Inobitec DICOM Viewer

3.12. Remove Bone Tissue

3.12.1 Remove Bone Tissue for DualScan and DualEnergy

The series in a study should contain the same number of images with identical position, one made with contrast and the other without it. To remove the bone tissue:

  1. Open any series of the study in the series fusion window by clicking the Series fusion PIC button on the toolbar. The Series fusion tab will open.
  2. Go to the study list tab.
  3. Drag the other series of images to the Series fusion tab holding the left mouse button (Fig. 3.7). The Series fusion tab will open again. If both series meet the bone tissue removal conditions, the Bones removal mode PIC button will appear on the toolbar. If the series cannot be dragged, the cursor will look like this: PIC .
  4. To remove the bone tissue, click the Bones removal mode PIC button.
  5. To set up the maximum bone density value, click on the arrow on the right side of the Bones removal mode PIC button, select the Bones removal options item from the button menu, and specify the required value in the dialog box that appears.
  6. Click the Volume Reconstruction PIC button on the toolbar.



3.12.2 Remove Bone Tissue Manually

____________________________________________________________________________________________

Functionality is available in the Pro edition
____________________________________________________________________________________________

You can remove the bone tissue for any series specifying the required parameters manually.

To remove the bone tissue manually:

  1. Open the series containing bone tissue in the volume reconstruction window.
  2. Click the Remove bones PIC button on the toolbar. A dialog box will pop up.
  3. Set the Min bones density(HU) value in the dialog box. All tissues whose density exceeds this value will be deleted.
  4. Set the Grow bones (voxels) value. This value allows you to set the thickness of the soft bone surface layer in voxels. This layer may have the same density as other tissues. In this case, if you set the minimum bone density value equal to the surface layer density, some tissues other than bones may be removed as well. To avoid this, the minimum bone density is skewed upward, and the soft bone surface layer is deleted using the Grow bones parameter.
  5. Set the Grow tissues (voxels) value. This value allows you to restore other tissues (e.g. vessels inside bones) removed together with the bone tissue. Tissues are restored only in locations contacting with bone tissue.

All these values should be adjusted experimentally. The default values are not optimum.

To remove bone tissues with a lesser density, click the Remove bones PIC button and reduce the minimum bone density value. If the value turns out to be too small, undo the last removal using the Undo PIC button, and increase the minimum bone density value during the next removal.

This tool is also available from the Volume main menu item.

3.12.3 Remove Bone Tissue for Fused Series

____________________________________________________________________________________________

Functionality is available in the Pro edition
____________________________________________________________________________________________

This tool is used for angiographic and other studies containing at least one series with contrast and without one for the same body area.

To remove the bone tissue:

  1. Fuse the series with contrast and without one in the Series Fusion window (see Section 4).
  2. Open the fused series in the Volume or Multiplanar Reconstruction window.
  3. Select the series with contrast. By default the first series is selected.
  4. Click the Subtract bones (choose layer to subtruct from first) PIC button on the toolbar. In the dialog that opens enter the name of the new series. The process may take some time. Upon completion, a series without bones will appear on the series panel for this study. Open this series in the desired mode.