
Proceedings Paper
Impact of norm selections on the performance of four-dimensional cone-beam computed tomography (4DCBCT) using PICCSFormat | Member Price | Non-Member Price |
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Paper Abstract
Iterative image reconstruction methods have been proposed in computed tomography to address two major
challenges: one is to reduce radiation dose while maintaining image quality and the other is to reconstruct
diagnostic quality images from angularly sparse projection datasets. A variety of regularization models have
been introduced in these iterative image reconstruction methods to incorporate the desired image features. To
address the sparse view angle image reconstruction problem in four-dimensional cone-beam CT (4DCBCT),
Prior Image Constrained Compressed Sensing (PICCS) was proposed. In the past in 4DCBCT, as well as
other applications of the PICCS algorithm, the PICCS regularization was formulated using the 1 norm as
the means to promote image sparsity. The 1 norm in the objective function is not differentiable and thus
may pose challenges in numerical implementations. When the norm deviates from 1.0, the differentiability of
the objective function improves, however, the imaging performance may degrade in image reconstruction from
sparse datasets. In this paper, we study how the performance of PICCS-4DCBCT changes with norm selection
and whether the introduction of a reweighted scheme in relaxed norm PICCS reconstruction helps improve the
imaging performance.
Paper Details
Date Published: 19 March 2014
PDF: 6 pages
Proc. SPIE 9033, Medical Imaging 2014: Physics of Medical Imaging, 903308 (19 March 2014); doi: 10.1117/12.2043509
Published in SPIE Proceedings Vol. 9033:
Medical Imaging 2014: Physics of Medical Imaging
Bruce R. Whiting; Christoph Hoeschen, Editor(s)
PDF: 6 pages
Proc. SPIE 9033, Medical Imaging 2014: Physics of Medical Imaging, 903308 (19 March 2014); doi: 10.1117/12.2043509
Show Author Affiliations
Yinsheng Li, Univ. of Wisconsin-Madison (United States)
Jie Tang, Univ. of Wisconsin-Madison (United States)
Jie Tang, Univ. of Wisconsin-Madison (United States)
Guang-Hong Chen, Univ. of Wisconsin-Madison (United States)
Published in SPIE Proceedings Vol. 9033:
Medical Imaging 2014: Physics of Medical Imaging
Bruce R. Whiting; Christoph Hoeschen, Editor(s)
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