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Monte Carlo study of grid performance in diagnostic radiology: factors which affect the selection of tube potential and grid ratio
Linköping University, Department of Medicine and Health Sciences, 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
n/a.
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Center for Medical Image Science and Visualization, CMIV. 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.
1993 (English)In: British Journal of Radiology, ISSN 0007-1285, Vol. 66, 1164-1176 p.Article in journal (Refereed) Published
Abstract [en]

A Monte Carlo computational model has been developed for the study of the performance of anti-scatter grids in diagnostic radiology. It is used here to estimate the scatter in the image plane from soft tissue phantoms (representing the patient) and to calculate image contrast and the mean absorbed dose in the phantom. Different scattering conditions, representative of various examinations, have been investigated: adult lumbar spine; small field radiography and fluoroscopy; adult chest and paediatric pelvis and chest. For each scattering condition, the combinations of tube potential and grid ratio have been found which, for a well designed grid, result in the lowest mean absorbed dose in the phantom for a fixed contrast level. In examinations which generate large amounts of scatter, the use of high grid ratios in combination with high tube potentials is favourable with regard to both mean absorbed dose in the phantom and tube charge. When less scatter is generated, either the grid ratio or the tube potential can be varied to achieve the desired contrast level. High grid ratios require shorter exposure times, but need careful alignment in the beam to prevent primary radiation cut-off. It is shown that the air gap technique can be used to reduce patient dose in examinations with small amounts of scatter, but in combinations with a lower tube potential than when a grid is used.

Place, publisher, year, edition, pages
1993. Vol. 66, 1164-1176 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-20919DOI: 10.1259/0007-1285-66-792-1164OAI: oai:DiVA.org:liu-20919DiVA: diva2:236800
Available from: 2009-09-25 Created: 2009-09-25 Last updated: 2015-03-20

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Sandborg, MichaelAlm Carlsson, GudrunPersliden, Jan

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