Samsung SONOVET R5 Manual do Utilizador descarregar pdf (Página 111)

Chapter 4 Diagnosis Modes

4-29

3D Mode

The 3D Mode displays tissues or objects in the human body as three-dimensional images inste-ad of two-

dimensional images.

The 3D mode uses the Volume data acquired by the probe as continuous 2D images for ren-dering,

producing three-dimensional volume data displays of objects that can better assist in the diagnosis process.

Volume rendering refers to the calculation process used in formulating a 3D volume structure from 2D

scans. Using the gray value of the light path through each pixel of the 2D image, the corresponding voxel, or

volume element, of the 3D image is calculated. The rendering algorithm determines the way the way the 3D

structure is visualized. Surface rendering is employed in the SONOVET R5.

How to Improve 3D Image Quality

X

Consider the direction, division and size of the viewpoint, as well as the visibility of an object.

X

Before 3D scanning, adjust the contrast of the specic textures in 2D Mode.

X

The ROI box determines the contents of the image box to be rendered. The images outside the

ROI box, except for the ultrasound data, are not included in the rendering process and are cut out.

X

The bigger the ROI box, the slower the rendering speed. Therefore, set an appropriate ROI box

size.

X

To determine surface contour, the surfaces of objects should be insulated with hypo-echoic

textures - such as amniotic uid - which don’t generate echos.

X

To obtain a high quality 3D surface, adjust the low-threshold value.

X

In order to acquire a clear image from the ROI box start boundary to the specic surface, noise

can be eliminated if the gray scale value is smaller than the surface value.

X

High-threshold is generally set at the maximum value of 255. If the Surface Rendering

Algorithm is higher than the threshold value, it marks the boundaries of the surface. The

boundary can be adjusted with the threshold-high slider.

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Samsung SONOVET R5 Manual do Utilizador Página 111