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8. Glossary
Piranha & QABrowser Reference Manual
2014-06/5.5C
164
Leakage radiation
All radiation coming from within the source assembly except for the useful beam. (Note:
Leakage radiation includes the portion of the radiation coming directly from the source
and not absorbed by the source assembly, as well as the scattered radiation produced
within the source assembly).
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
Summary of Contents for Piranha
Page 1: ...Reference Manual English Version 5 5C Piranha QABrowser RTI article number 9629050 10 ...
Page 8: ...Introduction Chapter 1 ...
Page 12: ...Description of the Piranha Chapter 2 ...
Page 40: ...Description of the QABrowser Chapter 3 ...
Page 77: ...Measurement Principles Theory Chapter 4 ...
Page 91: ...Measurements with the Piranha System Chapter 5 ...
Page 151: ...Optional Accessories Chapter 6 ...
Page 155: ...Problems and Solutions Chapter 7 ...
Page 161: ...Glossary Chapter 8 ...
Page 181: ...Notes Piranha QABrowser Reference Manual 2014 06 5 5C Notes 177 ...