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Organ dose in CT: Comparison between measurements and computational methods.
Martina Pace1, Elisa Bonanno1, Giuseppina Rita Borzì1
1Medical Physics Department, Humanitas Istituto Clinico Catanese, Misterbianco, CT, Italy.
Radiochromic film EBT-3 shows potential for computed tomography (CT) organ dose evaluation, offering lower angular dependence than XR-QA2. This makes EBT-3 suitable for CT patient dosimetry in head and thorax regions.
Area of Science:
- Medical Physics
- Radiological Dosimetry
Background:
- Accurate organ dose evaluation in computed tomography (CT) is crucial for patient safety.
- Radiochromic films are experimental tools for dose measurement, but their angular dependence can affect accuracy.
- Computational software offers an alternative for dose assessment, but requires validation.
Purpose of the Study:
- To compare the performance of two radiochromic films, Gafchromic® XR-QA2 and EBT-3, against a commercial software for organ dose evaluation in CT.
- To assess the dosimetric characteristics of XR-QA2 and EBT-3 films, including their response to varying energy, angle, and irradiation configurations.
- To validate computational dose assessment methods using experimental film dosimetry data.
Main Methods:
- Characterization of XR-QA2 and EBT-3 films under different irradiation conditions (energy, angle, configuration).
- Calibration using free-in-air irradiation with orthogonal (OC) and parallel (PC) configurations.
- Irradiation of films within anthropomorphic head and thorax phantoms using standard CT protocols.
- Comparison of organ dose values obtained from films with those from commercial CT dosimetry software.
Main Results:
- EBT-3 films demonstrated consistent dose response across different configurations, while XR-QA2 showed a 15% variation.
- XR-QA2 exhibited a beam quality (BQ) response variation below 10%, whereas EBT-3 varied below 5% for doses >20 mGy.
- At a 90° irradiation angle, EBT-3 showed significantly lower relative response (83%) compared to XR-QA2 (41%), indicating reduced angular dependence.
- Organ dose values from EBT-3 and XR-QA2 (OC) agreed with reference data within 25% discrepancy.
Conclusions:
- EBT-3 films are a promising tool for CT patient dosimetry due to their minimal angular dependence.
- The lower angular sensitivity of EBT-3 compensates for its lower sensitivity in the diagnostic dose range.
- Experimental validation using EBT-3 films supports the reliability of computational dosimetry methods in CT.
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