Oral Radiology Final Studyguide Flashcards
In a radiograph the border of the max sinus appears _____, and the maxillary sinus lumen appears ____-
Radiopaque; radiolucent
What does the focusing cup do?
Negatively charged - directs electrons
What type of radiograph will take an anterior-posterior view?
Lateral-cephalometric
What is this?
PA cephalometric
What is this?
Lateral cephalometric
What is the error in this pano (blurry)?
Too far back
What happens most often?
Compton scatter
What causes the deleterious effect from radiation?
Hydrolysis of water
Correct statement of orbital shell:
L has a larger binding energy to M
Components that are associated with deterministic risk:
erythema & xerostomia
Components associated with stochastic risk:
leukemia & cancer
Smaller voxel size will have ____ storage & ____ resolution
High & high
smaller voxel size effect on radiation:
high (higher exposure)
Correct sequence of CBCT:
Basis image –> projection image —> volumetric data set
What combination gives you the LOWEST radiation exposure?
CMOS, rectangle, long distance
Smaller voxel yields:
high resolution & high radiation
What is affected by basis image data and the most important factor in CBCT:
Time
If you decrease mA you:
decrease density
T/F: CCD, compared to CMOS & PSP has lower radiation
CCD (lower radiation & lower exposure)
When on sagittal view of CBCT it scrolls:
right to left
Factors that affect sharpness:
a) source to object
b) object to receptor
c) focal spot size
d) source to object, object to receptor
e) all of the above
ALL OF THE ABOVE
Increasing magnification =
Long object to receptor distance
Lateral fossa is located by:
Maxillary lateral incisors/canine
In a pano, the horizontal plane aligns with:
focal trough
