Hip Segmentation

Thresholding:

Open the desired project. Select Thresholding in the main toolbar and click apply with the standard settings

as for Bone (CT). Rename the mask “Bone Threshold” by clicking green in the mask tab.

Thresholding with Draw Profile Line:

Scroll to axial slice 40 and select “New Mask”. And rename it as Bone Profile Line.

Select the Profile Line under measurements tab in the main toolbar.

Draw a Profile Line on the bone. Now a profile line dialog box is displayed. By clicking on Start Thresholding button again a thresholding dialog box is

displayed as shown in the below screenshot. Click Apply.

Region Growing:

Select region growing form the icon toolbar. Select source as Bone Threshold and target as new mask. Select multilayer checked so that region growing will be done on the entire

dataset instead of just one layer. Click somewhere on the hip And rename the new mask as Bone2 Threshold.

Repeat the above procedure for the Bone Profile Line and rename the new mask as Bone2 profile Line.

Calculate 3D: Click on Bone2 Threshold mask and select calculate 3D. This opens a calculate 3D dialog box. Now select High quality and click calculate.

This creates the 3D object which is displayed in the below right corner.

Repeat the above procedure to calculate 3D object for the Bone2 Profile line Mask.

Editing Tools:

Crop Mask:

Select the bone2 threshold mask. Click on crop mask under segmentation. Enter the desired coordinates so that only the lower portion of the hip and spine

are shown in the mask. Click ok to continue.

Editing Mask: Select bone2 threshold mask. Zoom to axial slice 115. Click Edit Mask under segmentation and select Erase. Set the type to Circle, dimensions to 20 each. Erase as shown in the below screenshot. Continue to erase each slice up to 175.

Do a region grow on it and calculate a 3D model on high quality.

Dynamic Region Grow:

Make sure the Bone2 profile line is selected then scroll to slice 70 in the axial view.

Click on Dynamic Region Growing tool. Check the ‘Multiple layers’ and ‘fill Cavities’ boxes.

Click on the aorta as shown below. Rename it as Aorta.

Calculate 3D model for Aorta on high quality.

A 3D Model is displayed for Aorta as shown below.

3D Tools:

There are various other 3D tools that allow different visualization options for 3D models.

Click on any 3D Object’s glasses under visible. This hides or unhides the 3D model.

Clicking on the Contour visible glasses will highlight the contours of the 3D object in 2D views.

Clicking on the triangle visible column allows to view the triangulated surface mesh of the object.

Clicking on the Clipping tab allows to move through the clipping plane when moving through the axial or coronal or sagittal views.

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