Chapter 10: SPI Study Guide

What is the minimum distance that two structures, positioned front-to-back or parallel to the sound beam?

• Axial Resolution

• Lateral Resolution

• External Focusing

• Internal Focusing

What is the minimum distance that two structures, positioned side by side, can be apart and still produce two distinct echoes on an ultrasound image?

• Axial Resolution

• Lateral Resolution

• Internal focusing

• External focusing

What does LARRD stand for?

• Long

  Axis

  Range

  Radius

  Depth

• Longitudinal

  Axis

  Range

  Radius

  Depth

• Longitudinal

  Axial

  Range

  Radial

  Depth

• Long

  Axial

  Range

  Radial

  Deep

What does LATA stand for?

• Lateral

  Angular

  Transverse

  Azimuthal

• Lateral

  Axial

  Transverse

  Angular

• Longitudinal

  Axis

  Transverse

  Azimuthal

• Longitudinal

  Axial

  Transverse

  Angular

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

• Axial Resolution

• Lateral Resolution

• Resolution

• Focusing

Axial resolution is measured with units of

• distance

• time

• frequency

• Intensity

If there are more cycles in a pulse, the numerical value of range resolution is

• greater

• lesser

• same

If a new pulsed transducer has many cycles in its pulse, the image accuracy ___

• improves

• degrades

• remains the same

(High or low) frequency transducers generally have the best range resolution

• High

• Low

Which of the following transducers has the poorest axial resolution?

• 1.7 MHz and 4 cycles/pulse

• 2.6 MHz and 3 cycles/pulse

• 1.7 MHz and 5 cycles/pulse

• 2.6 MHz and 2 cycles/pulse

Answer explanation

This is the longest pulse. It has the lowest frequency and the most ringing (more cycles/pulse)