Artis Systems VD12: DSA Post-processing Control Room Video

This video explains the workflow for DSA post-processing on the control room user interface.
  • 0:28 Move Mask/Replace Mask
  • 2:10 Native Display
  • 2:45 Anatomical Background
  • 3:30 Pixel Shift
  • 5:30 Averaging
  • 6:24 Opacification

Welcome to the Artis DSA post processing video. In this video you will learn the workflow for DSA post processing on the control room user interface. You access the tools for DSA in the DSA subtests card in the Post Processing Task card. During DSA or road map, the mask is set automatically. If required, for example because of patient movement, you can change the automatically set mask. Setting a new mask can be done via move mask or replace mask depending on your user configuration. Either the replace mask icon or the move mask icon will be available in the DSA subtests card. To change the default setting, select options, move mask or replace mask in the main menu. With move mask you select the icon first, then select the image, select the Move mask icon, use the review controls to scroll through the images. Alternatively, you can click in the image area to scroll in the scene, click on the right of the image to scroll forwards, click on the left of the image to scroll backwards. When you reach the frame that you want to select as a mask, select the move mask icon again. If replace mask is configured first, scroll through the images frame by frame. When you reach the frame that you would like as the new mask, select the replace mask icon. The selected frame will be used as the mask. A DSA scene is normally displayed subtracted, however, each subtracted scene can also be displayed on subtractive that is native. Select the native icon in the DSA subtests card. You can also select native display by right clicking on the image. Select native from the context menu. You can adjust the anatomical background between 0% subtracted display and 100% native display. Select the anatomical background icon, the anatomical background slider appears. Select the icon to turn on off anatomical background. Enter a percentage value or adjust the slider to the desired level of anatomical background. Press the home icon to return to the default anatomical background settings. If the patient has moved the mask and the fill images of DSA may not correspond accurately. Using pixel shift you can align the mask and fill images. Select the Pixel shift icon. After selection of Pixel shift auto pixel Shift is automatically selected with auto pixel shift you define the region of interest that you want to optimize. The computer automatically calculates the best result. This result is applied to all subsequent frames in the scene. A square for the region of interest. ROI is drawn in the middle of the image. Drag the square icon to the region of interest. The mask is shifted to optimize subtraction for that region. If you are not satisfied with the result, you can make further adjustments with manual pixel shift. Select the manual pixel shift icon in the Pixel shift menu. Drag the image area to align the mask and the fill image. It is also possible to use the Arrow keys on your keyboard. Another option is flexibel pixel shift. Select the flexibel pixel shift icon. The mask image is divided into squares like on a chess board. The optimal pixel shift is automatically applied to each square. Please note the calculation may take a few seconds. The pixel shift calculation is applied to the current frame only. To store the result, save the image as a store monitor image. To reset the pixel, shift to zero, select the reset icon in the Pixel Shift menu, selecting the home icon restores the Pixel shift to the last saved values. Averaging can be used to improve the image by reducing noise. Select the averaging icon. Fill averaging is carried out in both directions. That is, the fill frames before and after the selected fill frame are added. Mask averaging is carried out in the forward direction that is the selected mask frame and the subsequent mask frames are added. For DSA scenes, it is recommended to perform both mask and fill averaging. Select the number of frames from the Phil averaging list. The higher the number of images used for averaging, the better the noise suppression. Select the number of frames from the mask averaging list. The calculation is carried out immediately and applied to the scene. Usually the contrast medium does not fill the vessels uniformly after injection. The contrast medium travels through the vessels. The opacification function combines the frames from the fill phase. The path taken by the contrast medium is displayed in one image. Scroll through to the frame in which the contrast medium is visible for the first time. Select the OPEC icon. Every frame from this point will be added to the OPEC image. Scroll through frame by frame the image with the maximum contrast filling is calculated. You can save the image as a reference image or restore monitor image. The OPAC function remains active until deactivated.

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