Dr. Bipin Singh Profile

Dr. Bipin Singh

Chief Scientist at Radiation Monitoring Devices Inc

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Author

Publications (13)

Proceedings Article | 2 April 2024 Presentation + Paper

Perovskite Cs3Cu2I5 thin film for high-resolution x-ray imaging

Pijush Bhattacharya, Bipin Singh, Jun Wang, Vivek Nagarkar

Proceedings Volume 12930, 1293016 (2024) https://doi.org/10.1117/12.3006869

KEYWORDS: X-ray imaging, X-rays, Film thickness, Thin films, Scintillators, Polymers, Perovskite, Composites, Polymer thin films, Modulation transfer functions

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Proceedings Article | 16 March 2020 Presentation + Paper

Pixelated columnar CsI:Tl scintillator for high resolution radiography and cone-beam CT

Stuart Miller, Bipin Singh, Matthew S. Marshall, Conner Brown, Niral Sheth, Gengxin Shi, Jeffrey Siewerdsen, Wojciech Zbijewski, Vivek Nagarkar

Proceedings Volume 11312, 1131212 (2020) https://doi.org/10.1117/12.2550196

KEYWORDS: Scintillators, Bone, Spatial resolution, Sensors, Image resolution, Atomic layer deposition, CMOS sensors, Radiography

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Microcolumnar CsI:Tl scintillator screens have been the gold standard in X-ray imaging for many years due to their high density, high atomic number, and scintillation efficiency. The structured screens provide an improvement in performance by channeling the light to the detector, improving detection efficiency and spatial resolution. We have taken this concept a step further by laser-machining the CsI:Tl scintillator to provide pixels that match the detector pixels. This allows for still thicker CsI:Tl layers up to 700 μm pixelated with pitch of 100 μm to match CMOS flat panel pixels, thus improving X-ray absorption and resolution. We are investigating the applications of CMOS detectors with pixelated scintillators for imaging of bone microarchitecture on diagnostic Cone Beam CT (CBCT) systems to provide improved quantitative metrics for diagnosis of osteoporosis and osteoarthritis.

The scintillator design includes reflective coatings applied to the laser-cut grooves to improve optical isolation between pixels. Such coatings are created by atomic layer deposition (ALD), a unique approach, which permits formation of reflectors over inter-pixel grooves with aspect ratios as high as 140:1. Here we present initial results quantifying performance gains in CMOS detector resolution and their impact on the quality of bone microstructure segmentation. We demonstrate 77% gain in spatial resolution at 2 lp/mm and extension of the limiting resolution from 3 lp/mm to 4.5 lp/mm for the CMOS detector with a pixelated screen compared to a commercial sensor. In a bench-top CBCT study emulating diagnostic systems for orthopedic applications (extremity CBCT), we achieved >0.75 correlations in metrics of trabecular microarchitecture between pixelated CsI:Tl based CBCT and gold-standard micro-CT. The pixelated scintillator is expected to have significant impact for many other applications including mammography and digital radiography, where resolution and dose efficiency (DQE) of the detector are of critical importance.

Proceedings Article | 12 May 2016 Paper

High frame-rate real-time x-ray imaging of in situ high-velocity rifle bullets

Lawrence D'Aries, Stuart Miller, Rob Robertson, Bipin Singh, Vivek Nagarkar

Proceedings Volume 9847, 98470G (2016) https://doi.org/10.1117/12.2220783

KEYWORDS: Imaging systems, X-ray sources, X-ray imaging, Scintillators, X-rays, Cameras, Sensors, Firearms, Photons, Image acquisition

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Proceedings Article | 26 September 2013 Paper

Laser pixelation of thick scintillators for medical imaging applications: x-ray studies

Hamid Sabet, Haris Kudrolli, Zsolt Marton, Bipin Singh, Vivek Nagarkar

Proceedings Volume 8853, 88530B (2013) https://doi.org/10.1117/12.2029778

KEYWORDS: Scintillators, Crystals, Scintillation, Spatial resolution, Sensors, X-rays, Laser optics, Positron emission tomography, Laser ablation, Laser crystals

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Proceedings Article | 6 March 2013 Paper

High performance microstructured Lu2O3:Eu thin film scintillator for X-ray computed tomography

Zsolt Marton, Harish Bhandari, Charles Brecher, Stuart Miller, Bipin Singh, Vivek Nagarkar

Proceedings Volume 8668, 86683T (2013) https://doi.org/10.1117/12.2007906

KEYWORDS: Scintillators, Spatial resolution, X-rays, X-ray computed tomography, Sensors, Hard x-rays, Quantum efficiency, CCD cameras, Thin films, Charge-coupled devices

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Proceedings Article | 17 March 2011 Paper

Novel synthesis of large area ZnTe:O films for high-resolution imaging applications

Vivek Nagarkar, Bipin Singh, Valeriy Gaysinskiy, Stuart Miller, Vladimir Gelfandbein, Harish Bhandari, Michael Squillante

Proceedings Volume 7961, 79610N (2011) https://doi.org/10.1117/12.878286

KEYWORDS: Scintillators, X-rays, X-ray imaging, Zinc oxide, Molecules, Charge-coupled devices, Quartz, Oxygen, Scanning electron microscopy, Zinc

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Proceedings Article | 16 March 2011 Paper

A preclinical SPECT camera with depth-of-interaction compensation using a focused-cut scintillator

Fares Alhassen, Haris Kudrolli, Bipin Singh, Sangtaek Kim, Youngho Seo, Robert Gould, Vivek Nagarkar

Proceedings Volume 7961, 796121 (2011) https://doi.org/10.1117/12.878324

KEYWORDS: Scintillators, Single photon emission computed tomography, Collimators, Cameras, Gamma radiation, Coded apertures, Imaging systems, Sensors, Electron multiplying charge coupled devices, Image resolution

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Proceedings Article | 12 September 2009 Paper

Characterization of vapor-deposited Lu[sub]2[/sub]O[sub]3[/sub]:Eu[sup]3+[/sup] scintillator for x-ray imaging applications

Vivek Nagarkar, S. Topping, S. Miller, B. Singh, C. Brecher, V. Sarin

Proceedings Volume 7450, 745003 (2009) https://doi.org/10.1117/12.831031

KEYWORDS: Coating, Chemical vapor deposition, Lutetium, Sputter deposition, Scintillators, Oxides, Ceramics, Europium, Carbon dioxide, Absorption

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Proceedings Article | 12 September 2009 Paper

Development of microcolumnar LaBr[sub]3[/sub]:Ce scintillator

Vivek Nagarkar, Stuart Miller, Bipin Singh, Samta Thacker, Valeriy Gaysinskiy, Brian Miller, H. Bradford Barber, Donald Wilson

Proceedings Volume 7450, 745006 (2009) https://doi.org/10.1117/12.831053

KEYWORDS: Scintillators, Sensors, Spatial resolution, Single photon emission computed tomography, Crystals, Image intensifiers, X-rays, Fiber optics, Gamma radiation, Cameras

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Proceedings Article | 24 April 2008 Paper

A modular high precision digital system for hypervelocity projectile performance measurements

Vivek Nagarkar, Bipin Singh, Stuart Miller, Larry Campbell, Ron Bishel, Rick Rushing

Proceedings Volume 6978, 697808 (2008) https://doi.org/10.1117/12.779070

KEYWORDS: Imaging systems, Calibration, Prototyping, X-ray imaging, X-ray sources, Cameras, Image analysis, Scintillators, 3D image processing, Electron multiplying charge coupled devices

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Proceedings Article | 2 March 2006 Paper

Single-photon spatial and energy resolution enhancement of a columnar CsI(Tl)/EMCCD gamma-camera using maximum-likelihood estimation

Brian Miller, H. Bradford Barber, Harrison Barrett, Irina Shestakova, Bipin Singh, Vivek Nagarkar

Proceedings Volume 6142, 61421T (2006) https://doi.org/10.1117/12.652650

KEYWORDS: Spatial resolution, Gamma radiation, Electron multiplying charge coupled devices, Calibration, Sensors, Scintillators, X-rays, Crystals, Cameras, Fiber optics

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Proceedings Article | 24 March 2000 Paper

Novel technique for characterizing integrated optical waveguides

Jefferson Odhner, Bipin Singh, Joung Ha

Proceedings Volume 3936, (2000) https://doi.org/10.1117/12.379936

KEYWORDS: Waveguides, Integrated optics, Sensors, Glasses, Ions, Microscopes, Ion exchange, Semiconducting wafers, Diffraction, Helium neon lasers

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Proceedings Article | 1 February 1992 Paper

Development of a process simulator for optical waveguide fabrication by ion exchange in glass

Sushila Singh, Bipin Singh, Arvind Shaligram

Proceedings Volume 1523, (1992) https://doi.org/10.1117/12.57031

KEYWORDS: Waveguides, Device simulation, Glasses, Optical simulations, Refractive index, Data modeling, Ion exchange, Integrated optics, Instrument modeling, Optoelectronic devices

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Showing 5 of 13 publications

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