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Monte Carlo study of grid performance in diagnostic radiology: task dependent opti­misation for screen-film imaging
Linköping University, Department of Medicine and Care, Radiation Physics. Linköping University, Center for Medical Image Science and Visualization, CMIV. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics. Linköping University, Faculty of Health Sciences.ORCID iD: 0000-0003-3352-8330
The Royal Marsden Hospital.
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences.ORCID iD: 0000-0003-0209-498X
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Faculty of Health Sciences.
1994 (English)In: British Journal of Radiology, ISSN 0007-1285, E-ISSN 1748-880X, Vol. 67, 76-85 p.Article in journal (Refereed) Published
Abstract [en]

An optimization of anti-scatter grid design using Monte Carlo techniques in diagnostic radiology is presented. The criterion for optimization was to find the combinations of the grid parameters (lead strip width, grid ratio and strip density) and tube potential which result in the lowest mean absorbed dose in the patient at fixed image contrast. The optimization was performed in three irradiation geometries, representing different scattering conditions (paediatric examinations, and two adult lumbar spine examinations) and was restricted to grids using fibre materials in covers and interspaces. Grid designs currently available were studied, as were designs which use thinner strips (< 30 µm) and higher grid ratios (> 18). It was found that grids with widely different strip densities (strips cm–1) and grid ratios can have good performance provided that they are used with appropriate strip width and tube potential. With increasing amounts of scatter, the optimal grid requires thicker strips and higher grid ratios. Increasing the strip density and using thinner strips and higher grid ratios are generally required. Grids with low strip density (25 strips cm–1) were found to be less sensitive to alterations in strip width. Optimal grids for paediatric radiology require thinner strips (10–20 µm) than those in currently available grids. Grids on the market are best suited for examinations of the adult body in anteroposterior (AP) view. In the adult lateral view, representing the largest scattering volume, higher grid ratios (> 18) than those in existing grids would be optimal. Examples of good grid designs are given for each examination.

Place, publisher, year, edition, pages
1994. Vol. 67, 76-85 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-20941DOI: 10.1259/0007-1285-67-793-76OAI: oai:DiVA.org:liu-20941DiVA: diva2:236851
Available from: 2009-09-25 Created: 2009-09-25 Last updated: 2017-12-13

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Sandborg, MichaelAlm Carlsson, GudrunPersliden, Jan

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Sandborg, MichaelAlm Carlsson, GudrunPersliden, Jan
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Radiation PhysicsCenter for Medical Image Science and Visualization, CMIVDepartment of Radiation PhysicsFaculty of Health SciencesRadiation Physics
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British Journal of Radiology
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