Focusing

Question 1

Intensity ____ as distance from the transdcuer increased

Answer 1

decreased

Question 2

Focusing only occurs in which portion of the beam?

Answer 2

Near zone

Question 3

Phased arrays fire how many elements at a time?

Answer 3

almost all simultaneously

Question 4

Arrays fire how many elements at a time?

Answer 4

small groups

Question 5

Focusing improves?

Answer 5

lateral resolution and transducer sensitivity

Question 6

Focusing ____ the NZL

Answer 6

decreases

Question 7

Focusing _____ divergence in the far field

Answer 7

increases

Question 8

True or False: Focusing improves axial resolution

Answer 8

False

Question 9

True or False: Focusing improves lateral resolution

Answer 9

True

Question 10

The transmit focus is also called?

Answer 10

variable focus

Question 11

Which focusing is under the sonographer’s control?

Answer 11

Transmit focus

Question 12

What is the compensation for variable focusing?

Answer 12

Frame rate

Question 13

Co-processing

Answer 13

Quasi focus technique that allows for multiple lines of sight without affecting fram rate

Question 14

Received focus is also called?

Answer 14

dynamic focus

Question 15

Increasing transducer diameter allows for the imaging of ____ structures

Answer 15

deep

Question 16

Decreasing transducer diameter allows for the imaging of ____ structures

Answer 16

superficial