Polymer gels for in-phantom dose imaging in radiotherapy

Area of Science:

• Medical Physics
• Radiation Dosimetry
• Polymer Science

Background:

• Polymer gel dosimeters offer potential for in-phantom 3D dose determination.
• Oxygen infiltration can inhibit polymerization, affecting accuracy.
• Previous methods showed reliability but required improvements.

Purpose of the Study:

• To develop a valid and advantageous method for in-phantom 3D dose determinations using normoxic polymer gel dosimeters.
• To improve the reliability of absorbed dose imaging in radiotherapy.
• To minimize oxygen's inhibitory effect on polymerization.

Main Methods:

• Development of normoxic polymer gel dosimeter layers.
• Focus on minimizing oxygen infiltration into the gel matrix.
• Selection of appropriate materials for dosimeter walls.

Main Results:

• Achieved good steadiness in dosimeter sensitivity over time.
• Demonstrated satisfactory results in absorbed dose imaging.
• Successfully performed depth-dose profiling with the improved technique.

Conclusions:

• The enhanced normoxic polymer gel dosimeter provides a reliable method for 3D dose determination.
• Minimizing oxygen infiltration is crucial for accurate polymerization and dose imaging.
• The improved technique is advantageous for radiotherapy applications.