Dr. Kris K. Kwiatkowski Profile

Dr. Kris K. Kwiatkowski

TSM

SPIE Involvement:

Author

Publications (10)

Proceedings Article | 25 March 2016 Paper

800-MeV magnetic-focused flash proton radiography for high-contrast imaging of low-density biologically-relevant targets using an inverse-scatter collimator

Matthew Freeman, Jason Allison, Camilo Espinoza, John Jerome Goett, Gary Hogan, Brian Hollander, Kris Kwiatkowski, Julian Lopez, Fesseha Mariam, Michael Martinez, Jason Medina, Patrick Medina, Frank Merrill, Deborah Morley, Chris Morris, Matthew Murray, Paul Nedrow, Alexander Saunders, Tamsen Schurman, Thomas Sisneros, Amy Tainter, Frans Trouw, Dale Tupa, Josh Tybo, Carl Wilde

Proceedings Volume 9783, 97831X (2016) https://doi.org/10.1117/12.2216862

KEYWORDS: Radiography, Tissues, Collimators, Magnetism, Imaging systems, Multiple scattering, Scattering, Image resolution, Computer simulations, Image guided radiation therapy, Collimation, Particles, Lenses

Read Abstract +

Proceedings Article | 19 September 2014 Paper

Ultra-fast high-resolution hybrid and monolithic CMOS imagers in multi-frame radiography

Kris Kwiatkowski, Vincent Douence, Yibin Bai, Paul Nedrow, Fesseha Mariam, Frank Merrill, Christopher Morris, Andy Saunders

Proceedings Volume 9215, 921506 (2014) https://doi.org/10.1117/12.2063941

KEYWORDS: Imaging systems, Camera shutters, Sensors, Staring arrays, Radiography, Silicon, Cameras, Pulsed laser operation, Readout integrated circuits, Quantum efficiency

Read Abstract +

Proceedings Article | 5 September 2014 Paper

Scintillator efficiency study with MeV x-rays

Stuart Baker, Kristina Brown, Alden Curtis, Stephen Lutz, Russell Howe, Robert Malone, Stephen Mitchell, Jeremy Danielson, Todd Haines, Kris Kwiatkowski

Proceedings Volume 9213, 92130H (2014) https://doi.org/10.1117/12.2064028

KEYWORDS: Scintillators, X-rays, Cameras, Imaging systems, Absorption, Signal to noise ratio, Sensors, Radiography, Radio optics, X-ray imaging

Read Abstract +

Proceedings Article | 26 September 2013 Paper

Gigahertz (GHz) hard x-ray imaging using fast scintillators

Zhehui Wang, Elena Guardincerri, D. Rathman, M. Azzouz, Cris Barnes, R. Berger, E. Bond, D. Craig, David Holtkamp, J. Kapustinsky, Alexei Klimenko, K. Kwiatkowski, R. Merl, C. Morris, J. Perry, E. Ramberg, R. Reich, A. Ronzhin, K. Warner, R. Williams, Ren-Yuan Zhu

Proceedings Volume 8852, 88521A (2013) https://doi.org/10.1117/12.2022294

KEYWORDS: Sensors, Scintillators, X-rays, Silicon, Electrons, Hard x-rays, Spatial resolution, Electronics, Particles, Zinc oxide

Read Abstract +

Proceedings Article | 19 October 2012 Paper

Proton radiography: its uses and resolution scaling

F. Mariam, F. Merrill, C. Espinoza, J. Heidemann, B. Hollander, K. Kwiatkowski, J. Lopez, R. Lopez, M. Marr-Lyon, W. McNeil, D. Morley, C. Morris, M. Murray, P. Nedrow, J. Perry, A. Saunders, A. Tainter, F. Trouw, D. Tupa

Proceedings Volume 8509, 850904 (2012) https://doi.org/10.1117/12.930569

KEYWORDS: Radiography, Cameras, Scattering, Magnetism, Sensors, Colorimetry, Imaging systems, Lenses, Collimators, Explosives

Read Abstract +

Proceedings Article | 17 March 2005 Paper

Hybrid image sensor with multiple on-chip frame storage for ultrahigh-speed imaging

Vincent Douence, Yibin Bai, Hakan Durmus, Atul Joshi, Per-Olov Pettersson, Debashish Sahoo, Kris Kwiatkowski, Nicholas King, Christopher Morris, Mark Wilke

Proceedings Volume 5580, (2005) https://doi.org/10.1117/12.567552

KEYWORDS: Readout integrated circuits, Capacitors, Imaging systems, Silicon, Sensors, Computer aided design, Cameras, Switches, Image sensors, Scintillators

Read Abstract +

Proceedings Article | 17 March 2005 Paper

A solid state streak camera

Stuart Kleinfelder, Kris Kwiatkowski, Ashish Shah

Proceedings Volume 5580, (2005) https://doi.org/10.1117/12.579370

KEYWORDS: Diodes, Photodiodes, Streak cameras, Analog electronics, Switches, Pulsed laser operation, Silicon, Solid state physics, Capacitors, Multiplexing

Read Abstract +

Proceedings Article | 6 February 2004 Paper

Four-million-frame/s CMOS image sensor prototype with on-focal-plane 64-frame storage

Stuart Kleinfelder, Yandong Chen, Kris Kwiatkowski, Ashish Shah

Proceedings Volume 5210, (2004) https://doi.org/10.1117/12.506196

KEYWORDS: Cadmium sulfide, Capacitors, Prototyping, Capacitance, CMOS sensors, Sensors, Staring arrays, Amplifiers, Compact discs, Multiplexing

Read Abstract +

Proceedings Article | 1 August 2003 Paper

Imaging detector systems for soft x-ray and proton radiography

Nicholas King, Stuart Baker, Steven Jaramillo, Kris Kwiatkowski, Stephen Lutz, Gary Hogan, Vanner Holmes, Christopher Morris, Paul Nedrow, Peter Pazuchanics, John Rohrer, Dan Sorenson, Richard Thompson

Proceedings Volume 4948, (2003) https://doi.org/10.1117/12.516915

KEYWORDS: Imaging systems, Cameras, Fiber optics, X-rays, CCD cameras, Scintillators, X-ray imaging, Radiography, Diodes, Quantum efficiency

Read Abstract +

Multi-pulse imaging systems have been developed for recording images from pulsed X-ray and proton radiographic sources. The number of successive images for x-ray radiography is limited to four being generated by 25 ns, pulsed sources in a close positioned geometry. The number of proton images are provided by the number of proton bursts (approximately 60 ns) delivered to the radiographic system. In both cases the radiation to light converter is a thin LSO crystal. The radiographic image formed is relayed by a direct, coherent bundle or lens coupling to a variety of electronic shuttered, cooled CCD cameras. The X-ray system is optimized for detecting bremmstrahlung, reflection geometry generated X-rays with end point energies below 300 keV. This has resulted in less than 200 μm thick LSO converters which are 25 x 25 mm². The converter is attached to a UV transmitting fiberoptic which in turn is directly coupled to a coherent bundle. The image is relayed to a 25 mm microchannel plate image intensifier attached to a 4 image framing camera. The framing camera image is recorded by a 1600 x 1600 pixel, cooled CCD camera. The current proton radiography imaging system for dynamic experiments is based on a system of seven individual high-resolution CCD cameras, each with its own optical relay and fast shuttering. The image of the radiographed object is formed on a 1.7 mm thick tiles of LSO scintillator. The rapid shuttering for each of the CCD's is accomplished via proximity-focussed planar diodes (PPD), which require application of 300-to-500 ns long, 12 kV pulses to the PPD from a dedicated HV pulser. The diodes are fiber-optically coupled to the front face of the CCD chips. For each time-frame a separate CCD assembly is required. The detection quantum efficiency (DQE) of the system is about 0.4. This is due to the lens coupling inefficiency, the necessary demagnification (typically between 5:1 and 3:1) in the system optics, and the planar-diode photo-cathode quantum efficiency (QE) (of approximately 15%). More recently, we have incorporated a series of 4 or 9 image framing cameras to provide an increased number of images. These have been coupled to cooled CCD cameras as readouts. A detailed description of the x-ray and proton radiographic imaging systems are discussed as well as observed limitations in performance. A number of improvements are also being developed which will be described.

Proceedings Article | 1 August 2003 Paper

Development of a multiframe optical imaging detector for proton radiography at LANL

Kris Kwiatkowski, Nicholas King, James Lyke, Jean-Francois Beche, Gary Hogan, Christopher Kapusta, Jacques Millaud, Christopher Morris, R. Wojnarowski

Proceedings Volume 4948, (2003) https://doi.org/10.1117/12.516916

KEYWORDS: Sensors, Imaging systems, Electronics, Radiography, Staring arrays, Silicon, Image sensors, Signal processing, Diodes, Quantum efficiency

Read Abstract +

Showing 5 of 10 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years