随着高亮度电子束和高功率激光技术的发展，逆康普顿散射（Inverse Compton Scattering, ICS，低能时也称Thomson Scattering, TS）X/γ光源逐渐发展成为一种小型化的仪器，填补了常规X射线源与同步辐射光源之间的性能缺口，为医院、实验室等场景的X射线成像应用提供了前所未有的机遇。课题组聚焦逆康普顿散射X/γ光源成像研究，专注于以下研究方向：

一、逆康普顿散射X/γ光源关键物理

针对逆康普顿散射X/γ光源能谱、产额、焦斑、偏振、OAM等关键物理参数，发展高效的实验测量方法和完备的理论。

二、革新传统X射线成像技术，提升其成像性能

针对传统X射线成像技术在医学诊断中存在的空间分辨率不足、成像灵敏度低、特异性差及图像量化困难等关键瓶颈，依托逆康普顿散射光源发展单能CT、双能和能谱CT、KES、康普顿散射成像技术，在量化成像、材料鉴别和成像效率等方面显著提升成像性能，推动传统医学成像技术的革新。

三、 发展新型X射线成像技术，开辟X射线成像研究的新方向

发展低剂量、高分辨率和高灵敏度的X射线成像新技术，包括相衬成像和XFCT，为解决早期癌症检测的难题提供新方案。

发展基于核共振荧光的成像新技术，为无损检测、核安全和核安保等领域提供核素级超高灵敏度的成像新手段。

四、成像模拟软件、成像算法开发与成像系统研制

逆康普顿散射光源物理和成像领域的代表性论文：

[1] Chi Z, Zhang H, Lin J, et al. A Monte Carlo simulation method for polarized gamma-ray nuclear resonance fluorescence. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2023, 1056: 168666.

[2] Chi Z. X-ray polarization characteristics in the nonlinear Thomson scattering of a laser with relativistic electrons. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2022, 1033: 166681.

[3] Chi Z. Proposal of a compact grating-based phase contrast imaging system using an x-ray polycapillary lens. Journal of Applied Physics, 2021, 129(19).

[4] Chi Z. Polarization transfer from a laser to x rays via Thomson scattering with relativistic electrons: A dipole radiation perspective. Journal of Applied Physics, 2020, 128(24).

[5] Chi Z, Du Y, Huang W, et al. Linearly polarized X-ray fluorescence computed tomography based on a Thomson scattering light source: a Monte Carlo study. Journal of Synchrotron Radiation, 2020, 27(3): 737-745.

[6] Chi Z. GXPS: A Geant4-based Monte Carlo code for x-ray polycapillary simulation. Journal of Applied Physics, 2020, 128(12).

[7] Chi Z, Du Y, Yan L, et al. Experimental feasibility of dual-energy computed tomography based on the Thomson scattering X-ray source. Journal of Synchrotron Radiation, 2018, 25(6): 1797-1802.

[8] Chi Z, Du Y, Huang W, et al. Focal spot characteristics of Thomson scattering x-ray sources. Journal of Applied Physics, 2018, 124(12).

[9] Chi Z, Yan L, Du Y, et al. Recent progress of phase-contrast imaging at Tsinghua Thomson-scattering X-ray source. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2017, 402: 364-369.

[10] Chi Z, Du Y, Yan L, et al. Thomson scattering X-ray source: a novel tool for monochromatic computed tomography. Developments in X-Ray Tomography XI. SPIE, 2017, 10391: 163-171.

受邀参编学术专著：

[1] Chi Z, Du Y, Huang W, et al. High-Efficient Compton Scattering Computed Tomography Based on a Thomson Scattering X-Ray Source. Emerging Radiation Detection: Technology and Applications. Cham: Springer Nature Switzerland, 2024: 165-178.

[2] Chi Z. Linearly Polarized X-ray Fluorescence Computed Tomography with a Photon Counting Detector. Advanced X-ray Detector Technologies: Design and Applications. Cham: Springer International Publishing, 2020: 195-214.