Differences in effective dose estimation from dose-area product and entrance surface dose measurements in intravenous urography
| Autor: | E Yakoumakis, Ioannis A. Tsalafoutas, I Nazos, D Nikolaou, Ch. Proukakis, E D Koulentianos |
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| Rok vydání: | 2001 |
| Předmět: |
Adult
Male business.industry Phantoms Imaging Intravenous urography Dose profile Urography General Medicine Radiation Dosage Effective dose (radiation) Imaging phantom Radiation risk Dose area product Conversion coefficients Calibration Medicine Humans Radiology Nuclear Medicine and imaging Female Nuclear medicine business Radiometry Exposure data Skin |
| Zdroj: | The British journal of radiology. 74(884) |
| ISSN: | 0007-1285 |
| Popis: | In this study, measurements of dose-area product (DAP) and entrance surface dose (ESD) were carried out in a sample of 25 adult patients who underwent intravenous urography (IVU). These measured quantities were used to estimate the effective dose E from the IVU examination, a quantity closely correlated to radiation risk. Estimating E involves the use of conversion coefficients that have been determined for specific X-ray views in a mathematical phantom. These are obtained under conditions which are not usually met in clinical practice. As a result, the E estimates using the two different measurable quantities can be quite different. Analysis of the calculation procedure suggests that the E estimate using the DAP measurements, in addition to being more practical, could be more accurate than using ESD measurements, as DAP is sensitive to the X-ray field size settings. Furthermore, it is shown that in the absence of the appropriate equipment, a reliable E estimate can be obtained from the ESD calculated using the exposure data for each X-ray view. |
| Databáze: | OpenAIRE |
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