Samsung SONOACE R5 Manual do Utilizador descarregar pdf (Página 129)

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5-5

Chapter 5 Measurements And Calculations

Optimization of Measurement Accuracy

2D Mode

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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.

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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.

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

more accurate.

M Mode

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The accuracy of time measurements can be increased when the sweep velocity and the display

format are set to high values.

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

higher values.

Doppler Mode

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

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

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Using lower frequency ultrasound increases penetration.

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The accuracy of time measurements can be increased when the sweep velocity is increased.

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

values.

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It is most important to use an optimal Doppler angle to enhance the accuracy of velocity

measurements.

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