GXMO Vocabulary/Terminology Exam
2026 Questions and Answers
artifacts - Correct answer-an erroneous portion of an image or tracing that does not
accurately represent the subject of the image or measurement being recorded
atomic structure - Correct answer-represents the number of protons in the nucleus
of an atom
attenuation - Correct answer-absorption of the x-ray beam in matter, usually the
human body
automatic exposure control (AEC) - Correct answer-an electronic circuit within the
x-ray machine that automatically terminates the exposure time when a
predetermined quantity of x-rays has been detected.
basic biologic effects of radiation exposure - Correct answer-1. (acute) high dose
radiation over a short period of time 2. (chronic) low doses over a longer period of
time 3. DNA damage resulting in cell death; tissue death; 4. DNA damage resulting
in genetic mutation; 5. DNA damage resulting in formation of cancer cells
beam quality - Correct answer-manipulated by kVp
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, -refers to photon energy
-affects penetrating ability of beam
beam restrictors - Correct answer-function to limit the size of the irradiated field.
In doing so, they limit the volume of tissue irradiated (thereby decreasing the
percentage of scattered radiation generated in the part) and help reduce patient
dose.
beam restrictors contrast - Correct answer-An increase in beam restriction results
in less radiographic noise (fog) resulting in increased contrast resolution (contrast);
Increasing beam restriction refers to making the field size smaller - i.e. changing
from 14x17 to 10x12 collimation.
chemical safety - Correct answer-Film processing chemistry is toxic and hazardous
to bare skin; Safe handling requirements must be clearly marked on the label;
Developer is alkaline in nature; Fixer is acidic
contrast - Correct answer-the difference in density between any two adjacent
portions of the image
contrast resolution - Correct answer-the ability of an imaging system to distinguish
anatomical structures of similar subject contrast such as liver-spleen and gray
matter-white matter
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
2026 Questions and Answers
artifacts - Correct answer-an erroneous portion of an image or tracing that does not
accurately represent the subject of the image or measurement being recorded
atomic structure - Correct answer-represents the number of protons in the nucleus
of an atom
attenuation - Correct answer-absorption of the x-ray beam in matter, usually the
human body
automatic exposure control (AEC) - Correct answer-an electronic circuit within the
x-ray machine that automatically terminates the exposure time when a
predetermined quantity of x-rays has been detected.
basic biologic effects of radiation exposure - Correct answer-1. (acute) high dose
radiation over a short period of time 2. (chronic) low doses over a longer period of
time 3. DNA damage resulting in cell death; tissue death; 4. DNA damage resulting
in genetic mutation; 5. DNA damage resulting in formation of cancer cells
beam quality - Correct answer-manipulated by kVp
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, -refers to photon energy
-affects penetrating ability of beam
beam restrictors - Correct answer-function to limit the size of the irradiated field.
In doing so, they limit the volume of tissue irradiated (thereby decreasing the
percentage of scattered radiation generated in the part) and help reduce patient
dose.
beam restrictors contrast - Correct answer-An increase in beam restriction results
in less radiographic noise (fog) resulting in increased contrast resolution (contrast);
Increasing beam restriction refers to making the field size smaller - i.e. changing
from 14x17 to 10x12 collimation.
chemical safety - Correct answer-Film processing chemistry is toxic and hazardous
to bare skin; Safe handling requirements must be clearly marked on the label;
Developer is alkaline in nature; Fixer is acidic
contrast - Correct answer-the difference in density between any two adjacent
portions of the image
contrast resolution - Correct answer-the ability of an imaging system to distinguish
anatomical structures of similar subject contrast such as liver-spleen and gray
matter-white matter
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
