Samsung SONOACE R7 Manual do Utilizador descarregar pdf (Página 179)

5-5

Chapter 5 Measurements and Calculations

Optimization of Measurement Accuracy

 2D Mode

X Resolution is in proportion to the frequency of the probe.

X Penetration is in inverse proportion to the frequency of the probe.

X The highest resolution can be obtained at the focus of the probe where the ultrasound beam is

narrowest.

X The most accurate measurements can be obtained at the focus depth. The accuracy decreases as the

distance from the focus increases, widening the beam width.

X Using the zoom function or minimizing the depth display makes distance or area measurements

more accurate.

 M Mode

X The accuracy of time measurements can be increased when the speed and the display format are set

to high values.

X The accuracy of distance measurements can be increased when the display format is set to higher

values.

 Doppler Mode

X It is recommended to use lower frequency ultrasound for measurement of faster blood ows.

X The size of the sample volume is limited by the axial direction of the ultrasound.

X Using lower frequency ultrasound increases penetration.

X The accuracy of time measurements can be increased when the speed is increased.

X The accuracy of velocity measurements can be increased when the vertical scale is set to smaller

values.

X It is most important to use an optimal Doppler angle to enhance the accuracy of velocity measurements.

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Samsung SONOACE R7 Manual do Utilizador Página 179