medscanlagos Radiology, Cabo Frio, Rio de Janeiro, Brazil
,
Diogo Miguel Machado Pereira
2   Galaria Department of Radiology, Vigo University Hospital Complex, Vigo, Spain
,
Tatiane Cantarelli Rodrigues 
3   Department of Radiology, Hospital do Coração (HCor), São Paulo, São Paulo, Brazil
4   ALTA Diagnostic Center (DASA Group), São Paulo, São Paulo, Brazil
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Abstract

Spondyloarthritis (SpA) encompasses inflammatory disorders affecting the axial skeleton, with sacroiliitis as a hallmark feature of axial SpA (axSpA). Imaging plays a vital role in early diagnosis and disease monitoring. Magnetic resonance imaging (MRI) is the preferred modality for detecting early inflammatory changes in axSpA, whereas structural lesions are better visualized using computed tomography (CT). However, synthetic computed tomography (sCT), a technique that generates CT-like images from MRI data, including deep learning methods, zero echo time, ultrashort echo time, and gradient-recalled echo sequences, has emerged as an innovative tool. It offers detailed anatomical resolution without ionizing radiation and combines the advantages of both, MRI and CT, by enabling the simultaneous evaluation of inflammatory and structural lesions. This review explores the potential role of MRI-based sCT in assessing structural changes in the sacroiliac joints, particularly in the context of axSpA, discussing conventional imaging and highlighting the potential of sCT to enhance early detection and monitoring of sacroiliitis.

Keywords

synthetic computed tomography - spondyloarthritis - sacroiliac joints - magnetic resonance imaging - axial spondyloarthritis


Publication History

Article published online:
31 March 2025

© 2025. Thieme. All rights reserved.

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