An x-ray exposure at 50 inches (127 cm) results in a beam intensity of 200 microgray
(μGy). What is the new intensity for an x-ray exposure at 40 inches (102 cm)?
128 μGy
160 μGy
250 μGy
312 μGy
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312 μGy
200 x 50squared / 40squared = 312 μGy
,A radiology department's routine protocol is to complete knee exams with the use of
a grid. However, in a portable situation, the technologist does not have a grid and
decides to complete the exam without a grid and without making and changes to the
technique. Without the use of a grid, the quality of the image will demonstrate
decreased:
Receptor exposure
Noise
Contrast
Spatial resolution
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Contrast
In order to ensure optimal receptor exposure, the portion of the patient's anatomy
that should be positioned over the active automatic exposure control (AEC) chamber
is the:
Structure of primary concern
Structure of least concern
Highest density structure
Lowest density structure
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Structure of primary concern
The structure of primary concern should always be placed over the active
automatic exposure control (AEC) cell(s).
,Which of the following radiographic exam scenarios would utilize a moving grid?
Portable chest radiograph
Supine abdomen radiograph in the table bucky
Tabletop hand radiograph
Tabletop food radiograph
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Supine abdomen radiograph in the table bucky
Moving grids can only be used in conjunction with the x-ray table and wall
bucky system. Moving grids can't be used in portable imaging, stationary
grids are used in portable imaging.
Tabletop imaging of a hand would not require a grid since it is a smaller
extremity. Extremities such as a hand or foot are smaller in thickness, less
than 10 cm.
According to the inverse square law, if the source-to-image distance (SID) increases,
the receptor exposure will:
Increase
Decrease
Remain the same
Give this one a try later!
Decrease
A radiographer typically uses 80 kilovoltage peak (kVp) and 3 milliampere-seconds
(mAs) on a portable chest exam without a grid. If the radiographer uses and 8:1 grid
, on a portable chest, what new mAs would be required to compensate for the grid?
6 mAs
9 mAs
12 mAs
15 mAs
Formula: mAs1 / mAs2 = Grid Factor1 / Grid Factor2
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12 mAs
Compared to a stationary grid, the main advantage of using a moving grid is that the:
Grid lines will be more visible with a moving grid
Grid lines will be blurred and not visible with a moving grid
Moving grid is more efficient at absorbing scatter radiation
Moving grid will produce higher contrast images
Give this one a try later!
Grid lines will be blurred and not visible with a moving grid
An x-ray exposure at 40 inches (102 cm) results in a beam intensity of 200 microgray
(μGy). What is the new intensity for an x-ray exposure at 50 inches (127 cm)?
128 μGy
160 μGy
250 μGy
312 μGy
Give this one a try later!
(μGy). What is the new intensity for an x-ray exposure at 40 inches (102 cm)?
128 μGy
160 μGy
250 μGy
312 μGy
Give this one a try later!
312 μGy
200 x 50squared / 40squared = 312 μGy
,A radiology department's routine protocol is to complete knee exams with the use of
a grid. However, in a portable situation, the technologist does not have a grid and
decides to complete the exam without a grid and without making and changes to the
technique. Without the use of a grid, the quality of the image will demonstrate
decreased:
Receptor exposure
Noise
Contrast
Spatial resolution
Give this one a try later!
Contrast
In order to ensure optimal receptor exposure, the portion of the patient's anatomy
that should be positioned over the active automatic exposure control (AEC) chamber
is the:
Structure of primary concern
Structure of least concern
Highest density structure
Lowest density structure
Give this one a try later!
Structure of primary concern
The structure of primary concern should always be placed over the active
automatic exposure control (AEC) cell(s).
,Which of the following radiographic exam scenarios would utilize a moving grid?
Portable chest radiograph
Supine abdomen radiograph in the table bucky
Tabletop hand radiograph
Tabletop food radiograph
Give this one a try later!
Supine abdomen radiograph in the table bucky
Moving grids can only be used in conjunction with the x-ray table and wall
bucky system. Moving grids can't be used in portable imaging, stationary
grids are used in portable imaging.
Tabletop imaging of a hand would not require a grid since it is a smaller
extremity. Extremities such as a hand or foot are smaller in thickness, less
than 10 cm.
According to the inverse square law, if the source-to-image distance (SID) increases,
the receptor exposure will:
Increase
Decrease
Remain the same
Give this one a try later!
Decrease
A radiographer typically uses 80 kilovoltage peak (kVp) and 3 milliampere-seconds
(mAs) on a portable chest exam without a grid. If the radiographer uses and 8:1 grid
, on a portable chest, what new mAs would be required to compensate for the grid?
6 mAs
9 mAs
12 mAs
15 mAs
Formula: mAs1 / mAs2 = Grid Factor1 / Grid Factor2
Give this one a try later!
12 mAs
Compared to a stationary grid, the main advantage of using a moving grid is that the:
Grid lines will be more visible with a moving grid
Grid lines will be blurred and not visible with a moving grid
Moving grid is more efficient at absorbing scatter radiation
Moving grid will produce higher contrast images
Give this one a try later!
Grid lines will be blurred and not visible with a moving grid
An x-ray exposure at 40 inches (102 cm) results in a beam intensity of 200 microgray
(μGy). What is the new intensity for an x-ray exposure at 50 inches (127 cm)?
128 μGy
160 μGy
250 μGy
312 μGy
Give this one a try later!
