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Comparison of clinical and physical measures of image quality in chest PA and pelvis AP views at varying tube voltages
Linköpings universitet, Institutionen för medicin och vård, Radiofysik. Linköpings universitet, Hälsouniversitetet.
Linköpings universitet, Institutionen för medicin och vård, Radiofysik. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Kirurgi- och onkologicentrum, Radiofysikavdelningen.ORCID-id: 0000-0003-3352-8330
Department of Radiation Physics, Malmö University Hospital, Sweden.
Department of Physics, The Royal Marsden NHS Trust, UK.
Vise andre og tillknytning
2004 (engelsk)Rapport (Annet vitenskapelig)
Abstract [en]

Image quality in digital chest PA and pelvis AP was assessed using two different methods; one based on observations of images of an anthropomorphic phantom, one based on computer modelling using an anthropomorphic voxel phantom. The tube voltage was varied within a broad range (50-150 kV), including those values typically used with screen-film radiography. The tube charge was altered so that approximately the same effective dose was achieved in the modelled patient (anthropomorphic phantom). Two x-ray units were employed using a digital image detector (computed radiography, CR, system) with standard tube filtration and anti-scatter device. Clinical image quality was assessed by a group of radiologists using a visual grading analysis (VGA) technique based on the revised CEC image criteria. Physical image quality was derived from the computer model in terms of the signal-to-noise ratio, SNR for fixed effective dose in the voxel phantom. The computer model uses Monte Carlo simulations of the patient and complete imaging system. Both the VGAS (visual grading analysis score) and SNR increase with decreasing tube voltage in both chest PA and pelvis AP examinations, indicating superior performance if lower tube voltages than used today are employed in digital radiology. A positive correlation between clinical and physical measures of image quality was found. The pros and cons of using lower tube voltages with CR digital radiography than typically used in analogue screen-film radiography are discussed as well as the relevance of using VGAS and quantum noise SNR as measures of image quality.

sted, utgiver, år, opplag, sider
Linköping: Linköping University Electronic Press , 2004. , s. 11
Serie
Report / Institutionen för radiofysik, Universitetet i Linköping, 1998- ; 98
Emneord [en]
image quality, effective dose, tube voltage, visual grading analysis, signal-to-noise ratio, chest radiography, pelvis radiography, computed radiography
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-57862ISRN: LIU-RAD-R-098OAI: oai:DiVA.org:liu-57862DiVA, id: diva2:328154
Tilgjengelig fra: 2010-07-01 Laget: 2010-07-01 Sist oppdatert: 2015-03-20bibliografisk kontrollert

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Comparison of clinical and physical measures of image quality in chest PA and pelvis AP views at varying tube voltages(296 kB)1516 nedlastinger
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