A test object for evaluation of portal films

Area of Science:

• Medical Physics
• Radiotherapy Imaging

Background:

• Portal films are essential for verifying radiation therapy accuracy.
• Evaluating portal film image quality is critical for treatment efficacy.
• Current methods for assessing image quality can be complex.

Purpose of the Study:

• To design and evaluate a novel test object for assessing portal film image quality.
• To simulate clinical conditions for portal film evaluation.
• To simplify studies on portal film production and viewing techniques.

Main Methods:

• A test object comprising notched polyvinyl chloride cylinders on a plastic sheet was developed.
• The test object was immersed in water and exposed during portal film imaging.
• A panel of observers evaluated the image quality of the produced films.

Main Results:

• The test object successfully simulated the clinical application of portal films.
• Observer evaluation indicated the test object is a viable tool for image quality assessment.
• The pilot experiment demonstrated the test object's utility.

Conclusions:

• The developed test object is effective for evaluating portal film image quality in high-energy photon radiation therapy.
• This test object can streamline research into optimizing portal film production and viewing.
• The tool offers a simplified approach to quality assurance in radiotherapy imaging.