X Ray Image Brightness. The brightness of an x ray video image during fluorography is maintained at a substantially constant level by a control circuit which varies the x ray dose in relation to changes in the average brightness of the x ray image. This can be on film or on stimulable phosphor plates or some digital media for digital radiography.
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As the x ray system approaches the limits of its imaging capability varying the x ray dose alone may not yield the desired brightness level. The incoming x ray photons that are transmitted create areas of less brightness or high density on the displayed image. Abstract image enhancement techniques have been widely used in many fields especially in medical scope where the subjective quality of images is important for human interpretation diagnosis.
The contrast between air soft tissue and bones in x ray and ct images is based on their different absorption of x rays.
As the x ray system approaches the limits of its imaging capability varying the x ray dose alone may not yield the desired brightness level. Differences in tissue density thickness and changes of the x ray spectrum have consequences for image contrast image noise as well as patient dose. Also controlled by window level. The amount of blackness on a given area of a radiographic image brightness density is directly controlled by mas mas controls the current through the x ray tube and consequently the number of x rays produced at the anode.
