Radiography Flashcards

1
Q

As high speed electrons strike the target in an x-ray tube, ________ are produced

A

Bremsstrahlung and characteristic x-rays

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

The inherent filtration in a diagnostic x-ray tube results from ___________ and is usually specified in terms of ________.

A

Components of the x-ray tube itself;

mm Al equivalent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Typical x-ray transformers for general radiography have a power rating of about _______.

A

100 kW

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the relationship between the mean free path (MFP) and the half-value layer (HVL)?

A

MFP = 1.44 x HVL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The increase in x-ray beam intensity from the target end to the filament end of an x-ray tube is due to ___________.

A

The heel effect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What design feature(s) is(are) used in x-ray tubes to manage the potentially excessive heat production in the anode?

A

Angled anode, rotating anode, and use of materials with high heat-storage capacity like tungsten

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How does adding filtration affect patient dose?

A

Patient dose is reduced since lower energy x-rays (which may not penetrate the patient) are removed.

** This applies to fixed technique and AEC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

The heel effect can be reduced by ______.

A

Increasing the source to image distance (SID)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How do you calculate the grid ratio?

A

= height of the septa divided by the width of the interspace material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Common values for grid ratios for radiographic units are ____

A

8-12

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the nyquist spatial frequency of a detector?

A

1 / (2 * detector element size)

**Note: the spacing between detector elements is sometimes referred to as the pitch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly