Multileaf collimator characteristics and reliability requirements for IMRT Elekta system

International Journal of Radiation Oncology, Biology, Physics
Chihray LiuJatinder Palta

Abstract

Understanding the characteristics of a multileaf collimator (MLC) system, modeling MLC in a treatment planning system, and maintaining the mechanical accuracy of the linear accelerator gantry head system are important factors in the safe implementation of an intensity-modulated radiotherapy program. We review the characteristics of an Elekta MLC system, discuss the necessary MLC modeling parameters for a treatment planning system, and provide a novel method to establish an MLC leaf position quality assurance program. To perform quality assurance on 40 pairs of individual MLC leaves is a time-consuming and difficult task. In this report, an effective routine MLC quality assurance method based on the field edge of a backup jaw as referenced in conjunction with a diode array as a radiation detector system is discussed. The sensitivity of this test for determining the relative leaf positions was observed to be better than 0.1 mm. The Elekta MLC leaf position accuracy measured with this system has been better than 0.3 mm.

References

Jul 1, 1996·Medical Physics·J R PaltaV Frouhar
Jul 18, 2002·Physics in Medicine and Biology·M Saiful HuqJames M Galvin
Oct 1, 2003·Physics in Medicine and Biology·Martin J ButsonTsang Cheung
Feb 1, 1994·Physics in Medicine and Biology·T J Jordan, P C Williams

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