Changing brightness / contrast

<< Click to Display Table of Contents >>

Navigation:  Basic Topics > Using basic tools >

Changing brightness / contrast

 

Click the  Adjust image window  button on the toolbar (or press the  W  key).

 

RadiAnt_DICOM_Viewer_Adjust_Window_Button

 

Next, press the left mouse button over the image and drag the mouse to change brightness (window level - WL), or contrast (window width - WW):

 

Up to decrease brightness (window level goes up)

Down to increase brightness (window level goes down)

 

Left to increase contrast (window width shrinks)

Right to decrease contrast (window width expands)

 

 

RadiAnt_DICOM_Viewer_Adjust_Window_Mouse_Moves

 

 

By default, the windowing tool is associated with the middle mouse button.

Press the  Ctrl  key and drag the mouse with the left button down, and the windowing tool will be active regardless of current association.

 

On multi-touch devices, touch the image with three fingers and drag them in the directions described above to adjust window level and width.

 

Window presets

 

Different window presets can be quickly applied by pressing  0  through  9  .

 

 0  Default window for the current image.

 1  Full dynamic window (pixel with lowest value is displayed as black, whereas pixel with the highest value is displayed as white).

 

 2  -  9  set different WL/WW depending on image modality. In the table below presets for CT images are shown.

 

Key

Preset

WL

WW

 2 

CT Abdomen

60

400

 3 

CT Angio

300

600

 4 

CT Bone

300

1500

 5 

CT Brain

40

80

 6 

CT Chest

40

400

 7 

CT Lungs

-400

1500

 

These presets are also available from the  Adjust image window  drop down menu.

 

RadiAnt_DICOM_Viewer_Adjust_Window_DropDownMenu

 

The preset values for PET (Positron Emission Tomography) series apply to the maximum value of the displayed range and are presented as the percent of the highest value in the entire image series.

 

Key

Displayed range maximum value (as % of the highest value in series)

 2 

0.5%

 3 

1%

 4 

2.5%

 5 

5%

 6 

10%

 7 

25%

 8 

50%

 9 

100%

 

RadiAnt_DICOM_Viewer_Adjust_Window_DropDownMenu_PET

 

Negative mode

 

Press the  F11  key or click the  Negative  menu item to toggle negative mode for the image.

 

RadiAnt_DICOM_Viewer_Negative_Mode_DropDownMenu

 

RadiAnt_DICOM_Viewer_Adjust_Window_Negative_Mode