Image quality of flat panel cone-beam CT

Georg Rose, Jens Wiegert, Dirk Schäfer, Klaus Fiedler, Norbert Conrads, Jan Timmer, Volker Rasche, Niels Noordhoek, Erhard Klotz, Reiner Koppe


We present results on 3D image quality in terms of spatial resolution (MTF) and low contrast detectability, obtained on a flat dynamic X-ray detector (FD) based cone-beam CT (CB-CT) setup. Experiments have been performed on a high precision bench-top system with rotating object table, fixed X-ray tube and 176×176 mm2 active detector area (Trixell Pixium 4800). Several objects, including CT performance-, MTF- and pelvis phantoms, have been scanned under various conditions, including a high dose setup in order to explore the 3D performance limits. Under these optimal conditions, the system is capable of resolving less than 1% (∼10 HU) contrast in a water background. Within a pelvis phantom, even inserts of muscle and fat equivalent are clearly distinguishable. This also holds for fast acquisitions of up to 40 fps. Focusing on the spatial resolution, we obtain an almost isotropic three-dimensional resolution of up to 30 Ip/cm at 10% modulation.

Original languageEnglish
Title of host publicationMedical Imaging 2003: Physics of Medical Imaging
Number of pages7
Publication date15.09.2003
Publication statusPublished - 15.09.2003
EventMedical Imaging 2003: Image Processing - San Diego, United States
Duration: 15.02.200320.02.2003
Conference number: 61433


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