chulheelee-hub / x-ray

X-ray knowledge cafe
0 stars 0 forks source link

How many calibration points and what values should be done to obtain the best result? #5

Open chulheelee-hub opened 2 years ago

chulheelee-hub commented 2 years ago

In the manual calibration, how many calibration points?, how many shots per calibration ? and what values are the recommended to obtain the best result?

chulheelee-hub commented 2 years ago
  1. Whenever you get a bright image, there is a difference: it is resolved by repetition & averaging.

  2. Remove default energy: Dark frame required.

  3. S/N Ratio, that is, the CAL point is important for low doses with a low signal-to-noise ratio. This is an image

  4. The difference according to temperature: Calibration is necessary after sufficient aging.

  5. With temperature calibration, it is possible to have good characteristics in the temperature difference.

  6. When calibrating, be sure not to be nourished by static electricity, magnetic field, EMI, and shock & vibration.

For calibration points and shots per calibration, if the customer environment is not linear and the variance per shot is severe, many CAL points and multi shots are required.

  1. If the characteristics of the customer-generator are not linear: 5 or more CAL points are required.
  2. When LSB difference occurs every time: 4 or more shots are required. Also, if AED, Manual CAL file, and Dark file are mixed, the following issues will occur. This is an image