RADR 1201 Ch 7 Radiographic Imaging
Questions and Answers (100% Correct
Answers) Already Graded A+
attentuation [ Ans: ] process by which a beam of radiation
is reduced in energy when passing through tissue or other
matls.
automatic rescaling [ Ans: ] process by which images are
produced with uniform brightness and contrast,
regardless of the amount of exposure
Brightness [ Ans: ] Function of a display monitor; changes
image lightness/darkness
Computed Radiography (CR) [ Ans: ] Cassette-based digital
radiography; the digital acquisition modality that uses
storage phosphor plates to produce images
contrast [ Ans: ] contrast between adjacent densities on a
radiographic image
Denisity [ Ans: ] degree of darkening or blackness exposed
and processed photographic or radiographic film
directly related to xray exposure hitting the receptor
primarily affected by mAs and SID
,digitial radiography (DR) [ Ans: ] cassete less image
receptor systems that convert xray energy into a digital
electronic signal for manipulation and display
Direct Capture DR [ Ans: ] devices that convert incident x-
ray energy directly into an electrical signal, typically using
a photoconductor as the x-ray absorber and a thin-film
transistor as the signal collection area, which then sends
the electrical signal to the computer for processing and
viewing
distortion [ Ans: ] misrepresentation of the true size or
shape of an object
size ___ is called magnification
shape___ is called true distortion
exposure indicator [ Ans: ] a numeric representation of the
quantity of exposure received by a digital image receptor
exposure latitude [ Ans: ] range of exposures that can be
used and still result in the capture of a diagnostic-quality
image
fog [ Ans: ] undesirable exposure to the image receptor
by limiting the size and shape of the primary beam to the
area of interest, we are decreasing the probability of the
production of scatter radiation.
, grid [ Ans: ] device consisting of thin lead strips designed
to permit primary radiation to pass while reducing scatter
radiation by absorption
half value layer [ Ans: ] amount of filtration necessary to
reduce the intensity of the radiation beam to one half its
original value
usually aluminum
Image receptor [ Ans: ] medium used to capture the image
for recording, such as x-ray film or a digital imaging plate
major influence on:
size and sharpness of image
indirect capture [ Ans: ] devices that absorb xrays and
convert them into light: the light is then detected by an
area-charge coupled device or thin film transistor array in
concert with photodiodes, and then converted into an
electrical signal that is sent to the computer for
processing and viewing
intensifying screen [ Ans: ] layer of luminescent crystals
placed inside a cassette to expose x-ray film efficiently
and thereby significantly reduce patient dose
inverse square law [ Ans: ] mathematic formula that
describes the relationship between radiation intensity and
distance from the source of the radiation
Questions and Answers (100% Correct
Answers) Already Graded A+
attentuation [ Ans: ] process by which a beam of radiation
is reduced in energy when passing through tissue or other
matls.
automatic rescaling [ Ans: ] process by which images are
produced with uniform brightness and contrast,
regardless of the amount of exposure
Brightness [ Ans: ] Function of a display monitor; changes
image lightness/darkness
Computed Radiography (CR) [ Ans: ] Cassette-based digital
radiography; the digital acquisition modality that uses
storage phosphor plates to produce images
contrast [ Ans: ] contrast between adjacent densities on a
radiographic image
Denisity [ Ans: ] degree of darkening or blackness exposed
and processed photographic or radiographic film
directly related to xray exposure hitting the receptor
primarily affected by mAs and SID
,digitial radiography (DR) [ Ans: ] cassete less image
receptor systems that convert xray energy into a digital
electronic signal for manipulation and display
Direct Capture DR [ Ans: ] devices that convert incident x-
ray energy directly into an electrical signal, typically using
a photoconductor as the x-ray absorber and a thin-film
transistor as the signal collection area, which then sends
the electrical signal to the computer for processing and
viewing
distortion [ Ans: ] misrepresentation of the true size or
shape of an object
size ___ is called magnification
shape___ is called true distortion
exposure indicator [ Ans: ] a numeric representation of the
quantity of exposure received by a digital image receptor
exposure latitude [ Ans: ] range of exposures that can be
used and still result in the capture of a diagnostic-quality
image
fog [ Ans: ] undesirable exposure to the image receptor
by limiting the size and shape of the primary beam to the
area of interest, we are decreasing the probability of the
production of scatter radiation.
, grid [ Ans: ] device consisting of thin lead strips designed
to permit primary radiation to pass while reducing scatter
radiation by absorption
half value layer [ Ans: ] amount of filtration necessary to
reduce the intensity of the radiation beam to one half its
original value
usually aluminum
Image receptor [ Ans: ] medium used to capture the image
for recording, such as x-ray film or a digital imaging plate
major influence on:
size and sharpness of image
indirect capture [ Ans: ] devices that absorb xrays and
convert them into light: the light is then detected by an
area-charge coupled device or thin film transistor array in
concert with photodiodes, and then converted into an
electrical signal that is sent to the computer for
processing and viewing
intensifying screen [ Ans: ] layer of luminescent crystals
placed inside a cassette to expose x-ray film efficiently
and thereby significantly reduce patient dose
inverse square law [ Ans: ] mathematic formula that
describes the relationship between radiation intensity and
distance from the source of the radiation
