Title :
Investigation of 3D image artifact caused by projection weighting and misalignment
Abstract :
Much research has been performed in recent years to investigate the causes and corrections for 3D image artifacts in computed tomography (CT). In this paper, we present an investigation into the cause of a sawtooth pattern artifact in reformatted images. We show that the artifact is caused by the interaction of the projection weighting and the CT system iso-center misalignment. Several approaches are presented to combat the artifact. The effectiveness and robustness of the correction schemes are demonstrated by results from computer simulations and phantom experiments.
Keywords :
computerised tomography; filtering theory; image reconstruction; medical image processing; multidimensional signal processing; 3D image artifact; CT system iso-center misalignment; clinical data; computed tomography; computer simulations; correction schemes; effectiveness; misalignment; phantom experiments; projection weighting; reconstruction bias; reformatted images; robustness; sawtooth pattern artifact; Biomedical imaging; Computed tomography; Computer simulation; Data acquisition; Image generation; Image quality; Image reconstruction; Robustness; Teeth; X-ray imaging;
Conference_Titel :
Image Processing, 1999. ICIP 99. Proceedings. 1999 International Conference on
Conference_Location :
Kobe
Print_ISBN :
0-7803-5467-2
DOI :
10.1109/ICIP.1999.822982
