US Physics 16-21

A signal with a 120 decibel dynamic range is compressed by 40 decibels. What is the dynamic range of the compressed signal?

• 40 decibels

• 120 decibels

• 3 decibels

• 80 decibels

Using pulse inversion harmonics, an image is created with 4 MHz sound. What is the resonant frequency of the transducer?

• 4 MHz

• 8 MHz

• 2 MHz

• Can not be determined

Why do contrast agents reflect sound?

• Different propagation speed

• Impedance of the agent is low

• Different speed of sound than soft tissue

• Impedance of the agent is different than that of soft tissue

When an individual inhales, the diaphragm​ __________ and venous return to the heart​​ ​____________ .

• descends; increases

• descends;

  decreases

• ascends;

  increases

• ascends; decreases

Which of the following flow patterns is associated with cardiac contraction?

• Pulsatile

• Phasic

• Spontaneous

• Continuous

The arterial blood pressure of a standing individual is 100 mmHg at the level of the heart. What is the measured blood pressure at the subject's ankle?

• 100 mmHg

• 220 mmHg

• 0 mmHg

• 90 mmHg

The Doppler Effect is observed as a change in ___________ and has units of ___________.

• amplitude; watts

• power; watts

• frequency; per second

• wavelength; millimeters

What is the resulting change in Pressure and Kinetic energy through a stenosis?

• Pressure Inc

  Kinetic Dec

• Pressure Inc

  Kinetic Inc

• Pressure Dec

  Kinetic Inc

• Pressure Dec

  Kinetic Inc

What is the range of Doppler shifts commonly measured in clinical exams?

• -10 kHz to 1 MHz

• -0.5 MHz to 0.5 MHz

• -0.02 MHz to 0.02 MHz

• None of the Above

What information does the Doppler shift furnish concerning the blood cells that produce it?

• velocity

• speed

• frequency

• density