Comparison of clinical and physical measures of image quality in chest PA and pelvis AP views at varying tube voltages

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Ullman, GustavLinköpings universitet,Radiofysik,Hälsouniversitetet (författare)

Comparison of clinical and physical measures of image quality in chest PA and pelvis AP views at varying tube voltages

BokEngelska2004

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Linköping :Linköping University Electronic Press,2004
11 s.
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LIBRIS-ID:oai:DiVA.org:liu-57862
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57862URI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:rap swepub-publicationtype

Serie

Report / Institutionen för radiofysik, Universitetet i Linköping, 1998- ;98

Anmärkningar

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.

Ämnesord och genrebeteckningar

MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Radiologi och bildbehandling hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Radiology, Nuclear Medicine and Medical Imaging hsv//eng
image quality
effective dose
tube voltage
visual grading analysis
signal-to-noise ratio
chest radiography
pelvis radiography
computed radiography
Radiological physics
Radiofysik

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

Sandborg, MichaelÖstergötlands Läns Landsting,Linköpings universitet,Radiofysik,Hälsouniversitetet,Radiofysikavdelningen(Swepub:liu)micsa02 (författare)
Tingberg, AndersDepartment of Radiation Physics, Malmö University Hospital, Sweden (författare)
Dance, David RDepartment of Physics, The Royal Marsden NHS Trust, UK (författare)
Hunt, RogerDepartment of Physics, The Royal Marsden NHS Trust, UK (författare)
Alm Carlsson, GudrunÖstergötlands Läns Landsting,Linköpings universitet,Radiofysik,Hälsouniversitetet,Radiofysikavdelningen(Swepub:liu)gudal03 (författare)
Linköpings universitetRadiofysik (creator_code:org_t)

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

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MEDICIN OCH HÄLSOVETENSKAP: MEDICIN OCH HÄLS ...; och Klinisk medicin; och Radiologi och bi ...

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Av lärosätet: Linköpings universitet

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