RTE 1401 Final Exam fully solved & updated
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Terms in this set (345)
adjust kVp by multiplying by 2 (+/-) for every
Fixed mAs/ variable kVp
increment of ONE centimeter or inch of size
chart
difference
Fixed KVP/ variable mAs adjust mAs by multiplying (+) by 2 for every 4-5
chart centimeter or inch size difference
digital image quality brightness, contrast resolution, spatial resolution,
factors distortion exposure indicator, noise
brightness intensity of light coming through monitor
how well a system can display varying shades of gray
contrast resolution
-affected by dynamic range
determines the number of shades of gray that can be
pixel depth
displayed: 2 to the 14th power= 16,384 shades of gray
measured in Lp/ mm
spatial resolution
-2.5- 5 Lp/mm in digital imaging
size & shape
distortion
effected by SID, OID, and alignment
number displayed on the processed image to indicate
the level of x-ray exposure received to the digital
exposure indicator
image receptor.
-red, yellow or green
, random disturbance that reduces of obscures image
noise clarity
-SNR and quantum noise
The ratio of the speech signal (intended signal) to that
Signal to Noise Ratio
of the background noise
(SNR)
-HIGH is ALWAYS best
lack of sufficient data (photons) - results in blotchy or
quantum noise
mottled image. Increase mAs to fix
complex math equations used to maintain image
algorithms
quality
range of shades a digital system is capable of
Dynamic range
displaying as seen by the human eye
the range of exposures that can be used and still
exposure latitude result in the capture of a diagnostic-quality image
-DR has more than film-screen imaging
night vision; uses rods of retina which are peripherally
scotopic vision
located
photopic vision daylight vision; uses cones, centrally located
an electronic vacuum tube that converts beam of light
to electrons, then back to light, increasing the light
intensity in the process
Image Intensifier
-brightens image up to 5,000 times brighter than
conventional floural
-5 principal parts
input phosphor screen, photocathode, electrostatic
5 principal parts of Image
focusing lenses, accelerating anode*, output
Intensifier
phosphor screen
Dead man's switch apply positive pressure to switch (not constant power)
, a 6"- 23" screen bonded to the curved surface of the
flourscopy tube
input phosphor screen -made of cesium iodide which acts as a scintillator
-converts XR to light
-curved to maintain distance to focal point
emits e- when stimulated by light in a process called
photoemission due to it being made of cesium and
photocathode
antimony compounds
-bonded directly to input phospher
negatively charged plates that repel the e- to
electrostatic focusing
accelerate and focus them
lenses
-gradient in operation
2.5 cm screen located at the opposite end of the
output phosphor screen image intensifier that converts e- to intensified light
-made of zinc cadmium sulfide
located at the neck of the intensifier near output
accelerating anode* phospher, it sets the e- stream in motion at a constant
velocity
multiple sizes of input screen; may be used to magnify
Multifield Image Intensifier
the image
Ratio of the number of light
photons at the output phosphor
Flux Gain
to the number of x-rays at the
input phosphor
Ratio of the square of the
diameter of the input phosphor
Minification Gain
to the square of the diameter of
the output phosphor.
is equal to the product of Minification Gain and Flux
Total Brightness Gain Gain.
MG x FG
(latest version verified for accuracy) | Latest!!
Save
Terms in this set (345)
adjust kVp by multiplying by 2 (+/-) for every
Fixed mAs/ variable kVp
increment of ONE centimeter or inch of size
chart
difference
Fixed KVP/ variable mAs adjust mAs by multiplying (+) by 2 for every 4-5
chart centimeter or inch size difference
digital image quality brightness, contrast resolution, spatial resolution,
factors distortion exposure indicator, noise
brightness intensity of light coming through monitor
how well a system can display varying shades of gray
contrast resolution
-affected by dynamic range
determines the number of shades of gray that can be
pixel depth
displayed: 2 to the 14th power= 16,384 shades of gray
measured in Lp/ mm
spatial resolution
-2.5- 5 Lp/mm in digital imaging
size & shape
distortion
effected by SID, OID, and alignment
number displayed on the processed image to indicate
the level of x-ray exposure received to the digital
exposure indicator
image receptor.
-red, yellow or green
, random disturbance that reduces of obscures image
noise clarity
-SNR and quantum noise
The ratio of the speech signal (intended signal) to that
Signal to Noise Ratio
of the background noise
(SNR)
-HIGH is ALWAYS best
lack of sufficient data (photons) - results in blotchy or
quantum noise
mottled image. Increase mAs to fix
complex math equations used to maintain image
algorithms
quality
range of shades a digital system is capable of
Dynamic range
displaying as seen by the human eye
the range of exposures that can be used and still
exposure latitude result in the capture of a diagnostic-quality image
-DR has more than film-screen imaging
night vision; uses rods of retina which are peripherally
scotopic vision
located
photopic vision daylight vision; uses cones, centrally located
an electronic vacuum tube that converts beam of light
to electrons, then back to light, increasing the light
intensity in the process
Image Intensifier
-brightens image up to 5,000 times brighter than
conventional floural
-5 principal parts
input phosphor screen, photocathode, electrostatic
5 principal parts of Image
focusing lenses, accelerating anode*, output
Intensifier
phosphor screen
Dead man's switch apply positive pressure to switch (not constant power)
, a 6"- 23" screen bonded to the curved surface of the
flourscopy tube
input phosphor screen -made of cesium iodide which acts as a scintillator
-converts XR to light
-curved to maintain distance to focal point
emits e- when stimulated by light in a process called
photoemission due to it being made of cesium and
photocathode
antimony compounds
-bonded directly to input phospher
negatively charged plates that repel the e- to
electrostatic focusing
accelerate and focus them
lenses
-gradient in operation
2.5 cm screen located at the opposite end of the
output phosphor screen image intensifier that converts e- to intensified light
-made of zinc cadmium sulfide
located at the neck of the intensifier near output
accelerating anode* phospher, it sets the e- stream in motion at a constant
velocity
multiple sizes of input screen; may be used to magnify
Multifield Image Intensifier
the image
Ratio of the number of light
photons at the output phosphor
Flux Gain
to the number of x-rays at the
input phosphor
Ratio of the square of the
diameter of the input phosphor
Minification Gain
to the square of the diameter of
the output phosphor.
is equal to the product of Minification Gain and Flux
Total Brightness Gain Gain.
MG x FG
