Abstract

Today 52 % of patients with a cancer get radiation therapy. It is developed the experimental procedure for determining the backscatter factor for Siemens Oncor Impression Plus linear accelerator. The experiments were carried out based on water phantom. This technique can be also used for other kinds of accelerators.

Highlights

  • The appearance of a multi-leaf collimator (MLC) in a linear electron accelerator (LEA) made it indispensable in the radiotherapy

  • This process is occurring into the "main part" of LEA consisting of a tungsten target, shaping filter, compensating filter, monitor chamber (Mon 1), "curtains" collimator (Y-jaws), and collimator blades

  • The upper “curtain“ (Y-jaws) and lower lobe are placed at 22.47 cm and 30.27 cm from the monitor chamber, respectively. This LEA is used for three-dimensional conformal radiotherapy (3D CRT), intensity modulated radiotherapy (IMRT) and radiation electrons of surface cancer diseases

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Summary

Introduction

The appearance of a multi-leaf collimator (MLC) in a linear electron accelerator (LEA) made it indispensable in the radiotherapy. The primary advantage of the upper jaw replacement configuration is that the range of motion of the leaves required to traverse the collimated field width is smaller, allowing for a shorter leaf length and a more compact treatment head diameter. The GE MLC system is no longer being sold In both the Siemens design, the leaf ends are straight and are focused on the x-ray source. The Varian MLC is an example of a tertiary collimator system (Fig. 2).This device is positioned just below the level of the standard upper and lower adjustable jaws. When the MLC is fitted and a block support tray is added for additional field shaping, clearance to the isocenter is the same as the non-MLC treatment head. If a blocking tray holder is retained, patients whose treatment positions call for their elbows to extend laterally, such as in breast cancer, may not clear unless the blocking tray holder is removed

Measurement description and problem formulation
Materials and methods
Results of experimental study of backscattering
Conclusions
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