Untitled Quizs

Which of the following probes creates a beam with the deepest focus?

• a. 4mm diameter, 4 MHz

• b. 6mm diameter, 8 MHz

• c. 6mm diameter, 2 MHz

• d. 5mm diameter, 8 MHz

The acoustic impedance of the matching layer is ___________ the acoustic impedance of skin

• less than

• equal to

• greater than

• not comparable to

what is the frame rate of each image of the ultrasound system is created in 0.02 sec (1/50 sec)?

• 20 Hz

• 100 Hz

• 50 Hz

• 15 Hz

A pair of 9 mm diameter probes are identical except for frequencies, which are 3 mhz and 6 mhz. which sound beam will spread out more in the far field.

• 3 mhz

• 6 mhz

• 4 mhz

• 2 mhz

How thick are the Active Element and Matching Layer of a transducer?

• 1/2 and 1/4 of the wavelength thick respectively

• 1/3 and 1/5 of the wavelength thick respectively

• 1/4 and 1/6 of the wavelength thick respectively

• 1/2 and 1/3 of the wavelength thick respectively

What is the ability to accurately distinguish two structures lying close together called?

• resolution

• contrast

• clarity

• definition

which of the following locations is the deepest?
a. end of the fresnel zone
b. end of the focal zone
c. end of the fraunhofer zone
d. end of the near zone.

• end of the fresnel zone

• end of the focal zone

• end of the fraunhofer zone

• end of the near zone.

List the components of the Transducer (there's how many)?

• Case, electric shield, acoustic insulator, PZT/element, wire, matching layer, backing/damping material.

• Case, electric shield, acoustic insulator, PZT/element, wire, matching layer.

• Case, electric shield, PZT/element, wire, matching layer, backing/damping material.

• Case, electric shield, acoustic insulator, wire, matching layer, backing/damping material.

Which of the following transducers best describe as mechanically steered and fixed, single focused?

• a. annular phased array

• b. annular array

• c. mechanical

• d. linear phased

What are off-axis sound beams?

• Side lobes/Grating lobes

• Direct sound waves

• Reflected sound waves

• Echoes