Comparison of clinical and physical measures of image quality in chest and pelvis computed radiography at different tube voltages

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Sandborg, MichaelLinköpings universitet,Medicinsk radiofysik,Hälsouniversitetet (författare)

Comparison of clinical and physical measures of image quality in chest and pelvis computed radiography at different tube voltages

Artikel/kapitelEngelska2006

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2006-10-18
Wiley,2006

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LIBRIS-ID:oai:lup.lub.lu.se:dacc12c4-f807-4b39-8161-20294d2dfb5c
https://lup.lub.lu.se/record/685772URI
https://doi.org/10.1118/1.2362871DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-13220URI

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Språk:engelska
Sammanfattning på:engelska

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The aim of this work was to study the dependence of image quality in digital chest and pelvis radiography on tube voltage, and to explore correlations between clinical and physical measures of image quality. The effect on image quality of tube voltage in these two examinations was assessed using two methods. The first method relies on radiologists' observations of images of an anthropomorphic phantom, and the second method was based on computer modeling of the imaging system 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 the same effective dose was achieved for each projection. Two x-ray units were employed using a computed radiography (CR) image detector with standard tube filtration and antiscatter 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 a Monte Carlo computer model in terms of the signal-to-noise ratio, SNR, of anatomical structures corresponding to the image criteria. Both the VGAS (visual grading analysis score) and SNR decrease with increasing tube voltage in both chest PA and pelvis AP examinations, indicating superior performance if lower tube voltages are employed. Hence, 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 analog screen-film radiography are discussed, as well as the relevance of using VGAS and quantum-noise SNR as measures of image quality in pelvis and chest radiography.

Ämnesord och genrebeteckningar

NATURVETENSKAP Biologi Biofysik hsv//swe
NATURAL SCIENCES Biological Sciences Biophysics hsv//eng
chest radiography
signal-to-noise ratio
visual grading analysis
tube voltage
image quality
effective dose
pelvis radiography
computed
radiography
diagnostic radiography
MEDICINE

Biuppslag (personer, institutioner, konferenser, titlar ...)

Tingberg, AndersLund University,Lunds universitet,Medicinsk strålningsfysik, Malmö,Forskargrupper vid Lunds universitet,Medical Radiation Physics, Malmö,Lund University Research Groups,Department of Radiation Physics, Malmö University Hospital, Malmö, Sweden(Swepub:lu)rfa-ati (författare)
Ullman, GustafLinköpings universitet,Medicinsk radiofysik,Hälsouniversitetet(Swepub:liu)gusul07 (författare)
Dance, David R.Joint Department of Physics, The Royal Marsden NHS Trust and Institute of Cancer Research, London (författare)
Alm Carlsson, GudrunLinköpings universitet,Medicinsk radiofysik,Hälsouniversitetet(Swepub:liu)gudal03 (författare)
Linköpings universitetMedicinsk radiofysik (creator_code:org_t)

Sammanhörande titlar

Ingår i:Medical Physics: Wiley33:11, s. 4169-41750094-2405

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Av författaren/redakt...: Sandborg, Michae ...; Tingberg, Anders; Ullman, Gustaf; Dance, David R.; Alm Carlsson, Gu ...

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NATURVETENSKAP: NATURVETENSKAP; och Biologi; och Biofysik

Artiklar i publikationen: Medical Physics

Av lärosätet: Lunds universitet; Linköpings universitet

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