Abstract
Purpose
Cranial stereotactic radiotherapy (SRT) requires highly accurate lesion delineation. However, MRI can have significant inherent geometric distortions. We investigated how well the Elements Cranial Distortion Correction algorithm of Brainlab (Munich, Germany) corrects the distortions in MR image-sets of a phantom and patients.
Methods
A non-distorted reference computed tomography image-set of a CIRS Model 603-GS (CIRS, Norfolk, VA, USA) phantom was acquired. Three-dimensional T1-weighted images were acquired with five MRI scanners and reconstructed with vendor-derived distortion correction. Some were reconstructed without correction to generate heavily distorted image-sets. All MR image-sets were corrected with the Brainlab algorithm relative to the computed tomography acquisition. CIRS Distortion Check software measured the distortion in each image-set. For all uncorrected and corrected image-sets, the control points that exceeded the 0.5-mm clinically relevant distortion threshold and the distortion maximum, mean, and standard deviation were recorded. Empirical cumulative distribution functions (eCDF) were plotted. Intraclass correlation coefficient (ICC) was calculated. The algorithm was evaluated with 10 brain metastases using Dice similarity coefficients (DSC).
Results
The algorithm significantly reduced mean and standard deviation distortion in all image-sets. It reduced the maximum distortion in the heavily distorted image-sets from 2.072 to 1.059 mm and the control points with > 0.5-mm distortion fell from 50.2% to 4.0%. Before and especially after correction, the eCDFs of the four repeats were visually similar. ICC was 0.812 (excellent–good agreement). The algorithm increased the DSCs for all patients and image-sets.
Conclusion
The Brainlab algorithm significantly and reproducibly ameliorated MRI distortion, even with heavily distorted images. Thus, it increases the accuracy of cranial SRT lesion delineation. After further testing, this tool may be suitable for SRT of small lesions.
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Acknowledgements
We thank Dr. Yinka Zevering of SciMeditor Medical Writing and Editing Services for assistance with the manuscript. We also thank Mircea Lazea from CIRS (CIRS, Norfolk, VA, USA) for sharing all the technical information about the Distortion Check software.
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All authors certify that they have been included in substantial contributions to the conception or design of the work (all authors); or the acquisition (Paul Retif, Abdourahamane Djibo Sidikou, and Christian Mathis), analysis (Paul Retif, Abdourahamane Djibo Sidikou, and Xavier Michel), or interpretation of data for the work (Paul Retif and Abdourahamane Djibo Sidikou); or drafting the work or revising it critically for important intellectual content (all authors). Final approval of the version to be published was given by all authors, as was agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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P. Retif, A. Djibo Sidikou, C. Mathis, R. Letellier, E. Verrecchia-Ramos, R. Dupres, and X. Michel declare that they have no competing interests. None of the authors has a professional or personal relationship with Brainlab (Munich, Germany), which produced the Brainlab Elements Cranial Distortion Correction algorithm.
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Retif, P., Djibo Sidikou, A., Mathis, C. et al. Evaluation of the ability of the Brainlab Elements Cranial Distortion Correction algorithm to correct clinically relevant MRI distortions for cranial SRT. Strahlenther Onkol 198, 907–918 (2022). https://doi.org/10.1007/s00066-022-01988-1
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DOI: https://doi.org/10.1007/s00066-022-01988-1