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Updated: Dec 16, 2025
X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
Published on: September 11, 2011
Comparison of two digital intraoral radiography imaging systems as a function of contrast resolution and exposure
Kader C Aydin1, Oğuzhan Demirel2, Mutlu Özcan3
1Department of Dentomaxillofacial Radiology, School of Dentistry, Istanbul Medipol University, Istanbul, Turkey - kadercesur@yahoo.com.
Background:
To compare the image quality of two different digital imaging systems; one photostimulable phosphor plate system (PSP) and a direct digital radiography system with CMOS imaging sensor; via evaluating contrast resolution among four different exposure times.
Methods:
Endodontically treated incisor teeth embedded in paraffin blocks are aligned next to a 99.5% Al wedge and exposed for 0.8, 0.1,0.125 and 0.16 seconds using both the CMOS and PSP systems. Using ImageJ software, 5 isometric and isogridded ROI from each root filling area and isometric ROI from the Al stepwedge were calculated.
Results:
Evaluation of the total of 120 images displayed that PSP system produced significantly higher contrast resolution (P<0.05) in regard to pixel values than the CMOS. The CMOS system was non- responsive to increasing dose (P=0.000). Regarding the EqAl values, no significant difference was determined between groups (P>0.05).
Conclusions:
The contrast resolution was higher using the PSP system. It can be estimated that, filling material will be more obvious under lower doses using PSP.
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