Exam III Flashcards
Unit of effective dose:
REM
High electron generating then stops:
tungsten target
Cells more resistant to radiation will:
low capacity of reproduction; more differentiation
Increase in cone length will:
increased sharpness, higher density
What image is between X-RAY SOURCE and ROTATION CENTER:
Ghost image
Does not cause ionization:
coherent radiation
Object moves distal, source moves distal:
lingnual
What is the tissue modification factor?
Effective dose
Factors affecting caries presentation:
angle of X-ray beam & degree of cavitation
What is an intraoral radiograph sign of present or past periodontal disease?
alveolar bone loss at furcation of molar
No threshold=
cancer
What is in the cathode?
filament & focusing cup
Mesial of #30:
within physiological limits
The narrowest portion of the focal trough is in:
incisal area
Central plane of image layer:
focal trough
Predisposition to perio disease:
tilted/rotated
What is the distortion if the teeth are located outside of the central place TOWARDS the ROTATION CENTER:
stretched wide in a horizontal direction
what affects caries diagnosis?
both vertical & horizontal angulation
A short object to receptor distance will decrease unsharpness; smaller focal spot increases unsharpness
First true; second false
Hard palate is superimposed on maxillary roots:
chin up
Increasing KeV does ______ energy of photon and ____ penetration
increases; higher penetration