Vascular Imager

There are two separate sets of Matrox drivers - choose carefully based on your Imager version:

• For Imager version 6.0 and above, contact MIA support.
• For Imager version 5.6 and above.
• For Imager version 5.5 and below.

Contact MIA for support.

1. After starting Vascular Imager, the following error message is shown:
   Solution: Only one Vascular Imager can be invoked at any given time. Because there is only one frame grabber board inside the computer, so it can serve only one instance of the Imager application.

2. Acquisition time or number of frames cannot be entered - a smaller number appears instead.
   Solution: The length of sequence exceeds the allowed limits or the memory space available. Decrease the length of the acquired image sequence to be below the limits specified in Section 11.2.3 in the User's Manual. If the numbers are below these limits, and other applications are running, stop the other applications, and re-enter the numbers again.

3. The Imager appears to be hanging in the Trigger mode.
   Solution: In the trigger mode, the video display is updated ONLY upon the arrival of a trigger signal - even the display is control by the trigger signal. If there is no incoming trigger signal, the imager is not hanging but rather waiting for the trigger signal to come. To trouble shoot the lack of trigger signal (cabling problem, VCR problem, etc.), you may switch the acquisition mode, from Triggered back to the Timed mode to have the regular video display and check on the trigger signal path.

4. EKG-gated triggering is too frequent and acquires image frames between R-waves – too frequent triggering.
   Solution: Triggering signal is incorrect. This may be caused by the signal itself (contact your EKG system technician) or by the incorrect (too high) voltage level of the triggering signal at the digitization board triggering input. In the latter case, adjust (decrease) the gain of the hardware Vascular EKG Gating Module to achieve correct triggering. See also Chapter 12 in the User's Manual.

5. EKG-gated triggering is not frequent enough and triggered image acquisition skips cardiac cycles – too infrequent triggering.
   Solution: Triggering signal is incorrect. This may be caused by the signal itself (contact your EKG system technician) or by the incorrect (too low) voltage level of the triggering signal at the digitization boar triggering input. In the latter case, adjust (increase) the gain of the hardware Vascular EKG Gating Module to achieve correct triggering. See also Chapter 12 in the User's Manual.

6. Vascular EKG Gating Module does not provide correct gating data while it functioned properly in the past.
   Solution: Check the battery of the Vascular EKG Gating Module (red control light on) and replace if necessary. Adjust the gain otherwise. See also Chapter 12 in the User's Manual.

7. Vascular Imager is not responding after clicking "Save" in the saving window and before the study information window pops up.
   Solution: This is normal, the application is not crashing. Saving the acquired image data takes time. The length is dependent on the computer speed and the number of frames acquired.

8. Vascular Imager sometimes requires more time than specified to acquire an image frame.
   Solution: Image acquisition is a very demanding application. To maximize the performance, do not run any other Windows application during image acquisition. The computer used for image acquisition should not be connected to any network during frame grabbing. See Section 11.3.1 in the User's Manual.

9. Vascular Imager does not let me save long image sequences despite the fact that I have sufficient amount of RAM memory installed.
   Solution: Please, check your operating system. You must be running Windows NT, 2000, or XP to be able to handle large-size reliably. Windows 95/98?Me operating system was not designed to deal with files that are larger than several tens of megabytes. If you are running Windows 95, 98 or Me, upgrade to Windows NT, Windows 2000 or Windows XP.

10. When using triggered acquisition, some triggers are missed.
    Solution: Make sure the duplicate-triggering option is configured correctly. See Section 11.3.8 in the User's Manual.

11. Sometimes while exiting the Vascular Imager application, there may be error messages displayed. The error messages are entitled MIL DLL Message or Native MIL Error.

Solution: Those error messages can be safely ignored, by clicking on the Cancel or No button on the pop-up. The errors do not affect the behavior of the Vascular Imager or its image acquisition. The errors are coming from the hardware frame grabber board due to the hand-shaking of the exiting.