Inobitec DICOM Viewer

2.22. DSA Mode

Using DSA mode you can process a series of frames with different concentration of a contrast agent, subtracting images in such a way that tissues, containing contrast, are best seen.

2.22.1 Single-image subtraction view

For studies containing a series of frames (images) with a varying concentration of a contrast agent, one of the images is subtracted from all images in the series. To apply the DSA mode:

  1. Open the study in the View Flat Images window.
  2. Click on the left side of the PIC button. The first image of the series has been subtracted from all the images of this series.
  3. Scroll through the images by moving the slider or rotating the mouse wheel, hovering the cursor over the scroll bar on the Frame Scroll Bar (Fig. 2.45).
  4. If you want to subtract another image from all the images, select this image using the scroll bar in the Frame Scroll Bar, click on the arrow on the right side of the PIC button and select the command Set the current frame as a key frame.
  5. If the series pictures are offset relative to each other, then correct it by selecting the command Auto adjust key image offset on the DSA mode tool menu.
  6. To manually correct the offset, select the command Manual Adjustment from the DSA Mode tool menu and change the location of the images using the buttons that appear in the image view window (Fig. 2.46) or using the PIC PIC PIC PIC keys.
  7. If necessary, change the window width and window level.





2.22.2 Series subtraction view

For studies containing at least two related series of frames (images) with different concentration of a contrast agent, images of the one series are subtracted from the corresponding images of another series. To apply the DSA mode:

  1. Open the study in the View Flat Images window.
  2. Choose a series whose images you want to subtract from the images of the other series.
  3. Click on the left side of the PIC button.
  4. Click on the arrow on the right side of the PIC button. If the study contains the necessary data, then the command Set the frame series as key frames is available. Select this command.
  5. Select another series of frames by rotating the mouse wheel or moving the slider on the right side of the image view window.
  6. Scroll through the images by moving the slider or rotating the mouse wheel, hovering the cursor over the scroll bar on the Frame Scroll Bar (Fig. 2.45).
  7. If necessary, change the window width and window level.

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