An improved technique for aligning the light field with the radiation fields on radiotherapy accelerators

Area of Science:

• Medical Physics
• Radiation Oncology

Background:

• Accurate alignment of light and radiation fields is crucial for effective radiotherapy.
• Existing methods for field coincidence measurement can introduce uncertainties.

Purpose of the Study:

• To develop an improved and accurate method for measuring the coincidence of light and radiation fields in radiotherapy accelerators.
• To provide a simpler technique that minimizes uncertainties compared to conventional methods.

Main Methods:

• Sequential scanning of light and radiation fields using a photodiode.
• Utilizing standard field plotting apparatus for data acquisition.
• Superimposing the scanned plots to determine field boundary differences.

Main Results:

• The developed scheme accurately measures the coincidence of light and radiation fields.
• Differences between the two fields' boundaries can be precisely determined.
• The technique is simple to implement and avoids film-related uncertainties.

Conclusions:

• The improved scheme offers a reliable and accurate method for radiotherapy field alignment verification.
• This technique enhances the precision of radiation delivery in cancer treatment.
• The photodiode-based method presents a practical alternative to film-based measurements.