title: Performance evaluation of a modular detector unit for X-ray computed tomography.
abstract: A research prototype CT scanner is currently under development in our lab. One of the key components in this project is the CT detector. This paper describes the design and performance evaluation of the modular CT detector unit for our proposed scanner. It consists of a Photodiode Array Assembly which captures irradiating X-ray photons and converts the energy into electrical current, and a mini Data Acquisition System which performs current integration and converts the analog signal into digital samples. The detector unit can be easily tiled together to form a CT detector. Experiments were conducted to characterize the detector performance both at the single unit level and system level. The noise level, linearity and uniformity of the proposed detector unit were reported and initial imaging studies were also presented which demonstrated the potential application of the proposed detector unit in actual CT scanners.
authors.affiliation: Department of Biomedical Engineering, Tsinghua University, Beijing 100084, China. guozhe06@gmail.com
authors.forename: Zhe
authors.initials: Z
authors.lastname: Guo
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Tang
authors.forename: Xinzeng
authors.initials: X
authors.lastname: Wang
authors.forename: Mingliang
authors.initials: M
authors.lastname: Deng
authors.forename: Guangshu
authors.initials: G
authors.lastname: Hu
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
mesh_terms: D016477:Artifacts; D006801:Humans; D019047:Phantoms, Imaging; D025341:Principal Component Analysis; D011856:Radiographic Image Enhancement; D015898:Tomography Scanners, X-Ray Computed; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*