SPI PRACTICE Questions Exam 1

What best describes a sound wave?

What MUST be different on the two sides of an interface for refraction to occur?

The characteristic acoustic impedance of a medium equals the product of

Ultrasonic attenuation is considered to consist of two parts scattering and absorption. Absorption is

Which of the following has the greatest effect on the focal length of a single element transducer?

Spatial pulse length is the product of the number of cycles in the pulse and the

Manipulating the output power control of an ultrasound instrument does NOT affect the

What will be affected by the power?

On pulse-echo equipment, the transducer actually transmits

Ultrasonic intensity is measured in units of

watt=

What fraction of ultrasonic energy is typically reflected at soft tissue interfaces?

If the reflected signal intensity from Object 1 is ten times greater than Object 2, what is the dB difference in reflected intensity between Object 1 and Object 2?

Which of the following is characteristic of diffuse reflection?

When ultrasound waves are traveling through tissue that contains many very small scatterers ("Rayleigh scatterers"), the amount of sound that is scattered would:

The intrinsic resonant frequency (native frequency) of a transducer is determined by:

If the distance to a reflector doubles, the time between pulse transmission and echo detection at the transducer:

Which of the following would place an upper limit on the pulse repetition rate for an echocardiogram?

The reflection coefficient for an air/soft tissue interface is 99.9% when the sound beam hits it at normal incidence. Structures posterior to an interface of this nature cannot be visualized since virtually all of the sound is

The focal zone of a single-element transducer:

When pressure is applied to an ultrasonic transducer crystal, it causes the crystal to:

The acoustic impedance of the matching layer on the face of an ultrasonic probe is typically: