ComptoNet: a Compton-map guided deep learning framework for multi-scatter estimation in multi-source stationary CT.

Authors

Xia Y,Zhang L,Xing Y,Chen Z,Gao H

Affiliations (5)

  • Department of Engineering Physics, Tsinghua University, Beijing, China, Beijing, 100084, CHINA.
  • Department of Engineering Physics, Tsinghua University, Room 510, liuqing Building, Beijing 100084, beijing, 100084, CHINA.
  • Department of Engineering Physics, Tsinghua University, Room 814A, ZiJing Building 15#, Beijing 100084, Beijing, 100084, CHINA.
  • Engineering Physics, Tsinghua University, Beijing, China, Beijing, Beijing, 100084, CHINA.
  • Engineering Physics, Tsinghua University, Liuqing Bldg #509, Haidian District, Tsinghua University, Bejing, Beijing, 100084, CHINA.

Abstract

Multi-source stationary computed tomography (MSS-CT) offers significant advantages in medical and industrial applications due to its gantryless scan architecture and capability of simultaneous multi-source emission. However, the lack of anti-scatter grid deployment in MSS-CT leads to severe forward and cross scatter contamination, necessitating accurate and efficient scatter correction. In this work, we propose ComptoNet, an innovative decoupled deep learning framework that integrates Compton-scattering physics with deep learning for scatter estimation in MSS-CT. The core innovation lies in the Compton-map, a representation of large-angle Compton scatter signals outside the scan field of view. ComptoNet employs a dual-network architecture: a Conditional Encoder-Decoder Network (CED-Net) guided by reference Compton-maps and spare detector data for cross scatter estimation, and a Frequency U-Net with attention mechanisms for forward scatter correction. Experiments on Monte Carlo-simulated data demonstrate ComptoNet's superior performance, achieving a mean absolute percentage error (MAPE) of $0.84\%$ on scatter estimation. After correction, CT images show nearly artifact-free quality, validating ComptoNet's robustness in mitigating scatter-induced errors across diverse photon counts and phantoms.

Topics

Journal Article

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