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Thursday, 31 October 2024
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Searchterm 'Intensity' found in 2 terms [
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Voxel
A voxel is a volume element (volumetric pixel) representing a value in the three dimensional space (expressed in units of mm3), corresponding to a pixel for a given slice thickness. Voxels are frequently used in the visualization and analysis of medical data. The CT pixel intensity is proportional to the signal intensity of the appropriate voxel. Voxels are associated with CT numbers.
Attenuation
The attenuation of radiation is a decrease in intensity as a result of interactions by transmission through matter. X-ray beams attenuate due to photon absorption by the material or scattering. Both effects are energy dependent. The probability of absorption or scattering is a function of the photon energy. The photoelectric absorption is much more energy dependent than the Compton scatter effect.

See also Attenuation Correction, Linear Energy Transfer, Broad Beam and Ion Beam.
Bucky Factor
(B) The Bucky factor is the ratio of x-rays arriving at the grid (incident radiation), and those being transmitted through the grid. The Bucky factor describes how much the output of the x-ray tube must be increased in order to compensate for the removal of incident radiation by a grid.
B = incident radiation / transmitted radiation
For example, if for every two x-rays impinging the grid, only one will pass through, then the grid has a Bucky factor of two and the intensity of the x-ray beam must be doubled.
Calibration
A calibration is a correction procedure that determines the relationship between the measured output of a system and the reference standard. Calibration procedures include scanning air or an appropriate test phantom.
The calibration of a CT system takes account of variations in beam intensity or detector efficiency in order to achieve best homogeneity within the field of view and the accuracy of CT numbers.

See also Calibration Factor and Acceptance Checking.
Cryotherapy
Cryotherapy (also called cryoablation or cryosurgery) uses extreme cold for the treatment of disease. A cryoprobe applies the cold to the selected anatomic area, for example the prostate.

See also Brachytherapy, RF Thermal Ablation, High Intensity Focused Ultrasound and Prostate Ultrasound.
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 [last update: 2023-11-06 02:01:00]