kats pre final
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A decrease in the Size to Noise ratio will result in all the following except:
A)Increased fog to the image
B)Reduces image quality
C)Less signal strength to the image
D)Improved image quality
All effect the brightness of the fluoroscopic image except
All are advantages of television image monitoring of fluoroscopy except
A)Multiple persons can view the image simultaneously
B)Electronic control of brightness level and contrast
C)Electronic image stored for later D)Provides optimum spatial resolution
All of the following are advantages of CCD receptors except
A)High signal to noise ratio
B)Eliminate distortion improving spatial resolution
D)No blooming of the image
All the following are advantages to flat panel IR except
A)They are affected by external magnetic fields
B)There is no decrease in image quality around the image periphery
C)Distortion free images
D)Improved contrast resolution over the entire image
Digital fluoroscopy has surpassed conventional fluoroscopy in the methods for which the image is obtained, the quality of the image obtained and the a reduction in patient dose during imaging. T/F?
Factors that affect brightness of fluoroscopic image include:
2. Patient size
1 and 2
1 and 3
2 and 3
1, 2, and 3
1, 2, and 3
How is the television image formed during fluoroscopy?
A)By transforming the photo electrons from the photo cathode of the image intensifying into x-ray photons
B)By transforming the remnant x-rays from the patient into visible light image
C)By transforming the remnant x-rays into an electron beam
D)By transforming the visible light image of the Image intensifier tubes output phosphor into an electrical video signal
In digital fluoroscopy, all the following reduce patient dose except
A)Pulsed x-ray beam (greatly reduced exposure by the intermittent pulse)
B)Greater sensitivity of the CCD in spot imaging (more sensitive to the light so less exposure on front end)
C)Decreased exposure time (obvious)
D)Over imaging by the physician
In the pulse-progressive fluoroscopic mode, the time required for the x-ray tube to switch off is:
A)Interrogation time Z
Multi-field (change of focal point) image intensifier tubes are required to provide _____ of fluoroscopic images.
Recording of the fluoroscopic image at the lower patient dose is accomplished by using the:
A)Vidicon camera – (has nothing to do with recording)
B)Cassette spot film – (moves back into radiographic mode, so higher technique)
C)Photospot camera – (fluoroscopy mode, less technique)
D)Plumbicon camera – (didn’t even talk about this)
The imaging modality that provides real-time, continuous image of the motion of internal structures while the x-ray tube is energized
The kV range typically used for fluoro during a barium enema is:
The key internal component of the television monitor is:
A)Electron gun – (not part of monitor)
B)Phosphorescent screen – (part of it, but not key component)
C)Brightness and contrast controls – (part of it, but not key component)
D)Cathode ray tube (television picture tube)
The sturdiest method to couple the image intensifier tube is with:
A)Fiber Optics – (this is a method to couple, more sturdy)
B)Lens coupling – (this is a method to couple, not as sturdy)
C)Cassette-based coupling – (never talked about this)
D)Photofluorospot coupling – (never talked about this)
What aspect of the digital fluoroscopy allows patient dose to be reduced compared to conventional fluoroscopy?
A)Higher mA setting – (both have higher mA station)
B)Lower kVp setting – (both have same kVp range)
C)Increased spot filming – (nonspecific, so you could increase patient dose on both)
D)Pulsed x-ray beam – (this reduces because conventional doesn’t have this option)
If the radiologist observes something during the fluoroscopic examination and would like to preserve that image for further study, a radiograph called a ______ can be taken without interruption of the dynamic examination.
Fluoroscopy is actually a rather routine type of x-ray examination except for its application in the visualization of vessels, called ________.
The two main areas of are angiography are ____and ______ radiology. .
The kilovolt peak (kVp) of operation depends entirely on the section of the___ that is being examined.
Fluoroscopic equipment allows the radiologist to select an image brightness level that is subsequently maintained automatically by varying the kVp, the mA, or sometimes both. This feature of the fluoroscope is called _______
automatic brightness control (ABC).
Illumination levels are measured in units of _____ per square meter or lux.
During fluoroscopy, maximum image detail is desired; this requires high levels of image_________ .
The brightness of the fluoroscopic image depends primarily on what 3 things
- the anatomy that is being examined,
- the kVp,
- and the mA. .
X-rays that exit the patient and are incident on the image-intensifier tube are transmitted through the glass envelope and interact with the _______, which is cesium iodide (CsI).
When an x-ray interacts with the input phosphor, its energy is converted into _____; this is similar to the effect of radiographic intensifying screens.
The output phosphor is the site where electrons interact and produce____.
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