Description

Energy absorbed per unit mass of any material (cGy or rad)
Ratio of the dose rate with a scattering medium (water or phantom) to the dose rate at the same point without a scattering medium (air)
The amount of radiation exposure produced by a treatment machine or source as specified at a reference field size and at a specified reference distance
Depth at which electronic equilibrium occurs for photon beams
Equivalent rectangular field dimensions of the open or treated area within the collimator field dimensions. AKA Blocked field size
Square field that has the same percentage depth dose and output of a rectangular field
Dimensions of a treatment field at the isocenter (length and width)
Point of intersection of the three aces of rotation of the treatment unit
Unit of output measure for linear accelerators
Ratio of the dose rate of a given field size to the dose rate of the reference field size. Allows for the change in scatter as the collimator setting changes.
Backscatter factor sometimes normalized to a reference field size, usually 10 x 10cm for energies of 4 MV and above
Ratio of the absorbed dose at a given depth to the absorbed dose at a fixed reference depth, usually Dmax
Legal document written by radiation oncologist that defines treatment volume, intended tumor dose, number of treatments, dose per treatment, and frequency of treatment
Distance from the source of radiation to the axis of rotation of the treatment unit
Distance from the source of radiation to the patient’s skin
Beam of radiation gives up energy as it travels through the body. The more tissue the beam traverses, the more it is attenuated (absorbed)
Ratio of the absorbed dose at a given depth in phantom to the absorbed dose at the same point in space
Ratio of the absorbed dose at a given depth in phantom to the absorbed dose at the same point at the level of Dmax in phantom
Ratio of the absorbed dose at a given depth in phantom to the absorbed dose at the same point at a reference depth in phantom
Visualization perspective that is “end-on” or positioned as if looking at a volume from the source of radiation
The culmination of the radiation treatment planning process that offers the best beam arrangements and beam energies to produce the planned and intended treatment
Corrections for beam incidence onto surfaces other than flat surfaces and for angles of incidence other than 90 degrees. (AKA obliquity corrections)
Grid of points at which dose is computed and subsequently displayed
Defined area of accumulated dose deposited in tissue that represents uniform, homogeneous dose distribution
Special representations of the magnitude of the dose produced by a source of radiation
Plot of target or normal structure volume as a function of dose
Use of a moving collimator jaw to produce a wedged Isodose distribution
Degree of evenness of dose across a beam profile
Process of entering dose altering parameters and beam modifiers into the treatment plan by the planner
Corrections that account for the presence of irradiated media other than water
Measure of the angle between central rays of two intersecting treatment beams
Treatment planning in which the clinical objectives are specified mathematically and computer software is used to determine the best beam parameters that will lead to the desired dose distribution
Combine both the depth dose and off-axis profile characteristics of the beam
Point inside the area to be treated that is chosen to receive 100% of the dose. (__________point)
Normal tissues (critical structures) in which sensitivity to radiation damage may influence treatment planning and/or the delivery of a prescribed dose of radiation
Process of identifying structures, target volumes or normal tissues, by creating contours around them
Two treatment fields share common central axes, 180 degrees apart
Describes radiation intensity as a function of position across the beam at a given depth
Assesses normal tissue responses to ionizing radiation based on modern dose distributions calculations, quantitative analyses of normal tissue effects in the clinic
Maximum point-to-point difference in the central 80% of the profile
The process by which dose delivery is optimized for a given patient and clinical situation
Variable thickness attenuator
The angle between the slanted Isodose line and a line perpendicular to the central axis of the beam

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