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Survey of posteroanterior chest radiography in The Netherlands: patient dose and image quality

¹ Interfaculty Reactor Institute Delft University of Technology, Mekelweg 15, 2629 JB Delft and ² Department of Radiology, Leiden University Medical Centre, Albinusdreef 2, 2333 ZA Leiden, The Netherlands

View larger version (19K): [in a new window]   Figure 1. Image quality parameter K as a function of the inverse of effective dose. The fits shown refer only to the conventional systems or only the Thoravision systems. The slopes and standard deviations are 4.3±2.4 and 1.7±4.4, for conventional and Thoravision systems, respectively, indicating that the slope is not significantly different from zero at the 95% confidence level.

View larger version (17K): [in a new window]   Figure 2. Image quality parameter K as a function of the half value layer (HVL) for conventional systems. The slope of the fit is not significantly different from zero (0.006±0.044).

View larger version (16K): [in a new window]   Figure 3. Effective dose as a function of half value layer (HVL). The fit refers to the conventional systems, including those with lung filters. The slope is significantly different from zero at the 95% confidence level (slope -1.9±0.6).