Inobitec DICOM Viewer

6.8. Union, subtraction and intersection of structures

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Functionality is available in the Pro edition
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This tool allows you to create the unions, intersections and subtractions of structures. The button will look different depending on which instrument was last used:

PIC Union (selected by default)
PIC Subtract
PIC Subtract dilated
PIC Intersect

To use a tool that is already selected, simply click on the left side of the tool buttons. To select another tool, click on the arrow on the right of the button and select an appropriate item from the list.

6.8.1 Union

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Functionality is available in the Pro edition
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The unification of structures is the addition of one structure to another. The added structure remains unchanged. To unite structures:

  1. Select the current structure on the Segmented Structure Panel (e.g., the left lung).

  2. Click on the Union PIC button. The dialog box shown in Fig. 6.18 will be displayed.

  3. Select the structure to merge with the current one (e.g., the right lung). If you want to make the right lung invisible after the merging process, check the Hide selected structure box. To make it visible later, check the Structure visibility box for this structure.

    If you want to hide the base volume, check the Hide selected layer base volume box. If you want the base volume to be displayed, check the Structure visibility box on the segmented structure tree.

  4. If the Place the result in a new structure box is checked, a new segmented structure is created, in which the procedure result is placed. The current structure is not changed.

  5. To merge, click OK, to cancel, click Cancel.

After the merging process, the original structure will consist of the tissues contained in both structures.



6.8.2 Subtraction

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Functionality is available in the Pro edition
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The subtraction of structures is the removal of the original tissue structure present in another structure. To subtract structures:

  1. Select the current structure on the Segmented Structure Panel (e.g., the lungs).

  2. Click on the Subtract PIC button. The dialog box, similar to the one shown in Fig. 6.18, will be displayed.

  3. Select the structure you want to subtract from the current one (e.g., the rigth lung). If you want to make the right lung invisible after subtraction, check the Hide selected structure box. To make it visible later, check the Structure visibility box for this structure.

    If you want to hide the base volume, check the Hide selected layer base volume box. If you want the base volume to be displayed, check the Structure visibility box on the segmented structure tree.

  4. If the Place the result in a new structure box is checked, a new segmented structure is created, in which the procedure result is placed. The current structure is not changed.

  5. To subtract, click OK, to cancel, click Cancel.

After subtraction, the right lung tissue will be removed from the original structure (Lungs).

6.8.3 Intersection

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Functionality is available in the Pro edition
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The intersection of structures is the removal of all tissues from one structure, except those present in both structures. To intersect structures:

  1. Select the current structure on the Segmented Structure Panel.

  2. Click on the Intersect PIC button. The dialog box, similar to the one shown in Fig. 6.18, will be displayed.

  3. Select the structure you want to intersect with the current one. If you want to make the second structure invisible after intersection, check the Hide selected structure box. To make it visible later, check the Structure visibility box for this structure.

    If you want to hide the base volume, check the Hide selected layer base volume box. If you want the base volume to be displayed, check the Structure visibility box on the segmented structure tree.

  4. If the Place the result in a new structure box is checked, a new segmented structure is created, in which the procedure result is placed. The current structure is not changed.

  5. To intersect, click OK, to cancel, click Cancel.

After intersection, the current structure will consist of the tissues contained in both structures.

6.8.4 "Subtract dilated" Tool

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Functionality is available in the Pro edition
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The Subtract dilated tool performs the morphological opening operation for the radius provided after subtraction. The morphological opening procedure is performed for the voxels corresponding to the voxels obtained as a result of dilation of the structure with the same radius. The radius is provided by the user in millimeters or voxels.



To subtract structures:

  1. Select the current structure on the Segmented Structure Panel (e.g., "Segmented structure 1").

  2. Click on the Subtract dilated PIC button. The dialog box shown in Fig. 6.19.

  3. Select the structure you want to subtract from the current one (e.g., the "Segmented structure 2"). If you want to make the Segmented structure 2 invisible after subtraction, check the Hide selected structure box. To make it visible later, check the Structure visibility box for this structure.

    If you want to hide the base volume, check the Hide selected layer base volume box. If you want the base volume to be displayed, check the Structure visibility box on the segmented structure tree.

  4. In the Place the result in a new structure box is checked, a new segmented structure is created, in which the procedure result is placed. The current structure is not changed.

  5. Click the OK button to apply the settings or Cancel to cancel.

  6. In the dialog box (Fig. 6.20), set the operation radius in millimeters or voxels.



  7. To subtract, click OK, to cancel, click Cancel.