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Radiation Protection Dosimetry Advance Access originally published online on November 28, 2007
Radiation Protection Dosimetry 2008 128(2):129-132; doi:10.1093/rpd/ncm431
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Time for Unification of CT Dosimetry with Radiography and Fluoroscopy

The first 150 words of the full text of this article appear below.

BACKGROUND

Patient doses in computerised tomography (CT) are of considerable interest, given the increased utilisation of CT imaging as well as their relatively high radiation doses. In the USA, for example, one estimate showed that CT contributes nearly 70% of the total medical dose. CT radiation dosimetry is presently based on the computed tomography dose index (CTDI), which relates to the dose profile [D(z)] along a line (z-axis) that is perpendicular to the plane of rotation of the CT X-ray tube. For a single rotation of the X-ray tube through 360°, CTDI is defined by


Formula 431M1

(1)
where T is the nominal slice thickness, and the integration length of the most commercial pencil ionisation chambers is chosen to be 10 cm. CTDI may be measured free-in-air (CTDIair), or in acrylic cylinders that are taken to represent a patient's head (16-cm diameter) or body (32-cm diameter).

The . . . [Full Text of this Article]

KERMA-AREA PRODUCT IN CT

INTERPRETING CT KAP VALUES

BENEFITS OF KAP IN CT

Walter Huda

Medical University of South Carolina


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