Manuscript Number : IJSRSET1736222
Evaluation and Validation of Computed Tomography Dose Accuracy(CTDIw AND CTDIvol)
Authors(4) :-Abrokwa Sintim, Edem Sosu, Francis Hasford, Augustine Kyere
Weighted and average dose within a scan volume of a phantom have been evaluated and validated using two different devices and techniques. The Barracuda electrometer and Ion Chamber techniques were applied on a 16 slice Siemens CT scanner and the results compared to the console displayed CTDIw and CTDIvol values for accuracy and compared to each other for validation purposes. With fixed exposure parameter of 130kVp and varying tube current-time products from 140mAs to 300mAs for the CT head phantom examination, there were varying deviations in both the CTDIw and CTDIvol from the two techniques. Tube currents of 140 mAs, 240 mAs and 300 mAs yielded 3.5%, 0.61% and -6.45% deviations when the respective CTDIvol values for both techniques were compared. There were mean CTDIvol of (42.3 + 8.6) mGy and (42.1 + 8.1) mGy for Barracuda and Ion Chamber techniques respectively with an average deviation of 1.4 mGy between them, when the tube current-time products were varied from 140 – 300 mAs for the head phantom examination. Tube current-time products ranging from 80mAs – 220mAs were used for the CT body phantom examination and mean CTDIw measured were (16.6 + 6.7) mGy and (16.5 + 7.7) mGy for Barracuda and Ion Chamber techniques respectively with an average deviation of 1.0 mGy between them. The results of the study showed that the deviations from the techniques were within a range of CTDIw and CTDIvol values which were favorably comparable to other similar retrospective research works, thus, the Ion Chamber technique can be used in place of the technique currently in use.
Abrokwa Sintim
Computed Tomography Dose Index (CTDI), Exposure (X), Dose Profiler Probe, Temperature and Pressure Correction Factor (PTP)
Publication Details
Published in :
Volume 3 | Issue 6 | September-October 2017
Department of Medical Physics, School of Nuclear and Allied Sciences, University of Ghana, Accra, Ghana
Edem Sosu
Medical Radiation Physics Centre, Radiological and Medical Sciences Research Institute, Ghana Atomic Energy
Commission, Accra, Ghana
Francis Hasford
Department of Medical Physics, School of Nuclear and Allied Sciences, University of Ghana, Accra, Ghana
Augustine Kyere
Department of Medical Physics, School of Nuclear and Allied Sciences, University of Ghana, Accra, Ghana
Date of Publication :
2017-10-31
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Page(s) :
999-1007
Manuscript Number :
IJSRSET1736222
Publisher : Technoscience Academy