Pulse-Echo Instrumentation

Which principle follows a 1 to 1 correspondence between the pulse and the scan line?

• Principle 1

• Janell's Principle

• Huygens' Principle

• Principle 2

What is an example of volume presentation?

• 2D slices

• Surface renderings

• Transparent views

• All of the above

Which of the following helps distinguish between echoes of slightly different intensities?

• Axial resolution

• Temporal resolution

• Contrast resolution

• Temporal resolution

What does the pulser do?

• Decreases the differences between the smallest and largest amplitudes 

• Interrogates the incoming voltage at regular intervals and determines its value

• Protects the input components of the amplifier

• Generates the voltages that drives the transducer 

What is used to show the motion of cardiac structures?

• A mode

• M mode

• B mode

• C mode

Temporal resolution is determined by the:

• Medium

• Beam width

• Frame rate

• Element thickness

What are the typical number of channels in sonographic instruments?

• 25, 50, 75

• 66, 130, 194

• 62, 126, 190

• 64, 128, 192

Which of the following does NOT occur in preprocessing?

• B color

• Pixel interpolation

• Persistence

• Edge enhancement

What approach uses a series of pulses and gaps rather than a single driving pulse?

• Harmonic imaging

• Panoramic imaging

• Coded excitation

• Spatial compounding

What is gain?

• Just a random setting on the machine

• The ratio of amplifier output to electric power input 

• Eliminates frequencies

• Just a random button on the machine