Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9845319 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2005 | 5 Pages |
Abstract
The possibility of achieving better contrast in dental images by selecting specific X-ray energies is investigated. By applying both the low- and the high-photon counting energy threshold of the Medipix2 chip, only a narrow interval of the spectrum of a 60Â keV standard dental source used is selected. The relative contrast between the parts of the tooth with the highest and lowest absorption increases 18% when the energy spread of the X-rays is narrowed from the full spectrum to a 4Â keV window centred around 30Â keV. The small tail of high-energy photons from the full source spectrum lowers the achieved relative contrast significantly. This result can be used in the development of X-ray sources or in consideration of energy weighting.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
Börje Norlin, Christer Fröjdh,