ultrasound

what parts of the body does sonography allow you to see

• tendons/ligaments

• muscles

• joints

• vessels

• internal organs

what are the 4 types of probes

• curvilinear probe

• linear, high frequency probe

• endo-cavity probe

• cardiac probe

what is a curvilinear probe used for

used in general OB and abdomen

what is the linear high frequency probe used for

used for vascular and small parts. and MSK applications

what is the endo cavity probe used for

vaginal, rectal applications. very useful in early pregnancy

what is the cardiac probe used for

used for echocardiography applications

what is the frequency range typically for sonographic scanners

2-18 megahertz

do higher frequencies produce a larger or smaller wavelength

smaller

what is the piezoelectric effect

it converts kinetic or mechanical energy into electrical energy due to crystal deformation. this is how ultrasound transducers receive sound waves

what is the inverse piezoelectric effect

the application of an electric field to a crystal causes the realignment of the internal dipole structure. cause the crystal to lengthen or contract and converts electrical energy into mechanical or kinetic energy. ultrasound transducers produce sound waves.

what are ultrasound transducers

the probe being used

what is ultrasound (wave)

a longitudinal mechanical wave and propagates through a medium

what does frequency mean

the number of wavelengths per unit of time

what unit is used for frequency

hertz

what does acoustic impendence mean

when sound wave encounters a material with a different density