4

It is used for diagnostic, utilizing high frequency sound waves.

Refers to sound waves beyond the audible range.

It is any sound with higher frequency and consequently cannot be heard. Its uses include measuring distance and detecting foreign or a n abnormal mass within the abdominal cavity.

It is a high frequency greater than 20,000 cycles per second waveform of mechanical energy requiring some types of medium, liquid or solid for its propagation

ultrasound velocity is approximately

one principle of ultrasound

Force of sound

Bouncing back of soundeflected sound

Transmit and receive

rhythmic disturbances which travel through space or matter such as air, water and metal.

Compression waves produced by vibration.

Sound produced by irregular vibrations. Unpleasant to hear.

SID

SDD

SOD

FACTORS THAT AFFECT THE STRENGTH OF ECHOES

The creation of an image from sound is done in three steps :

PHYSICAL PARAMETERS OF ULTRASOUND/ CHARACTERISTICS OF SOUND WAVES

distance measured from one crest of the next wave.

principle of wavelength

is a measure of the number of occurrences of a repeating event per unit time

principle of frequency

low frequency =

sound waves are absorbed in more superficial tissues (3 MHz)

a time it takes to complete a single cycle. The length of time required for one (1) wavelength or 1 cycle.

nonnegative scalar measure of a wave's magnitude of oscillation. Loudness, intensity.

unit of measure describing the intensity of diagnostic UTZ.

speed of the sound waves. The distance travelled by the wave per unit time.

relationship of velocity and density

At 1 MHz, sound travels through soft tissue at

at 1 MHz, sound travels through compact bone at