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Dosimetric Evaluation for Effect of Calibration Different CT Machines Parameters on dose Calculation Accuracy for Advance Radiotherapy Techniques |
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PP: 291- 297 |
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doi:10.18576/jrna/080311
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Author(s) |
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Esraa E. Mohamed,
Ehab M. Al-Kashif,
Khaled M. Elshahat,
Hussein M. Metwally,
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Abstract |
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| Data from a computed tomography (CT) scan serves as the foundational input for the radiotherapy treatment planning system (TPS), which incorporates the effects of inhomogeneities into dosage calculations. The factors unique to each scanner may have an impact on how CT numbers are measured. Thus, its critical to confirm how different CT scanning techniques affect the Hounsfield unit (HU) and how it affects dosage estimation. In this study, different three types of CT machines with the voltage application 80KVp to 140 KVp were examined for their effects on HU for various tissue replacements in phantoms as well as their dosimetric effects on dose computation in TPS due to variations in HU-relative electron density (RED) calibration curves. Using three CT machines scans of the phantom taken at various tube voltages, HU for various densities of materials was calculated Calibration curves for HU-RED. The same 120kVp values, no appreciable difference in HU of various density materials was found significant difference for three CT machines with 0.85% for dose calculation according to different types of CT machine. Doses that were computed using various HU-RED calibration curves were accurate to within 0.85%. The range of dose variations determined by algorithms using different HU-RED calibration curves was discovered to be well within 1.08%. Hence, it can be said that adopting a 120 KVp CT acquisition approach in clinical practice while using the standard HU-RED calibration curve is feasible. at different tube voltages. |
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