Metod för dosoptimering av digitalt detektorsystem i klinisk drift
Independent thesis Basic level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Method for dose optimization of computed radiography in clinical use (English)
The county of Dalarna is at present carrying through a process of digitalization where traditional x-ray film is being replaced with digital detectors. Earlier used methods for dose optimization turned out not being sufficient. This report presents a method to harmonize dose levels between x- ray sites equipped with Fujifilm imaging plate systems. An exposure index, S, related to the dose level of the examination is computed to every x-ray image. S turned out to be inversely proportional to the detector dose used at the examination. Detector dose is also the one simulated factor that doubtlessly affects S the most.There are however a lot of parameters, e.g difference between patients, that are not easily simulated even though they still have considerable affect. The method for harmonizing dose levels between x-ray sites are based on statistics of collected S-values for a kind of examination. The average of the collected S-values levels variations and is a more solid measure of the dose level for the examination. By means of this method the dose level of frontal images of the lungs at a site have been reduced by 30 per cent without endanger the diagnostic security.
Place, publisher, year, edition, pages
Institutionen för medicinsk teknik , 2004. , 79 p.
Biotechnology, computed radiography, dose optimization, exposure index
IdentifiersURN: urn:nbn:se:liu:diva-2471ISRN: LITH-IMT/BIT20-EX--03/348--SEOAI: oai:DiVA.org:liu-2471DiVA: diva2:19803
Subject / course