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Flashcards in Chapter 1 Deck (38):
1

What are the five basic densities?

Air
Fat
Soft tissue or fluid
Calcium
Metal

2

Dense objects appear ____ on an x-ray

White

3

Air appears ______ on conventional radiographs.

Blackest

4

How does fat appear on a radiograph?

Gray, somewhat darker than soft tissue

5

______ appears the most dense on radiographs as it absorbs the most x-rays?

Calcium

6

What usually absorbs all x-rays and appears the "whitest"?

Metal (ex- bullets, barium)

7

What is the term used for "white" on a conventional radiograph?

Increased Density
Opaque

8

What is the term used for "black" on a radiograph?

decreased density
lucent

9

What is the term for white on a CT?

Increased (high) attenuation
Hyperintense or hyperdense

10

What is the term for black on a CT?

Decreased (low) attenuation
Hypodense

11

WHat is the term for "white" on a MRI?

Increased signal intensity
Bright

12

What is the term for "black" on an MRI?

Decreased (low) signal intesnity
Dark

13

What is the term for "white" on US?

Bright
Increased echogenicity

14

What is the term for "black" on US?

Decreased echogenicity
Sonolucent

15

In nuclear medicine what is the term for "white"?

Increased tracer uptake

16

In nuclear medicien what is the term for "black"

Decreased tracer uptake

17

In barium studies what is the term for white?

Radiopaque

18

In barium studies what is "black"?

Nonopaque
Radiolucent

19

How much radiation do you get from flying in an airplane for an hour?

0.3 mrem/ hour

20

When are risks the greatest risks during pregnancy?

Weeks 5-10

21

If you suspect there is a leakage in the intestines, what form of of contrast can't you use?

Barium

21

which takes longer, MRI or CT?

MRI

21

What is the contrast used with MRI?

Gadolinium

21

In an MRI how does fat appear?

Light

22

In an MRI how does CSF appear?

Dark

23

What is there a risk of with use of gadolinium?

Nephrogenic systemic fibrosis (NSF)

24

What type camera does nuclear medicine use?

Gamma Camera

25

What is an advantage of nuclear medicine?

Gives functional information

26

These are all examples of what? Technicium-99, Iodine-131, Fluoride-18

Radioactive elements for nuclear medicine

27

What can you do with a PET scan to get more detail?

Marry it up with a CT scan

28

Why can some people not get MRIs?

Claustrophobic
Can't hold still
Availability
Time factors
Cost

29

PET scan allows you to see____ activity.

Metabolic activity. allows you to see how metabolic the tumor is

30

What is PEt scan used for?

Tumor localization
Metastatic disease

31

What is the ideal imaging for children?

Ultrasound

32

What appears white in an US?

Calcium, (ecogenic items)

33

What appears black in an US?

Fluid (anechoic)

34

How do masses appear on US?

Dark Grey (hypoechoic)

35

HOw does soft tissue appear on US?

Medium grey (isoechoic)