TLD measurements and Monte Carlo calculations of head and neck organ and effective doses for Cone Beam Computed Tomography using 3D Accuitomo 170.

Ernst, Marina; Manser, Peter; Dula, Karl; Volken, Werner; Stampanoni, Marco; Fix, Michael (2017). TLD measurements and Monte Carlo calculations of head and neck organ and effective doses for Cone Beam Computed Tomography using 3D Accuitomo 170. Dento maxillo facial radiology, 46(7), p. 20170047. British Institute of Radiology 10.1259/dmfr.20170047

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OBJECTIVES

In dentistry the use of Cone Beam Computed Tomography (CBCT) has steadily increased over the last few years. The aim of this study was to measure organ doses and to perform dose calculations based on Monte Carlo (MC) simulations to work out a basis for full 3D dose calculations for any patient examination performed with the machine used in this study.

METHODS

TLD-100 LiF detectors were placed at 71 measurement positions on the surface and within a RT-Humanoid phantom to cover all relevant radiosensitive organs and tissues. Three examinations with different protocols were performed with the 3D-Accuitomo® and dose calculations with MC simulations were carried out for the same three protocols using the EGSnrc MC transport code system.

RESULTS

Field of views (FOV) of 140×100 mm(2), 80 ×50mm(2) and 40×40 mm(2) were selected, the mean organ doses were measured as 5.2 mGy, 2.75 mGy and 1.5 mGy and the effective doses were determined as 250 μSv, 97 μSv and 48 μSv. For the MC simulation of organ doses and the TLD measurements an overall agreement within ±10.1% (two standard deviations) was achieved. The measured dose values for 3D-Accuitomo® were about a factor 2 lower when compared to conventional CT examinations.

CONCLUSIONS

Reliable results for the organ doses as well as effective dose values were achieved with TLD measurements in the RT-Humanoid phantom. This study provides the basis for the application of MC simulations for further dose determinations of CBCT-machines. The MC calculation may therefore be a valuable tool to support the dentists in the evaluation of the trade off between additional information that may be relevant to the choice of therapy and the additional dose given to the patient.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > School of Dental Medicine > Department of Oral Surgery and Stomatology 04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Clinic of Radiation Oncology > Medical Radiation Physics
UniBE Contributor:	Manser, Peter, Dula, Karl, Volken, Werner, Fix, Michael
Subjects:	600 Technology > 610 Medicine & health
ISSN:	0250-832X
Publisher:	British Institute of Radiology
Language:	English
Submitter:	Beatrice Scheidegger
Date Deposited:	23 Feb 2018 15:17
Last Modified:	05 Dec 2022 15:07
Publisher DOI:	10.1259/dmfr.20170047
PubMed ID:	28749697
URI:	https://boris.unibe.ch/id/eprint/105287