8. Glossary
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Barracuda & QABrowser Reference Manual
Leakage radiation
See radiation
Magnification imaging
An imaging procedure carried out with magnification usually produced by purposeful
introduction of distance between the subject and the image receptor.
Measured value
Estimate of the true value of a quantity, derived from the indicated value of a meter
after applying all relevant correction factors.
Medical diagnostic radiology
Medical diagnosis using ionizing radiation.
Modulation transfer function (MTF)
A mathematical entity that expresses the relative response of an imaging system or
system component to sinusoidal inputs as a function of varying spatial frequency,
which is often expressed in linepairs per millimetre (lp/mm), the correct unit is however
m
-1
(or often mm
-1
). The reference value most commonly used is that for zero
frequency. The MTF can be thought of as a measure of spatial resolution of the
detector system.
SI unit: m
-1
Monitor, personnel
See personnel monitor.
Occupancy factor (T)
The factor by which the workload should be multiplied to correct for the degree of
occupancy (by any one person) of the area in question while the source is in the "ON"
condition and emitting radiation. This multiplication is carried out for radiation
protection purposes to determine compliance with the dose equivalent limits.
Operator
Any individual who personally utilizes or manipulates a source of radiation.
Orthopantomography
Orthopantomography (also called OPG or Panorama) is a radiographic procedure that
produces a single image of facial structures including the upper and lower dentition
jaws and their supporting structures and bones. Mostly used in dental applications. An
OPG ("orthopantomogram") gives a panoramic view of the mouth, giving information
on the teeth and the bones of the upper and lower jaw.
Particle fluence
Number of particles incident on a sphere, divided by the cross-sectional area of the
sphere.
SI unit: m
-2
Personnel monitor
Also known as personal monitor. An appropriately sensitive device used to estimate
the absorbed dose received by an individual.
Peak tube voltage Ûo (kVp)
The peak value of the tube voltage (corresponding to the highest available radiation
energy).
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