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2009 | 15 | 4 | 215-226
Article title

Influence of exposure parameters on patient dose and image noise in computed tomography

Content
Title variants
Languages of publication
EN
Abstracts
EN
This work presents the results of investigation of influence of main exposure parameters on the patient dose and image noise on five clinical computed tomography units. Patient dose was determined by means of the quantity CTDIair free on air measured with pencil shaped ionization chamber. The image noise was estimated as a standard deviation of CT numbers in a 500 mm2 central region of interest in a water-equivalent phantom positioned in the centre of rotation. The alteration of tube voltage and tube current show the potential in patient dose reduction up to 40% but may deteriorate image quality and has to be carefully applied in order to optimize the clinical CT protocols taking into account the specific clinical task. This survey is essential for optimization of routine CT protocols especially for CT units without automatic exposure control systems, which are main part of CT units in Bulgaria.
Publisher
Year
Volume
15
Issue
4
Pages
215-226
Physical description
Dates
published
1 - 1 - 2009
online
22 - 9 - 2010
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_v10013-009-0021-9
Identifiers
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