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Digitizing of radiographs with a roller-type CCD scanner
1Division of Oral and Maxillofacial Imaging, School of Dentistry, College of Medicine, National Taiwan University, Taipei.
Summary
This study shows roller-type scanners digitize radiographs with a dynamic range comparable to film densitometers. The scanner offers stable performance and consistent image quality, making it suitable for dental x-ray digitization.
Area of Science:
- Medical Imaging
- Radiology Technology
Background:
- Roller-type scanners offer a method for digitizing radiographic images.
- Evaluating the performance of such scanners is crucial for diagnostic applications.
Purpose of the Study:
- To assess the physical performance of a roller-type scanner.
- Key performance metrics evaluated include dynamic range, scan reproducibility, and image homogeneity.
Main Methods:
- A VXR-12 roller-type scanner and Paint Shop Pro software were used.
- A step tablet on Kodak T-MAT G film was digitized under various settings and positions.
- Image pixel values were analyzed and compared to optical densities measured by a Wellhofer WD 102 Filmdensitometer.
Main Results:
- Digitized images exhibited a dynamic range similar to the film densitometer using default settings.
- The scanner demonstrated consistent image output across different scanning positions, orientations, and power states.
Conclusions:
- The roller-type scanner possesses a dynamic range comparable to film densitometers.
- Stable operating conditions and consistent image quality were observed.
- While suitable for dental x-ray digitization, the scanning resolution may limit some diagnostic uses.