Foreshortening
A geometric distortion in intraoral radiography in which a tooth's image appears shorter than its true anatomical length, caused by excessive vertical angulation of the X-ray beam.
Full Definition
Foreshortening occurs when the X-ray beam is directed too steeply downward relative to the bisecting angle of the tooth-receptor assembly, compressing the projected image. It is the counterpart to elongation and is among the most frequently noted projection errors in dental radiology quality assurance reviews. Foreshortening can mask periapical pathology by superimposing root structure and shortening the visible root length. Editors proofreading radiographic technique assessments must distinguish foreshortening from elongation and from cone cutting. The word is written as a single unhyphenated term and is always lower case except at sentence starts.
Usage
Usage note: One unhyphenated word. Contrast explicitly with 'elongation' when both terms appear in the same document.
In Context
- "Foreshortening of the upper molar roots was attributed to excessive positive vertical angulation." — Radiographic quality audit report
- "The quality assurance checklist requires the reviewer to record foreshortening separately from cone cutting." — Radiology department QA form