Oral Radiology Final Studyguide

Question 1

In a radiograph the border of the max sinus appears _____, and the maxillary sinus lumen appears ____-

Answer 1

Radiopaque; radiolucent

Question 2

What does the focusing cup do?

Answer 2

Negatively charged - directs electrons

Question 3

What type of radiograph will take an anterior-posterior view?

Answer 3

Lateral-cephalometric

Question 4

What is this?

Answer 4

PA cephalometric

Question 5

What is this?

Answer 5

Lateral cephalometric

Question 6

What is the error in this pano (blurry)?

Answer 6

Too far back

Question 7

What happens most often?

Answer 7

Compton scatter

Question 8

What causes the deleterious effect from radiation?

Answer 8

Hydrolysis of water

Question 9

Correct statement of orbital shell:

Answer 9

L has a larger binding energy to M

Question 10

Components that are associated with deterministic risk:

Answer 10

erythema & xerostomia

Question 11

Components associated with stochastic risk:

Answer 11

leukemia & cancer

Question 12

Smaller voxel size will have ____ storage & ____ resolution

Answer 12

High & high

Question 13

smaller voxel size effect on radiation:

Answer 13

high (higher exposure)

Question 14

Correct sequence of CBCT:

Answer 14

Basis image –> projection image —> volumetric data set

Question 15

What combination gives you the LOWEST radiation exposure?

Answer 15

CMOS, rectangle, long distance

Question 16

Smaller voxel yields:

Answer 16

high resolution & high radiation

Question 17

What is affected by basis image data and the most important factor in CBCT:

Answer 17

Time

Question 18

If you decrease mA you:

Answer 18

decrease density

Question 19

T/F: CCD, compared to CMOS & PSP has lower radiation

Answer 19

CCD (lower radiation & lower exposure)

Question 20

When on sagittal view of CBCT it scrolls:

Answer 20

right to left

Question 21

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

Answer 21

ALL OF THE ABOVE

Question 22

Increasing magnification =

Answer 22

Long object to receptor distance

Question 23

Lateral fossa is located by:

Answer 23

Maxillary lateral incisors/canine

Question 24

In a pano, the horizontal plane aligns with:

Answer 24

focal trough