A new three-dimensional dose distribution reduction scheme for tubular organs

Area of Science:

• Radiation Oncology
• Medical Physics
• Cancer Treatment Planning

Background:

• Spatial dose distribution is crucial for normal tissue response in tubular organs.
• Conventional dose-volume-histograms (DVHs) and dose-surface-histograms (DSHs) lack essential spatial information.
• Existing methods are inadequate for representing complex three-dimensional (3D) dose data in these structures.

Purpose of the Study:

• To introduce a novel 3D dose distribution data reduction scheme preserving longitudinal and circumferential characteristics.
• To develop a new tool for analyzing spatial dose distributions in tubular organs.
• To facilitate the study of normal tissue complication risks related to spatial dose patterns.

Main Methods:

• Generated dose distributions for esophagus and rectum in 123 lung and prostate cancer patients.
• Analyzed axial dose distribution histograms along the circumference to create dose-circumference-histogram (DCH) sheets.
• Developed two plot types from DCH sheets: percentage of circumference receiving dose, and minimum dose to a percentage of circumference.

Main Results:

• Successfully generated DCH sheets that retain longitudinal and circumferential dose information.
• Developed novel graphical representations of spatial dose distribution for tubular organs.
• Demonstrated the potential of DCHs as a treatment planning tool.

Conclusions:

• Dose-circumference-histograms (DCHs) offer a valuable method for representing 3D spatial dose data in tubular structures.
• DCHs can be integrated into 3D treatment planning systems.
• This approach is promising for investigating the relationship between spatial dose distribution and normal tissue complication risks.