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3D Super-Resolution Motion-Corrected MRI: Validation of Fetal Posterior Fossa Measurements
Danielle B Pier1,2, Ali Gholipour3,4,2, Onur Afacan3,4,2
1Department of Neurology, Boston Children's Hospital, Boston, MA.
Purpose:
Current diagnosis of fetal posterior fossa anomalies by sonography and conventional MRI is limited by fetal position, motion, and by two-dimensional (2D), rather than three-dimensional (3D), representation. In this study, we aimed to validate the use of a novel magnetic resonance imaging (MRI) technique, 3D super-resolution motion-corrected MRI, to image the fetal posterior fossa.
Methods:
From a database of pregnant women who received fetal MRIs at our institution, images of 49 normal fetal brains were reconstructed. Six measurements of the cerebellum, vermis, and pons were obtained for all cases on 2D conventional and 3D reconstructed MRI, and the agreement between the two methods was determined using concordance correlation coefficients. Concordance of axial and coronal measurements of the transcerebellar diameter was also assessed within each method.
Results:
Between the two methods, the concordance of measurements was high for all six structures (P < .001), and was highest for larger structures such as the transcerebellar diameter. Within each method, agreement of axial and coronal measurements of the transcerebellar diameter was superior in 3D reconstructed MRI compared to 2D conventional MRI (P < .001).
Conclusions:
This comparison study validates the use of 3D super-resolution motion-corrected MRI for imaging the fetal posterior fossa, as this technique results in linear measurements that have high concordance with 2D conventional MRI measurements. Lengths of the transcerebellar diameter measured within a 3D reconstruction are more concordant between imaging planes, as they correct for fetal motion and orthogonal slice acquisition. This technique will facilitate further study of fetal abnormalities of the posterior fossa.
Insights
A new 3D super-resolution motion-corrected MRI technique accurately images the fetal posterior fossa. This advanced method shows high agreement with conventional MRI, improving fetal anomaly detection.
Area of Science:
- Medical Imaging
- Fetal Medicine
- Neuroimaging
Background:
- Conventional fetal MRI and sonography face limitations in diagnosing posterior fossa anomalies due to fetal movement and 2D imaging.
- Accurate fetal imaging is crucial for early detection of developmental abnormalities.
Purpose of the Study:
- To validate a novel 3D super-resolution motion-corrected MRI technique for imaging the fetal posterior fossa.
- To compare the accuracy of 3D MRI with conventional 2D MRI in fetal posterior fossa measurements.
Main Methods:
- Reconstruction of 49 normal fetal brain MRIs.
- Acquisition of six measurements for cerebellum, vermis, and pons using both 2D conventional and 3D reconstructed MRI.
- Assessment of measurement agreement using concordance correlation coefficients.
Main Results:
- High concordance (P < .001) was observed for all six measured structures between 2D and 3D MRI methods.
- The 3D reconstructed MRI showed superior agreement for transcerebellar diameter measurements between axial and coronal planes compared to 2D MRI (P < .001).
Conclusions:
- 3D super-resolution motion-corrected MRI is validated for fetal posterior fossa imaging, demonstrating high measurement concordance with 2D MRI.
- This technique improves accuracy by correcting for fetal motion and slice acquisition, aiding in the study of fetal posterior fossa abnormalities.
