Fluoroscopy - Correct Answer uses a continuous beam of x-rays to create images of the movement of
internal structures that can be viewed on a monitor.
True or False?
Releasing the pressure applied to the deadman switch will terminate the radiation exposure during
fluoroscopy. - Correct Answer True
Fluoroscopy - Correct Answer allows imaging of anatomy in motion, or dynamic imaging.
Image intensification - Correct Answer is the process that the exits radiation from the anatomic area of
interest interacts with the input phosphor for conversion to visible light, which are converted to
electrons by a photocathode, then focused by electrostatic focusing lenses, and accelerated toward an
anode to strike the output phosphor.
True or False?
X-rays exiting the patient interact with the image intensifier to produce light photons which are then
converted to electrons and finally back to light energy. - Correct Answer True
Output phosphor - Correct Answer is coated with light-emitting crystals to absorb electrons and emit
light.
Input phosphor - Correct Answer absorbs x-rays and emits light.
Photocathode - Correct Answer absorbs light and converts light to electrons.
True or False?
The input phosphor is considerably larger than the output phosphor. - Correct Answer True
True or False?
, The image at the output phosphor is brighter in part because it is significantly smaller than the same
image at the input phosphor. - Correct Answer True
Conversion factor - Correct Answer another descriptor of the overall ability of an image intensifier to
create a brighter image, is measured in cd/m2/mR/s.
Brightness gain - Correct Answer minification gain x flux gain.
Conversion factor - Correct Answer is a newer term for brightness gain and is typically about 1% of the
brightness gain value.
ABC (Automatic Brightness Control) - Correct Answer maintains the brightness and contrast of the
fluoroscopic image during the procedure.
Magnification of the fluoroscopic image - Correct Answer occurs when the electrostatic lenses have
more voltage applied, creating a more negative charge.
magnification factor during fluoroscopic - Correct Answer equal to the full size input phosphor divided
by the selected input phosphor.
Using the magnification mode - Correct Answer improves spatial resolution of the fluoroscopic image.
True or False?
Additional x-ray photons must leave the patient and be absorbed by the image intensifier when
magnification mode is used. resulting in increased patient dose.*** - Correct Answer True
What is the typical spatial resolution range capabilities in fluoroscopic systems? - Correct Answer 4 to 6
Lp/mm
Shape distortion during fluoroscopy - Correct Answer is the result of the curved shape of the input
phosphor and photocathode.
internal structures that can be viewed on a monitor.
True or False?
Releasing the pressure applied to the deadman switch will terminate the radiation exposure during
fluoroscopy. - Correct Answer True
Fluoroscopy - Correct Answer allows imaging of anatomy in motion, or dynamic imaging.
Image intensification - Correct Answer is the process that the exits radiation from the anatomic area of
interest interacts with the input phosphor for conversion to visible light, which are converted to
electrons by a photocathode, then focused by electrostatic focusing lenses, and accelerated toward an
anode to strike the output phosphor.
True or False?
X-rays exiting the patient interact with the image intensifier to produce light photons which are then
converted to electrons and finally back to light energy. - Correct Answer True
Output phosphor - Correct Answer is coated with light-emitting crystals to absorb electrons and emit
light.
Input phosphor - Correct Answer absorbs x-rays and emits light.
Photocathode - Correct Answer absorbs light and converts light to electrons.
True or False?
The input phosphor is considerably larger than the output phosphor. - Correct Answer True
True or False?
, The image at the output phosphor is brighter in part because it is significantly smaller than the same
image at the input phosphor. - Correct Answer True
Conversion factor - Correct Answer another descriptor of the overall ability of an image intensifier to
create a brighter image, is measured in cd/m2/mR/s.
Brightness gain - Correct Answer minification gain x flux gain.
Conversion factor - Correct Answer is a newer term for brightness gain and is typically about 1% of the
brightness gain value.
ABC (Automatic Brightness Control) - Correct Answer maintains the brightness and contrast of the
fluoroscopic image during the procedure.
Magnification of the fluoroscopic image - Correct Answer occurs when the electrostatic lenses have
more voltage applied, creating a more negative charge.
magnification factor during fluoroscopic - Correct Answer equal to the full size input phosphor divided
by the selected input phosphor.
Using the magnification mode - Correct Answer improves spatial resolution of the fluoroscopic image.
True or False?
Additional x-ray photons must leave the patient and be absorbed by the image intensifier when
magnification mode is used. resulting in increased patient dose.*** - Correct Answer True
What is the typical spatial resolution range capabilities in fluoroscopic systems? - Correct Answer 4 to 6
Lp/mm
Shape distortion during fluoroscopy - Correct Answer is the result of the curved shape of the input
phosphor and photocathode.
