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COMPARISON OF ORGAN ABSORBED DOSES IN WHOLE-BODY COMPUTED TOMOGRAPHY SCANS OF PAEDIATRIC AND ADULT PATIENT MODELS
Larisa Chipiga1,2,3, Vladislav Golikov1, Aleksandr Vodovatov1
1Research Institute of Radiation Hygiene, 197101, Mira St 8, St. Petersburg, Russian Federation.
Radiation Protection Dosimetry
|June 16, 2021
Summary
This study validated organ absorbed dose software by comparing estimations with phantom measurements. Results show software is suitable for accurate dose estimation in computed tomography (CT) scans.
Area of Science:
- Medical Physics
- Radiological Dosimetry
- Computational Modeling
Background:
- Accurate estimation of organ absorbed dose is crucial for radiation protection in medical imaging.
- Computed tomography (CT) is widely used, necessitating reliable dosimetry methods.
- Dedicated software tools are increasingly employed for dose estimation, but their accuracy requires validation.
Purpose of the Study:
- To identify uncertainties in organ absorbed dose estimations by dedicated software.
- To compare software-based dose estimations with physical measurements in anthropomorphic phantoms.
- To evaluate the suitability of different software programs for whole-body CT dosimetry.
Main Methods:
- Comparison of organ absorbed doses estimated by CT-Expo, VirtualDose, and NCICT software.
- Thermoluminescent detector (TLD) measurements were performed in anthropomorphic phantoms representing pediatric and adult patients.
- Whole-body CT scans were acquired for dosimetry comparison, ensuring all organs were within the primary beam.
Main Results:
- Differences between software estimations and phantom measurements were within approximately 15% for 12 major organs.
- Discrepancies of approximately 30% were observed in organs with positional differences between computational models and physical phantoms.
- All investigated software programs demonstrated suitability for accurate organ absorbed dose estimation.
Conclusions:
- Dedicated software for organ absorbed dose estimation in whole-body CT is generally accurate.
- Positional variations between computational models and physical phantoms can introduce significant dose estimation uncertainties.
- The validated software tools are suitable for assessing organ absorbed doses in CT examinations.
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