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High‐quality initial image‐guided 4D CBCT reconstruction by Shaohua Zhi; Marc Kachelrieß; Xuanqin Mou is a Medicine article available to read on EtoBox.
What is High‐quality initial image‐guided 4D CBCT reconstruction about?
## Purpose Four‐dimensional cone‐beam computed tomography (4D CBCT) has been developed to provide a sequence of phase‐resolved reconstructions in image‐guided radiation therapy. However, 4D CBCT images are degraded by severe streaking artifacts because the 4D CBCT reconstruction process is an extreme sparse‐view CT procedure wherein only under‐sampled projections are used for the reconstruction of each phase. To obtain a set of 4D CBCT images achieving both high spatial and temporal resolution, we propose an algorithm by providing a high‐quality initial image at the beginning of the iterative reconstruction process for each phase to guide the final reconstructed result toward its optimal solution. ## Methods The proposed method consists of three steps to generate the initial image. First, a prior image is obtained by an iterative reconstruction method using the measured projections of the entire set of 4D CBCT images. The prior image clearly shows the appearance of structures in static regions, although it contains blurring artifacts in motion regions. Second, the robust principal component analysis (RPCA) model is adopted to extract the motion components corresponding to each phas
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- Author
- Shaohua Zhi; Marc Kachelrieß; Xuanqin Mou
- Publisher
- Wiley
- Published
- 2020
- Language
- EN
- Field
- Medicine (Health Sciences)