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:: Volume 17, Issue 2 (Iranian South Medical journal 2014) ::
Iran South Med J 2014, 17(2): 201-206 Back to browse issues page
Radation distribution in head & thorax computerized tomography
Mohammad Mahdavi1, Masoomeh Hoseinnezhad2, Masoud Vahabbi Moghaddam2
1- Physics Department, Scientific Faculty College, Mazandaran University IRAN , m.mahdavi@umz.ac.ir
2- Physics Department, Scientific Faculty, Guilan University IRAN
Abstract:   (5477 Views)

Background: Determination of the exposure levels in the computerized tomography (CT) practices is necessary to define the respected national reference levels, quality control of CT centers and the risk assessment for radiation induced cancers. Material and Methods: On the basis of this necessity, the radiation exposure distribution due to common CT practices has been investigated at Razi Hospital CT center in Rasht using tissue-equivalent phantoms and the thermoluminescent dosimeters (TLD). The Head and Thorax phantoms were used with the standard dimensions incorporating holes at the center and edges for TLD placement. Dosimetry was carried out using LiF Mg, Cu, P small chips due to their relatively tissue equivalence, high sensitivity convenient annealing procedure and the non-complex glow curve. Results: Results showed that CTDI for Head is 52.85 mGy and for Body is 68.15mGy. CTDLW for Head is 13.67 mGy and for Body is 16.94mGy . Conclusion: In comparison with other radiographical procedures, patient absorbed doses in CT imaging are usually very high. Content of dose is increased by increase of mAs.

Keywords: Dose, Computed Tomography (CT), Phantom, Thermoluminescent Dosimeters, CTDI.
Full-Text [PDF 675 kb]   (1658 Downloads)    
Type of Study: Original | Subject: General
Received: 2012/06/12 | Accepted: 2012/08/15 | Published: 2014/04/14
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Mahdavi M, Hoseinnezhad M, Vahabbi Moghaddam M. Radation distribution in head & thorax computerized tomography . Iran South Med J. 2014; 17 (2) :201-206
URL: http://ismj.bpums.ac.ir/article-1-526-en.html


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Volume 17, Issue 2 (Iranian South Medical journal 2014) Back to browse issues page
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