Visualization of radioactive substances with a Si/CdTe Compton Camera

Takahashi, Tadayuki; Takeda, Shin’ichiro; Tajima, H.; Watanabe, Shin

doi:10.1109/nssmic.2012.6551958

Cited by 31 publications

(21 citation statements)

References 23 publications

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“…Here the Compton camera provides both tracking and spectroscopy to locate and analyze remote sources of radioactive waste X-rays in the 500 keV energy range at a distance of meters [3, 4]. Since X-rays in the same energy range are used in SPECT, the same instruments can be used there.…”

Section: Instrumentation For Photonsmentioning

confidence: 99%

Particle detector applications in medicine

Sadrozinski

2013

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Instrumentation For Photonsmentioning

confidence: 99%

Particle detector applications in medicine

Sadrozinski

2013

Nuclear Instruments and Methods in Physics Research Section A:

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“…Compton imaging technique is one of the most powerful techniques for gamma-ray imaging. Especially in the energy band from few 100 keV to few MeV, it has been used in various fields including astrophysics [1,2], medical imaging [3] and radiation monitoring [4,5] because Compton scattering becomes the dominant interaction of photons with matter in this energy range. In Compton imaging, by measuring interaction positions and deposit energies of a Compton-scattered gamma-ray, the scattering angle is calculated and the incoming direction of the gamma-ray is constrained on a cone based on the kinematics of Compton scattering.…”

Section: Introductionmentioning

confidence: 99%

Development of Si-CMOS hybrid detectors towards electron tracking based Compton imaging in semiconductor detectors

Yoneda

Watanabe

Ikeda

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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Electron tracking based Compton imaging is a key technique to improve the sensitivity of Compton cameras by measuring the initial direction of recoiled electrons. To realize this technique in semiconductor Compton cameras, we propose a new detector concept, Si-CMOS hybrid detector. It is a Si detector bump-bonded to a CMOS readout integrated circuit to obtain electron trajectory images. To acquire the energy and the event timing, signals from N-side are also read out in this concept. By using an ASIC for the N-side readout, the timing resolution of few µs is achieved. In this paper, we present the results of two prototypes with 20 µm pitch pixels. The images of the recoiled electron trajectories are obtained with them successfully. The energy resolutions (FWHM) are 4.1 keV (CMOS) and 1.4 keV (N-side) at 59.5 keV. In addition, we confirmed that the initial direction of the electron is determined using the reconstruction algorithm based on the graph theory approach. These results show that Si-CMOS hybrid detectors can be used for electron tracking based Compton imaging.

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“…Besides, this device was the first Compton camera used after the Fukushima accident to obtain radiation distribution maps [8].…”

Section: Introductionmentioning

confidence: 99%

Architecture and characterization of the P4DI CMOS hybrid pixel sensor

Chatzistratis

Theodoratos²,

Kazas

et al. 2017

J. Inst.

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A: Gamma ray imaging can be used for the extraction either of the activity map of a source or of the attenuation map of an object or both, as well as for the identification of the material composition of the emitting source or the object. All these imaging modalities can benefit from instruments giving the information of the energy of the converted photons and also the spatial and time coordinates of the conversion. The P4DI CMOS and hybrid provides the core technology for this task being a 2-D array based on Cd(Zn)Te material for the sensing layer. It consists of 1250 pixels with 400 µm pitch. The energy resolution of the 241 Am photopeak is 3.5 keV, time resolution is less than 12 µs and power consumption is less than 100 mW. Architecture and characterization are described.

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Visualization of radioactive substances with a Si/CdTe Compton Camera

Cited by 31 publications

References 23 publications

Particle detector applications in medicine

Particle detector applications in medicine

Development of Si-CMOS hybrid detectors towards electron tracking based Compton imaging in semiconductor detectors

Architecture and characterization of the P4DI CMOS hybrid pixel sensor

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