An X-ray imaging pixel detector based on a scintillating guides screen

Kleimann, P.; Linnros, Jan; Fröjdh, Christer; Petersson, C. S.

doi:10.1109/23.873001

Cited by 36 publications

(19 citation statements)

References 8 publications

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“…Four methods for fabricating pixelated CsI(Tl) have been reported, namely a laser cutting method [3], scintillator-filled pores in a silicon matrix [4][5][6] and scintillator filling in an SU-8 mold [7]. Recently, a new deposition method for fabricating pixelated CsI(Tl) was introduced, which used patterned SU-8 photo resist (PR) on a glass substrate [8].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the sensitivity and spatial resolution of pixelated CsI:Tl scintillator with reflective coating

Kyung

Bae

Lee

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Introductionmentioning

confidence: 99%

Improvement of the sensitivity and spatial resolution of pixelated CsI:Tl scintillator with reflective coating

Kyung

Bae

Lee

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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“…In order the visible light to achieve the photodetector and avoid cross-talk between adjacent pixels, it is necessary to have a good reflective material between them. Some approaches have been attempted by using silicon to this purpose [2,3]. The problem of these approaches is that CsI has a low refractive index (≈1.8) at 560 nm when compared with silicon (≈4).…”

Section: Introductionmentioning

confidence: 99%

Comparison between bulk micromachined and CMOS X-ray detectors

Rocha

Schabmueller

Ramos

et al. 2004

Sensors and Actuators A: Physical

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This paper compares two X-ray detectors fabricated using two different technologies: one is based on a bulk micromachined silicon photodetector and the other is based on a standard CMOS photodetector. The working principle of the two detectors is similar: a scintillating layer of CsI:Tl is placed above the photodetector, so the X-rays are first converted into visible light (560 nm) which is then converted into an electrical signal by the photodetector. The different aspects of the fabrication and the experimental results of both X-ray detectors are presented and discussed.

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“…Without the aluminum walls, the spatial resolution of the X-ray detectors is identical to the scintillator thickness [1], so one can expect a blur diameter of approximately 800 m. By using the aluminum walls, each pixel spans a 540 m × 540 m area (400 m covered with scintillator plus 140 m for the aluminum walls). Therefore, the lateral spread of light is confined within approximately 58% of the blur area without the aluminum walls.…”

Section: System Designmentioning

confidence: 99%

“…1(b) [1]. In this case, the light yield by each scintillator is guided to the corresponding CCD area by the reflective layers.…”

Section: Introductionmentioning

confidence: 99%

CMOS X-rays detector array based on scintillating light guides

Rocha

Ramos

Lanceros‐Méndez

et al. 2004

Sensors and Actuators A: Physical

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This paper describes a pixel imaging array consisting in 400 m × 400 m photodiodes fabricated in CMOS technology. An array of scintillating CsI:Tl crystals is placed above the photodiodes. These crystals are encapsulated in aluminum walls, forming a light path that guides the visible light produced by the scintillating crystal into the photodiodes. In this way, the X-ray energy is first converted into visible light which is then detected by the photodiode at the end of each light guide. The scintillator is 800 m thick, absorbing almost all 20 keV X-ray photons. Usually, the spatial resolution of the scintillating X-ray detectors is identical to the scintillator thickness. By using the light guides, the scintillator thickness can be increased without decreasing the spatial resolution. The increase of the scintillator thickness is desirable in order to increase the X-rays absorption efficiency. Tests carried out on the system show very promising results near 20 keV.

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An X-ray imaging pixel detector based on a scintillating guides screen

Cited by 36 publications

References 8 publications

Improvement of the sensitivity and spatial resolution of pixelated CsI:Tl scintillator with reflective coating

Improvement of the sensitivity and spatial resolution of pixelated CsI:Tl scintillator with reflective coating

Comparison between bulk micromachined and CMOS X-ray detectors

CMOS X-rays detector array based on scintillating light guides

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