Lesson 16 Flashcards Preview

Physics 1 > Lesson 16 > Flashcards

Flashcards in Lesson 16 Deck (28)
Loading flashcards...
1

How many kinds of scanning are there?

3

2

What are the kinds of scanning? (3)

1. Mechanical scanning
2. Automatic scanning
3. Electronic scanning
- similar to automatic scanning

3

Mechanical transducer

Single element, fixed with a motor

4

What do you do with a mechanical transducer?

Place the probe on the patient and sweep it back and forth and produce a sector

5

What kind of scanning is automatic scanning? (2)

1. Live scanning
2. The probe is constantly sending out pulses and receiving echoes
- building images even when you are holding still
- shows images in sequence so it looks like a live scan

6

What do you need in order to do electronic scanning?

More than one single element
- need arrays

7

What shape are arrays?

Usually rectangular
- assembled in a row

8

How many types of arrays are there?

2

9

What are the 2 types of arrays?

1. Linear
2. Convex

10

What are the 2 ways to operate linear arrays?

1. Linear sequenced array
2. Linear phased array

11

What is a type of linear phased array?

Vector array

12

Linear array

Several elements in a row

13

What does linear sequence array involve?

Firing groups of elements at the same time
- so they overlap each other
- fast segments

14

What would the aperture be in linear sequenced array?

It would be apart of the group that you are firing
- width of the group

15

What will each group do in linear sequenced array?

Each group will produce a pulse and receive an echo
- produce a scan line of information

16

What do multiple scan lines produce?

A rectangular image

17

What is the width of the image?

The length of the array

18

What do linear sequenced array consist of?

Parallel scan lines, travelling in the same vertical direction

19

LPF

Lines per frame

20

Lines per frame

Number of scan lines in a frame

21

What makes a frame?

Individual scan lines building up

22

What is a frame?

Imaged stored in the memory
- can be retrieved

23

What does more LPF mean?

Production of better quality images

24

What are 2 types of convex arrays?

1. Convex sequenced array
2. Convex phased array

25

How does a convex/curvilinear sequenced array work?

Same and a linear sequenced array

26

What does a curvilinear sequenced array produce?

A modified sector image

27

What does the width in the scan plane determine?

The lateral resolution

28

What does an ultrasound beam consist of? (2)

1. Near zone
2. Far zone