Lesson 16

Question 1

How many kinds of scanning are there?

Answer 1

3

Question 2

What are the kinds of scanning? (3)

Answer 2

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

Question 3

Mechanical transducer

Answer 3

Single element, fixed with a motor

Question 4

What do you do with a mechanical transducer?

Answer 4

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

Question 5

What kind of scanning is automatic scanning? (2)

Answer 5

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

Question 6

What do you need in order to do electronic scanning?

Answer 6

More than one single element

- need arrays

Question 7

What shape are arrays?

Answer 7

Usually rectangular

- assembled in a row

Question 8

How many types of arrays are there?

Answer 8

2

Question 9

What are the 2 types of arrays?

Answer 9

1. Linear

2. Convex

Question 10

What are the 2 ways to operate linear arrays?

Answer 10

1. Linear sequenced array

2. Linear phased array

Question 11

What is a type of linear phased array?

Answer 11

Vector array

Question 12

Linear array

Answer 12

Several elements in a row

Question 13

What does linear sequence array involve?

Answer 13

Firing groups of elements at the same time

• so they overlap each other
• fast segments

Question 14

What would the aperture be in linear sequenced array?

Answer 14

It would be apart of the group that you are firing

- width of the group

Question 15

What will each group do in linear sequenced array?

Answer 15

Each group will produce a pulse and receive an echo

- produce a scan line of information

Question 16

What do multiple scan lines produce?

Answer 16

A rectangular image

Question 17

What is the width of the image?

Answer 17

The length of the array

Question 18

What do linear sequenced array consist of?

Answer 18

Parallel scan lines, travelling in the same vertical direction

Question 19

LPF

Answer 19

Lines per frame

Question 20

Lines per frame

Answer 20

Number of scan lines in a frame

Question 21

What makes a frame?

Answer 21

Individual scan lines building up

Question 22

What is a frame?

Answer 22

Imaged stored in the memory

- can be retrieved

Question 23

What does more LPF mean?

Answer 23

Production of better quality images

Question 24

What are 2 types of convex arrays?

Answer 24

1. Convex sequenced array

2. Convex phased array

Question 25

How does a convex/curvilinear sequenced array work?

Answer 25

Same and a linear sequenced array

Question 26

What does a curvilinear sequenced array produce?

Answer 26

A modified sector image

Question 27

What does the width in the scan plane determine?

Answer 27

The lateral resolution

Question 28

What does an ultrasound beam consist of? (2)

Answer 28

1. Near zone

2. Far zone