Samsung SONOACE X6 Manual do Utilizador descarregar pdf (Página 5)

Chapter 5.Measurements and Calculations 5 - 5

Optimization of Measurement Accuracy

▐ 2D Mode

- Resolution is in proportion to the frequency of the probe.

- Penetration is in inverse proportion to the frequency of the probe.

- The highest resolution can be obtained at the focus of the probe where the ultrasound

beam is narrowest.

- 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.

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

measurements more accurate.

▐ M Mode

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

display format are set to high values.

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

set to higher values.

▐ Doppler Mode

- It is recommended to use lower frequency ultrasound for measurement of faster blood

flows.

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

- Using lower frequency ultrasound increases penetration.

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

increased.

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

to smaller values.

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

measurements.

▐ Color/Power Doppler Mode

- A protocol is not specified for images in Color Doppler Mode or Power Doppler Mode.

Therefore, the same limitations imposed when measurements are taken in B/W images

apply to the accuracy of the measurements taken in these modes.

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Samsung SONOACE X6 Manual do Utilizador Página 5