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Distributions of scatter-to-primary ratios in chest PA radiography using grid or air gap for scatter-rejection
Linköping University, Department of Medicine and Care, Radio Physics. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Medicine and Care, Radio Physics. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics.ORCID iD: 0000-0003-3352-8330
Department of Physics, The Royal Marsden NHS Trust, UK.
Department of Physics, The Royal Marsden NHS Trust, UK.
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2004 (English)Report (Other academic)
Abstract [en]

The aim for this work was to calculate distributions of scatter-to-primary ratios (εs/εp) and signal-to-noise ratios per pixel (SNRp) for a large set of imaging systems with either grid or air gap for scatter rejection. Grids with ratio 8-16 and air gap length 20 and 40 cm were used. The tube voltage was varied between 90-150 kV and three patient thickness between 20-28 cm were tested in order to compare scatter-rejections techniques for different conditions. Distributions of this sort may provide useful information on how physical image quality (contrast, SNR) is distributed over the chest PA image. A Monte Carlo computer program was used for the calculations, including a model of both the patient (voxel phantom) and the imaging system. The mean value of the εs/εp is 0.39 in the hilar region and 1.72 in the lower mediastinal region. For a 28 cm patient, the corresponding values are 0.42 in the hilar region and 2.58 in the lower mediastinal region. The grid with ratio 16 is the most efficient scatter rejection technique in all regions except the hilar region. In the hilar region, the most efficient technique is the 40 cm air gap.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press , 2004. , 39 p.
Series
Report / Department of Radiology, Linköping University, 1998-, 100
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:liu:diva-57875ISRN: LIU-RAD-R-100OAI: oai:DiVA.org:liu-57875DiVA: diva2:328214
Available from: 2010-07-02 Created: 2010-07-02 Last updated: 2015-03-20Bibliographically approved

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Ullman, GustavSandborg, MichaelAlm Carlsson, Gudrun

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Ullman, GustavSandborg, MichaelAlm Carlsson, Gudrun
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Radio PhysicsFaculty of Health SciencesDepartment of Radiation Physics
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