Samsung ACCUVIX XG Uživatelský manuál stáhnout pdf (Strana 243)

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Chapter 5 Measurements and Calculations

Measurement Accuracy

Measurement values can vary, depending on the nature of the ultrasound, the body’s response to

ultrasound, the measurement tools, algorithms, product settings, probe type and user operation.

Before using this product, make sure to read and understand the following information regarding the

causes of measurement errors, and measurement optimization.

Causes of Measurement Errors

Image Resolution

The resolution of ultrasound images may be limited by the available space.

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Errors due to a signal range may be minimized by adjusting focus settings. Optimizing focus

settings increases the resolution of the measurement area.

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In general, lateral resolution is lower than axial resolution. Therefore, measurements should be

performed along the axis of the ultrasound beam to obtain accurate values.

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Gain has a direct impact on resolution. Gain can be adjusted by using the Gain button for each

mode.

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In general, increasing the frequency of ultrasound enhances resolution.

Pixel Size

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An ultrasound images in the product consist of pixels.

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Since a single pixel represents the basic unit of an image, a measurement error may result in

the displacement of approximately ±1 pixel when compared to the original image size.

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However, this error becomes significant only when a narrow area in an image is measured.

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Samsung ACCUVIX XG Uživatelský manuál Strana 243