Introduction to Fluoroscopy Exam Questions With
Complete Solutions
Besides bring the image to a monitor, what is another thing that
happens with CCD Correct Answers In addition to the monitors
the CCD is connected to an analog to digital converter (ADC)
which connects to a computer for image storage and distribution
(PACS).
Briefly explain the path of an x-ray through the II. Correct
Answers 1. X-rays absorbed by input fluorescent screen
2. Light produced
3. Light photons strike photocathode which emits photoelectrons
4. Electrons attracted to anode at other end of II
5. Electrons are focused onto output screen by electrostatic
lenses
6. Electrons strike output screen where light emitted
7. Visual light image
(Picked up by CCDs, Digital signal now sent to digital image
processor memory in computer, The electrical charge values,
once digitized, correspond to pixel brightness values on the
resultant image)
Describe continuous fluoroscopy Correct Answers - Continuous
beam gives decreased QM, increased image quality
- Uses lower mA, but continuous
- Gives higher radiation dose to patient
- Used for an arteriogram where a higher frame rate and
resolution is needed
, Describe distortion with FDP Correct Answers - They are not
affected by distortion
- Vignetting, pincushioning, blooming,or peripheral falloff are
not present as they are with I.I.'s.
Describe image acquisition in fluoroscopy Correct Answers
Once the light is emitted from the output screen of the image
intensifier, it must be transmitted and converted to the TV
monitor for viewing. The first step in the process requires the
use of fiberoptics. This is a bundle of a few millimeters thick
that contains thousands of glass fibers per square millimeters or
cross section. The bundle connects the output screen of the I.I. to
the Charged Coupled Device (CCD).
Describe Pulsed Fluoroscopy Correct Answers - Pulsed beam
gives increased QM, decreased image quality
- Gives lower radiation dose to patient
- Uses a higher mA per pulse to try and decrease quantum mottle
- Used for the passage of guidewires, catheters, and sheaths
where the poorer resolution is sufficient to show positioning of
the devices
Describe the angiography equipment Correct Answers 1. Use
large diameter, thick anodes because the X-ray tube must
tolerate high heat loads (1 MHU)
2. High power rating for rapid sequence serial radiography
3. C-arms are floor/ceiling mounted, table floats where needed
4. A small 0.3 mm focal spot must be available for detailed
imaging of small vessels.
Complete Solutions
Besides bring the image to a monitor, what is another thing that
happens with CCD Correct Answers In addition to the monitors
the CCD is connected to an analog to digital converter (ADC)
which connects to a computer for image storage and distribution
(PACS).
Briefly explain the path of an x-ray through the II. Correct
Answers 1. X-rays absorbed by input fluorescent screen
2. Light produced
3. Light photons strike photocathode which emits photoelectrons
4. Electrons attracted to anode at other end of II
5. Electrons are focused onto output screen by electrostatic
lenses
6. Electrons strike output screen where light emitted
7. Visual light image
(Picked up by CCDs, Digital signal now sent to digital image
processor memory in computer, The electrical charge values,
once digitized, correspond to pixel brightness values on the
resultant image)
Describe continuous fluoroscopy Correct Answers - Continuous
beam gives decreased QM, increased image quality
- Uses lower mA, but continuous
- Gives higher radiation dose to patient
- Used for an arteriogram where a higher frame rate and
resolution is needed
, Describe distortion with FDP Correct Answers - They are not
affected by distortion
- Vignetting, pincushioning, blooming,or peripheral falloff are
not present as they are with I.I.'s.
Describe image acquisition in fluoroscopy Correct Answers
Once the light is emitted from the output screen of the image
intensifier, it must be transmitted and converted to the TV
monitor for viewing. The first step in the process requires the
use of fiberoptics. This is a bundle of a few millimeters thick
that contains thousands of glass fibers per square millimeters or
cross section. The bundle connects the output screen of the I.I. to
the Charged Coupled Device (CCD).
Describe Pulsed Fluoroscopy Correct Answers - Pulsed beam
gives increased QM, decreased image quality
- Gives lower radiation dose to patient
- Uses a higher mA per pulse to try and decrease quantum mottle
- Used for the passage of guidewires, catheters, and sheaths
where the poorer resolution is sufficient to show positioning of
the devices
Describe the angiography equipment Correct Answers 1. Use
large diameter, thick anodes because the X-ray tube must
tolerate high heat loads (1 MHU)
2. High power rating for rapid sequence serial radiography
3. C-arms are floor/ceiling mounted, table floats where needed
4. A small 0.3 mm focal spot must be available for detailed
imaging of small vessels.
