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Technical Artifacts and Errors. Chapter 11. Artifacts. Anything that decreases the quality of the radiograph resulting in difficult evaluation and interpretation. Problems with artifacts: Increases unnecessary re-takes May cause misdiagnosis. Consistent Artifacts.
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Technical Artifacts and Errors Chapter 11
Artifacts • Anything that decreases the quality of the radiograph resulting in difficult evaluation and interpretation. • Problems with artifacts: • Increases unnecessary re-takes • May cause misdiagnosis
Consistent Artifacts • If artifact is appearing consistently, cassette should be identified and thoroughly cleaned inside and out. • If fault is persistent should be labeled as faulty and put out of use.
Common Artifacts and Causes • Film too Dark • Too much kVp • Too much developer time • Over-measurement • Machine not calibrated • SID not correct for grid use
Artifacts continued • Film too light • Underexposure, need to increase kVp or mAs. • Underdeveloped • X-ray tube failure • Incorrect screen-film combination • Out of calibration
Artifacts Continued • Film gray/Lack of Contrast • Too much kVp • Radiation fog due to exposure film • Light leak in darkroom • Film Storage issues • Exhausted chemical issues • Out of date film • Lack of grid with use of high kVp’s • Double exposure • Too high of wattage in safelight
Artifacts continued • Lack of Detail • Increased object-film distance • Blurring due to poor screen-film contact • Blurring due to patient motion • Blurring due to x-ray tube motion • Distorted image due to central x-ray not directed at center of film • Double exposure
Artifacts Continued • Heavy Lines on Radiograph • Grid lines due to inappropriate use of grid • Roller marks from processor issues • Inconsistent film density • Collimation of primary beam • Bucky tray not positioned correctly • Light leak into cassette • Target damage
Artifacts continued • Black marks • Crimping or folding of film • Two films sticking together during development • Static Electricity • Developer on film before processing
Artifacts continued • Clear areas on film • Hair in cassette • Scratch in film emulsion • Line de to scratch on screen surface • Air bubble in film • Contrast medium on cassette or table • Film touching side of tank during manual processing.
Artifacts continued • Yellow Radiograph • Fixer splashes on film before developing • Premature age due to improper fixation • Film sticking together during fixing process • Incomplete washing.
