Samsung SONOACE X6 Manual de usuario descargar pdf (Pagina 3)

Chapter 5.Measurements and Calculations 5 - 3

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.

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

focus settings increases the resolution of the measurement area.

- 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.

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

for each mode.

- In general, increasing the frequency of ultrasound enhances resolution.

▐ Pixel Size

- An ultrasound images in the product consist of pixels.

- 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.

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

measured.

▐ Ultrasound Velocity

- The velocity of ultrasound used during measurement is usually 1,540 m/s on average.

- The velocity of ultrasound may vary depending on the cell type.

- The possible range of error is between approximately 2-5% depending on the structure

of cells (about 2% for typical cells and about 5% for fatty cells).

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Samsung SONOACE X6 Manual de usuario Pagina 3