Detector Motion Method to Increase Spatial Resolution in Photon-Counting Detectors

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Medical imaging requires high spatial resolution of an image to identify fine lesions. Photon-counting detectors in medical imaging have recently been rapidly replacing energy-integrating detectors due to the former`s high spatial resolution, high efficiency and low noise. Spatial resolution in a photon counting image is determined by the pixel size. Therefore, the smaller the pixel size, the higher the spatial resolution that can be obtained in an image. However, detector redesigning is required to reduce pixel size, and an expensive fine process is required to integrate a signal processing unit with reduced pixel size. Furthermore, as the pixel size decreases, charge sharing severely deteriorates spatial resolution. To increase spatial resolution, we propose a detector motion method using a large pixel detector that is less affected by charge sharing. To verify the proposed method, we utilized a UNO-XRI photon-counting detector (1- mm CdTe, Timepix chip) at the maximum X-ray tube voltage of 80 kVp. A similar spatial resolution of a 55-mu m-pixel image was achieved by application of the proposed method to a 110-mu m-pixel detector with a higher signal-to-noise ratio. The proposed method could be a way to increase spatial resolution without a pixel redesign when pixels severely suffer from charge sharing as pixel size is reduced.
Publisher
KOREAN PHYSICAL SOC
Issue Date
2017-03
Language
English
Article Type
Article
Keywords

FIELD DIGITAL MAMMOGRAPHY; SCREEN-FILM; ENERGY

Citation

JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.70, no.6, pp.567 - 573

ISSN
0374-4884
DOI
10.3938/jkps.70.567
URI
http://hdl.handle.net/10203/223470
Appears in Collection
NE-Journal Papers(저널논문)
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