The Radiologist’s Role in Radiation Exposure during Chest Computed Tomography
Stochastic somatic and genetic effects of ionising radiation exposure are recognised to be biologically significant. Effective dose is the single best parameter to estimate the biologic impact. Depending on the geographic location, natural population exposure in central Europe is estimated to be around 3 mSv/year and medical exposure 1–1.5 mSv/year (Table 1). More important, the relative contribution of 25–50% [1, 2, 3, 4] of CT to the medical exposure of the population is increasing due both to a still increasing number of studies and a decreasing contribution by non-computed tomography (CT) studies (caused by decreasing frequency and individual dose due to more and more pulsed fluoroscopy). Individual exposure through chest examinations has a wide range between around 0.05 mSv for a single posteroanterior chest radiograph and more than 20 mSv for cardiac intervention (Table 2). CT is characterised by an extraordinary medical usefulness but also a relatively high individual exposure. This fact makes it important both for the medical doctor requesting a study and the radiologist performing it to be aware of the exposure, to check for alternatives without ionising radiation and to reduce exposure during CT studies to the very minimum needed medically.
KeywordsEffective Dose Chest Compute Tomography Medical Exposure Organ Dose Spiral Scanning
Unable to display preview. Download preview PDF.
- 1.Jung H (1995) Strahlenrisiko: widersprüchliche angaben verunsichern öffentlichkeit und patienten. Deutsche Röntgengesellschaft: Informationen 3Google Scholar
- 2.Shrimpton PC, Wall BF (1995) The increasing importance of X-ray computed tomography as a source of medical exposure. Radiat Prot Dosim 57: 413–415Google Scholar
- 4.Dixon A (ed) (1998) RCR Guidelines Working Party, 4th edn. Making the best use of a Department of Clinical Radiology. Royal College of Radiologists, p 14Google Scholar
- 9.Jones DG, Shrimpton PC (1991) Survey of CT practice in the UK. Part 3: normalised organ doses calculated using Monte Carlo techniques (NRPB-R250). National Radiological Protection Board, Chilton, UKGoogle Scholar
- 15.Schöpf UO, Becker CR, Bruening RD, Huber AM, Hong C, Reiser MF (1999) Multidetector-array spiral CT imaging of focal and diffuse lung disease: thin-collimation data acquisition with reconstruction of contiguous and HRCT sections. Radiology 213 (P): 259Google Scholar