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Initial investigation using statistical process control for quality control of accelerator beam steering.

Charles M Able¹, Carnell J Hampton, Alan H Baydush

¹Department of Radiation Oncology, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157, USA. cable@wakehealth.edu

Radiation Oncology (London, England)

|December 30, 2011

Summary

Statistical process control (SPC) effectively monitors linear accelerator beam steering, detecting issues before equipment failure. This improves radiotherapy efficiency and beam consistency by identifying deviations early.

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Area of Science:

Medical Physics
Radiation Oncology
Quality Control

Background:

Clinical operational efficiency and accelerator beam consistency are critical in radiotherapy.
Equipment failures can disrupt treatment delivery and impact patient care.
Proactive monitoring of linear accelerator (LINAC) parameters is essential for reliable operation.

Purpose of the Study:

To investigate the application of statistical process control (SPC) to LINAC beam steering parameters.
To determine the utility of SPC in detecting changes before equipment failure.
To enhance clinical operational efficiency and accelerator beam consistency.

Main Methods:

Retrospective analysis of steering coil currents (SCC) for transverse and radial planes.
Utilized average and range (Xbar-R) process control charts (PCC) for SCC data.
Calculated PCC limits using initial data and evaluated SCC from September 2009 to June 2010.

Main Results:

High-alarm limits (6 standard deviations) were established for PCC.
Transverse angle SCC for 6 MV and 15 MV LINACs triggered high-alarms 90 and 108 days before failure, respectively.
Low alarms for transverse position and radial angle SCC indicated negative trends 116-124 days prior to failure.

Conclusions:

Implementing SPC for LINAC beam steering monitoring can improve radiotherapy efficiency.
SPC methods can detect abnormal changes in beam steering parameters before equipment failure.
This proactive approach enhances accelerator beam consistency and reliability.