Novel sampling strategies for x-ray fluorescence computed tomography

Patrick J. La Rivière; Phillip Vargas

doi:10.1117/12.793836

15 September 2008 Novel sampling strategies for x-ray fluorescence computed tomography

Patrick J. La Rivière, Phillip Vargas

Proceedings Volume 7078, Developments in X-Ray Tomography VI; 70780Q (2008) https://doi.org/10.1117/12.793836
Event: Optical Engineering + Applications, 2008, San Diego, California, United States

Abstract

X-ray fluorescence computed tomography (XFCT) is a synchrotron-based imaging modality employed for mapping the distribution of elements within slices or volumes of intact specimens. A pencil beam of external radiation is used to stimulate emission of characteristic X-rays from within a sample, which is scanned and rotated through the pencil beam in a first-generation tomographic geometry. While this line-by-line acquisition is slow, it does provide remarkable flexibility in sampling, since the sampling intervals and patterns are not limited by detector hardware as they are in many imaging modalities. In this work we discuss several ways of exploiting this flexibility to increase imaging speed without sacrificing image quality. This includes: (1) scanning only the half of the object nearest the detector while rotating through 360 degrees, (2) performing so-called interlaced sampling in which the sampling patterns at even and odd projection views are offset relative to one another, and (3) performing 3D helical scanning in which only the half of the object nearest the detector is scanned. The helical sampling is coupled with a novel Fourier-based interpolation scheme we have previously introduced for helical CT.

Citation Download Citation

Patrick J. La Rivière and Phillip Vargas "Novel sampling strategies for x-ray fluorescence computed tomography", Proc. SPIE 7078, Developments in X-Ray Tomography VI, 70780Q (15 September 2008); https://doi.org/10.1117/12.793836

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