Program Information
Evaluation of MR-Based Image with Implants From CT Segmentation in Radiotherapy Using Dedicated CT/MR Oral Phantom
M Lee1,2*, K Song1,2 , J Lee3 , B Choe1,2 , T Suh1,2 , (1) Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea,(2) Research Institute of Biomedical Engineering, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea , (3) Department of Radiation Oncology, Konkuk University Medical Center, Seoul, Republic of Korea
Presentations
SU-K-601-8 (Sunday, July 30, 2017) 4:00 PM - 6:00 PM Room: 601
Purpose: Recently, the number of patients with oral disease who have been treated with fixed orthodontic appliances and referred for MR imaging has increased. The aims of this study were (a) to develop a computed tomography (CT)/ magnetic resonance (MR) oral phantom and designed containers with insert-able dental implants; (b) to optimize parameters for metal artifact reduction by multi modal system; (c) to register CT/MR to generate non-artifact MR image with teeth restorations.
Methods: The phantom comprises sphere which shaped to simulate the anatomical structures of a human head with real teeth and dental implants. All measurements were done using a human 3T MRI with spin echo (SE) and gradient echo (GRE) sequences image scan together with CT high resolution image. Firstly, the metal regions and normal teeth parts are extracted with a suitable threshold from an initial image reconstructed without metal artifacts reduction from the CT images. Secondly, corrected metal projection regions of MR images and finally, CT images are applied into artifact-reduced MR images.
Results: The dedicated CT/MR phantom was performed to assess the magnitude and spatial dependence of MR image geometrical distortion and CT artifact accuracy in various sequences. After CT/MR registration, spin echo sequence presented 12.0 mm and 24.0 mm differences in X and Y axes and gradient echo sequence showed 18.0 mm and 36.6 mm differences in X and Y axes.
Conclusion: The dedicated phantom provides a unique and useful tool in head and neck research in offering references of metal artifact reduction and registration methods for multi-modality medical images. Therefore, the contrast-enhanced dental MR image offers a means of visualizing the different anatomical structures in diagnostic system which also links to image clarity of radiotherapy planning process to attracts tumor delineation.
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