What is scatter factor?
Scatter Factor (SF) is a fibroblast-secreted protein which promotes motility and matrix invasion of epithelial cells. Hepatocyte Growth Factor (HGF) is a powerful mitogen for hepatocytes and other epithelial tissues.
What is output factor in radiotherapy?
As stated previously, in radiation therapy, the output. factor is defined as the ratio of measured dose between a. certain field and a reference field in a slab phantom per- pendicular to the beam axis.
What is wedge in radiotherapy?
In radiation therapy, wedge filters are commonly used to improve dose uniformity toward the target volume [2]. A physical wedge is usually constructed from a high-density material, such as lead or steel, which attenuates the beam progressively across the entire field.
How many leaves are in the MLC?
The MLCi MLC consists of two banks of 40 leaves, and the leaf width is 1.0 cm at the isocenter plane.
What is BSF in radiotherapy?
The concept backscatter factor, BSF. The backscatter factor can be defined as the quotient between the absorbed. dose in the surface layer of a phantom to the absorbed dose in the same.
How is wedge angle calculated?
When light passes through an optical wedge, the beam is deflected by some angle, δ, which is defined by the refractive index of the glass, n, and the glass’s mechanical wedge angle, α. The calculation for this is given by the formula: δ = 2(n-1) · α.
What are MLC made of?
A multileaf collimator (MLC) is a Collimator or beam-limiting device that is made of individual “leaves” of a high atomic numbered material, usually tungsten, that can move independently in and out of the path of a radiotherapy beam in order to shape it and vary its intensity.
What is the purpose of multileaf collimator?
Multileaf collimator is becoming the main tool for beam shaping on the linear accelerator. It is a simple and useful system in the preparation and performance of radiotherapy treatment.