Radiology terminology Flashcards

1
Q

Absorbed dose

A

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

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2
Q

Equivalent dose

A

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.

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3
Q

Effective dose

A

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

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4
Q

What does RPA advise on

A

IRR17

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5
Q

What does MPE advise on

A

IRMER17

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6
Q

Consult MPE about the

A

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

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7
Q

Consult RPA about the

A

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.

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8
Q

describe phenidone

A

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

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9
Q

describe hydroquinone

A

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

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10
Q

developer solution

A

converts the invisible image to a visible image

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11
Q

what is the filament responsible for?r

A

releasing electrons

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12
Q

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

A

convert electrons into photons

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13
Q

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

A

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.

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14
Q

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
  • a decrease in object-film distance results in a decrease in magnification
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15
Q

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

A

overlapping of structures

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16
Q
A