Veterinary Radiology I
Terms
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- Xrays are generated in the:
- CATHODE TUBE
- The filament in the cathode are heated, producing:
- ELECTRONS
- As MA is increased, the electrons are __________ also
- INCREASED
- The period of time in which electrons (x-ray) are allowed to leave the tube happens in fractions of _________
- SECONDS
- Electrons and the period for their release determine how many xrays are _________
- AVAILABLE
- mAs
- =number of electrons=number of xrays produced
- The _________in the xray tube attracts electrons
- anode
- The anode has to be able to stand high _____ due to the heat produced by the collision of electrons with the _________
- heat; target
- Anode
-
-made of tungsten
-99% of energy is heat
-1% xray
-angled so the xrays exit the metal housing through the window and penetrate the cassette` - Electrons speed is needed to have _______
-
high-energy impact
-done by applying 1000's of volts across the xray tube
-high voltage produces xrays with high penetrating power - KvP
-
-controls the penetrating power of the xray
-penetrating power of the xray
-influences density and increased blackness of film
-affects contrast - Density
- affected by mAs
- Higher the mAs the greater the ________________
- density
- # of xrays is directly proportional to_________
- density of film
- The higher the kVp,
- the more xrays reach the film surface
- Radiographic Contrast
- density difference bt two areas on finished radiograph
- If the difference is ______then the radiograph has _______contrast
- great;high
- If there is only a _________ difference then the radiogrpah has _________ contrast
- slight; low
- Scatter radiation
- has an effect on film contrast, especially with HIGH kVp
- The use of _____ and fast screens are recommended to minimize scatter radiation
- GRIDS
- To view film correctly:
-
-viewed on evenly lit view box in semi-darkened room
-film needs to be positioned on box correctly
box should be clean and all bulbs working - Patients head
- top of view box
- patient's right side
- on viewer's left (like you were shaking hands with pt.)
- All lateral views
- should face viewer's LEFT saide with spine at TOP
- When evaluating rads, ask:
-
room too light og dark?
proper penetration of film - More exposure will turn the film _________
- BLACKER
- Underexposure will cause fil to come out too______
- LIGHT
- If rad is too light then:
- INCREASE MAS OR KVP
- If penetration is inappropriate the _____ should be changed
- KVP
- KvP________for a light film; _______for dark film
- Increased;decreased