[New technology in radiotherapy treatment planning]

Area of Science:

• Radiation oncology
• Medical imaging
• Computational anatomy

Context:

• Four-dimensional radiation therapy (4DRT) and adaptive radiation therapy (ART) address respiratory motion and anatomical variations during cancer treatment.
• Accurate dose calculation requires accumulating dose distributions from multiple image sets, such as 4D CT and CBCT.
• Traditional pixel-wise dose accumulation fails when image sets differ due to anatomical changes or different imaging modalities.

Purpose:

• To introduce dose accumulation based on deformable image registration (DIR).
• To explain the application of DIR-based dose accumulation in 4DRT and ART.
• To highlight the importance of DIR for evaluating cumulative dose distributions in complex radiation therapy.

Summary:

• Deformable image registration (DIR) identifies corresponding anatomical points across different image sets.
• Dose accumulation using DIR overcomes limitations of pixel-wise methods by accounting for anatomical differences.
• This approach enables precise evaluation of overall dose distributions in 4DRT and ART, crucial for treatment efficacy.

Impact:

• DIR-based dose accumulation is a promising technology for improving the accuracy of radiation therapy planning and delivery.
• Enables better assessment of treatment effectiveness and potential toxicity in patients undergoing 4DRT and ART.
• Facilitates more personalized and precise cancer treatments by accurately reflecting anatomical and physiological changes.