Distributions of scatter to primary ratios and signal to noise ratios per pixel in digital chest imaging
2005 (English)In: Radiation protection dosimetry, ISSN 0144-8420 (print), 1742-3406 (online), Vol. 114, no 1-3, 355-358 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2005. Vol. 114, no 1-3, 355-358 p.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-13218DOI: 10.1093/rpd/nch530OAI: oai:DiVA.org:liu-13218DiVA: diva2:18071