A high sensitivity 4<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e921" altimg="si5.svg"><mml:mi>π</mml:mi></mml:math> view gamma imager with a monolithic 3D position-sensitive detector

Ye, Qing; Fan, Pingzhi; Wang, Rui; Lyu, Zhenlei; Hu, Ankang; Wei, Qingyang; Xia, Yan; Yao, Rutao; Liu, Yaqiang; Ma, Tianyu

doi:10.1016/j.nima.2019.05.022

Cited by 11 publications

(3 citation statements)

References 25 publications

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“…Our group investigated several potential methods of industrial gamma imaging with position-sensitive scintillators. Previously proposed gamma cameras are composed of scintillator-only designs, including monolithic scintillators [ 11 ], uniformly distributed scintillators [ 27 , 28 ], or mosaic-patterned scintillators [ 12 ]. These designs achieve excellent imaging performance for 99m Tc (140 keV) sources and promising results for 18 F (511 keV) and 137 Cs (662 keV) sources.…”

Section: Discussionmentioning

confidence: 99%

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A Wide Energy Range and 4π-View Gamma Camera with Interspaced Position-Sensitive Scintillator Array and Embedded Heavy Metal Bars

Lyu

Fan

et al. 2023

Sensors

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(1) Background: Gamma cameras have wide applications in industry, including nuclear power plant monitoring, emergency response, and homeland security. The desirable properties of a gamma camera include small weight, good resolution, large field of view (FOV), and wide imageable source energy range. Compton cameras can have a 4π FOV but have limited sensitivity at low energy. Coded-aperture gamma cameras are operatable at a wide photon energy range but typically have a limited FOV and increased weight due to the thick heavy metal collimators and shielding. In our lab, we previously proposed a 4π-view gamma imaging approach with a 3D position-sensitive detector, with which each detector element acts as the collimator for other detector elements. We presented promising imaging performance for 99mTc, 18F, and 137Cs sources. However, the imaging performance for middle- and high-energy sources requires further improvement. (2) Methods: In this study, we present a new gamma camera design to achieve satisfactory imaging performance in a wide gamma energy range. The proposed gamma camera consists of interspaced bar-shaped GAGG (Ce) crystals and tungsten absorbers. The metal bars enhance collimation for high-energy gamma photons without sacrificing the FOV. We assembled a gamma camera prototype and conducted experiments to evaluate the gamma camera’s performance for imaging 57Co, 137Cs, and 60Co point sources. (3) Results: Results show that the proposed gamma camera achieves a positioning accuracy of < 3° for all gamma energies. It can clearly resolve two 137Cs point sources with 10° separation, two 57Co and two 60Co point sources with 20° separation, as well as a 2 × 3 137Cs point-source array with 20° separation. (4) Conclusions: We conclude that the proposed gamma camera design has comprehensive merits, including portability, 4π-view FOV, and good angular resolution across a wide energy range. The presented approach has promising potential in nuclear security applications.

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Section: Discussionmentioning

confidence: 99%

“…Our lab recently proposed a 4π-view gamma imaging approach using a collimatorless, 3D position-sensitive detector [ 11 ]. We propose a novel idea that each detector element plays a role of collimation for other detector elements.…”

Section: Introductionmentioning

confidence: 99%

A Wide Energy Range and 4π-View Gamma Camera with Interspaced Position-Sensitive Scintillator Array and Embedded Heavy Metal Bars

Lyu

Fan

et al. 2023

Sensors

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“…Traditional technologies use dedicated radiation detection instruments such as gas detectors, scintillator detectors, and semiconductor detectors [5,6]. Nowadays, various kinds of novel radiation source locating or imaging systems [7][8][9][10] have been developed for radiation monitoring and fast locating the radiation sources.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement of ionizing radiation and heart rate using a smartphone camera

et al. 2020

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Complementary metal oxide semiconductor (CMOS) cameras have been used to detect ionizing radiation when shaded from light or under the condition of static scenes. We propose a novel idea for simultaneous measurement of ionizing radiation and heart rate (HR) by using a smartphone with its CMOS camera lens covered by a finger in one measurement. Verified experiments were conducted: videos were recorded using a Xiaomi8 smartphone when the camera lens was covered by a finger and a light-tight tape for controlled experiment, with a ∼33 mCi 99mTc liquid radioactive source at six different distances (from 20 to 70 cm, step size 10 cm) from the camera. The exact HRs were measured using an oximeter at the same time. Image processing algorithm is proposed to extract radiation events and HR in the same videos. Results show that: (1) frame numbers containing radiation-related bright spots in two experiments have a linear relationship, and they are inversely proportional to the square of the distance between the camera and radiation source; (2) the HR difference between the video processing and the oximeter result is less than 2 beats per minute. In conclusion, it verifies that the proposed method is available to detect ionizing radiation and measure HR simultaneously with smartphone camera lens covered by a finger. We have been working on the development of an Android phone application based on the algorithms.

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Artifact analysis of a far-field coded-aperture gamma camera extended to partially coded field-of-view

Liu²,

Zhang³

et al. 2022

Radiat Detect Technol Methods

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A high sensitivity 4π view gamma imager with a monolithic 3D position-sensitive detector

Cited by 11 publications

References 25 publications

A Wide Energy Range and 4π-View Gamma Camera with Interspaced Position-Sensitive Scintillator Array and Embedded Heavy Metal Bars

A Wide Energy Range and 4π-View Gamma Camera with Interspaced Position-Sensitive Scintillator Array and Embedded Heavy Metal Bars

Simultaneous measurement of ionizing radiation and heart rate using a smartphone camera

Artifact analysis of a far-field coded-aperture gamma camera extended to partially coded field-of-view

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