Determination of Calibration Cycle for Computed Tomography at Cancer Institute of Guyana
Abstract
Objective: The research aims to evaluate the optimum time for calibration cycle for the 4 slice GE lightspeed QXi CT unit. The workload and X-ray tube output were assessed in order to evaluate the performance of the X-ray tube. The Computed Tomography Dose Index (CTDI) and Dose Length Product (DLP) were the scan parameters assessed to evaluate X-ray tube output and was compared to the International Atomic Energy Agency (IAEA) standards.
Method: The CTDI phantom and a Raysafe X2 CT Calibration detector were used to obtain measured CTDI and DLP values for the common CT protocols (head, neck, sinus and chest). Peripheral CTDI phantom measurements were taken and compared to the displayed CTDI values for the scan protocols. CTDIair measurements were taken as a control and to confirm output consistency. Patient measurements were also done for comparative purposes. Exposure/electro-technical parameters were also recorded and compared. The workload of the institution was calculated for a time period of three months (January, February and March) in the year 2018. These measurements were compared to the National Council on Radiation Protection (NCRP 147) standards. A Geometric Distribution was conducted where the Raysafe X2 pencil ionization chamber was placed at varying distances from isocenter along the width of the scanner couch. Air measurements for Head and Abdomen protocols were measured and compared.
Results: The results obtained showed significant variations in CTDI readings…
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