Gain calibrations reduce the variations in a clinical setting produced by the variety of x-ray machines, tables, and other components of the install.
NOTE: USE THE KVP/MA SETTINGS OBTAINED FROM VIVA WHEN SHOOTING IN SMART DR
Depending on the type of panel you have, your Viva gain calibration will be different. Please choose whether you have an Auto Exposure Detection (AED) panel or if you have a generator integrated panel that uses a UIO Box.
Auto Exposure Detection Panels
Generator Interfaced – UIOv3 Panels
1. Set LogOff to False
-Select the settings button to access the Management Screen
-From the Config Menu select Advanced Options
-Change Log off admin on exit: to False
– Click the Save button
– Click the logoff button to shut down Smart DR
2. Ensure the following
1. Launch the ViVA application
2. Set the mode dropdown to VTRIG_1000ms_2pF
3. Set the X-Ray Generator Technique:
4. Click “Acquire Image”
5. Check the “Hardware-Handshaking” box
6. Click “Start Acquisition”
7. Acquire a flat image to check technique
ALWAYS CENTER and ALIGN the panel prior to calibrating, then put the table top BACK ON before getting “Img Stats” ROI numbers in step 8!
8. Click “Img Stats”
9. Average of Pixel Values in ROI should be between 10000 – 15000:
10. Close the “Img Stats” window
11. Click Acquisition > Gain Calibration
12. Click OK under Calibration Settings for 8 images
13. The detector will begin acquiring a series of offset images (8 total). The progress window
14. Once the offset images have been acquired and stored to the panel, the progress
window will display flat-field 0, started, press hand-switch… and then scroll “waiting”
repeatedly. Acquire gain image 1 of 8
15. Once the progress window displays received gain image 1 of 8, flat-field 1, press handswitch
– acquire gain image 2.
16. Repeat step 15 until all 8 gain images have been acquired. Once the files have been
updated on the detector, the progress window will display “successfully finished
calibration”. Close the Gain Calibration window.
17. There is no need to perform an additional gain calibration in the SmartDR software.
Smart DR utilizes 2 programs to complete the gain calibration. The first is Viva, which allows us to adjust to the technique to obtain the correct settings. Viva also gives us the opportunity to check our plate for any inconsistencies. After a 3-shot calibration has been performed in Viva, continue to the Smart DR software to complete another 8-shot gain calibration.
3. Set the X-ray collimation to wide open and use the appropriate technique to start your calibration (techniques will vary based on x-ray machine)
4. Click the ViVA icon on the desktop to open ViVA
– In the top right, ViVA will say No Acquisition Link to start
– When the plate loads, it will have a series of numbers and letters
5. With your collimator completely open, click the Acquire button or press F5 to ready your plate for exposure. The ViVA status bar will read “HardwareHandshaking acquisition in progress…” when the plate is ready for exposure
6. With your technique set appropriately, fire an x-ray.
7. An image will appear on the screen similar to the one below. Ensure that there is no objects, etc in the x-ray field below and that the entire plate is covered. If you have any regularities, remove them and repeat steps 5 & 6.
8. Click the Image Stats button to estimate your final gain calibration number. Box 11, Average of Pixel Values in ROI should fall between the following numbers for your install:
Older versions of the Varian 1700 panel may calibrate different. Please contact tech support if you have a different panel/computer than listed above.
If your average value is off, please adjust appropriately and repeat steps 5 & 6.
9. From the Acquisition menu, select Gain Calibration or press F4 to start your Gain Calibration. This will be a 4 shot gain calibration.
10. The gain calibration will do a quick offset.Take an X-ray when the status box displays “X-ray exposure in progress… Frame count:1.”
NOTE: This message indicates that the plate is ready for exposure. You will you will activate the x-ray machine by pressing the Sound foot switch.
11. After the shot, the status box will read “Click the ‘Finish’ button or initiate next exposure(#2). Wait until the Finish button grays out and fire again. Repeat this until you have reached 4 shots.
12. At the end of 4 shots, press the Finish button. The status box will read “Gain Calibration is Done.” Note the Gain Median number in the Calibration Statistics.
Click the Close button
11. Click the Acquire button or press F5 and take another exposure at the same technique. Your image should show as a “milky, uniform gray.” If you see any regularities check for any objects in the plate, collimator, etc and redo your gain calibration.
12. Close ViVA with the Red ‘X’ in the upper right corner
13. Re-open SmartDR by double clicking on the icon and proceed to the steps below for calibrating in Sound Smart DR.
Before calibrating your plate in SmartDR, please ensure that the following has been completed:
1. Select Calib from the menu on the left side of the screen
2. IGNORE THE INSTRUCTIONS on the screen. Follow the steps below
3. Click the Start button when it appears below the Current Status window.
4. Your panel will take several moments to prepare. The Instructions section will provide updates
5. Take your first shot when the Instructions show you the kvp, mas, and SID to fire. IGNORE the kVp, mAs, and SID settings. Use the previous settings from your Viva calibration (i.e. for a 4343, kVp start around 54 kVp and 2.5 mAs)
6. Your Instructions status will change after your shot to “Performing Calculations, please stand by…” When your system is ready for the next shot, the insructions will read “1. Set kVp to: 70, etc….” and your Current Status will read what shot number you are on. Take your next shot.
7. After 8 shots, the SmartDR status will read Calibration Successful
8. Click Close at the right of the status bar
9. To exit the settings menu click the Back button
10. RESTART SYSTEM AFTER CALIBRATION. If you do not restart your system, you will not be able to take an x-ray in the acquisition screen.
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