any body part exceeding this measurement requires the use of a grid to reduce scatter.
C. 10cm
the focal spot originates from the:
C. tungsten target
a low out output xray machine utilizes a stationary anode
a. true
b. false
b. false
during the developing process metallic silver is converted to silver halide crystals
a. true
b. false
b. false
radiographic ___ is the degree of blackness on a finished radiograph
a. density
b. contrast
a. density
a ___ scale of contrast generally produces a more diagnostic radiograph
a. long
b. short
a. long
the ___is most responsible for the quanity of xray produced and radiographic density, vs ___ is most responsible for the quality of the xray beam and the radiographic scale of contrast
a. kVp;mAs
b. mAs;kVp
b. mAs;kVp
the higher the grid ratio the moe effective the grid is at absorbing scatter
a. true
b. false
a. true
elctrons travel:
A. toward the anode in the xray tube
all of the following are types of somatic damage caused by radiation except
B. gene mutation
what is the maximum permissible dose of radiation that a person can receive according to state and federal regulation
A. 0.05 sv/year
if the cassette is not directly under the primary beam, how will the film look like?
D. the part of the film not directly under the primary beam is white or unexposed
the temperature of the filament is controlled by:
B. mA setting
an underexposed film appears___; to correct this___
B. too light; increase kvp or ma
how does kvp affect scatter radiation?
D. as kvp increase, scatter radiation can increase
you hae determined that the penetration is inadequate for a particular abdominal film and the film has an overall white apperance. what should you do next?
C. increase kvp by 10-15%
all of the following are necessary for xray production except
D. all of the above
which of the following ways to decrease your exposure to radiation
D. all of the above
all of the following could cause a radiograph to be too dark except
B. xray tube failure
the most common cause for a radiograph turning yellow is the devloper not being completely washed off before going into the fixer
a. true
b. false
b. false
used to measure the thickness of the area to be xrayed
cailper
list the five subject densities from lowest density to highest density
1. gas--jet black
2. fat
3. water
4. bone
5. metal--bright white
is a non image forming radiation that moves in all directions and results from xrays bouncing off the objects
scatter radiation
is disortion of anatomic structures so that the image appears longer than actual size due to the xray beam not being directed perpendicular to the film
elongation
is distortion of anatomic structures so that the image appears longer than the actual size due to the xray beam not being directed perpendicular to the film surface
foreshortening
is distortion of anatomic structures when the image appears larger than normal
magnification
the ___ refers to a decrease of xray intensity on the anode side of the xray beam caused by the anode target angle
heel effect
are devices used to monitor our exposure to radiation
dosimeter
refers to the distance between the source of xray and the image receptors or film
source image distance
the cathode has a ___ charge
the anoe has a ___ charge
negative
postive
Author
Anonymous
ID
70096
Card Set
radiology 1
Description
radiation safety, xray production, exposure factor, film processing, radiographic quality, film evaluation