Development of ultrahigh resolution radiation imaging detector using 1 mm channel size Si-PM array combined with 0.2 mm × 0.2 mm pixelated GAGG plate

Yamamoto, Seiichi; Kataoka, J.; Fukuchi, Tetsuo; Kamada, Kei; Yoshikawa, Akira

doi:10.1088/1748-0221/13/05/p05028

Cited by 4 publications

(4 citation statements)

References 9 publications

(18 reference statements)

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“…. For a position‐sensitive β‐ray detector, we used a 35 × 35 × 1‐mm 3 Ce‐Doped(La, Gd) 2 Si 2 O 7 (La‐GPS) scintillator, which has 300‐µm fine‐pitch (i.e., 300‐µm micro‐grooved pixels) fabricated by a dicing saw . We coupled the La‐GPS detector to a 2‐inch multianode position‐sensitive photomultiplier tube (PS‐PMT, Hamamatsu H8500).…”

Section: Methodsmentioning

confidence: 99%

“…For a position-sensitive b-ray detector, we used a 35 9 35 9 1-mm 3 Ce-Doped (La, Gd) 2 Si 2 O 7 (La-GPS) scintillator, 9 which has 300-µm fine-pitch (i.e., 300-µm micro-grooved pixels) fabricated by a dicing saw. [10][11][12] We coupled the La-GPS detector to a 2-inch multianode position-sensitive photomultiplier tube (PS-PMT, Hamamatsu H8500). For the detector window, we used three sheets of 12-µm-thick aluminized Mylar foil as light shielding.…”

Section: A System Descriptionmentioning

confidence: 99%

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Beta‐ray imaging system with γ‐ray coincidence for multiple‐tracer imaging

Fukuchi

Yamamoto²,

Kataoka

et al. 2019

Medical Physics

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Purpose Beta‐ray imaging systems are widely used for various biological objects to obtain a two‐dimensional (2D) distribution of β‐ray emitting radioisotopes. However, a conventional β‐ray imaging system is unsuitable for multiple‐tracer imaging, because the continuous energy distribution of β‐rays complicates distinguishing among different tracers by energy information. Therefore, we developed a new type of β‐ray imaging system, which is useful for multiple tracers by detecting coincidence γ‐rays with β‐rays, and evaluated its imaging performance. Methods Our system is composed of position‐sensitive β‐ray and γ‐ray detectors. The former is a 35 × 35 × 1‐mm3 Ce‐Doped((La, Gd)2Si2O7) (La‐GPS) scintillation detector, which has a 300‐µm pitch of pixels. The latter is a 43 × 43 × 16‐mm3 bismuth germanium oxide (BGO) scintillation detector. Both detectors are mounted on a flexible frame and placed in a user‐selectable position. We experimentally evaluated the performance of the β‐ray detector and the γ‐ray efficiencies of the γ‐ray detector with different energies, positions, and distances. We also conducted point sources and phantom measurements with dual isotopes to evaluate the system performance of multiple‐tracer imaging. Results For the β‐ray detector, the β‐ray detection efficiencies for 45Ca (245‐keV maximum energy) and 90Sr/90Y (545 and 2280‐keV maximum energy) were 14.3% and 21.9%, respectively. The total γ‐ray detection efficiency of the γ‐ray detector for all γ‐rays from 22Na (511‐keV annihilation γ‐rays and a 1275‐keV γ‐ray) in the center position with a detector distance of 20 mm was 17.5%. From a point‐source measurement using 22Na and 90Sr/90Y, we successfully extracted the position of a positron‐γ emitter 22Na. Furthermore, for a phantom experiment using 45Ca and 18F or 18F and 22Na, we successfully extracted the distribution of the second tracer using the annihilation γ‐ray or de‐excitation γ‐ray coincidence. In all the imaging experiments, the event counts of the extracted images were consistent with the counts estimated by the measured γ‐ray efficiencies. Conclusions We successfully demonstrated the feasibility of our β‐ray autoradiography system for imaging multiple isotopes. Since our system can identify not only a β‐γ emitter but also a positron emitter using the coincidence detection of annihilation γ‐rays, it is useful for PET tracers and various new applications that are otherwise impractical.

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Section: Methodsmentioning

confidence: 99%

Section: A System Descriptionmentioning

confidence: 99%

Beta‐ray imaging system with γ‐ray coincidence for multiple‐tracer imaging

Fukuchi

Yamamoto²,

Kataoka

et al. 2019

Medical Physics

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“…Fiber-structured scintillators [4,5] provide one possible method to improve the scintillator plate. These are promising materials for high-resolution Xray imaging detectors as well as alpha cameras [6,7] or gamma cameras [8,9], and fiber-based scintillator is now becoming the new active research field in scintillator development [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A high-resolution X-ray microscope system for performance evaluation of scintillator plates

et al. 2022

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In the development of new scintillators for X-ray imaging, a high-resolution and highly efficient system is required to evaluate the performance of the scintillator plates. For this purpose, we developed a high-resolution X-ray microscope system. The developed compact X-ray microscope system is based on a magnifying unit and a cooled charge-coupled device (CCD) camera, combined with a small industrial X-ray irradiation system. Using this system, we carried out imaging of three scintillator plates and evaluated their spatial resolution. Each scintillator plates was set in front of the lens of the objective, X-rays were irradiated to the scintillator plates, and transmission images of masks were acquired. The measured spatial resolution of the scintillator plates varied from 16 μm to 30 μm, depending on the type of scintillator plate. The focus size of the X-ray tube had an almost negligible effect on the spatial resolution of the images for the evaluated scintillator plates.

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“…Fiber-structured scintillators [1,2] are promising materials for high-resolution X-ray imaging detectors as well as alpha cameras [3,4] or gamma cameras [5,6], and their use is now becoming a new active research field in scintillator development [7][8][9][10]. One possible method for developing a fiber-structured scintillator is to enclose the scintillator in a large number of small holes in a capillary plate.…”

Section: Introductionmentioning

confidence: 99%

Development of a capillary plate based fiber-structured ZnS(Ag) scintillator

et al. 2022

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Silver-doped zinc sulfide (ZnS(Ag)) is an opaque powder scintillator that is mainly used for detection or imaging of charged particles such as alpha particles. Since ZnS(Ag) is not transparent, the thickness of ZnS(Ag) was limited to ∼10 μm. If a thicker ZnS(Ag) scintillator could be developed, it would be useful for studies such as high-energy particle ion detection as well as beta particle or gamma photon detection. We developed a ZnS(Ag) fiber-structured scintillator using a capillary plate in which ZnS(Ag) powder was encapsulated in the capillaries. The thickness of the capillary plate was 400 μm, and the light produced in ZnS(Ag) escaped from the capillaries, spread through the transparent lead glass area, and reached the opposite side of the plate; consequently, the opaque character and absorption of light could be avoided. The amount of light emitted from the capillary plate based fiber-structured ZnS(Ag) was almost the same as that of a commercially available ZnS (Ag) film, but the detection efficiency was about 1/5 (∼ 20%). The amount of light emitted from beta particles and gamma photons per MeV was less than 1% of that from alpha particles. The spatial resolution of the developed capillary plate based fiber-structured ZnS(Ag) scintillator for 5.5 MeV alpha particles was ∼200 μm FWHM. Imaging of the slits and light spots from alpha particles could be achieved with the developed scintillator combined with an electron-multiplied charge-coupled device (EM-CCD) camera. The developed capillary plate based fiber-structured ZnS(Ag) will be useful for detecting high-energy particle ions.

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Development of ultrahigh resolution radiation imaging detector using 1 mm channel size Si-PM array combined with 0.2 mm × 0.2 mm pixelated GAGG plate

Cited by 4 publications

References 9 publications

Beta‐ray imaging system with γ‐ray coincidence for multiple‐tracer imaging

Beta‐ray imaging system with γ‐ray coincidence for multiple‐tracer imaging

A high-resolution X-ray microscope system for performance evaluation of scintillator plates

Development of a capillary plate based fiber-structured ZnS(Ag) scintillator

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