Diagnostic Imaging Flashcards Preview

Structure and Function Test 1 > Diagnostic Imaging > Flashcards

Flashcards in Diagnostic Imaging Deck (37):
1

Adjacent structures can be seen in radio imaging when they have different

Radiodensities

2

The radiodensities are:
1.) Foreign metals
2.) Enamel
3.) Bone
4.) Water density
5.) Fat
6.) Air

Which is the most dense and which is the least dense?

Most dense = foreign metals

Least dense = Air

3

More radiodense structures are referred to as

Radio opaque

4

Less radiodense structures are referred to as

Radiolucent

5

Anything that has a different radiodensity than it's nabor can be

Identified

6

What are some examples of water density?

Muscle, connective tissue, blood, cartilage, etc

7

Muscle can be distinguished from an adjacent bone, but can we distinguish ligaments from cartilage?

No

8

A growth plate within a bone can be seen because the growth plate is

Cartilage

9

Contrast material with high (or low) radiodensity can be placed into hollow organs to provide contrast that otherwise would not

Exist

10

When contrast material is placed into blood vessels

Angiography

11

When contrast material is placed into the subarachnoid space

Myelography

12

When contrast material is placed into the kidneys

Pyelography

13

When contrast material is placed into the digestive tract

Barium contrast and/or air contrast

14

Because materials of higher radiodensity absorb more x-ray than do material of low radiodensity, less radiation reaches the

Film

15

Film that is less exposed will be

Whiter than more exposed film

16

In radiography:
1.) High radiodensity structures appear
2.) Low radiodensity structures appear

1.) Whiter
2.) Blacker

17

In modern radiography, electronic capture of the x-ray replaces film and then a computer assigns the

Gray scale

18

The same grey scale used for radiography can be applied to CT scans but NOT to

-because they are not dependent on radiodensity

MRI

19

Are two dimensional images of three dimensional structures

-so ventral structures will be superimposed on dorsal structures

Radiographs

20

A single radiograph does not allow you to determine which structure is

In "front" of the other

21

Orientation of the patient relative to the x-ray source and the film (detector)

-named based off of which surface of patients body is closest to film

Projection

22

Patient's anterior side faces the film and their posterior side faces the x-ray source

Anterior projection (PA projection)

23

The patients posterior side faces the film and the anterior side faces x-ray source

Posterior projection (AP projection)

24

When the patients left side faces the film

Left lateral projection

25

When the patients right side faces the film

Right lateral projection

26

Always viewed as if you are facing the patient (i.e. patient's right is on your left), regardless of whether it is an anterior or a posterior projection

Frontal projections (anterior (PA) or posterior (AP))

27

It is common to take two images of the same region that are in projections that are

Perpendicular

28

Allow you to view an image that appears to be a section through the body

CT (computerized tomograph) and MRI scans

29

X-rays are passed through the body from multiple directions and collected by sensors in

CT

30

These signals are then analyzed and transformed into a gray scale by a computer to provide an image of a
particular level of the

Body

31

Uses a magnetic field and pulse radiofrequency (RF) waves

MRI

32

After each RF pulse, the emitted energy from the body is collected and analyzed and converted into an

Image

33

Since CT and MRI are based on different technologies, the interpretation of their gray scale is

Different

34

In a CT, fat is usually very

Dark (radiotranslucent)

35

In an MRI, fat is usually very

White (high signaling)

36

Are always viewed as if you are looking up into a supine patient from the patients feet

Axial (cross-sectional) images

37

Let's say you are looking at two images both focused on the heart, but in one image the heart is much larger than the other. Which image has the heart closer to the film?

Objects closer to film = smaller

Objects further from film = larger

Decks in Structure and Function Test 1 Class (61):