Comparison of computed tomography dose index measuring by two detector types of computed tomography simulator

Authors

  • Prapa Sodkokkruad Department of Radiology, Faculty of Medicine Ramathibodi Hospital, Mahidol University
  • Sawwanee Asavaphatiboon Department of Radiology, Faculty of Medicine Ramathibodi Hospital, Mahidol University
  • Jiraporn Thanabodeebonsiri Department of Radiology, Faculty of Medicine Ramathibodi Hospital, Mahidol University
  • Puangpen Tangboonduangjit Department of Radiology, Faculty of Medicine Ramathibodi Hospital, Mahidol University

Keywords:

Computed tomography simulator, CTDIvol, Ionization chamber, Solid state detector

Abstract

Introduction: In general, the computed tomography screen displays the volume CT dose index (CTDIvol) received from a computed tomography by following the technique used. Verifying the display values is important before using them. This can be done by measuring the amount of radiation that is presented on the screen. However, there are 2 types of radiation detectors i.e., gas-filled and solid media types. These 2 detectors provide different methods of measurement and calculation. Objective: The purpose of this study was to compare the difference in CTDIvol values obtained from both detectors. Materials and methods: The CTDIvol was measured by using the ionization chamber and semiconductor detector in a phantom computed tomography 16 slices for Optima 580 simulation of GE Health Care Thailand. The CT setting parameters were based on the brain scan technique and the abdominal cavity using in the treatment planning simulation. The values obtained from the displayed on the screen of CT and measured from the detectors were compared and calculated as the percentage difference in CTDIvol. Results: Solid-state detector measured CTDIvol radiation less than conventional gas-filled detector. The different percentages were 10.20 and 5.02 for brain and abdominal cavity examination respectively. Conclusion: Radiation doses from computed tomography simulator measured by solid-state detector are less than those measured by standard gaseous radiation detector.

Downloads

Download data is not yet available.

References

American Association of Physicists in Medicine (AAPM) Report No.96 The Measurement, Reporting, and Management of Radiation Dose in CT. College Park: AAPM; 2008.

CIRS CT Dose Phantom. Chesterland: LACO, Inc; [updated 2017; cited 2017 May 15]. Available from: http://www.lacoonline.com/cgi-bin/lacoonline/00177.html.

International Atomic Energy Agency (IAEA) human health series No.19 Quality assurance programme for computed tomography diagnostic and therapy applications. Austria: IAEA; 2012.

National Council on Radiation Protection and Measurements. NCRP Report No. 99 Quality Assurance for Diagnostic Imaging. USA: NCRP; 1998.

Technical reports series No.457 Dosimetry in diagnostic radiology: an international code of practice. Austria: International Atomic Energy Agency (IAEA); 2007.

CT Dose Profiler user’s manual. Sweden: RTI ElectronicAB; 2015.

Grönlund E. Calibration & Clinical Measurements in Computed Tomography-An Evaluation of Different Dosimetric Methods: University of Gothamburk; 2013.

Published

2018-12-28

How to Cite

1.
Sodkokkruad ป, Asavaphatiboon เ, Thanabodeebonsiri จ, Tangboonduangjit พ. Comparison of computed tomography dose index measuring by two detector types of computed tomography simulator. Thai J Rad Tech [Internet]. 2018 Dec. 28 [cited 2022 May 27];43(1):64-8. Available from: https://he02.tci-thaijo.org/index.php/tjrt/article/view/246335

Issue

Section

Original articles