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This study investigated a practical method for obtaining reference Computed Tomography Dose Index (CTDI) measurements on a CBCT system by introducing an external tungsten slit to generate a narrow beam compatible with the adopted dosimetry formalisms. Computed tomography air-kerma index measurements were performed using a 10-cm pencil ionization chamber, and dose-area product (DAP) values were obtained directly from the CBCT unit. The effective beam width was determined from projection images, and the system\u2019s geometric behaviour was characterized to support future modelling. A conversion factor between CTDI and DAP was derived for a head phantom, illustrating the feasibility and limitations of applying CTDI methodology to CBCT. The findings provide experimental data and geometric information that may support future Monte Carlo simulations and contribute to more standardized CBCT dose assessment.<\/jats:p>","DOI":"10.1093\/rpd\/ncaf189","type":"journal-article","created":{"date-parts":[[2025,12,23]],"date-time":"2025-12-23T12:49:57Z","timestamp":1766494197000},"page":"422-428","source":"Crossref","is-referenced-by-count":0,"title":["Advancing dosimetry in cone-beam computed tomography: methodologies and key findings"],"prefix":"10.1093","volume":"202","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4193-5390","authenticated-orcid":false,"given":"Adnan","family":"Beganovi\u0107","sequence":"first","affiliation":[{"name":"Department of Radiation Protection and Medical Physics, Clinical Center of the University of Sarajevo , Bolni\u010dka 25, Sarajevo 71000,","place":["Bosnia and Herzegovina"]},{"name":"Faculty of Science, University of Sarajevo , Zmaja od Bosne 33\u201335, Sarajevo 71000,","place":["Bosnia and Herzegovina"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert","family":"Vujica","sequence":"additional","affiliation":[{"name":"Department of Radiation Protection and Medical Physics, Clinical Center of the University of Sarajevo , Bolni\u010dka 25, Sarajevo 71000,","place":["Bosnia and Herzegovina"]},{"name":"Klinikum Bayreuth GmbH , Preuschwitzer Str. 101, Bayreuth 95445,","place":["Germany"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Branka","family":"Metli\u0107","sequence":"additional","affiliation":[{"name":"Department of Radiation Protection and Medical Physics, Clinical Center of the University of Sarajevo , Bolni\u010dka 25, Sarajevo 71000,","place":["Bosnia and Herzegovina"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Armin","family":"Durakovi\u0107","sequence":"additional","affiliation":[{"name":"Department of Medical Physics and Radiation Protection, Cantonal Hospital Zenica , Crkvice 67, Zenica 72000,","place":["Bosnia and Herzegovina"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mahira","family":"Red\u017ei\u0107","sequence":"additional","affiliation":[{"name":"Department of Radiation Protection and Medical Physics, Clinical Center of the University of Sarajevo , Bolni\u010dka 25, Sarajevo 71000,","place":["Bosnia and Herzegovina"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Senad","family":"Od\u017eak","sequence":"additional","affiliation":[{"name":"Faculty of Science, University of Sarajevo , Zmaja od Bosne 33\u201335, Sarajevo 71000,","place":["Bosnia and Herzegovina"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Almasa","family":"Od\u017eak","sequence":"additional","affiliation":[{"name":"Faculty of Science, University of Sarajevo , Zmaja od Bosne 33\u201335, Sarajevo 71000,","place":["Bosnia and Herzegovina"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2026,3,13]]},"reference":[{"key":"2026031302442706100_ref1","first-page":"75","article-title":"Clinical applications of cone-beam computed tomography in dental practice","volume":"72","author":"Scarfe","year":"2006","journal-title":"J Can Dent Assoc"},{"key":"2026031302442706100_ref2","volume-title":"Cone Beam Computed Tomography","author":""},{"key":"2026031302442706100_ref3","doi-asserted-by":"publisher","first-page":"20190157","DOI":"10.1259\/dmfr.20190157","article-title":"IAEA survey of dental cone beam computed tomography practice and related patient exposure in nine central and eastern European countries","volume":"49","author":"Beganovi\u0107","year":"2020","journal-title":"Dentomaxillofac Radiol"},{"key":"2026031302442706100_ref4","doi-asserted-by":"publisher","first-page":"193","DOI":"10.1016\/j.ejmp.2021.07.007","article-title":"Dental cone beam CT: an updated review","volume":"88","author":"Kaasalainen","year":"2021","journal-title":"Phys Med"},{"key":"2026031302442706100_ref5","first-page":"286","article-title":"Radiation dosimetry in computed tomography (CT)","volume-title":"Application of Optical Instrumentation in MedicineVI, Proc. 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