[Errors in the presentation of topometric data in radiotherapy planning systems]

Area of Science:

• Medical Physics
• Radiotherapy
• Computational Imaging

Background:

• Accurate calculation of effective radiological thickness is crucial for precise radiation therapy planning.
• Anatomical data representation, including organ contours and density variations, influences treatment accuracy.
• Understanding sources of error in dose calculation is essential for patient safety.

Purpose of the Study:

• To evaluate the accuracy of effective radiological thickness calculations using computer-aided simulation.
• To determine the impact of anatomical data detail and contour complexity on calculation errors.
• To quantify dose errors for a standard 60Co radiation therapy beam based on simulation results.

Main Methods:

• Computer-aided simulation was employed to model the radiotherapy system.
• Anatomical data were presented as organ contours with varying density areas.
• Calculated effective radiological thickness was compared with tomographic findings.
• Dose error was calculated for a typical 60Co radiation beam.

Main Results:

• Dependence of calculation error on the level of detail in anatomical data presentation was established.
• The influence of contour set complexity on calculation accuracy was investigated.
• Quantified dose errors were obtained for a standard 60Co therapy beam, linked to contour complexity.

Conclusions:

• The accuracy of effective radiological thickness calculation is sensitive to the detail and complexity of anatomical data representation.
• Increased anatomical detail and contour complexity can lead to significant dose errors in radiation therapy planning.
• These findings highlight the importance of accurate data input for reliable radiotherapy dose calculations.