Improvement of spatial resolution in a Timepix based CdTe photon counting detector using ToT method

Park, Kyeongjin; Lee, Daehee; Lim, Kyung Taek; Kim, Giyoon; Chang, Hing‐Chiu; Ye, Yun; Cho, Gyuseong

doi:10.1016/j.nima.2018.02.050

Cited by 7 publications

(10 citation statements)

References 23 publications

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“…Depending on the number of counted clock ticks, each pixel represents the energy information of the photons. Therefore, it can be used to find the first incident pixel and use it as a reference point [6]. One assumption must be made in the process of determining the reference pixel.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, long x-ray exposure times are dangerous for patients with increased radiation doses in medical applications and limited use due to increased inspection time in industrial applications. Therefore, we set the acquisition time of each frame to 30 us and took 50,000 frames [6]. The total duration of exposure time while capturing the whole image data was 1.5 seconds but maximum frame rate of the detector was 100 fps.…”

Section: Methodsmentioning

confidence: 99%

“…In industrial PCB inspection, the size of the chips is constantly becoming smaller, and they are becoming more complex. Therefore, it is impossible to use a large pixel detector to minimize charge sharing [5,6]. Hence, several studies have been conducted to correct the charge sharing.…”

Section: Introductionmentioning

confidence: 99%

“…In the center-of-mass method, the coordinates of the center of mass are found by using the positions and values of the pixels where charge sharing has occurred. At this time, the reference pixels are divided into smaller sub-pixels to improve the accuracy of the coordinates [6]. Nevertheless, each of the calibration methods introduced in previous studies had its drawbacks.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improving spatial resolution by predicting the initial position of charge-sharing effect in photon-counting detectors

Kim¹,

Park²,

Lim³

et al. 2020

J. Inst.

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A: X-ray photon-counting detectors are considered as next generation x-ray detectors because they offer several advantages over conventional energy-integrating detectors, such as the ability to obtain energy information due to the photon-counting capability. In addition, the contrastto-noise ratio in a photon-counting detector is higher than that of a conventional charge-integration detector due to its direct detection of radiation. Nevertheless, it suffers from charge sharing effect which is caused by diffusion of electrons generated from incident x-rays and k-edge escape photon to other pixels. Due to these phenomena, distortion can occur in terms of the position information and the energy information. In this work, we used the time-over-threshold (ToT) and projection method to compensate for charge sharing. We projected the charge-sharing value of eight neighboring pixels to the center pixel and found the point where the photon had the highest probability of entering the center pixel. We then divided the center pixel into 3 × 3 sections and found the location where the very first x-ray photon was incident through the projection. Using a timepix chip with CdTe pixels, 50,000 images were acquired for 1.5 seconds at intervals of 30 us with the ToT method. At this time, x-ray irradiation was applied to various materials at 80 kVp and 5 uA.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improving spatial resolution by predicting the initial position of charge-sharing effect in photon-counting detectors

Kim¹,

Park²,

Lim³

et al. 2020

J. Inst.

View full text Add to dashboard Cite

show abstract

“…The resolution of such detectors is limited by the pixel size, which must be large enough to fit all the functionality required by the complex algorithms. However, there are known methods that can improve the spatial resolution of a detector applied for high energy physics [5], or astronomy [6][7][8], and both photon counting detectors [9][10][11] and integrating detectors [12][13][14] are used. An alternative digital solution that can be implemented on-chip dedicated to hybrid pixel detectors working in a single photon counting mode is presented in this work.…”

mentioning

confidence: 99%

Charge sharing simulations for new digital algorithms achieving subpixel resolution in hybrid pixel detectors

Krzyżanowska¹,

Niedzielska²,

Szczygieł³

2020

J. Inst.

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Effective atomic number image determination with an energy-resolving photon-counting detector using polychromatic X-ray attenuation by correcting for the beam hardening effect and detector response

Kimoto

Hayashi

Asakawa

et al. 2021

Applied Radiation and Isotopes

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Improvement of spatial resolution in a Timepix based CdTe photon counting detector using ToT method

Cited by 7 publications

References 23 publications

Improving spatial resolution by predicting the initial position of charge-sharing effect in photon-counting detectors

Improving spatial resolution by predicting the initial position of charge-sharing effect in photon-counting detectors

Charge sharing simulations for new digital algorithms achieving subpixel resolution in hybrid pixel detectors

Effective atomic number image determination with an energy-resolving photon-counting detector using polychromatic X-ray attenuation by correcting for the beam hardening effect and detector response

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