Development of a portable gamma camera with coded aperture

Gal, O.; Gmar, M.; Ivanov, O. P.; Lainé, Frédéric; Lamadie, Fabrice; Goaller, C. Le; Mahe, C.; Manach, E.; Stepanov, V. E.

doi:10.1016/j.nima.2006.01.119

Cited by 56 publications

(21 citation statements)

References 7 publications

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“…In nuclear medicine, a pinhole collimator is used because the detector is placed very close to the source; however, when searching for hot spots during radiation detection, which is characterized by far-field geometry, the pinhole gamma camera has limited use. When the detected counting rate is low or dominated by background from non-FOV sources, the pinhole system has very low sensitivity (Gal et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Development of a panorama coded-aperture gamma camera for radiation detection

Sun

Zhang

Shuai

et al. 2015

Radiation Measurements

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Section: Introductionmentioning

confidence: 99%

Development of a panorama coded-aperture gamma camera for radiation detection

Sun

Zhang

Shuai

et al. 2015

Radiation Measurements

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“…Coded-aperture imaging of gamma rays is potentially superior to gamma-ray imaging and tomography; it has been developed for many applications -such as nuclear-security, astronomical, and medicalbecause of its higher sensitivity compared with pin-hole cameras and its capability for three-dimensional imaging [3]. Especially for sentinel lymph-node mapping applications [4], which often utilize the gamma emissions from the 99m Tc radioisotope, coded-aperture imaging could be used instead of a common audible-output gamma-ray probe.…”

Section: Introductionmentioning

confidence: 99%

Development of a prototype scintillator-based portable γ-ray imager with coded aperture for intraoperative applications

Shimazoe¹,

Horiki²,

Takahashi³

2015

Nuclear Instruments and Methods in Physics Research Section A:

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“…1). This method of obtaining images arose in x-and γ-ray astronomy [1] and is now being slowly implemented in portable systems with different types of new compact position-sensitive detectors of ionizing radiation by many research groups [2][3][4].Unfortunately, the method of coding apertures has a drawback that makes it difficult to use when the approximate distribution of the sources of γ radiation in a room is unknown. If a high-level source of γ radiation is present near the boundary of the field of view of a system with a coding aperture when an image is being obtained, then spurious sources appear in the reconstructed image, which makes it difficult to analyze the images obtained.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

New approach to the development of a portable gamma-ray camera with the maximum angle-of-view

Ivanov

2010

At Energy

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A scheme of a portable gamma camera to be used for searching for sources of gamma rays and for monitoring radiologically dangerous work is examined. The camera's detector is combined with a one-dimensional coding aperture closed into a ring, whose pattern is based on a linear pseudorandom sequence. An implementation scheme for the camera using modern opto-electronic components is proposed. The parameters of the camera are estimated. Having a mass of about 5 kg, the instrument will have a field of view of 360°in the horizontal plane, angular resolution of 5°, and a field of view of 20°along the vertical axis. The sensitivity of the camera permits detecting 137 Cs and 60 Co which produce an exposure dose rate of 30 nSv/h over 3 and 5 min, respectively, against background to 1 µSv/h.In the last few years, obtaining γ images of contaminated equipment and rooms has become an important preparatory and process operation for maintenance and disassembly of nuclear facilities. This is accomplished by using portable systems for obtaining γ images (gamma camera, gamma imagers); such systems are being developed in many laboratories and produced commercially in several countries with a developed nuclear power industry. The first portable systems used a very simple method of forming a γ image in a position-sensitive detector -the camera-obscura principle. This approach has substantial drawbacks: the need to use thick shielding makes the system heavy, the angle of view of the system does not exceed 50°, and the sensitivity drops sharply toward the periphery of the field of view because a double-cone collimator must be used. In addition, the sensitivity and angular resolution are interrelated and the camera becomes less sensitive as the angular resolution increases.Recently, a different approach with coding apertures has been used to form a γ image in such devices (Fig. 1). This method of obtaining images arose in x-and γ-ray astronomy [1] and is now being slowly implemented in portable systems with different types of new compact position-sensitive detectors of ionizing radiation by many research groups [2][3][4].Unfortunately, the method of coding apertures has a drawback that makes it difficult to use when the approximate distribution of the sources of γ radiation in a room is unknown. If a high-level source of γ radiation is present near the boundary of the field of view of a system with a coding aperture when an image is being obtained, then spurious sources appear in the reconstructed image, which makes it difficult to analyze the images obtained. Spurious sources can be eliminated, but on the whole the system becomes more difficult to use in this case. Of course, γ images obtained with a camera obscura under such conditions likewise are of low quality and contain substantial noise (Fig. 2).The present article proposes a new approach to developing a compact sensitive system for obtaining γ images for use in the situations mentioned above. Spurious sources, which are possible in a camera using a conventional coding aperture, ...

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Development of a portable gamma camera with coded aperture

Cited by 56 publications

References 7 publications

Development of a panorama coded-aperture gamma camera for radiation detection

Development of a panorama coded-aperture gamma camera for radiation detection

Development of a prototype scintillator-based portable γ-ray imager with coded aperture for intraoperative applications

New approach to the development of a portable gamma-ray camera with the maximum angle-of-view

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