What is the term for the change in direction of a sound wave crossing a tissue boundary at an oblique angle?
Which action may reduce the number of lines in a frame without a loss of temporal resolution?
During a color Doppler scan, which angle to flow would most likely result in no color being visualized?
If the speed of sound in a medium is less than the average speed of sound in soft tissue, where will the echo be placed on an image?
Which color Doppler setting can be optimized to eliminate low-frequency Doppler shifts without having any effect on higher Doppler frequency shifts?
Which describes the reflected frequency when a reflector is moving toward the sound source?
Which control determines the amount of amplification occurring in the receiver?
Which artifact is seen as a result of an increase in echo amplitude in the tissue located distal to an anechoic structure?
What is the primary interaction that occurs when sound waves encounter a smooth, flat surface?
During 3-D volume acquisition, the quality of the images is most dependent upon which factor?
Which ultrasound adjustment allows for an increased frame rate in color flow Doppler?
What reduces speckle and increases visualization of specular reflectors and attenuated structures?
Which adjustment follows the ALARA (As Low As Reasonably Achievable) principle of patient safety?