Radiographic Imaging - Chapter 7
attenuation - correct answer ✔✔process by which the nature of the primary radiation is changed
(partially absorbed or scattered) as it travels through the patient
classes of radiation - correct answer ✔✔Primary radiation
Scatter radiation
Absorbed radiation
Remnant radiation
requirements for the production of x-rays - correct answer ✔✔(1) Vacuum (tube housing)
(2) Source of electrons (filament)
(3) Method to accelerate the electrons(voltage) rapidly
(4) Method to stop the electrons (target)
primary radiation - correct answer ✔✔x-ray beam after it leaves the x-ray tube and before it reaches the
patient's body
remnant radiation - correct answer ✔✔radiation resulting after the beam exits the patient's body
scatter radiation - correct answer ✔✔an x-ray photon that interacts with the body's matter in such a way
that the resulting photon continues its travel in a different direction
radiolucent - correct answer ✔✔allow x-ray photons to pass through comparatively easily
radiopaque - correct answer ✔✔materials are not easily penetrable
milliampere-seconds (mAs) - correct answer ✔✔the parameter that controls the total amount or
quantity of x-radiation produced
, millamperage - correct answer ✔✔the measure of electrical current passing through the x-ray tube
time (in seconds) - correct answer ✔✔the duration of the exposure
kilovolt peak (kVp) - correct answer ✔✔the measure of the electrical pressure ( potential difference)
forcing the current through the tube; affects the quality and quantity of photons produced
source-to-image distance (SID) - correct answer ✔✔distance between the point of x-ray emission in the
tube (focal spot) and the IR
controlling factors by the radiographer - correct answer ✔✔focal spot size, primary beam configuration,
quantity and quality of scatter, and speed of the image receptor
latent image - correct answer ✔✔invisible image created after exposure but before processing
intensifying screens - correct answer ✔✔thin layers of polyester plastic coated with layers of
luminescent phosphor crystals
quantum mottle - correct answer ✔✔insufficient light is emitted from the phosphors and produces an
image that is grainy
computed radiography - correct answer ✔✔cassette or cassette based digital; uses storage phosphor
reusable plates to produce image, the active chemical being barium fluorohalide
direct capture DR - correct answer ✔✔devices that convert incident x-ray energy directly into an
electrical signal which sends the signal to the computer for processing and viewing; contains amorphous
selenium (a-Se)
indirect capture DR - correct answer ✔✔devices that absorb x-rays and convert them into light using a
two-step process; the light is detected by an area-charge-coupled device, and then converted into an
electrical signal that is sent to the computer for processing and viewing; contains amorphous silicon (a-
Si)
attenuation - correct answer ✔✔process by which the nature of the primary radiation is changed
(partially absorbed or scattered) as it travels through the patient
classes of radiation - correct answer ✔✔Primary radiation
Scatter radiation
Absorbed radiation
Remnant radiation
requirements for the production of x-rays - correct answer ✔✔(1) Vacuum (tube housing)
(2) Source of electrons (filament)
(3) Method to accelerate the electrons(voltage) rapidly
(4) Method to stop the electrons (target)
primary radiation - correct answer ✔✔x-ray beam after it leaves the x-ray tube and before it reaches the
patient's body
remnant radiation - correct answer ✔✔radiation resulting after the beam exits the patient's body
scatter radiation - correct answer ✔✔an x-ray photon that interacts with the body's matter in such a way
that the resulting photon continues its travel in a different direction
radiolucent - correct answer ✔✔allow x-ray photons to pass through comparatively easily
radiopaque - correct answer ✔✔materials are not easily penetrable
milliampere-seconds (mAs) - correct answer ✔✔the parameter that controls the total amount or
quantity of x-radiation produced
, millamperage - correct answer ✔✔the measure of electrical current passing through the x-ray tube
time (in seconds) - correct answer ✔✔the duration of the exposure
kilovolt peak (kVp) - correct answer ✔✔the measure of the electrical pressure ( potential difference)
forcing the current through the tube; affects the quality and quantity of photons produced
source-to-image distance (SID) - correct answer ✔✔distance between the point of x-ray emission in the
tube (focal spot) and the IR
controlling factors by the radiographer - correct answer ✔✔focal spot size, primary beam configuration,
quantity and quality of scatter, and speed of the image receptor
latent image - correct answer ✔✔invisible image created after exposure but before processing
intensifying screens - correct answer ✔✔thin layers of polyester plastic coated with layers of
luminescent phosphor crystals
quantum mottle - correct answer ✔✔insufficient light is emitted from the phosphors and produces an
image that is grainy
computed radiography - correct answer ✔✔cassette or cassette based digital; uses storage phosphor
reusable plates to produce image, the active chemical being barium fluorohalide
direct capture DR - correct answer ✔✔devices that convert incident x-ray energy directly into an
electrical signal which sends the signal to the computer for processing and viewing; contains amorphous
selenium (a-Se)
indirect capture DR - correct answer ✔✔devices that absorb x-rays and convert them into light using a
two-step process; the light is detected by an area-charge-coupled device, and then converted into an
electrical signal that is sent to the computer for processing and viewing; contains amorphous silicon (a-
Si)
