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Local Institution comparison of patient effective dose using Cone Beam Computed Tomography and Multi Slice Computed Tomography for scaphoid clinical imaging
EP30707
Poster Title: Local Institution comparison of patient effective dose using Cone Beam Computed Tomography and Multi Slice Computed Tomography for scaphoid clinical imaging
Submitted on 07 Nov 2019
Author(s): Richard Farley
Affiliations: University Hospitals of Leicester NHS Trust
This poster was presented at BIR Annual Congress 2019
Poster Views: 73
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Poster Information
Abstract: The applications of Cone Beam Computed Tomography (CBCT) are increasing over time, originally for maxillofacial imaging and expanding to petrous, temporal bones and sinuses. More recently the use of CBCT technology for the assessment of scaphoid fractures has received increasing attention in the literature [1]. There is contradictory literature regarding whether CBCT represents a dose saving when compared to MSCT for scaphoid imaging [2, 3]. Therefore, patient dose was estimated for a newly installed CBCT system (Carestream CS 9600) to compare against Multi Slice Computed Tomography (MSCT). For this study Effective Dose (ED) was estimated using PCXMC [4] (computer simulation algorithm), by summing several projections in a CBCT rotation [5]. Information about the CBCT system, clinical protocols and assumed geometric conditions was used to estimate ED for different examinations. MSCT ED was estimated using DLP and the ImPACT calculator [6]. ED was estimated for adults (>15 years) to be in the range 4-9μSv for CBCT dependent on the protocol used and 59μSv for MSCT. For paediatric (5 to 15 years) patients the dose was in the range 6-22μSv for CBCT and was 41μv for MSCT. There is potentially a dose saving for scaphoid imaging using CBCT with the magnitude dependent on the settings. Optimisation of settings is required and justification should be based on image quality and clinical practicality as well as dose [7].Summary: Local Institution comparison of patient effective dose using Cone Beam Computed Tomography and Multi Slice Computed Tomography for scaphoid clinical imagingReferences: [1] Nardi, C. et al. (2018). Radiation dose in non-dental cone beam CT applications: a systematic
review. La Radiologia medica, 123(10), pp. 765-777
[2] Ludlow, JB. et al. (2018). Estimation of effective doses from MDCT and CBCT imaging of
extremities. J. Radiol Prot., 38(4), pp. 1371-1383
[3] Koivisto, J. et al. (2018). Effective Radiation Dose in the Wrist Resulting from a Radiographic
Device, Two CBCT Devices and One MSCT Device: A Comparative Study. Radiation protection
dosimetry, 179(1), pp. 58-68
[4] PCXMC 2.0, Radiation and Nuclear Safety Authority, Helsinki, Finland (Monte Carlo simulation
computer based software)
[5] Wood, TJ. et al. (2015). Validation of a technique for estimating organ doses for kilovoltage conebeam
CT of the prostate using the PCXMC 2.0 patient dose calculator. J. Radiol Prot., 35(1), pp. 152-
163
[6] ImPACT CT Patient Dosimetry Calculator 1.0.4 (2011), St. George's Healthcare NHS Trust, London,
UK
[7]
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