Richard Powys

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OBJECTIVES It is well accepted that collimation is a cost-effective dose-reducing tool for X-ray examinations. This phantom-based study investigated the impact of X-ray beam collimation on radiation dose to the lenses of the eyes and thyroid along with the effect on image quality in facial bone radiography. METHODS A three-view series (occipitomental,(More)
In January 1991 GeoSea produced its first report for die Rijksinstituut voor Kust en Zee, Haren, which presented the results of a Sediment Trend Analysis (STA™) for the Eems/Dollard Estuary. An STA is a technique pioneered by GeoSea which uses the relative changes in the grain-size distributions of bottom sediments to develop patterns of net sediment(More)
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