U/S Beam

Question 1

What factors affect the shape of the U/s beam?

Answer 1

Near field vs Far field

Others: Diameter of the crystal frequency wavelength and the design of the transducer, Amount of focusing

Question 2

What is the beam width?

Answer 2

Measure of the beam in the scan Plane

Question 3

What is the intensity of the beam?

Answer 3

Is the power flowing Through a Unit area measured in watts

Question 4

Is the beam Uniform or not?

Answer 4

The beam Is not uniform.due to divergens in the further field

Question 5

Sidelobes?

Answer 5

Some of the energy from the transducer radiates at various angles to the translator face

Question 6

Grating lobes

Answer 6

Found in array Transducers.lobes various angles to the main beam

Question 7

Slice thickness?

Answer 7

Refers to the dimension of the beam at 90°

Question 8

In a central aperture, beam width and Slice thickness?

Answer 8

Equal to each other

Question 9

In a rectangular aperture slice thickness?

Answer 9

Beam width and slice thickness Varies

Question 10

Multi focal zones

Answer 10

Increase the size of the area with improve resolution plus slower frame rate hence poor Temporal resolution