R&D for CT Image Quality Improvement
Driven by clinical applications, the effort devoted to obtaining better image quality (IQ) in CT has been an ever-increasing process. From an architecture point of view, each subsystem of a CT scanner constitutes a loop of its entire imaging chain. Any imperfection or instability in the x-ray source, detector or mechanics may degrade the CT system’s IQ substantially. Only the CT scanners with balanced IQ design, sophisticated data correction and optimized image reconstruction may meet the challenges imposed by advanced clinical applications. Presented in Figure 5 is a schematic of a cone beam CT’s imaging chain and two images reconstructed from the projection data acquired by a flat panel detector. It should be noted that, in comparison to the cylindrical detector utilized in diagnostic CT scanner, the overall performance of a flat panel x-ray detector is inferior. However, as demonstrated, with imaging chain optimization, the severe artifacts existing in the reconstructed image of a water phantom can be totally eliminated, thus improving the IQ dramatically.
Funding Agency: Industry
Grant Type: Industrial
Funding Period: 04/01/13-03/31/18