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A lead L or R placed in the beam before exposure.
Also known as: Anatomical marker, Side marker radiography
A lead letter is placed in the X-ray beam so that left and right are recorded in the image itself rather than added afterwards. Adding the marker digitally after exposure is prohibited in most protocols precisely because a mistake would then be undetectable.
Records which side of the patient is imaged, as a lead letter placed in the beam before exposure.
Contexts: Medicine
Is placed physically rather than added afterwards, because a digitally applied marker could be wrong with no way to detect it from the image.
Contexts: Medicine
A single capital letter in dense metal appearing as a bright shape at the edge of a radiographic image.