Quality assurance: using the exposure index and the deviation index to monitor radiation exposure for portable chest radiographs in neonates
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Many methods are used to track patient exposure during acquisition of plain film radiographs. A uniform international standard would aid this process.
To evaluate and describe a new, simple quality-assurance method for monitoring patient exposure. This method uses the “exposure index” and the “deviation index,” recently developed by the International Electrotechnical Commission (IEC) and American Association of Physicists in Medicine (AAPM). The deviation index measures variation from an ideal target exposure index value. Our objective was to determine whether the exposure index and the deviation index can be used to monitor and control exposure drift over time.
Materials and methods
Our Agfa workstation automatically keeps a record of the exposure index for every patient. The exposure index and deviation index were calculated on 1,884 consecutive neonatal chest images. Exposure of a neonatal chest phantom was performed as a control.
Acquisition of the exposure index and calculation of the deviation index was easily achieved. The weekly mean exposure index of the phantom and the patients was stable and showed <10% change during the study, indicating no exposure drift during the study period.
The exposure index is an excellent tool to monitor the consistency of patient exposures. It does not indicate the exposure value used, but is an index to track compliance with a pre-determined target exposure.
KeywordsExposure index Deviation index Radiation safety Neonate
Conflict of interest
Quality Assurance: Using the Exposure Index and the Deviation Index to Monitor Radiation Exposure for Portable Chest Radiographs in Neonates
Mervyn Cohen has a conflict of interest. He received $2000.00 from Agfa to support the study.
Bruce Apgar works for Agfa corporation. He provided help with data collection and analysis
- 5.International commission on radiological protection (2004) Managing patient dose in digital radiology: a report of the International Commission on Radiological Protection. Ann ICRP 34:1–73Google Scholar
- 8.(2008) Medical electrical equipment—exposure index of digital X-ray imaging systems. Part 1: definitions and requirements for general radiography, International Electrotechnical Commission (IEC), international standard IEC 62494-1:2008-08 Geneva, SwitzerlandGoogle Scholar