SU-E-T-127: Feasibility Study for Using a 2D Array Detector for All Beam Measurements in Monthly Quality Assurance...

Area of Science:

• Medical Physics
• Radiation Oncology
• Quality Assurance

Background:

• Traditional quality assurance (QA) in radiation oncology often involves multiple detectors and setups, which can be time-consuming and complex.
• Optimizing QA processes is crucial for ensuring treatment accuracy and patient safety.

Purpose of the Study:

• To develop a more efficient monthly QA process by utilizing a single detector with multiple setups.
• To evaluate the Sun Nuclear IC Profiler's capability in a streamlined QA workflow.

Main Methods:

• The Sun Nuclear IC Profiler, equipped with 251 ionization chambers, was used to measure machine output, transverse profiles, and depth-dose profiles.
• A Lucite compensator with an angled surface was fabricated to measure depth-doses.
• Proton beam measurements were conducted to assess the detector's response to small range changes (1.0 mm solid water).

Main Results:

• The IC Profiler met vendor specifications for machine output and transverse profile measurements.
• It accurately measured depth-dose profiles, detecting a 17.0% change for a 1.0 mm range shift.
• The system demonstrated sensitivity to detect sub-millimeter range shifts (0.3 mm).

Conclusions:

• The Sun Nuclear IC Profiler accurately and precisely measures machine output, transverse profiles, and depth-dose profiles.
• Employing a single detector for all beam measurements significantly enhances QA efficiency by reducing detector overhead.
• This approach maintains, rather than sacrifices, the accuracy and precision of QA measurements.