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AOCR 2010 TAIPEI - 13th Asian Oceanian Congress of Radiology

26th International Congress of Radiology (ICR 2010)

 Home > Contents > Abstracts of meetings > Abstract

Abstract


Biomed Imaging Interv J 2006; 2(4):e52-11
doi: 10.2349/biij.2.4.e52-11
© 2006 Biomedical Imaging and Intervention Journal

ABSTRACT
The Basic Principles in Physics of CT

Kwan-Hoong Ng
Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia


The aim of this presentation is to introduce the basic physics of computed tomography (CT) to non-radiologists and other clinical specialists. The basic physics of CT such as attenuation, CT number, windowing, filtered back projection, reconstruction are introduced followed by a review of helical scanning principle of multi-detector row CT (MDCT). Factors affecting CT image quality and radiation dose such as exposure factor, slice thickness, pitch, detector collimation are highlighted. The various dose quantities for CT namely computed tomography dose index (CTDI), dose length product (DLP) and effective dose are discussed. Total radiation burden for a whole body PET/CT scan results from PET component (~10 mSv) and CT component (~ 5 - 20 mSv). Finally the functions of the CT component in PET/CT scanning are highlighted, namely: providing the necessary attenuation correction map for PET imaging; improving precise lesion localization; and the usage of diagnostic quality CT increases resolution at the expense of radiation dose.

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Official publication of

ASEAN Association of Radiologists
ASEAN Society of Interventional Radiology
Asia-Oceania Federation of Organizations for Medical Physics
Asian Oceania Society of Radiology
College of Radiology, Academy of Medicine Malaysia
Southeast Asian Federation of Organisations of Medical Physics
South East Asian Association of Academic Radiologists

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Department of Biomedical Imaging, Faculty of Medicine, University of Malaya, Malaysia



   

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