the education and credential issed in one state is approved in another state
bone densitometry is
a specialized x-ray machine and procedure that measures bone mineral content
primary radiation
the radiation that leaves the x-ray tube. not processed can't see the image
radiation field
the squared area of the x-ray beam that strikes the patient and x-ray table is radiation field
central ray
an imaginary line in the center of the x-ray beam and perpendicular to the long axis of the x-ray tube is central ray
image receptor (IR)
during a radiographic exposure x-rays from the tube are directed through the patient to the image receptor. receives the energy of the x-ray beam and forms the image of the body part
remnant radiation
the radiation that exits the patient on the opposite side
latent image
unseen image contained within the plate phosphor
attenuation is
absorption of the x-rays by matter
the primary source of scatter is
the patient
scattered radaition
primary beam x-rays that leave the body and travel in all directions. scatter radiation exits the patient in all directions or 360 degress
what is the differnce in energy between the primary-beam radiation and the scattered radiation?
scattered radiation has less energy
the unwanted radiation exposure on the x-ray image caused by scatter radiation is called
scatter radiation fog
x-rays exit the tube port through an opening called the
tube port
tube housing
the x-ray tube is surrounded by a lead-lined device
computed radiography (CR)
filmless x-ray system that uses a digtial format to produce images
the x-ray room has an area that protect the limited operator form scatter radiation and is called the
control booth
the mechanism on the x-ray tube crane that provides stops and locks it into place is called the
detent
visible image
processing will covert the latent image into a visible image called manifest
grid and bucky
the device that protects the IR image receptor from being fogged by scatter radiation. movable device under the x-ray table thats contains a grid and holds the IR. grid reduces scatter
collimator
box-like device that allows the limited operator to vary the size of the radiation field. X-Ray field
how can you determine the location of the central ray?
turn on the collimator light. the crosshair in the center of the illuminated radiation field indicates the location of the central ray
what is the location of remnant radaition
between the patient and the IR on the side of the patient opposite that of the x-ray tube
what should you do before attempting to move the x-ray equipment
release the appopriate lock(s)
where would you look to find the x-ray tube housing
on the underside of the x-ray tubehousing
how might you determine the size of the radiation field without actually measuring it
by reading the scale on the face of the collimator
many x-ray projections are done with the patient standing or sitting upright using what device?
upright cassette holder
longitudinal (tube motion)
along the long axis of the table
transverse (tube motion)
across the table at right angles to longitudinal
vertical (tube motion)
up and down increasing or decreasing the distance between the tube and the table
rotational (tube motion)
allows the entire tube stand to turn on its axis
angular (tube motion)
tilt, roll permits angulation of the tube allows the tube to aimed at the wall
trendelenburg position
head end to be lower than the feet 15 degrees
transformers
produce high voltage and low milliamperage for x-ray production