Hybrid Pre-Log and Post-Log Image Reconstruction for Computed Tomography

Guobao Wang; Jian Zhou; Zhou Yu; Wenli Wang; Jinyi Qi

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Hybrid Pre-Log and Post-Log Image Reconstruction for Computed Tomography

機譯：計算機斷層掃描的混合對數和對數后圖像重建

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Tomographic image reconstruction for low-dose computed tomography (CT) is increasingly challenging as dose continues to reduce in clinical applications. Pre-log domain methods and post-log domain methods have been proposed individually and each method has its own disadvantage. While having the potential to improve image quality for low-dose data by using an accurate imaging model, pre-log domain methods suffer slow convergence in practice due to the nonlinear transformation from the image to measurements. In contrast, post-log domain methods have fast convergence speed but the resulting image quality is suboptimal for low dose CT data because the log transformation is extremely unreliable for low-count measurements and undefined for negative values. This paper proposes a hybrid method that integrates the pre-log model and post-log model together to overcome the disadvantages of individual pre-log and post-log methods. We divide a set of CT data into high-count and low-count regions. The post-log weighted least squares model is used for measurements in the high-count region and the pre-log shifted Poisson model for measurements in the low-count region. The hybrid likelihood function can be optimized using an existing iterative algorithm. Computer simulations and phantom experiments show that the proposed hybrid method can achieve faster early convergence than the pre-log shifted Poisson likelihood method and better signal-to-noise performance than the post-log weighted least squares method.

機譯：隨著劑量在臨床應用中的不斷減少，用于低劑量計算機斷層掃描（CT）的斷層圖像重建越來越具有挑戰性。對數域前方法和對數后域方法已分別提出，每種方法都有其自身的缺點。對數域方法雖然有可能通過使用精確的成像模型來改善低劑量數據的圖像質量，但由于從圖像到測量值的非線性轉換，因此在實踐中會遇到收斂緩慢的問題。相比之下，對數后域方法收斂速度快，但是對于低劑量CT數據，所得圖像質量次優，因為對數轉換對于低計數測量極其不可靠，而對于負值則不確定。本文提出了一種將前測井模型和后測井模型集成在一起的混合方法，以克服單獨的前測井和后測井方法的缺點。我們將一組CT數據分為高計數區和低計數區。對數后加權最小二乘模型用于高計數區域的測量，對數前移位的泊松模型用于低計數區域的測量。可以使用現有的迭代算法優化混合似然函數。計算機仿真和幻像實驗表明，所提出的混合方法比對數后移位的泊松似然方法能夠更快地實現早期收斂，并且比對數后加權最小二乘方法具有更好的信噪性能。

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《IEEE Transactions on Medical Imaging》 |2017年第12期|2457-2465|共9頁
作者
Guobao Wang; Jian Zhou; Zhou Yu; Wenli Wang; Jinyi Qi;
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正文語種 eng
中圖分類
關鍵詞
Computed tomography; Image reconstruction; Computational modeling; Data models; Noise measurement; Convergence;

機譯：計算機體層攝影術;圖像重建;計算建模;數據模型;噪聲測量;收斂;
入庫時間 2022-08-17 13:03:29

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1. Comparison Between Pre-Log and Post-Log Statistical Models in Ultra-Low-Dose CT Reconstruction [J] . Lin Fu, Tzu-Cheng Lee, Soo Mee Kim, Medical Imaging, IEEE Transactions on . 2017,第3期

機譯：超低劑量CT重建前對數和后對數統計模型的比較
2. Aortic root abscess: multimodality imaging with computed tomography and gallium-67 citrate single-photon emission computed tomography/computed tomography hybrid imaging. [J] . McWilliams ET, Yavari A, Raman V Journal of cardiovascular computed tomography . 2011,第2期

機譯：主動脈根部膿腫：計算機斷層掃描和67檸檬酸鎵單光子發射計算機斷層掃描/計算機斷層掃描混合成像的多模態成像。
3. A Hybrid-Cascaded Iterative Framework for Positron Emission Tomography and Single-Photon Emission Computed Tomography Image Reconstruction [J] . Tiwari Shailendra, Srivastava Rajeev Journal of Medical Imaging and Health Informatics . 2016,第4期

機譯：正電子發射層析成像和單光子發射計算機層析成像圖像重建的混合級聯迭代框架
4. Comparison between pre-log and post-log statistical models in low-dose CT iterative reconstruction [C] . Lin Fu, Soo Mee Kim, Adam M. Alessio, IEEE Nuclear Science Symposium and Medical Imaging Conference . 2014

機譯：低劑量CT迭代重建中對數前和對數后統計模型的比較
5. Hybrid method: Algebraic/Inverse Radon Transform for region of interest reconstruction of computed tomography images [D] . Barrera Cruz, Marco Antonio 2009

機譯：混合方法：代數/逆Rad變換，用于重建計算機斷層掃描圖像的感興趣區域
6. Hybrid Pre-log and Post-log Image Reconstruction for Computed Tomography [O] . Guobao Wang, Jian Zhou, Zhou Yu, -1

機譯：用于計算機斷層掃描的對數前和對數后混合圖像重建
7. Hybrid Pre-Log and Post-Log Image Reconstruction for Computed Tomography [O] . Guobao Wang, Jian Zhou, Zhou Yu, 2017

機譯：用于計算斷層掃描的混合預計和后對日志圖像重建
8. Reconstruction Algorithm Development and Assessment for a Computed Tomography Based-Spectral Imager [R] . Ford, B. K., Wilson, M. P., Salazar, J. S. 2005

機譯：基于計算機斷層掃描的光譜成像儀的重建算法開發與評估

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Hybrid Pre-Log and Post-Log Image Reconstruction for Computed Tomography

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