Document Detail


Radiation doses to patients undergoing standard radiographic examinations: a comparison between two methods.
MedLine Citation:
PMID:  16885174     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The objective of the study was to derive a mathematical method for calculating the entrance surface dose (ESD) from exposure factors for all tube potentials used in clinical practice and to compare the calculated ESDs (ESD(C)) with those measured (ESD(TLD)) using thermoluminescent dosemeters (TLDs). The exposure parameters of 43 patients who underwent (a) posteroanterior (PA) and lateral (LAT) chest examination (13 patients), (b) supine abdomen (10 patients), (c) erectus abdomen (10 patients), or (d) urinary tract examination (10 patients) were recorded. Patient ESD was directly measured by TLDs and calculated from exposure factors. The differences between ESD(C) and ESD(TLD) were quite small and could be explained by the uncertainties involved in both methods, in all but the PA chest examination where the ESD(C) was about 50% larger than ESD(TLD). However, in PA chest the ESD(TLD) was close to the minimum detectable dose of TLDs, questioning the accuracy of ESD(TLD). Further investigation showed that using the high tube potential technique (130 kV) in the PA chest examination resulted in very short exposure times, in the region of 4 ms. In such short exposure times, the X-ray generator operation presented stability problems that led to loss of output linearity and consequently to false calculation of ESD. The calculation method offers a reliable and cheap alternative to the measurement of ESD by TLD, provided that the exposure times are not as short as in the PA chest examinations recorded in this study, so that the output linearity with tube current-time product (mAs) is maintained.
Authors:
V Tsapaki; I A Tsalafoutas; I Chinofoti; A Karageorgi; E Carinou; V Kamenopoulou; E N Yakoumakis; E D Koulentianos
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2006-08-02
Journal Detail:
Title:  The British journal of radiology     Volume:  80     ISSN:  1748-880X     ISO Abbreviation:  Br J Radiol     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-05-14     Completed Date:  2007-06-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0373125     Medline TA:  Br J Radiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  107-12     Citation Subset:  AIM; IM    
Affiliation:
Medical Physics Unit, General Hospital Konstantopoulio-Agia Olga, Athens, Greece. virginia@otenet.gr
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MeSH Terms
Descriptor/Qualifier:
Body Weight
Humans
Quality Assurance, Health Care
Radiation Dosage*
Radiography / standards*
Radiology Department, Hospital / standards

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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