CAMRT Section E: Operation of Radiographic
Equipment (6-10%) Exam | Questions with 100%
Correct Answers | Verified | Latest Update
2026/2027
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Terms in this set (45)
3 factors contribute to an increase in increased kV, increased x-ray field size, increased
scatter: patient thickness.
Grids are used when the body part is 10, 60
greater than ___ cm in thickness
and/or when using a kVp greater
than 60.
The grid ratio is a measure of the height of the lead strip to the
interspace distance and is a good measure of the
selectivity of primary to scatter transmission.
grid frequency is a measure of the number of grid lines per unit
distance (inches or centimeters) and is in the range
of 40 - 50 lines/cm
Grid Cutoff: Upside-Down Focused ◦ Occurs when a focused grid is placed upside down
on the IR, resulting in the grid lines going opposite
the angle of divergence of the x-ray beam. appears
as Exposure in the middle; lack of exposure on
both sides of the image.
, Grid Cutoff: Off Level. Occurs when the x-ray beam is angled across the
lead ◦ You will see grid cut-off through the whole
image ◦ This most commonly occurs with portable
imaging when the patient's body weight is not
evenly distributed on the grid/image receptor
Grid Cutoff: Off Center Occurs when the CR of the x-ray beam is not
aligned/centered along the long axis of a focused
grid. ◦ You will see grid cut-off throughout the
whole image and it will be underexposed.
Grid Cut-Off: Off Focus (incorrect SID) ◦ Occurs when the grid is used at a
distance other than the recommended range of
SIDs. ◦ You will see grid cut-off towards the edges
or on the periphery of the image. ◦ It is not as
pronounced as when a focused grid is used upside
down.
Moiré Effect Grid error that occurs with digital radiography. ◦
Occurs when the grid lines are captured and
scanned parallel to the scan lines in the imaging
plate readers. ◦ Artifact demonstrated when a
stationary grid is used during CR imaging and the
grid frequency is similar to the laser scanning
frequency.
Air Gap Technique A method of limiting scatter from reaching image
receptor ◦ Increased OID will result in some scatter
missing the image receptor, and contrast is
improved. ◦ An increase in OID will decrease spatial
resolution
Equipment (6-10%) Exam | Questions with 100%
Correct Answers | Verified | Latest Update
2026/2027
Save
Terms in this set (45)
3 factors contribute to an increase in increased kV, increased x-ray field size, increased
scatter: patient thickness.
Grids are used when the body part is 10, 60
greater than ___ cm in thickness
and/or when using a kVp greater
than 60.
The grid ratio is a measure of the height of the lead strip to the
interspace distance and is a good measure of the
selectivity of primary to scatter transmission.
grid frequency is a measure of the number of grid lines per unit
distance (inches or centimeters) and is in the range
of 40 - 50 lines/cm
Grid Cutoff: Upside-Down Focused ◦ Occurs when a focused grid is placed upside down
on the IR, resulting in the grid lines going opposite
the angle of divergence of the x-ray beam. appears
as Exposure in the middle; lack of exposure on
both sides of the image.
, Grid Cutoff: Off Level. Occurs when the x-ray beam is angled across the
lead ◦ You will see grid cut-off through the whole
image ◦ This most commonly occurs with portable
imaging when the patient's body weight is not
evenly distributed on the grid/image receptor
Grid Cutoff: Off Center Occurs when the CR of the x-ray beam is not
aligned/centered along the long axis of a focused
grid. ◦ You will see grid cut-off throughout the
whole image and it will be underexposed.
Grid Cut-Off: Off Focus (incorrect SID) ◦ Occurs when the grid is used at a
distance other than the recommended range of
SIDs. ◦ You will see grid cut-off towards the edges
or on the periphery of the image. ◦ It is not as
pronounced as when a focused grid is used upside
down.
Moiré Effect Grid error that occurs with digital radiography. ◦
Occurs when the grid lines are captured and
scanned parallel to the scan lines in the imaging
plate readers. ◦ Artifact demonstrated when a
stationary grid is used during CR imaging and the
grid frequency is similar to the laser scanning
frequency.
Air Gap Technique A method of limiting scatter from reaching image
receptor ◦ Increased OID will result in some scatter
missing the image receptor, and contrast is
improved. ◦ An increase in OID will decrease spatial
resolution
