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Congress: ECR25
Poster Number: C-23680
Type: Poster: EPOS Radiologist (scientific)
Authorblock: S. M. R. S. Islam1, A. Biguri2, C. Landi3, G. Di Domenico4, P. Grün5, D. Turhani5, G. Kronreif1, W. Birkfellner6, S. Hatamikia7; 1Wiener Neustadt/AT, 2Cambridge/UK, 3Via Bolgara 2, Brusaporto (BG)/IT, 4Ferrara/IT, 5Steiner Landstraße 124, Krems/AT, 6Vienna/AT, 7Krems/AT
Disclosures:
S M Ragib Shahriar Islam: Nothing to disclose
Ander Biguri: Nothing to disclose
Claudio Landi: Nothing to disclose
Giovanni Di Domenico: Nothing to disclose
Pascal Grün: Nothing to disclose
Dritan Turhani: Nothing to disclose
Gernot Kronreif: Nothing to disclose
Wolfgang Birkfellner: Nothing to disclose
Sepideh Hatamikia: Nothing to disclose
Keywords: Interventional non-vascular, Cone beam CT, Digital radiography, CAD, Cost-effectiveness, Experimental investigations, Image verification, Kv imaging
Purpose Cone Beam Computed Tomography (CBCT) is an increasingly popular imaging technique for dental clinics, widely used for pre-operative planning and observation. Its popularity stems from: Low-cost imaging Compact, flexible design, easy mobility and maintenance Despite these advantages, CBCT systems have a significant limitation: The small field of view (FOV) due to the restricted circular source-detector movement This limitation results in insufficient planning data for treatment experts. [fig 1] Current solutions and their challenges: Using a larger detector: Advantage: Expands the FOV Challenge: Increases imaging costs, as larger detectors are expensive Shifted...
Read more Methods and materials Digital Imaging Phantom: A digital anthropomorphic head phantom was utilized for computational analysis. Naso-occipital length: 23 cm Cranial breadth: 16 cm [fig 2] Device Geometry: The CBCT unit has the following geometry: Isocenter-to-source distance: 38 cm Isocenter-to-detector distance: 17 cm A translational isocenter movement space was designed, taking into account kinematic constraintsconsidering the detector movement. This space is an 11 × 6 cm rectangular isocenter movable area starting 1 cm behind the bite point. With this geometry, currently only a limited-angle circular scan (approximately 270°) is achievable. [fig 3] Source-Detector Trajectory Development:...
Read more Results Reconstructed Images and Extended Field of View (FOV): The FOV for the limited-angle circular scan (in the axial plane) was a circle with a diameter of 11 cm. Using the proposed trajectory, the reconstructed volume expanded to approximately 15 cm in cranial breadth and 19.5 cm in the naso-occipital length. This represents an FOV increase of approximately 77%. [fig 7] The following animated graphics provide a comparative illustration of the reconstructed images obtained using limited-angle circular scan data and the proposed fusion trajectory scan data, alongside the...
Read more Conclusion The proposed trajectory demonstrates significant potential to expand the FOV while maintaining excellent image quality. It achieves FOV expansion algorithmically, eliminating the need for hardware upgrades or new device installations, thus incurring no additional costs. Although it requires the gantry to rotate two times, it does not require more projections than the limited angle circular scan. Future work will focus on conducting clinical tests to further refine and validate the proposed method.
Read more References [1] Islam S M Ragib Shahriar, et al. “Source-detector trajectory optimization for FOV extension in dental CBCT imaging.” Computational and Structural Biotechnology Journal. 2024 Dec 1;24:679-89.[2] Li Tianfang, et al. “A novel off-axis scanning method for an enlarged ellipse cone-beam computed tomography field of view.” Medical Physics. 2010 Dec;37(12):6233-9.[3] Tuy Heang K. “An inversion formula for cone-beam reconstruction.” SIAM Journal on Applied Mathematics. 1983 Jun;43(3):546-52.[4] Biguri A, et al. “TIGRE: a MATLAB-GPU toolbox for CBCT image reconstruction.” Biomedical Physics & Engineering Express. 2016...
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