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beam collimation |
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beam collimation, the restriction of x-radiation to the area being examined or treated by confining the beam with metal diaphragms or shutters with high radiation-absorption power. In addition to protecting the patient and others from scatter radiation, beam collimation reduces radiographic density. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| A Siemens Somatom Plus 4 scanner (four slice, 8-mm beam collimation with a pitch of 1A/T140 kV, 155 mAs; Siemens, Malvern, Pennsylvania) was used in all cases. It is estimated that dose reduction, beam collimation (control), rare-earth screens and filtration, carbon fiber materials, more extensive lead shielding, decrease in contrast resolution and use of a pulsed system in digital radiography and an array of constraining techniques in fluoroscopy could reduce exposure by several fold. Mechanical or optical x-ray beam collimation in conjunction with video camera alignment allows confirmation of specific analysis areas/ features. |
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