Class 5 Quiz Review

What would you expect to see in a Convex Sequential Array Transducer with a malfunctioning crystal?

• Vertical band of dropout

• Overall Decreased Image Quality

• Horizontal band of dropout

• completely black image

A complete scan of an ultrasound beam is called a _____.

• Bandwidth

• Scale

• Frame

• Frequency

What are the two different types of transducer operations?

• Sequential

• Phased

• Linear

• Convex

T/F: Scan lines from linear sequential arrays are parallel to each other.

• True

• False

What would you expect to see from a Linear Sequential Array transducer with a malfunctioning crystal?

• Vertical band of dropout

• Horizontal Band of Dropout

• A completely dark image

• scattering

You are scanning with a single crystal transducer. The crystal is damaged, what would you expect to see?

• Erratic Steering

• Loss of entire image

• Vertical band dropout

• Horizontal band dropout

All of the following are elements of imaging resolution except:

• contrast

• detail

• concurrent

• temporal

T/F: Increasing the frequency will lower the value of axial resolution.

• True

• False

A malfunctioning crystal in an annular array transducer will result in:

• A horizontal band of dropout

• A vertical band of dropout

• loss of the entire image

• erratic steering

What is the equation for Axial Resolution?

• LARRD = SPL/2

• Axial resolution = SPL x T/2

• Axial Resolution = wavelength x frequency/2

• LARRD = SPL x wavelength /2