Program including abstracts as pdf available here
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OP 53<br />
aBSTracTS OP 5<br />
Title<br />
RESOLuTION AND MODuLATION TRANSFORM FuNCTION OF DIFFERENT DIGITAL SENSORS<br />
Authors<br />
D. bRuELLMANN 1 , b. KEMPKES 1 , R. SCHuLzE 1<br />
Affiliations<br />
1 Department of Orla Surgery, University Medical Center, Mainz, GERMANY<br />
Body<br />
Objectives:<br />
The aim of this study w<strong>as</strong> to evaluate the resolution and the modulation transfer function<br />
(MTF) of four different sensors.<br />
Methods:<br />
Stripe patterns with a defined line pair per mm (between 2.5 and 20 lp / mm) were used to<br />
evaluate the resolution of four commercial digital sensors usually used for dental radiographs.<br />
Images were made using a Sirona Heliodent DS tube (60kV, 0.02-0.12ms) at a distance of 3cm<br />
on an optical bench. Images were recorded with their native software provided by the manufacturers.<br />
Evaluation w<strong>as</strong> performed after export using ImageJ and Excel.<br />
Results:<br />
The MTF for the newer sensors did not differ tremendously. Radiographic contr<strong>as</strong>t w<strong>as</strong> in an<br />
acceptable range for resolutions between 2.5 and 10 lp/mm. All tested sensors delivered adequate<br />
contr<strong>as</strong>t up to a resolution of 10 lp/mm. Contr<strong>as</strong>t and MTF improved proportional to the<br />
time of radiation exposure.<br />
Conclusion:<br />
All sensors evaluated in this study deliver an adequate modulation transfer function, which is<br />
adequate for digital dental radiographs.<br />
Keywords<br />
Digital Radiographs, Resolution, Modulation Transfer Function<br />
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