SmartDR Gain Calibration

Gain calibrations reduce the variations in a clinical setting produced by the variety of x-ray machines, tables, and other components of the install.

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.

NOTE: USE THE KVP/MA SETTINGS OBTAINED FROM VIVA WHEN SHOOTING IN SMART DR

Part 1: Close Sound Smart DR

1. Set LogOff to False

-Select the settings button to access the Management Screen button_settings

-From the Config Menu select Advanced Options 

SDR Config Advanced

 

-Change Log off admin on exit: to False         

menu_logoff_false

 

 

 

– Click the Save Button_Save button

– Click the logoff  button_key  button to shut down Smart DR

2. Ensure the following

  • Plate is centered
  • Plate is secured
  • Plate is cleared of any objects
  • Plate is clean
  • Collimator covers the full plate
  • Table top is replaced

Part 2: ViVA 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)

  • 4343 (1700) – 62kvp / 2.5 mAs
  • 4335 (1700) – 64 kvp / 5 mAs

4. Click the ViVA  icon_viva  icon on the desktop to open ViVA

– In the top right, ViVA will say No Acquisition Link to start

Viva_no_plate_load

– When the plate loads, it will have a series of numbers and letters

Viva_plate_load

5. With your collimator completely open, click the Acquire  button_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

viva_AcqInProgress

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.

Viva pre gain

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:

  • 4343 v2 (1700) w All-In-One Computer: 10,000 – 15,000
  • 4336 (1417): 6000 – 8000

Older versions of the Varian 1700 panel may calibrate different. Please contact tech support if you have a different panel/computer than listed above.

800-819-5538

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.

menu_viva gain cal

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_viva 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_viva finish final button. The status box will read “Gain Calibration is Done.” Note the Gain Median number in the Calibration Statistics.

viva_gain median

 

Click the Close button_viva close  button

11. Click the Acquire  button_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.

gain cal normal

12. Close ViVA with the Red ‘X’  button_viva x in the upper right corner

13. Re-open SmartDR  icon_smart dr  by double clicking on the icon and proceed to the steps below for calibrating in Sound Smart DR.

Part 3: Sound Smart DR Calibration

Before calibrating your plate in SmartDR, please ensure that the following has been completed:

  • Plate is centered and locked to tube stand
  • You have done a 4 shot calibration in Viva
  • USE THE SETTINGS YOU CALIBRATED WITH IN VIVA: DO NOT CHANGE YOUR  TECHNIQUE

1.  Select Calib  button_cailb from the menu on the left side of the screen

2. IGNORE THE INSTRUCTIONS on the screen. Follow the steps below

  • Set SID to 40″
  • Open collimator blades and ensure that the panel is fully illuminated
  • Ensure that there is nothing in the beam path
  • Set KVP and MAS to the settings used in Viva

3. Click the Start button_play 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 button_close at the right of the status bar

9. To exit the settings menu click the Back  button_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.