FLUOROSCOPY FINAL TEST 2026
QUESTIONS WITH CORRECT
ANSWERS GRADED A+
◍ In fluoroscopy, the function of the image intensifier is to:1. Enhance the
color of the image.2. Reduce patient dose3. Magnify the image size4.
Brighten the fluoroscopic image.
Answer: 4. Brighten the fluoroscopic image
◍ Which two of the following are components of the image intensifier?1.
Input phosphor2. Photodiode3. Thin film transistor (TFT)4. Photocathode.
Answer: 1 & 4 - Input phosphor and photocathode
◍ What is fluoroscopy?.
Answer: A medical imaging technique that uses continuous or pulsed X-rays
to create real-time moving images of internal structures.
◍ What is the role of the anti- scatter grid in the image intensifier?1. Increase
image contrast2. Increase spatial resolution3. Decrease image contrast4.
Convert x-rays into light photons.
Answer: 1. Increase image contrast
◍ How does fluoroscopy differ from conventional radiography?.
Answer: Fluoroscopy allows clinicians to observe motion and guide
diagnostic and interventional procedures in real time, unlike static images
from conventional radiography.
◍ What is the purpose of electrostatic focusing lenses within an image
intensifier?1. Reduce scatter radiation2. Funnel the photoelectrons into a
concentrated stream3. Convert photoelectrons back to light photons4. Emit
photoelectrons through photoemission.
Answer: 2. Funnel the photoelectrons into a concentrated stream
,◍ When was fluoroscopy developed?.
Answer: In the late 19th century shortly after the discovery of X-rays.
◍ What is the final image intensifier energy conversion that occurs before the
visualization of the image on a monitor?1. X-rays to light photons2.
Photoelectrons to light photons3. Light photons to an analog signal4.
Analog signal to a digital signal.
Answer: 4. Analog signal to a digital signal
◍ What are the basic principles of fluoroscopy?.
Answer: Fluoroscopy works by producing X-rays that pass through the
patient, with different tissues absorbing X-rays differently, allowing the
remaining X-rays to be detected and converted into visible images.
◍ Which of the following components collects light photons from the output
phosphor and converts them to electrons?1. Vidicon television pick- up
tube2. Charge coupled device (CCD)3. Analog to digital converter (ADC)4.
Input phosphor.
Answer: 2. Charge coupled device (CCD)
◍ What are the main components of a fluoroscopy system?.
Answer: X-ray tube, collimator, patient table or C-arm, image receptor,
image processing unit, display monitor, and control console.
◍ Which of the following is the first order of events when operating an image
intensifier?1. Light photons strike the input phosphor2. X-rays strike the
output phosphor3. X-rays strike the input phosphor4. Electrons strike the
input phosphor.
Answer: 3. X-rays strike the input phosphor
◍ What is the voltage difference between the photocathode and anode
assembly in an image intensifier?1. 20-220V2. 15,000- 18,000V3. 25,000-
30,000V4. 35,000- 45,000V.
Answer: 3. 25,000- 30,000V
◍ Using a grid in fluoroscopy will increase which two of the following?1.
, Object to image distance2. Image quality3. Source to image distance (SID)4.
Patient dose.
Answer: 2 & 4 - Image quality and patient dose
◍ What is the role of the X-ray tube in fluoroscopy?.
Answer: It generates X-rays needed for imaging.
◍ When using an image intensifier in fluoroscopic imaging, where is the grid
located?1. On the output phosphor2. On the x-ray tube3. Behind the input
phosphor4. In front of the input phosphor.
Answer: 4. In front of the input phosphor
◍ What does the collimator do in a fluoroscopy system?.
Answer: It limits the size of the X-ray beam.
◍ Which of the following is accurate regarding grids used in fluoroscopic
imaging?1. Fluoroscopic imaging grids have a lower grid ratio than
radiographic imaging grids2. Fluoroscopic imaging grids have a higher grid
ratio than radiographic grids3. Fluoroscopic grids contain a crossed pattern4.
Fluoroscopic grids tend to have a Moire affect..
Answer: 1. Fluoroscopic imaging grids have a lower grid ratio than
radiographic imaging grids
◍ What is the function of the image receptor in fluoroscopy?.
Answer: It captures the X-rays as they pass through the patient, converting
them into visible images.
◍ What type of grid orientation is often found in conventional fluoroscopic
grids?1. Crossed2. Linear3. S- Shaped pattern4. Moire pattern.
Answer: 2. Linear
◍ What are the two types of flat-panel detectors (FPDs) used in fluoroscopy?.
Answer: Indirect conversion FPDs and direct conversion FPDs.
◍ What is an advantage of modern flat-panel detectors over image
intensifiers?.
Answer: FPDs provide better image quality, lower radiation dose, and more
, compact, distortion-free imaging.
◍ In order to decrease patient dose while performing a fluoroscopic procedure
on a pediatric patient, the operator should:1. increase the grid ratio2. Use a
crossed grid instead of a linear grid3. Increase the milliamperage (mA)
station4. Remove the grid.
Answer: 4. Remove the grid
◍ What is the purpose of contrast media in fluoroscopy?.
Answer: Contrast agents enhance visualization of internal structures, such as
barium sulfate for the GI tract and iodinated contrast for vascular and
urinary systems.
◍ List some common clinical applications of fluoroscopy..
Answer: Barium swallow and GI studies, upper and lower GI series, voiding
cystourethrogram (VCUG), cardiac catheterization, angiography, orthopedic
fracture reduction, pain management injections, urology and gynecology
procedures.
◍ When performing a fluoroscopic procedure on an adult patient, the operator
notes decreased image contrast due to high scatter production. Which of the
following steps would improve the image contrast?1. Add on a grid2.
Remove the grid3. Increase the mA4. Increase the kVp.
Answer: 1. Add on a grid
◍ What are some limitations of the old image intensifier systems?.
Answer: Geometric distortion, pincushion distortion, vignetting, limited
dynamic range, and aging of phosphors and photocathodes.
◍ Crossed grids in fluoroscopic imaging are which two of the following?1.
Often used in conventional fluoroscopy2. Often used in interventional
fluoroscopy3. Two sets of led strips orientated 90 degrees from one
another4. One set of lead strips in a linear orientation.
Answer: 2 & 3 - Often used in interventional fluoroscopy and two sets of led
strips orientated 90 degrees from one another
◍ What is the main advantage of direct conversion FPDs?.
QUESTIONS WITH CORRECT
ANSWERS GRADED A+
◍ In fluoroscopy, the function of the image intensifier is to:1. Enhance the
color of the image.2. Reduce patient dose3. Magnify the image size4.
Brighten the fluoroscopic image.
Answer: 4. Brighten the fluoroscopic image
◍ Which two of the following are components of the image intensifier?1.
Input phosphor2. Photodiode3. Thin film transistor (TFT)4. Photocathode.
Answer: 1 & 4 - Input phosphor and photocathode
◍ What is fluoroscopy?.
Answer: A medical imaging technique that uses continuous or pulsed X-rays
to create real-time moving images of internal structures.
◍ What is the role of the anti- scatter grid in the image intensifier?1. Increase
image contrast2. Increase spatial resolution3. Decrease image contrast4.
Convert x-rays into light photons.
Answer: 1. Increase image contrast
◍ How does fluoroscopy differ from conventional radiography?.
Answer: Fluoroscopy allows clinicians to observe motion and guide
diagnostic and interventional procedures in real time, unlike static images
from conventional radiography.
◍ What is the purpose of electrostatic focusing lenses within an image
intensifier?1. Reduce scatter radiation2. Funnel the photoelectrons into a
concentrated stream3. Convert photoelectrons back to light photons4. Emit
photoelectrons through photoemission.
Answer: 2. Funnel the photoelectrons into a concentrated stream
,◍ When was fluoroscopy developed?.
Answer: In the late 19th century shortly after the discovery of X-rays.
◍ What is the final image intensifier energy conversion that occurs before the
visualization of the image on a monitor?1. X-rays to light photons2.
Photoelectrons to light photons3. Light photons to an analog signal4.
Analog signal to a digital signal.
Answer: 4. Analog signal to a digital signal
◍ What are the basic principles of fluoroscopy?.
Answer: Fluoroscopy works by producing X-rays that pass through the
patient, with different tissues absorbing X-rays differently, allowing the
remaining X-rays to be detected and converted into visible images.
◍ Which of the following components collects light photons from the output
phosphor and converts them to electrons?1. Vidicon television pick- up
tube2. Charge coupled device (CCD)3. Analog to digital converter (ADC)4.
Input phosphor.
Answer: 2. Charge coupled device (CCD)
◍ What are the main components of a fluoroscopy system?.
Answer: X-ray tube, collimator, patient table or C-arm, image receptor,
image processing unit, display monitor, and control console.
◍ Which of the following is the first order of events when operating an image
intensifier?1. Light photons strike the input phosphor2. X-rays strike the
output phosphor3. X-rays strike the input phosphor4. Electrons strike the
input phosphor.
Answer: 3. X-rays strike the input phosphor
◍ What is the voltage difference between the photocathode and anode
assembly in an image intensifier?1. 20-220V2. 15,000- 18,000V3. 25,000-
30,000V4. 35,000- 45,000V.
Answer: 3. 25,000- 30,000V
◍ Using a grid in fluoroscopy will increase which two of the following?1.
, Object to image distance2. Image quality3. Source to image distance (SID)4.
Patient dose.
Answer: 2 & 4 - Image quality and patient dose
◍ What is the role of the X-ray tube in fluoroscopy?.
Answer: It generates X-rays needed for imaging.
◍ When using an image intensifier in fluoroscopic imaging, where is the grid
located?1. On the output phosphor2. On the x-ray tube3. Behind the input
phosphor4. In front of the input phosphor.
Answer: 4. In front of the input phosphor
◍ What does the collimator do in a fluoroscopy system?.
Answer: It limits the size of the X-ray beam.
◍ Which of the following is accurate regarding grids used in fluoroscopic
imaging?1. Fluoroscopic imaging grids have a lower grid ratio than
radiographic imaging grids2. Fluoroscopic imaging grids have a higher grid
ratio than radiographic grids3. Fluoroscopic grids contain a crossed pattern4.
Fluoroscopic grids tend to have a Moire affect..
Answer: 1. Fluoroscopic imaging grids have a lower grid ratio than
radiographic imaging grids
◍ What is the function of the image receptor in fluoroscopy?.
Answer: It captures the X-rays as they pass through the patient, converting
them into visible images.
◍ What type of grid orientation is often found in conventional fluoroscopic
grids?1. Crossed2. Linear3. S- Shaped pattern4. Moire pattern.
Answer: 2. Linear
◍ What are the two types of flat-panel detectors (FPDs) used in fluoroscopy?.
Answer: Indirect conversion FPDs and direct conversion FPDs.
◍ What is an advantage of modern flat-panel detectors over image
intensifiers?.
Answer: FPDs provide better image quality, lower radiation dose, and more
, compact, distortion-free imaging.
◍ In order to decrease patient dose while performing a fluoroscopic procedure
on a pediatric patient, the operator should:1. increase the grid ratio2. Use a
crossed grid instead of a linear grid3. Increase the milliamperage (mA)
station4. Remove the grid.
Answer: 4. Remove the grid
◍ What is the purpose of contrast media in fluoroscopy?.
Answer: Contrast agents enhance visualization of internal structures, such as
barium sulfate for the GI tract and iodinated contrast for vascular and
urinary systems.
◍ List some common clinical applications of fluoroscopy..
Answer: Barium swallow and GI studies, upper and lower GI series, voiding
cystourethrogram (VCUG), cardiac catheterization, angiography, orthopedic
fracture reduction, pain management injections, urology and gynecology
procedures.
◍ When performing a fluoroscopic procedure on an adult patient, the operator
notes decreased image contrast due to high scatter production. Which of the
following steps would improve the image contrast?1. Add on a grid2.
Remove the grid3. Increase the mA4. Increase the kVp.
Answer: 1. Add on a grid
◍ What are some limitations of the old image intensifier systems?.
Answer: Geometric distortion, pincushion distortion, vignetting, limited
dynamic range, and aging of phosphors and photocathodes.
◍ Crossed grids in fluoroscopic imaging are which two of the following?1.
Often used in conventional fluoroscopy2. Often used in interventional
fluoroscopy3. Two sets of led strips orientated 90 degrees from one
another4. One set of lead strips in a linear orientation.
Answer: 2 & 3 - Often used in interventional fluoroscopy and two sets of led
strips orientated 90 degrees from one another
◍ What is the main advantage of direct conversion FPDs?.
