CBCT Flashcards Preview

SP18: Oral Radiology > CBCT > Flashcards

Flashcards in CBCT Deck (27):
1

T/F: CBCT images the area in a slice by slice fashion.

False

Images as a volume

2

T/F: CBCT uses an area detector.

True

3

T/F: Several rotations are needed to get a CBCT image.

False

One rotation

4

T/F: Routine CBCT imaging is the standard of care.

False

Only when will aid in diagnosis based on clinical exam

5

What are the limitations of CBCT?

Image noise and poor soft tissue contrast

6

T/F: CBCT has a submillimeter resolution.

True

7

What is the advantage to image-intensifier detectors?

Compatible with bridging to other softwares (CAD/CAM)

8

What are some disadvantages to image-intensifier detectors?

Larger, more sensitive to distortion, more calibration needed, earlier need for replacement

9

The ________ is the part of the detector used to amplify the electrical signal from the x-ray attenuation.

scintillator

10

_________ is defined as the ability to subtle changes in grayscale and distinguish from background noise.

Contrast resolution

*ability to see different densities

11

________ is defined as the ability of an imaging system to record separate structures positioned close to each other.

Spatial resolution

12

T/F: All metal including RPDs should be removed prior to CBCT imaging.

True

13

T/F: The largest field of view possible should be used when taking CBCT image.

False

Smallest FOV that will see what you need to see

14

What is typically included in a medium FOV scan?

Typically both arches

15

What determines the spatial resolution?

Voxel size

16

T/F: To achieve a sharper image, reduce the object-to-detector distance and increase the source-to-object distance.

True

17

T/F: Smaller voxel size will equal a higher spatial resolution.

True

18

What would be the result of a higher number of projections?

1. Higher spatial resolution
2. Greater contrast resolution
3. Increased radiation dose

19

T/F: A 180 degree scan mode is adequate for implant treatment planning.

True

Want 360 for pulp canals

20

_________ are seen in CBCT when sharp changes in density are present.

Streak artifacts

21

What is a beam hardening artifact?

Center is very dark with bright edges

22

What is a starburst artifact?

Object sends streaks into nearby tissues

23

T/F: CBCT is much better for detecting proximal caries.

False

24

T/F: CBCT is much better at detecting perio disease.

False

Maybe bone craters and furcations

25

T/F: There is benefits for routine CBCT imaging in orthodontics.

False

26

T/F: CBCT is a good tool for analyzing airway obstruction.

True

27

T/F: The dentist is only responsible for reading the teeth in a CBCT scan.

False

Responsible for everything in the scan