FLUOROSCOPY EXAM QUESTIONS
WITH CORRECT ANSWERS
At what height above the tabletop should an unexposed border on the fluoroscopic
screen be visible when automatic collimating devices are used?
1 inch
6 inches
14 inches
All heights - ANSWER-All heights
Explanation:
An unexposed border must be visible when the screen carriage is positioned 14
inches above the tabletop and collimators are fully opened and at all heights when
automatic collimating devices are used.
Fluoroscopy technologists can do which of the following: select all that apply.
a) Use fluoroscopic equipment without an order.
b) Report a diagnosis to a patient if ordered by doctor.
c) Make a diagnosis based on a fluoroscopic image.
d) Position patients correctly during fluoroscopy. - ANSWER-A. Position patients
correctly during fluoroscopy, and. D. Report a diagnosis to a patient if ordered by a
doctor.
Explanation:
Fluoroscopy technologists are only allowed to perform fluoroscopy with a specific
order from a physician.
And, report a diagnosis if ordered by a physician.
Too much lighting during a fluoroscopy exam:
a) Helps to see images better
b) Improves visualization of television images
c) May increase fluoroscopy time
d) Helps with the luminescence of the image - ANSWER-c) May increase
fluoroscopy time
,Explanation:
It is important to adjust the lights in the room when performing fluoroscopy. Excess
lighting decreases the eyes ability to resolve images and will lead to increased
radiation exposure.
Humans can detect ionizing radiation as it passes through their body.
a) TRUE
b) FALSE - ANSWER-b) FALSE
Explanation:
Humans cannot detect ionizing radiation as it passes through their body.
What is the threshold dose?
a) The actual radiation dose a patient receives
b) The maximum radiation dose allowed
c) The radiation dose below which there is no effect
d) The radiation dose above which there is no effect. - ANSWER-c) The radiation
dose below which there is no effect
Explanation:
A threshold dose is one in which a minimum amount of radiation (threshold) is
required before it causes any deleterious effects.
When are thyroid shields used by operators?
At the discretion of the operator
Thyroid shields always need to be used
During all fluoroscopic procedures
During all radiographic procedures
When the operator is close to the patient during fluoroscopy - ANSWER-When the
operator is close to the patient during fluoroscopy
Explanation:
Thyroid shields are generally used when the wearer is in close proximity to the
patient during fluoroscopy, however, are not required for all fluoroscopic exams.
The following are nonstochastic effects:
select all that apply
,a) Bone marrow cell depletion
b) Somatic effects
c) Non-malignant skin damage
d) Cataracts
e) Carcinogenesis - ANSWER-a) Bone marrow cell depletion
c) Non-malignant skin damage
d) Cataracts
Explanation:
Nonstochastic effects are those for which the severity varies with radiation dose.
Examples of nonstochastic effects include cataracts, non-malignant skin damage,
and bone marrow depletion. Somatic effects and carcinogenesis are examples of
stochastic effects.
What image characteristic does a line pair grid measure?
a) Vignetting
b) Distortion
c) Contrast
d) Resolution - ANSWER-d) Resolution
Explanation:
A line pair grid is used to measure the image resolution. Resolution is given as "line
pairs per millimeter" and refers to the ability of an imaging system to differentiate
small objects as separate images positioned close together.
What is the approximate dose to the fetus from an upper-GI examination of a
pregnant patient with a total skin exposure of 5 Roentgens?
a) 1 millirad
b) 100 millirads
c) 1 rad
d) 50 rads - ANSWER-b) 100 millirads
Explanation:
1 Roentgen = 1 Rad. 1 Rad = 1,000 millirads. 5 Roentgens of skin exposure is equal
to 5,000 millirads. The dose to the fetus is approximately 2% of the skin dose. 2% of
5,000 = 0.02 * 5,000 = 100.
, What is the limit for leakage radiation from a fluoroscopic x-ray tube housing?
a) 50 mR at 1 meter
b) 100 mR at 1 meter
c) 1,000 mR at 1 meter
d) 2.2 rad at 1 meter - ANSWER-b) 100 mR at 1 meter
Explanation:
Leakage radiation from an x-ray tube housing may not exceed 100 mr at 1 meter.
The sterility resulting from a 50 rad exposure to gonads may be expected to be:
a) Temporary
b) Permanent
c) Unknown
d) No effect - ANSWER-Temporary
Explanation:
Acute doses on the order of 30 rads or more to the gonads may produce temporary
sterility. These doses are not encountered in routine diagnostic radiographic
examination.
Which of the following is(are) used to adjust contrast resolution?
(select all that apply)
a) Window level
b) Matrix size
c) Window width (chosen)
d) Pixel size - ANSWER-a) Window level
c) Window width
Explanation:
Contrast resolution is effected by the number of gray levels a pixel has, also known
as bit depth. The higher the bit depth the higher the contrast resolution. The contrast
resolution is adjusted using the window level and window width, known as gray-scale
processing.
WITH CORRECT ANSWERS
At what height above the tabletop should an unexposed border on the fluoroscopic
screen be visible when automatic collimating devices are used?
1 inch
6 inches
14 inches
All heights - ANSWER-All heights
Explanation:
An unexposed border must be visible when the screen carriage is positioned 14
inches above the tabletop and collimators are fully opened and at all heights when
automatic collimating devices are used.
Fluoroscopy technologists can do which of the following: select all that apply.
a) Use fluoroscopic equipment without an order.
b) Report a diagnosis to a patient if ordered by doctor.
c) Make a diagnosis based on a fluoroscopic image.
d) Position patients correctly during fluoroscopy. - ANSWER-A. Position patients
correctly during fluoroscopy, and. D. Report a diagnosis to a patient if ordered by a
doctor.
Explanation:
Fluoroscopy technologists are only allowed to perform fluoroscopy with a specific
order from a physician.
And, report a diagnosis if ordered by a physician.
Too much lighting during a fluoroscopy exam:
a) Helps to see images better
b) Improves visualization of television images
c) May increase fluoroscopy time
d) Helps with the luminescence of the image - ANSWER-c) May increase
fluoroscopy time
,Explanation:
It is important to adjust the lights in the room when performing fluoroscopy. Excess
lighting decreases the eyes ability to resolve images and will lead to increased
radiation exposure.
Humans can detect ionizing radiation as it passes through their body.
a) TRUE
b) FALSE - ANSWER-b) FALSE
Explanation:
Humans cannot detect ionizing radiation as it passes through their body.
What is the threshold dose?
a) The actual radiation dose a patient receives
b) The maximum radiation dose allowed
c) The radiation dose below which there is no effect
d) The radiation dose above which there is no effect. - ANSWER-c) The radiation
dose below which there is no effect
Explanation:
A threshold dose is one in which a minimum amount of radiation (threshold) is
required before it causes any deleterious effects.
When are thyroid shields used by operators?
At the discretion of the operator
Thyroid shields always need to be used
During all fluoroscopic procedures
During all radiographic procedures
When the operator is close to the patient during fluoroscopy - ANSWER-When the
operator is close to the patient during fluoroscopy
Explanation:
Thyroid shields are generally used when the wearer is in close proximity to the
patient during fluoroscopy, however, are not required for all fluoroscopic exams.
The following are nonstochastic effects:
select all that apply
,a) Bone marrow cell depletion
b) Somatic effects
c) Non-malignant skin damage
d) Cataracts
e) Carcinogenesis - ANSWER-a) Bone marrow cell depletion
c) Non-malignant skin damage
d) Cataracts
Explanation:
Nonstochastic effects are those for which the severity varies with radiation dose.
Examples of nonstochastic effects include cataracts, non-malignant skin damage,
and bone marrow depletion. Somatic effects and carcinogenesis are examples of
stochastic effects.
What image characteristic does a line pair grid measure?
a) Vignetting
b) Distortion
c) Contrast
d) Resolution - ANSWER-d) Resolution
Explanation:
A line pair grid is used to measure the image resolution. Resolution is given as "line
pairs per millimeter" and refers to the ability of an imaging system to differentiate
small objects as separate images positioned close together.
What is the approximate dose to the fetus from an upper-GI examination of a
pregnant patient with a total skin exposure of 5 Roentgens?
a) 1 millirad
b) 100 millirads
c) 1 rad
d) 50 rads - ANSWER-b) 100 millirads
Explanation:
1 Roentgen = 1 Rad. 1 Rad = 1,000 millirads. 5 Roentgens of skin exposure is equal
to 5,000 millirads. The dose to the fetus is approximately 2% of the skin dose. 2% of
5,000 = 0.02 * 5,000 = 100.
, What is the limit for leakage radiation from a fluoroscopic x-ray tube housing?
a) 50 mR at 1 meter
b) 100 mR at 1 meter
c) 1,000 mR at 1 meter
d) 2.2 rad at 1 meter - ANSWER-b) 100 mR at 1 meter
Explanation:
Leakage radiation from an x-ray tube housing may not exceed 100 mr at 1 meter.
The sterility resulting from a 50 rad exposure to gonads may be expected to be:
a) Temporary
b) Permanent
c) Unknown
d) No effect - ANSWER-Temporary
Explanation:
Acute doses on the order of 30 rads or more to the gonads may produce temporary
sterility. These doses are not encountered in routine diagnostic radiographic
examination.
Which of the following is(are) used to adjust contrast resolution?
(select all that apply)
a) Window level
b) Matrix size
c) Window width (chosen)
d) Pixel size - ANSWER-a) Window level
c) Window width
Explanation:
Contrast resolution is effected by the number of gray levels a pixel has, also known
as bit depth. The higher the bit depth the higher the contrast resolution. The contrast
resolution is adjusted using the window level and window width, known as gray-scale
processing.
