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Radiology definition

Radiology

TermDefinition
Frequency The number of waveforms that strike an object during a given time period
Electromagnetic spectrum Comprised of three components: Energy (eV) Frequency (Hz) and Wavelength.
Bucky tray used to hold xray film cassette under tabletop
Cathode Negatively charged electrode within the x-ray tube head that is made of a filament and a focusing cup
Energy electrical, chemical, mechanical, thermal, nuclear, and electromagnetic
Heel effect Difference in intensity of the x-ray beam between the cathode and the anode side of the machine
Anode positively charges electrodes in the x-ray tube head
Rotating Anode positively charged anode that rotates while attracting negative electrons released from the cathode
Stationary anode positively charged anode that does not rotate while attracting negative electrons released from cathode
ALARA as low as reasonably achievable
Ammonium thiosulfate x-ray fixative
Anechoic areas that do not generate echo on ultrasound
angiography positive-contrast study to evaluate vascular system
annular array transducers with crystals aligned in rings
arthrography contrast study used to evaluate joints
attenuate loss of amplitude of ultrasound waves as they travel through tissues
barium sulfate positive contrast medium; used to evaluate GI tract
bisecting angle dental technique where beam is positioned perpendicular to a line that bisects the angle formed from the long axis of the tooth and the film
b-mode ultrasound display mode that displays returning echoes as bright dots with varying degrees of brightness in relation to the returning signal
caudal towards the tail
caudocrainal caudal to cranial
cholecystography positive contrast study for gallbladder and bile duct studies
collimating device structure located below the tube window that has set lead shutter to limit the size of the beam
computed radiology digital system that requires a cassette w/ an intensifying screen composed of photostimulable phosphors
contrast density difference between two areas or structures; shades of gray on the finished xray
contrast medium substance that can be places into body by injection or ingestion to create hight image contrast
crainl towards the head
craniocaudal cranial to caudal
cystography contrast study for urinary bladder
density degree of blackness of image
detail degree of sharpness of image
detective quantum efficiency sensitivity and accuracy of digital radiology system
developer converts sensitized silver halide crystals into black metallic silver
digital radiography system that incorporates an image receptor with the xray table
dorsopalmer dorsal to palmer surface
dorsoplantar dorsal to plantar surface
dorsoventral dorsal to ventral surface
dose creep increases in exposure factors made in an attempt to reduce the amount of image noise
dosimeter monitoring device
double contrast contrast technique that uses a positive and negative agent
elongation a dental image error where the xray beam is perpendicular to the tooth; causes tooth to appear longer
emulsion xray film layer containing silver bromide and silver iodide crystals
esophagography contrast study of esophagus
film base polyester support layer for film
film speed degree to which xray film is sensitive to ionizing radiation
fixer removes unchanged silver halide from emulsion layer; stops developing process
fluoroscopy continuous xrays to produce real-time images
focal-film distance distance from tube head to image receptor
focused grid lead strips that are placed in increasing angles to match that of the divergence of the xray beam
foreshortening dental image error; beam is perpendicular to film causing tooth to appear shorter
gain control modifies the strength of returning ultrasound echo
gastrography contrast study of stomach
grayscale bit depth refers to number of shades of gray in digital image
grid device placed between table top and image receptor that consists of lead strips that absorb scatter
grid cutoff decreased number of photons that reach the image receptor due to misalignment of the grid
grid ratio ratio of the height of the lead strips to the distance between them
hydroquinone component of developer that increases image contrast and produces blackness
hyperechoic high intensity echo; appears bright on ultrasound
hypoechoic low echo return; appear as dark gray images on ultrasound
intensifying screens structure inside xray cassette made from tiny crystals that fluoresce once exposed to xray
inverse-square law guidelines that the intensity of the xray beam at a given loaction if inversely proportional to the square of the distance from the xray source
isoechoic areas that with returning echoes are the same of surrounding ultrasound images
kilovoltage energy from electrons when they reach the anode (kVp): peak kilovoltage:
latent image image formed on xray filmed but not yet visible that results from exposure of the silver halide crystals to radiation
Lower GI study contrast study for rectum, colon, cecum
millamperage used to control the quantity of the electrons that will be produced and released from the filament during xray
m-mode motion mode; ultrasound display mode (mainly for echocardiography)
myleography contrast study of subarachnoid space around spinal cord
negative contrast study radiolucent gases that appear black on image
nephrogram stage of excretory urogram where opacification of the renal parenchyma shows vascular supply and kidney perfusion
non screened film type of film that has greater sensitivity to direct radiation; no intensifying screen
palmardorosal from palmer surface of forelimb to dorsal surface of body
parallel grid comprised of lead strips that are set perpendicular to the surface
parallel technique placement of film parallel to the long axis of the tooth. which central beam positioned perpendicular to the film
phenidone component of xray developer that produces gray densities
photostimulable storage phosphor imagining plate intensifying screen used with computed radiology systems
pixel picture element: smallest component of digital image matrix
plantardorsal from plantar surface of hindlimb to dorsal surface of body
positive contrast agent agent containing elements of high atomic numbers that are more radiopaque to xray than soft tussue or bone
radiolucent substance that allows xray to penetrate with limited absorption and will appear black on image
radiopaque substance that does not allow xrays to penetrate and absorbs more xrays than tissue or bone and will appear white on image
retrograde infusion of an agent in reverse to how the discharge normally flows
sante's rule method used to estimate kVp using the calculation 40 plus twice the measurement in cm |
screen speed the speed at which the crystals convert xray into visible light to be used by the film
screened film type of film that requires the use of intensifying screens and has great sensitivity to light
silver halide crystals that respond to electromagnetic radiation and produce a latent image with screened film
time the duration in seconds that the anode has a positive charge and is receiving electrons
transducer ultrasound probe that generates the sound waves and also serves to receive the returning echoes
triiodinated compounds a positive contrast agent of iodinated media that contains three atoms of iodine per molecule
upper GI study contrast study of small intestine
urethrography contrast study of urethra
viscosity state of substance that is thick, sticky, and semifluid in consistency
voxel location of a pixel within the image matrix that corresponds to an area within a 3-dimensional volume of tissue
wavelength distance between successive crest or troughs of a wave; comprised of frequency and amplitude
Created by: laurap19
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