Mirror image artifact
Mirror image artifact in ultrasonography is seen when there is a highly reflective surface (e.g. diaphragm) in the path of the primary beam.
The primary beam reflects from such a surface (e.g. diaphragm) but instead of directly being received by the transducer, it encounters another structure (e.g. a nodular lesion) in its path and is reflected back to the highly reflective surface (e.g. diaphragm). It then again reflects back towards the transducer.
The ultrasound machine makes a false assumption that the returning echo has been reflected once and hence the delayed echos are judged as if being returned from a deeper structure, thus giving a mirror artifact on the other side of the reflective surface.
- 1. Abu-Zidan FM, Hefny AF, Corr P. Clinical ultrasound physics. J Emerg Trauma Shock. 2012;4 (4): 501-3. Free text at pubmed - Pubmed citation
- 2. Sandler MA, Madrazo BL, Walter R et-al. Ultrasound case of the day. Duplication artifact (mirror image artifact). Radiographics. 1988;7 (5): 1025-8. Pubmed citation