Inobitec DICOM Viewer

3.6. Cutting Tools

There are several cutting tools on the right toolbar.

3.6.1 Polygon Cut

The tool allows you to build a polygon or area with smooth borders that the cut area is projected on. The tool is enabled/disabled using the PIC button on the toolbar.

To build a polygon

  1. Activate the Polygon Cut tool.
  2. Click the left mouse button to set the apices of the polygon marking the figure to be cut, except the last point.
  3. Fix the last point by right-clicking the mouse.
  4. To cancel an incomplete building, press Esc.

To build an area with smooth borders (Lasso mode):

  1. Activate the Polygon Cut tool.
  2. Press and hold the Shift key on the keyboard.
  3. Circle the area to be cut holding down the left mouse button.
  4. To complete the building release the left mouse button or click the right mouse button.
  5. To cancel an incomplete building, press Esc.

The part of the model to be projected on the area will be cut.

3.6.2 Inverse Polygon Cut

The tool is similar to the previous one, except that part of the model not to be projected on the area will be cut. To activate/deactivate the tool, use the PIC button on the toolbar.

3.6.3 Delete Area

The tool allows you to delete an area of a 3D model not associated with its other parts. To activate/deactivate the tool, use the PIC button on the toolbar.

3.6.4 Delete All Areas except Selected Area

The tool is similar to the previous one, except that all areas excluding the selected area are deleted. To activate/deactivate the tool, use the PIC button on the toolbar.

3.6.5 Cutting Tools Parameters

For Delete Area and Delete All Areas except Selected Area tools the following parameters can be set:

  1. Grow from surface (mm). The tissue surrounding deleted area will be deleted too. This parameter specifies the distance from the surface on which the tissue will be deleted. If this parameter is set to zero, model surface may look rough, so use a value of zero only if necessary.
  2. Min object thickness (mm). If the value is greater than zero, the tissue with a thickness less than the set value will be ignored during deletion.

This parameters for each tool are set separately.

To set these parameters, click on the arrow on the right side of the appropriate tool button and select the Parameters... item and in the dialog box that appears, specify the required values.

3.6.6 Sphere Cut, Sphere Restore and Restore by Mask Tools

Brush cut, Brush restore and Restore by mask tools allow to remove tissue within the sphere or cylinder and restore tissue deleted by cutting tools. To select one of these tools (Brush cut, Brush restore, Restore by mask) and modes (Sphere, Cylinder), click the arrow on the right side of the tool buttons. The button will look different depending on the tool that was used last:

PIC Brush cut (is selected by default)
PIC Brush restore
PIC Restore by mask

The cursor will look different depending on the mode that is selected. The cursor for Sphere mode is shown in Fig. 3.3, and the cursor for Cylinder mode is shown in Fig. 3.4.





To activate/deactivate the tool, click on the left side of the tool button. If any tool is activated, the button is highlighted.

To cut tissue:

  1. Activate the Brush cut mode by clicking PIC button.
  2. Set the tool diameter, moving the mouse holding the left button and Alt key.
  3. For the Cylinder mode set the height if it is necessary. To do it, click the arrow on the right side of the tool button and select the Cylinder settings... item. In the dialog box that appears set the cut height.
  4. Click the left mouse button in the place where you want to cut tissue. Part of the tissue will be cut. The green dot indicates where the great circle of the sphere (the base area of the cylinder) touches the surface of the model. The great circle passes through the center of the sphere and is parallel to the plane of the screen.
  5. Repeat steps 3 and 4, if necessary.

Brush restore PIC tool allows you to perform the reverse process of brush cutting.

Restore by mask PIC tool allows you to restore tissue by mask (this tool is used for segmentation). It mask is not set, this mode is analogous to the Brush restore mode. For details how to set mask see section 6.2.3.

3.6.7 Tools for intelligent volume editing

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Functionality is available in the Pro edition
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Functionality is available in the Pro edition
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The Grow (dilation) Shrink (erosion), Fill and Cut invisible volume tools allow to edit tissue within the special algorithms. The Multi-segment growing tool allows you to edit segmented structures. To select one of these tools, click the arrow on the right side of the tool buttons. The button will look different depending on the tool that was used last:

PIC Grow (dilation) (set by default)
PIC Shrink (erosion)
PIC Remove noise (opening)
PIC Remove holes (closing)
PIC Multi-segment growing
PIC Fill
PIC Cut invisible volume

The Grow (dilation) tool allows you to increase the volume by a certain value from the surface for 1 iteration. This value is specified in the Settings menu of this tool (parameter Growing radius). The increase is possible only within the original volume, for example, after the use of cutting tools. When you use this tool to edit a segmented structure, an increase is possible only within the mask. The tool is used to fine-tune the structure, if initially the required volume was not obtained.

The Shrink (erosion) tool performs the opposite action. The reduction value is specified by the parameter Growing/Shrinking radius.

The Remove noise (opening) tool allows to remove noise from the volume. This tool is equivalent to consistently applied tools Shrink (erosion) and Grow (dilation).

The Remove holes (closing) tool allows to remove little holes from the volume. This tool is equivalent to consistently applied tools Grow (dilation) and Shrink (erosion).

The Multi-Segment Growing tool allows you to simultaneously build several structures and base volume. It is used to edit segmented structures (see Section 6.4.6). If the tool is applied only to the base volume then it works like the Grow (dilation) tool.

The Fill tool allows you to fill the voids in the volume. If you are working with segmented structures, the tool is used to improve structures built on a "grainy" mask. Such masks are typical, for example, for kidneys.

The Cut invisible volume tool sets the mask according to the visible volume.

3.6.8 Remove Table

The tool allows you to delete areas similar to medical equipment table. To delete, click the PIC button on the toolbar.

To undo or redo the last action associated with cutting, use the Undo PIC and Redo PIC buttons.