Inobitec DICOM Viewer

2.17. Visualize Images

2.17.1 Select CLUT

Select the CLUT (colour look-up table) from the drop-down menu on the rendering setup panel (Fig. 2.29).



2.17.2 Edit CLUTs List

To edit list, open CLUTs setup tab by clicking the CLUTs PIC button. The tab is shown in Fig. 2.30.



CLUTs setup panel is located on the right-hand part of the window (Fig. 2.31).



The CLUTs list edit buttons are located on the top of the panel.

PIC Add a new CLUT as a copy of the current one adds a new CLUT as copy of the selected one
PIC Add a new group adds a new group of CLUTs
PIC Remove the selected CLUT/group deletes the selected CLUT or group. Predefined groups and some CLUTs cannot be deleted
PIC Reset the selected CLUT to its original state sets up default parameters for the selected CLUT
PIC Edit configuration/group opens the CLUT or group setup dialog

Groups contains several CLUTs (e.g., WL, CT) and are intended for the structuring of the list. They are marked by the arrow (Fig. 2.32) on the drop-down menu (Fig. 2.29).



To add a new group, set up the following parameters on the dialog box (Fig. 2.33):

  1. Name: any name of group;
  2. Required tags: labels that must contain CLUTs to be included in the group.



2.17.3 CLUT Parameters

To browse the settings for the selected CLUT, click the Rendering transfer function PIC button. The panel displaying the visualization transfer function graph will appear at the bottom of the study window (see the example in Fig. 2.34).



You cannot change the setup parameters for predefined CLUTs.

Intensity will be displayed on the horizontal axis, while the number of points with a particular intensity will be shown on the vertical axis (blue line). The default scale may not allow you to see the intensity distribution graph (blue) at once. To change the horizontal axis scale, move the scroll under the axis, or roll the mouse wheel while the cursor is located on the scrollbar. The scale value will be displayed on the right of the scrollbar. To change the vertical axis scale, roll the mouse wheel while the cursor is located on the visualization setup panel, but not on the scrollbar. Fig. 2.35 shows the same graph as in the previous figure, but with a greater intensity distribution scale (on the vertical axis).



The color/transparency chart (white line) is superimposed on the intensity distribution scale. The horizontal axis shows the intensity, and the vertical axis shows the transparency of the color highlighting the points with this intensity. The color is displayed below the graph. The horizontal axis scale changes for both graphs simultaneously, while the vertical axis scale for the color/transparency chart does not change. To move the graph along the horizontal axis, hold the left mouse button.

To find out what percentage of tissue has a density in a given range, click on the Histogram percentage PIC button, move the cursor to the beginning of the range and move the cursor to the end of the range holding the left mouse button. The percentage of tissue that have a density within the range is indicated in red (fig. 2.36). To edit a range move the cursor to its border and move the border with the left mouse button pressed. To move a range move the cursor on it so that the cursor would look as follows PIC , and move the cursor holding the left mouse button. Multiple ranges can be built at the same time. To remove the built ranges click the Histogram percentage button again.

To export data on the distribution of densities click on the PIC button, in the dialog that opens specify the file name and folder, click Save to finish or Cancel for cancel.



2.17.4 Create and Edit CLUT

To create your own CLUT:

  1. Click the CLUTs PIC button to open the CLUT setup panel.
  2. Copy one of the existing CLUTs by selecting it from the list and clicking on the Add a new CLUT as a copy of the current one PIC button.
  3. To rename a CLUT, double-click the left mouse button on it, enter the new name and press the Enter key.
  4. Specify the required parameters:
    • Color. Select a point on the color/transparency chart. The color settings for this point will become available. To set up color of the current point for all points of the chart, click the Apply to all chart points PIC button.
    • Density. Sets the position of the point on the horizontal axis. The alternative way to set this parameter is to move the point along the horizontal axis using the mouse.
    • Opacity. Sets the transparency of the color. 1 — maximum, 0 — minimum. The alternative way to set this parameter is to move the point along the vertical axis using the mouse.
  5. To add a point, locate the cursor on the graph so that it looks like PIC , right-click the mouse and select the Add point item.
  6. To delete a point, locate the cursor on the point so that it looks like PIC , right-click the mouse and select the Remove point item.
  7. To restore the original settings for this CLUT, click the Reset the selected CLUT to its original state PIC button.

To delete a CLUT, click the Remove the selected CLUT/group PIC button.

Viewer allows you to add additional color/transparency charts. To add:

  1. Click the Add chart PIC button. New chart will appear on the bottom part of the window and its name will be added to the drop-down chart menu. The opened menu is shown in Fig. 2.37.
  2. To rename the selected chart, click the Edit chart name PIC button, type new name and press Enter.
  3. To delete the selected chart, click the Remove chart PIC button.
  4. To move the all charts along the horizontal axis, locate the cursor not on the any chart and move its holdind the left mouse button.
  5. To move any chart, select Auto detection from the drop-down chart menu, locate the cursor on the some chart and move it holdind the left mouse button.
  6. To move a certain chart, select its name from the drop-down chart menu, locate the cursor on this chart and move it holdind the left mouse button. This mode is useful, if the charts overlap.

If the chats overlap, the colors are mixed.