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Accurately calculating radiation dose

When a patient is incorrectly positioned for a scan the isocenter may be exposed to a higher level of radiation. This effect is accentuated by an increased distance between the patient and the detector during the acquisition of the Topogram. Here, two Topograms can be compared, scanned with the same parameters but different table heights.

Image 1: Patient correctly positioned in the isocenter
Image 2: Patient positioned below the isocenter, here the same anatomical structure appears larger.

Date: Mar 01, 2012

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