By Hervé Fanet
This ebook describes different ideas and equipments utilized in scientific imaging. value of scientific imaging for diagnostic is strongly expanding and it's now essential to have a superb wisdom of the several actual attainable principles.
Researchers, clinicians, engineers and pros during this region, besides postgraduate scholars within the sign and picture processing box, will locate this booklet of significant interest.
Chapter 1 Interactions among Radiation and topic: results for Detection and clinical Imaging (pages 1–33): Jean?Pierre Moy
Chapter 2 Detectors for scientific Imaging (pages 35–121): Herve Fanet
Chapter three Quantitative electronic Radiography picture Processing (pages 123–160): Jean Rinkel and Jean?Marc Dinten
Chapter four X?Ray Tomography (pages 161–205): Francoise Peyrin and Philippe Douek
Chapter five Positron?Emission Tomography: rules and functions (pages 207–228): Regine Trebossen
Chapter 6 unmarried Photon Imaging (pages 229–265): Irene Buvat
Chapter 7 Optical Imaging (pages 267–324): Anabela Da Silva
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Additional resources for Photon-Based Medical Imagery
Interaction between radiation and a detector In the first case (particle charged with low energy), the range of the particle is short and all charges are created close to the electrode in relation to the incident radiation. It is as if two charges were created, one positive with value Ne and the other negative with value –Ne. In these formulas, N is generally a few thousand, and is a function of the value of the energy of the incident particle; e is the elementary electric charge. We then simply have to directly apply the results of the previous chapter.
However, we must note that the technological progress has lead to the creation of elaborate material with few faults. The recombination phenomena are then limited and our simple model is still relevant. 4. 1. Planar detector The previous principles are illustrated in two examples. 6. It would be necessary to use the theory of semi-conductors to explain the 50 Photon-based Medical Imagery operation in more detail; we simply have to know that in the presence of applied pressure between the two electrodes, a space charge type zone is created in the detector (the depletion zone) in which an electric field E is given by the following equation rules: ε ⋅ div E = e ⋅ N d This simple formula gives the variations of the electric field according to semiconductor doping Nd.
It is always the case in visible radiation, because a visible photon is converted – or not – into a single electron, which can only fall into a single pixel. Conversely, if the spot resulting from an X photon is bigger than a pixel, the signal of a unique photon is shared between several pixels. Even though the first case seems better at first, because the spatial response to a unique photon is more concentrated, in reality there is a loss of information: the impact cannot be located within the pixel.
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