What does ‘cts’ mean? (The unit)

Q: What does ‘cts’ mean? (The unit)

cts (Dark Noise) - “Numerical value” of pixel noise standard deviation of an image without X-ray cts (Offset (Black image)) - average “Numerical value” of an image without X-ray cts (Sensitivity at G=1) - “Numerical value” of pixel value when 1uGy X-ray dose reaches the detector surface under GAIN Type 1

cts (Dark Noise)
– “Numerical value” of pixel noise standard deviation of an image without X-ray

cts (Offset (Black image))
– average “Numerical value” of an image without X-ray

cts (Sensitivity at G=1)
– “Numerical value” of pixel value when 1uGy X-ray dose reaches the detector surface under GAIN Type 1