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Radiation Protection Dosimetry Advance Access published online on February 3, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/nci749
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Leuvens Special Issue Article

RADIATION DOSE VS. IMAGE QUALITY FOR LOW-DOSE CT PROTOCOLS OF THE HEAD FOR MAXILLOFACIAL SURGERY AND ORAL IMPLANT PLANNING

M. Loubele 1 *, R. Jacobs 2, F. Maes 1, F. Schutyser 3, D. Debaveye 2, R. Bogaerts 4, W. Coudyzer 5, D. Vandermeulen 1, J. van Cleynenbreugel 1, G. Marchal 5, and P. Suetens 1

1 Medical Image Computing-ESAT/PSI, University Hospital Gasthuisberg, Katholieke Universiteit Leuven, Herestraat 49, B-3000 Leuven, Belgium
2 Oral Imaging Centre, School for Dentistry, Oral Pathology and Maxillofacial Surgery, Katholieke Universiteit Leuven, Kapucijenvoer 7, B-3000 Leuven, Belgium
3 Medical Image Computing-ESAT/PSI, University Hospital Gasthuisberg, Katholieke Universiteit Leuven, Herestraat 49, B-3000 Leuven, Belgium; Medicim NV, Callaertstraat 49, B-9100 Sint-Niklaas, Belgium
4 Unit of Person Dosemetry, Radiation Protection, University Hospital Gasthuisberg, Katholieke Universiteit Leuven, Herestraat 49, B-3000 Leuven, Belgium
5 Department Radiology, University Hospital Gasthuisberg, Katholieke Universiteit Leuven, Herestraat 49, B-3000 Leuven, Belgium

* To whom correspondence should be addressed.
M. Loubele, E-mail: Miet.Loubele{at}uz.kuleuven.ac.be


  Abstract

The goal of this study was to determine the acquisition parameters for a low-dose multi-slice CT protocol and to compare the effective dose and the image quality of this low-dose protocol with the image quality of a clinical multi-slice CT protocol, routinely used for visualisation of the head. The low-dose protocol was derived from a clinical multi-slice CT protocol by lowering mA s and kV and increasing the pitch. The low-dose protocol yielded a dose reduction from 1.5 to 0.18 mSv for a multi-slice CT scan of the whole head, whereas noise in the low-dose CT images was increased. For bone segmentation, noise could be reduced by use of a non-linear edge preserving smoothing filter. Tests on ESP and skull phantom indicated that the accuracy of the measurements on low-dose CT is acceptable for image-based planning of maxillofacial and oral implant surgery, reducing the dose by a factor of 8.


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