Diagnostic Imaging Flashcards Preview

Structure and Function Test 1 > Diagnostic Imaging > Flashcards

Flashcards in Diagnostic Imaging Deck (37)
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1
Q

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

A

Radiodensities

2
Q

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?

A

Most dense = foreign metals

Least dense = Air

3
Q

More radiodense structures are referred to as

A

Radio opaque

4
Q

Less radiodense structures are referred to as

A

Radiolucent

5
Q

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

A

Identified

6
Q

What are some examples of water density?

A

Muscle, connective tissue, blood, cartilage, etc

7
Q

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

A

No

8
Q

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

A

Cartilage

9
Q

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

A

Exist

10
Q

When contrast material is placed into blood vessels

A

Angiography

11
Q

When contrast material is placed into the subarachnoid space

A

Myelography

12
Q

When contrast material is placed into the kidneys

A

Pyelography

13
Q

When contrast material is placed into the digestive tract

A

Barium contrast and/or air contrast

14
Q

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

A

Film

15
Q

Film that is less exposed will be

A

Whiter than more exposed film

16
Q

In radiography:

  1. ) High radiodensity structures appear
  2. ) Low radiodensity structures appear
A
  1. ) Whiter

2. ) Blacker

17
Q

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

A

Gray scale

18
Q

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

-because they are not dependent on radiodensity

A

MRI

19
Q

Are two dimensional images of three dimensional structures

-so ventral structures will be superimposed on dorsal structures

A

Radiographs

20
Q

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

A

In “front” of the other

21
Q

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

A

Projection

22
Q

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

A

Anterior projection (PA projection)

23
Q

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

A

Posterior projection (AP projection)

24
Q

When the patients left side faces the film

A

Left lateral projection

25
Q

When the patients right side faces the film

A

Right lateral projection

26
Q

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

A

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

27
Q

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

A

Perpendicular

28
Q

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

A

CT (computerized tomograph) and MRI scans

29
Q

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

A

CT

30
Q

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

A

Body

31
Q

Uses a magnetic field and pulse radiofrequency (RF) waves

A

MRI

32
Q

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

A

Image

33
Q

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

A

Different

34
Q

In a CT, fat is usually very

A

Dark (radiotranslucent)

35
Q

In an MRI, fat is usually very

A

White (high signaling)

36
Q

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

A

Axial (cross-sectional) images

37
Q

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?

A

Objects closer to film = smaller

Objects further from film = larger

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