A Study of the Quantitative Assessment of Radiation Dose Out Put for Tomography View of the Dental Cone Beam Computed Tomography (CBCT) System

James Anthony Rabba; Noor Diyana Osman; Hanis Arina Jaafar; Mohd Zubir Mat Jafri; Fatanah Mohamad Suhaimi; Felix Omachoko Uloko

doi:10.62292/njap-v2i2-2026-49

Authors

James Anthony Rabba
james.rabba@fulokoja.edu.ng

Federal University Lokoja
Noor Diyana Osman
University of Science Malaysia
Hanis Arina Jaafar
University of Science Malaysia
Mohd Zubir Mat Jafri
University of Science Malaysia
Fatanah Mohamad Suhaimi
University of Science Malaysia
Felix Omachoko Uloko
Federal University Lokoja

Keywords:

CBCT, CT dose index, Computed tomography dosimetry, Computed tomography phantom, Imaging

Abstract

The efficiency of machine operation in radiology has been established to be affected by many factors, such as the device used, and the exposure level adopted for a specific type of radiation. The radiation exposure from cone beam computed tomography (CBCT) system is generally higher than that of other diagnostic modalities such as X-ray and computed tomography (CT) scan. This study aims to determine patient dosimetry on CBCT scanners used in Advanced Medical and Dental Institute (AMDI) University Sains Malaysia (USM). The CTDI phantom was scanned using the common exposure settings used in clinical routine (90 kVp, 8 mA) with a full rotation scan. For the standard CTDI method, the dosimeter was placed to measure the doses at the central hole (CTDIc) and the four peripheral holes (CTDI_p) of the phantom making a total of five measurement points in the scanning field of view. The percent deviation of the recorded doses at the peripheral points were observed to range from 0.7 % to 10 %. The highest average dose was observed at the hole C which is about 90° and with a position near the x-ray tube. Furthermore, the measured value was 3.286 mGy which was within the expected range of ( which is the value obtainable in most standard scanning protocols. The difference between the displayed and measured CTDI_vol value was 0.814 (19.85 %) which was observed to be within 20 %, which is comparable to that of the Swiss legal requirements (within a 20 % threshold limit) and the American Association of Physicist in Medicine (AAPM) report 204 of approximately 20%. This study showed the effectiveness of CTDI as a dose index in CBCT scans and also that the CBCT scanner in AMDI USM poses no risk to the patients.

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A Study of the Quantitative Assessment of Radiation Dose Out Put for Tomography View of the Dental Cone Beam Computed Tomography (CBCT) System

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