Quality Assurance in Transfusion Science
Q: What does the term 'hemovigilance' refer to in transfusion medicine?
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True. **Photographic superimposition** (or video superimposition) is a forensic technique used primarily in anthropology and odontology to aid in the identification of skeletal remains, particularly a skull. The method involves taking a photograph of the skull in the same orientation (frontal, lateral) as an antemortem photograph of a suspected individual. The two images are then superimposed, either optically using specialized equipment or digitally using software. The examiner aligns fixed anatomical landmarks that do not change significantly with soft tissue, such as the outer corner of the eye orbit (ectocanthus), the bridge of the nose, the chin, and the auditory meatus (ear opening). If the skull's features align consistently with the facial features in the photograph across multiple points, it supports the possibility of a match. It is typically considered a method of **corroboration** or **exclusion** rather than positive identification on its own, and is often used in conjunction with other methods like dental records or DNA.
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