Radiology terminology

Question 1

Absorbed dose

Answer 1

the quantity of ionizing radiation absorbed by a body, measured (usually in grays) as the energy absorbed per unit mass

Question 2

Equivalent dose

Answer 2

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.

Question 3

Effective dose

Answer 3

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

Question 4

What does RPA advise on

Answer 4

IRR17

Question 5

What does MPE advise on

Answer 5

IRMER17

Question 6

Consult MPE about the

Answer 6

selection of suitable 3.7
dental X-ray equipment and ancillary equipment
– including dental CBCT or hand-held units

Question 7

Consult RPA about the

Answer 7

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.

Question 8

describe phenidone

Answer 8

first electron donor that reduces silver ions to metallic silver at latent image site

Question 9

describe hydroquinone

Answer 9

provides an electron to reduce oxidized phenidone to its original active state

Question 10

developer solution

Answer 10

converts the invisible image to a visible image

Question 11

what is the filament responsible for?r

Answer 11

releasing electrons

Question 12

what is the function of the anode in a x-ray tube?

Answer 12

convert electrons into photons

Question 13

what is the function of the cathode in a x-ray tube?

Answer 13

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.

Question 14

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.

Answer 14

• a decrease in object-film distance results in a decrease in magnification

Question 15

if the horizontal angulation is increased mesially or distally there will be?

Answer 15

overlapping of structures