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Congress: ECR25
Poster Number: C-21420
Type: Poster: EPOS Radiologist (scientific)
Authorblock: K. Merken, R. Massera, W. Michiels, H. Bosmans; Leuven/BE
Disclosures:
Karen Merken: Nothing to disclose
Rodrigo Massera: Nothing to disclose
Wouter Michiels: Nothing to disclose
Hilde Bosmans: Other: Research agreement with NewTom (CEFLA SC, Imola, Italy)
Keywords: Extremities, Head and neck, Cone beam CT, Dosimetry, Quality assurance
Purpose Cone-Beam Computed Tomography (CBCT) imaging has been demonstrated to be a suitable imaging technique for high contrast applications which concurrently prefer high, and possibly also isotropic, image resolution for the visualization of submillimeter anatomical features [1]. As a consequence, CBCT has shown to be an excellent candidate for use in extremity, dento-maxillofacial as well as Ear, Nose and Throat (ENT) imaging. Hence during the last decade, there has been an increasing use of this imaging modality in clinical practice for...
Read more Methods and materials Patient dosimetry frameworkIn order to estimate patient effective dose levels, absorbed organ doses need to be measured. Traditionally, measurements with thermoluminescent dosimeters (TLDs) distributed at several locations within anthropomorphic phantoms are often used for this purpose [4]. However, this method requires the use of many TLDs, making it very time-consuming. In addition, the necessary phantoms are not always easily accessible. However, an alternative approach to estimate organ doses, would be to perform Monte Carlo (MC) simulations [4]. In a previous...
Read more Results Fig 3 and 4 give the obtained patient effective dose levels in case of the regular scan mode, showing the results for the dento-maxillofacial/ENT and extremity imaging applications, respectively. Fig 5 and 6 display the results for the best scan mode. [fig 3] [fig 4] [fig 5] [fig 6] For all the studied protocols, a decreasing trend as a function of patient age could be observed. Most often, similar dose levels were obtained for the 15 year old and adult patient models. In addition, both the LE and HE...
Read more Conclusion This was one of the first studies to provide patient effective dose levels for DE extremity, dento-maxillofacial and ENT CBCT imaging, for adult as well as pediatric patients, based on Monte Carlo simulations. The obtained dose levels can be considered acceptable, particularly since this is, to the author’s best knowledge, the first commercially available model on the European market. Further introduction of this new imaging modality into clinical practice, will possibly enable future clinical application specific dose optimization studies.
Read more References [1] R. Fahrig, D. A. Jaffray, I. Sechopoulos, and J. Webster Stayman, “Flat-panel conebeam CT in the clinic: history and current state,” J. Med. Imaging, vol. 8, no. 5, pp. 1–40, 2021.[2] E. Samei and N. J. Pelc, Eds., Computed Tomography: Approaches, Applications and Operations. 2019.[3] C. Altunbas, “Feasibility of dual-energy CBCT material decomposition in the human torso with 2D anti-scatter grids and grid-based scatter sampling,” Med. Phys., vol. 51, no. 1, pp. 334–347, Jan. 2024.[4] A. Stratis, G. Zhang,...
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