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A quality control test for electronic portal imaging devices

R Rajapakshe¹, K Luchka, S Shalev

¹Manitoba Cancer Treatment and Research Foundation, Winnipeg, Canada.

Medical Physics

|July 1, 1996

Summary

A new quality control (QC) test offers daily, objective assessment of electronic portal imaging devices. This test ensures acceptable image quality by measuring spatial resolution and contrast-to-noise ratio (CNR).

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Area of Science:

Medical Physics
Radiological Imaging Technology
Quality Assurance in Healthcare

Background:

Electronic portal imaging devices (EPIDs) are crucial for radiotherapy verification.
Routine quality control (QC) is essential for maintaining EPID performance and ensuring accurate treatment delivery.
Existing QC methods may lack objectivity or suitability for daily use.

Purpose of the Study:

To develop and validate a routine, daily quality control (QC) test for video-based electronic portal imaging devices (EPIDs).
To establish an objective and quantitative measure of image quality for EPIDs.
To ensure consistent and reliable performance of EPID systems.

Main Methods:

Development of a QC test utilizing a phantom with high-contrast bar patterns.

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Measurement of high-contrast spatial resolution and contrast-to-noise ratio (CNR).

Determination of critical values for spatial frequency (fc) and CNR (CNRc) during a calibration period.

Main Results:

The developed QC test provides objective, quantitative image quality assessment.
Established critical frequency (fc) and critical CNR (CNRc) values for system calibration.
Subsequent measurements successfully identified deviations, triggering operator warnings for potential system issues.

Conclusions:

The new QC test is suitable for routine daily use in assessing EPID image quality.
The test offers a sensitive and reliable method for detecting performance degradation in EPIDs.
Implementation of this QC test can enhance the safety and efficacy of radiotherapy.