Specialized Imaging Flashcards Preview

SP18: Oral Radiology > Specialized Imaging > Flashcards

Flashcards in Specialized Imaging Deck (19):
1

T/F: The midsagittal plane of the head is perpendicular to the receptor in a lateral ceph.

False

Lateral ceph - receptor parallel

Post-anterior projection - receptor perpendicular

2

A ________ is taken with the chin touching the receptor.

Water's projection

3

A ____________ is taken with head and neck extended as far back as possible with the vertex of the skull on the receptor.

submentovertex projection

4

T/F: MDCT has superior soft tissue characterization compared to CBCT.

True

5

T/F: You can use contrast medium with an MDCT.

True

6

T/F: Voxels are in 2D while pixels are in 3D.

False

Pixel - 2D
Vixel - 3D

7

T/F: Window level determines brightness, window width determines contrast.

True

Level - center CT number

Width - number above and below window level

8

Water is displayed by which Hounsfield unit?

0

9

What is the Hounsfield number for bone?

Anywhere from 700-3000

10

What type of imaging allows for functional evaluation of tissue vascularity and temporal tissue density changes?

Perfusion MDCT after intravenous injection

11

Which imaging gives two data-sets with different energy levels to reduce noise and metal artifacts?

Dual Energy CT

12

What are the three steps of an MRI?

1. Magnetic field
2. Radio-frequency pulse
3. Relaxation

13

________ is often used to evaluate head and neck squamous cell carcinomas.

PET/CT

14

What agent is best used for cancer cell imaging?

FDG

15

What agent is best used for new bone formation?

F-fluoride

16

_______ uses sound waves to acquire a real time image.

Ultrasound

17

Cysts would appear as what color in an ultrasonic image?

Black

18

What would be the best way to image soft tissue?

MRI

19

T/F: Cone beam CT offers less radiation than other CT methods.

True