Radiology terminology Flashcards
Absorbed dose
the quantity of ionizing radiation absorbed by a body, measured (usually in grays) as the energy absorbed per unit mass
Equivalent dose
is a measure of the radiation dose to tissue where an attempt has been made to allow for the different relative biological effects of different types of ionising radiation.
Effective dose
is used to compare the stochastic risk of non-uniform exposure to radiation. Body tissues react differently to radiation and cancer induction occurs at a different rate of dose in different tissues. Hence, the effective dose is the risk of developing fatal cancer in the tissue in question
What does RPA advise on
IRR17
What does MPE advise on
IRMER17
Consult MPE about the
selection of suitable 3.7
dental X-ray equipment and ancillary equipment
– including dental CBCT or hand-held units
Consult RPA about the
layout and construction of 2.4, 2.5, 2.6
the dental radiography facilities, including required
structural protection and safety and warning
devices. Forward RPA’s report to the builder
and/or installer.
describe phenidone
first electron donor that reduces silver ions to metallic silver at latent image site
describe hydroquinone
provides an electron to reduce oxidized phenidone to its original active state
developer solution
converts the invisible image to a visible image
what is the filament responsible for?r
releasing electrons
what is the function of the anode in a x-ray tube?
convert electrons into photons
what is the function of the cathode in a x-ray tube?
The cathode is part of an x-ray tube and serves to expel the electrons from the circuit and focus them in a beam on the focal spot of the anode.
Comparison of magnification when the object to film distance changes. A short distance (A) shows less magnification than a long distance (B). Increasing source-to-object distance only will decrease the magnification of the radiographic image.
- a decrease in object-film distance results in a decrease in magnification
if the horizontal angulation is increased mesially or distally there will be?
overlapping of structures