Distributions of scatter to primary ratios and signal to noise ratios per pixel in digital chest imaging

Ullman, GustafLinköpings universitet,Medicinsk radiofysik,Hälsouniversitetet (författare)

The aim of this work was to calculate distributions of scatter-to-primary ratios (s/p) and signal-to-noise ratios per pixel (SNRp) in chest images. Such distributions may provide useful information on how physical image quality (contrast, SNR) is distributed over the posterior/anterior (PA) chest image. A Monte Carlo computer program was used for the calculations, including a model of both the patient (voxel phantom) and the imaging system (X-ray tube, anti-scatter grid and image detector). The calculations were performed for three PA thicknesses 20, 24 and 28 cm. For a 24 cm patient, the s/p varies between 0.5 in the lung to 2.5 behind the spine and heart. The corresponding variation of the SNRp is a factor of 3, with the highest values in the lung. Increasing the patient thickness from 20 to 28 cm increases the s/p by a factor of 2.2 behind the spine and heart.

Sandborg, MichaelLinköpings universitet,Medicinsk radiofysik,Hälsouniversitetet(Swepub:liu)micsa02 (författare)
Dance, David R.Joint Department of Physics, The Royal Marsden NHS Trust, London, UK (författare)
Hunt, RogerJoint Department of Physics, The Royal Marsden NHS Trust, London, UK (författare)
Alm Carlsson, GudrunLinköpings universitet,Medicinsk radiofysik,Hälsouniversitetet(Swepub:liu)gudal03 (författare)
Linköpings universitetMedicinsk radiofysik (creator_code:org_t)

Ingår i:Radiation protection dosimetry: Oxford University Press (OUP)114:1-3, s. 355-3580144-84201742-3406

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

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