全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

Quality Control and Optimization of Computed Tomography Dose Index Volume (CTDIvol) of LightSpeed RT16 Xtra CT Scanner

DOI: 10.4236/ijmpcero.2025.141001, PP. 1-13

Keywords: Quality Control, CTDIvol, LightSpeed RT16 Xtra CT Scanner, Phantom

Full-Text   Cite this paper   Add to My Lib

Abstract:

Dose estimation and quality control in computed tomography (CT) scanners are useful in controlling the dose of radiation given to patients while tests are carried out. The study was performed in a 16-slice Computed Tomography (CT) system of LightSpeed RT16 Xtra CT scanner. Quality control was done using a vendor-provided QA Phantom, and the six aspects of image quality were measured. For CT dosimetry, Computed Tomography Dose index volume (CTDIvol) was performed using Computed Tomography Dose Index (CTDI) Phantom. CTDI Phantom consists of three parts: Pediatric Head, Adult Head, and Adult Body Phantom. A 10 cm long pencil ion chamber DCT-10 was used to measure the dose at different positions inside the CTDI Phantom. Data were collected using MagicMax Universal software. For dose estimation of the CTDIvol Report of AAPM Task Group, 96 and 111 formalisms were used. For Pediatric Head, Adult Head, and Adult Body Phantom the measured CIDIvol was 61.04 mGy, 48.11 mGy, and 18.08 mGy respectively. The study has shown deviations of 7%, 15%, and 19% between estimated and console-displayed doses for Pediatric Head, Adult Head, and Adult Body scan techniques respectively. The six aspects of image quality measured by QA Phantom were found to be compatible with the specifications of the machine and CTDIvol measured by CTDI Phantom were found within a tolerance limit of ±20%. Hence, the QC and dosimetry of the mentioned machine are within the limit.

References

[1]  Anam, C., Haryanto, F., Widita, R., Arif, I. and Dougherty, G. (2016) A Fully Automated Calculation of Size-Specific Dose Estimates (SSDE) in Thoracic and Head CT Examinations. Journal of Physics: Conference Series, 694, Article ID: 012030.
https://doi.org/10.1088/1742-6596/694/1/012030
[2]  International Commission on Radiological Protection (2007) ICRP Publication 103. Annals of the ICRP.
[3]  Jerrold, T. and Bushberg, J.A. (2012) The Essential Physics of Medical Imaging. 3rd Edition, Lippincott Williams & Wilkins.
[4]  Gulliksrud, K., Stokke, C. and Trægde Martinsen, A.C. (2014) How to Measure CT Image Quality: Variations in Ct-Numbers, Uniformity and Low Contrast Resolution for a CT Quality Assurance Phantom. Physica Medica, 30, 521-526.
https://doi.org/10.1016/j.ejmp.2014.01.006
[5]  McCollough, C.H. (2012) CT Dose: How to Measure, How to Reduce. Health Physics, 95, 508-517.
[6]  Nickoloff, E.L., Dutta, A.K. and Lu, Z.F. (2003) Influence of Phantom Diameter, KVP and Scan Mode Upon Computed Tomography Dose Index. Medical Physics, 30, 395-402.
https://doi.org/10.1118/1.1543149
[7]  General Electric LightSpeedTMRT16 (2008) Xtra CT Scanner Manual.
[8]  Bauhs, J.A., Vrieze, T.J., Primak, A.N., Bruesewitz, M.R. and McCollough, C.H. (2008) CT Dosimetry: Comparison of Measurement Techniques and Devices. RadioGraphics, 28, 245-253.
https://doi.org/10.1148/rg.281075024
[9]  Hasford, F., Van Wyk, B., Mabhengu, T., Vangu, M.D.T., Kyere, A.K. and Amuasi, J.H. (2015) Determination of Dose Delivery Accuracy in CT Examinations. Journal of Radiation Research and Applied Sciences, 8, 489-492.
https://doi.org/10.1016/j.jrras.2015.05.006
[10]  American College of Radiology (ACR) (2024) CT Accreditation Phantom Instruction, Radiation Dosimetry: CT.
[11]  AAPM Report No. 96 (2008) The Measurement, Reporting, and Management of Radiation Dose in CT. Report of AAPM TaskGroup 23 of the Diagnostic Imaging Council CT Committee. American Association of Physicists in Medicine (AAPM).
[12]  Report of AAPM Task Group 111 (2010) The Future of CT Dosimetry. Comprehensive Methodology for the Evaluation of Radiation Dose in X-Ray Computed Tomography. American Association of Physicists in Medicine (AAPM).

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133