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MRI-based pseudo-CT sequences as a radiation-free alternative to CT for obstetric pelvimetry: a proof-of-concept
Caroline Chabot1, Mathilde Haegeman1, Eya Chaouch1
1Department of Medical Imaging, Institut de Recherche Expérimentale et Clinique (IREC), Institut du Cancer Roi Albert II, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain (UCL), Brussels, Belgium.
European Radiology Experimental
|May 19, 2025
Summary
Radiation-free MRI sequences, including zero echo time (ZTE) and black bone (BB), offer reliable obstetric pelvimetry measurements. These pseudo-CT MRI techniques show good agreement with CT scans, presenting a promising alternative for pelvic diameter assessment.
Area of Science:
- Radiology
- Medical Imaging
- Obstetrics
Background:
- Pelvimetry is crucial for obstetric delivery planning.
- Computed tomography (CT) is standard but involves radiation.
- Magnetic resonance imaging (MRI) offers a radiation-free alternative using specialized sequences.
Purpose of the Study:
- Evaluate the reliability of MRI zero echo time (ZTE) and black bone (BB) sequences for pelvimetry.
- Assess the agreement of these MRI sequences with CT-based pelvimetry.
- Investigate the feasibility in a predominantly elderly female population.
Main Methods:
- Retrospective analysis of 21 female patients undergoing 3-T whole-body MRI with ZTE and BB sequences.
- Comparison with low-dose CT from 18F-FDG PET/CT.
- Measurement of obstetric conjugate diameter (OCD), interspinous diameter (ISD), and median transverse diameter (MTD) by five radiologists.
- Assessment of intra-reader, inter-reader, and inter-technique agreement using ICC and repeatability/reproducibility coefficients.
Main Results:
- Good intra-reader agreement for CT, BB, and ZTE sequences (ICC ≥ 0.90).
- Good inter-reader agreement across sequences (ICC ≥ 0.88).
- ZTE and BB sequences demonstrated good agreement with CT for pelvimetry measurements, comparable to CT's own repeatability.
Conclusions:
- MRI-based pseudo-CT sequences (ZTE and BB) provide reliable and reproducible measurements for obstetric pelvimetry.
- These radiation-free MRI techniques show good agreement with CT, suggesting a viable alternative.
- Further validation in pregnant populations is recommended.
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