1. Investigation of the imaging properties of an x-ray film scanner
- Author
-
W Doler, A Jager, R Vosshenrich, and S Rassow
- Subjects
Scanner ,Materials science ,Logarithm ,Physics::Medical Physics ,Sensitivity and Specificity ,030218 nuclear medicine & medical imaging ,Fingers ,03 medical and health sciences ,0302 clinical medicine ,Optics ,Optical transfer function ,Humans ,Radiology, Nuclear Medicine and imaging ,X-Ray Intensifying Screens ,Image resolution ,Radiological and Ultrasound Technology ,Pixel ,business.industry ,Phantoms, Imaging ,X-Ray Film ,Resolution (electron density) ,X-ray ,Linearity ,Reproducibility of Results ,Equipment Failure Analysis ,Radiographic Image Enhancement ,030220 oncology & carcinogenesis ,Radiographic Image Interpretation, Computer-Assisted ,business - Abstract
The imaging properties of a CCD X-ray film scanner were investigated. The relationship between optical density and the logarithm of output pixel value provides information on the linearity of the system. The resolution properties of the scanner can be characterized by the presampling modulation transfer function (MTF) which was calculated from a set of line spread functions with various alignments relative to the sampling grid. The authors' results show that the scanner is linear up to 2.0 optical density units, which leads to restrictions in digitizing X-ray films with higher optical density. The measured MTF shows the good spatial resolution of the CCD scanner which is demonstrated on an example.
- Published
- 1994