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I am acquiring X-ray spectral images at resolution 512. Why do some frames take as little as 15 seconds to complete while others can take up to 30 seconds?

April 26, 2017frames images little resolution spectral X-ray

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I am acquiring X-ray spectral images at resolution 512. Why do some frames take as little as 15 seconds to complete while others can take up to 30 seconds?

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X-ray spectral imaging is dead time corrected. This means that every pixel gets equal live dwell time. This ensures that each pixel’s intensity is truly proportional to its corresponding X-ray intensity. Therefore, the real time required to acquire one frame depends on the percentage of dead time.