Digital Artifacts

Edge Enhancement High contrast and edge definition Lose fine detail on the edges of high contrast areas

Ghost Image

CR Ghost Images Ghost or memory artifacts occur when the radiation remains trapped in the phosphor plate. Remember, radiation can remain trapped for several minutes. CR plates must be correctly erased to prevent ghost images.

Collimation

CR Screen Artifacts

DR RF Noise

Quantum Mottle

Key Advantages of Envision’s CMOS Line Array Technology 6. Fill Factor The "fill factor" of a detector is the percentage of the surface area that is actually active, that is, capable of detecting photons. For example, where Envision's CMOS detector arrays have a fill factor in excess of 90%, the amorphous silicon detectors have a fill factor of only about 63%.  The higher the fill factor, the more sensitive the detector is. Main Menu

Dead Pixels Dead Pixels The number of known dead (nonfunctional) pixels and pixel aggregations was obtained from the system calibration table (bad-pixel mask). Calibration algorithms detect individual pixels, pixel clusters, and lines of contiguous pixels (rows or columns) that fail to produce a usable output value. In routine clinical use, a proprietary correction algorithm is applied to each image at the site of each nonfunctional pixel to fill in the missing image information on the basis of surrounding image information.

Light bulb Artifact

Printer Distortion Occurs when the image size and the printed size are not equal.

Moire Pattern Grid lines run in the same direction as the laser in the CR reader.