Reconstruction from Fan-beam Projections



The limitations of CT scanner projection systems that used parallel beams of radiation had become a major obstacle to the development of computed tomography. In order to overcome these growing technical barriers, engineers searched for solutions that used a single X-ray tube in which the radiation was collimated into a narrow beam in the shape of a fan (a fan-beam). This increased the speed with which each projection was carried out, as it eliminated unnecessary lateral movement of the tube-detector system. At the same time, it made more efficient use of the power emitted by the tube; the beam angle of the radiation was significantly increased compared to previous designs resulting in a shorter radiation exposure time for the patient and the distortions due to patient movement were minimised. This solution represents essentially a compromise between the simplicity of the projection system and an increase in the speed of the scanner.


Radiation Detector Projection System Angular Distance Convolution Kernel Parallel Projection 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag London Limited 2011

Authors and Affiliations

  1. 1.Department of Computer EngineeringTechnical University of CzestochowaCzestochowaPoland

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