Managing contrast and brightness impression
Because fluoroscopy means live viewing, relevant diagnostic information in the images must be visible straightaway at the correct level of brightness and contrast. Furthermore, because the human eye is very sensitive to temporal variations, the contrast and brightness impression must be stable over time. This is particularly challenging in view of the rapid temporal variations occurring in fluoroscopy, particularly with respect to:
- The body region under examination, e.g. when examining the esophagus
- The field-of-view, e.g. when moving the patient or modifying the collimated area
- Areas of direct radiation
- The distribution of the contrast agent
- The dose level
When the dose level or the field-of-view is modified (e.g. by modifying its size, by shifting it from the body center to the periphery, or by moving the patient), Dynamic UNIQUE automatically determines the signal level in the anatomical region and maps it to an appropriate brightness level. Areas of direct radiation are reliably detected and excluded from the brightness adjustment. In contrast, simpler methods include areas of direct radiation in adjustments, resulting in dark images and obscured anatomy, as well as annoying flickering.
Optimal image stability for fluoroscopy and spot images at any time leads to comfortable viewing of high-quality images, less time needed to adapt to the luminosity, and ultimately, a smooth and efficient workflow.