Radiology Flashcards
X rays discovered
Roentgen, Nov 8th 1895
Rollins
Developed guidelines for protection of patients, lab rats
Roentgenology
Study or science of radiation as used in medicine and dentistry
Radiolucent
E- pass, not dense, shows black
Radiopague
E- do not pass=dense, appears white
Direct sensor
To computer
Attenuate
Stope the electrons, shows up radiopague whereas dentin is less dense
Indirect sensor
Simple film which goes into a processor-optime
X-rays are produced
Bombarding tungsten target with high V e- go to anode at high speeds
Thermionic emission
Term to describe boiling off of electrons
Filament
Coil of tungsten which emits electrons when heated
Focussing cup
Negatively charged molybdenum
Tungsten target
Anode
Focal spot
Are w/in target where e- directed, smaller gives sharper image
Smaller focal spot
Sharper image
Bermsstrahlung
Higher energy e- is slowed by protons in nucleus
Characteristic radiation
E- knocks out inner shell electrons; unstable vacancy, electrons fall down/emit photons
Controls speed of e- from cathode to anode
kV and mA
Controls quality of x ray beam
KV
MA
Controls # of electrons and quantity of e- higher=darker
Higher mA =
Darker
Radiographic contrast
Related to quality of x-radiation, controlled by kV
High contrast
Short scale and less shades of gray
Low contrast
Long scale (more colors) more shades of gray
Image is produced by
E- emitted from cone-tissue-attenuated-some e- pass and hit sensors
Contrast controlled by
Kv
Examples of radiolucencies
Caries, fossa, sinus, pathology
Radiopague ex;
Dentin, enamel, calculus, amalgam, restoration, calculus
Most radiopague
Amalgam restoration
DEJ
Grey to white enamel
Lamina dura
Radiopague covering between root and bone