Prof. Shiva Abbaszadeh Profile

Prof. Shiva Abbaszadeh

Associate Professor at Univ. of California Santa Cruz

SPIE Involvement:

Conference Program Committee | Author

Area of Expertise:

Detector Development , Medical Imaging , Nuclear Medicine

Websites:

Personal Website

Publications (31)

Proceedings Article | 1 April 2024 Poster + Paper

Synthesizing high-resolution dual-energy radiographs from coronary artery calcium CT images

Kian Shaker, Linxi Shi, Scott Hsieh, Akyl Swaby, Shiva Abbaszadeh, Adam Wang

Proceedings Volume 12925, 129253T (2024) https://doi.org/10.1117/12.3006250

KEYWORDS: Dual energy imaging, Numerical simulations, Image resolution, Super resolution, Pixel resolution, Radiography, Tissues, Calcium, Computed tomography, Arteries, Visualization, Spatial resolution, Sensors, Image segmentation, Anatomy

Read Abstract +

Proceedings Article | 1 April 2024 Poster + Paper

An alloyed a-Se-Te indirect flat panel imager for improved performance in a dual-layer x-ray detector

Kaitlin Hellier, Kellii Fusari, Paul Pryor, Ivan Mollov, Shiva Abbaszadeh

Proceedings Volume 12925, 1292537 (2024) https://doi.org/10.1117/12.3007292

KEYWORDS: Tellurium, Sensors, Alloys, Scintillators, X-ray detectors, External quantum efficiency, Imaging systems, Emission wavelengths, X-rays, Selenium

Read Abstract +

Proceedings Article | 1 April 2024 Poster + Paper

Harnessing quantum entanglement for enhanced accuracy in a prototype CZT PET system: a GATE simulation study

Gregory Romanchek, Shiva Abbaszadeh

Proceedings Volume 12925, 129254K (2024) https://doi.org/10.1117/12.3006050

KEYWORDS: Quantum entanglement, Physics, Gamma radiation, Windows, Positron emission tomography, Crystals, Compton scattering

Read Abstract +

Proceedings Article | 7 April 2023 Poster + Paper

A dual-layer direct/indirect flat panel detector for improved material decomposition: first studies of the indirect layer

Kaitlin Hellier, Ivan Mollov, Paul Pryor, Shiva Abbaszadeh

Proceedings Volume 12463, 124632E (2023) https://doi.org/10.1117/12.2653390

KEYWORDS: X-rays, X-ray detectors, X-ray imaging, Photocurrent, Polyimides, Selenium, Quantum detection, Imaging systems, Dark current, Tissues

Read Abstract +

Proceedings Article | 7 April 2023 Poster + Paper

Hybrid a-Se/RD53B CMOS detector: initial studies

Akyl Swaby, Jennifer Ott, Kaitlin Hellier, Maurice Garcia-Sciveres, Shiva Abbaszadeh

Proceedings Volume 12463, 1246341 (2023) https://doi.org/10.1117/12.2654519

KEYWORDS: CMOS sensors, Semiconductors, Readout integrated circuits, X-ray imaging, X-ray detectors, Spatial resolution, Selenium, Krypton, Fabrication, Detector arrays

Read Abstract +

Proceedings Article | 7 April 2023 Poster + Paper

Parameter selection for convex optimization time calibration for a 2-panel PET system

Gregory Romanchek, Shiva Abbaszadeh

Proceedings Volume 12463, 124633W (2023) https://doi.org/10.1117/12.2654423

KEYWORDS: Calibration, Positron emission tomography, Data modeling, Performance modeling, Mathematical optimization, Convex optimization, Education and training, Anodes, Imaging systems, Design and modelling

Read Abstract +

Proceedings Article | 3 April 2023 Poster

Quantum entanglement for identifying true coincidences in a CZT-based PET system

Emmanouil Nikolakakis, Gregory Romanchek, Emily Enlow, Shiva Abbaszadeh

Proceedings Volume 12464, 1246435 (2023) https://doi.org/10.1117/12.2654408

KEYWORDS: Positron emission tomography, Scattering, Signal processing, Sensors, Interference (communication), Entangled states, Compton scattering, Visualization, Image processing, Functional imaging

Read Abstract +

Proceedings Article | 18 October 2022 Open Access

Soil matrix study using a hybrid a-Se/CMOS pixel detector for CT scanning

Akyl Swaby, Adam Wang, Michael Farrier, Weixin Cheng, Shiva Abbaszadeh

Proceedings Volume 12304, 123041E (2022) https://doi.org/10.1117/12.2646496

KEYWORDS: Sensors, X-ray computed tomography, X-rays, Soil science, X-ray detectors, X-ray sources, X-ray imaging, Spatial resolution, Signal attenuation, Image resolution

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 4 April 2022 Presentation + Paper

Tellurium doped a-Se devices for improved optical absorption in indirect x-ray photodetection

Kaitlin Hellier, Emmie Benard, Shiva Abbaszadeh

Proceedings Volume 12031, 120310H (2022) https://doi.org/10.1117/12.2613150

KEYWORDS: Tellurium, Electrodes, Selenium, Sensors, Absorption, Chlorine, Doping

Read Abstract +

Proceedings Article | 4 April 2022 Poster + Paper

Dual-layer flat panel detector with a-Se top layer for opportunistic screening of coronary artery calcium: a simulation study

Akyl Swaby, Adam Wang, Martin Willemink, Shiva Abbaszadeh

Proceedings Volume 12031, 1203143 (2022) https://doi.org/10.1117/12.2611831

KEYWORDS: Sensors, Calcium, Arteries, X-rays, Dual energy imaging, Modulation transfer functions, X-ray imaging, Selenium, Tissues, Spatial resolution

Read Abstract +

Proceedings Article | 15 February 2021 Poster + Presentation + Paper

A deep learning approach to correctly identify the sequence of coincidences in cross-strip CZT detectors

Nahid Nasiri, Shiva Abbaszadeh

Proceedings Volume 11595, 115953W (2021) https://doi.org/10.1117/12.2582063

KEYWORDS: Sensors, Positron emission tomography, Compton scattering, Zinc, Target detection, System identification, Single photon detectors, Photodetectors, Mass attenuation coefficient, Infrared detectors

Read Abstract +

Proceedings Article | 15 February 2021 Poster + Presentation + Paper

Thickness uniformity and stability of amorphous selenium films on flexible substrates for indirect conversion x-ray detection

Maryam Farahmandzadeh, Steven Marcinko, Davide Curreli, Shiva Abbaszadeh

Proceedings Volume 11595, 115953E (2021) https://doi.org/10.1117/12.2581671

KEYWORDS: Selenium, X-rays, X-ray detectors, Crystals, Tin, Sensors, Oxides, Medical imaging applications, Indium

Read Abstract +

Proceedings Article | 15 February 2021 Presentation + Paper

Back-end readout electronic design and initial results: a head-and-neck dedicated PET system based on CZT

Yuli Wang, Ryan Herbst, Shiva Abbaszadeh

Proceedings Volume 11595, 1159510 (2021) https://doi.org/10.1117/12.2576598

KEYWORDS: Positron emission tomography, Sensors, Zinc, Spatial resolution, Data transmission, Cadmium

Read Abstract +

Proceedings Article | 13 September 2018 Presentation + Paper

Development of large-volume high-performance monolithic CZT radiation detector

Henry Chen, Handong Li, Michael Reed, Arun Sundaram, John Eger, James Hugg, Shiva Abbaszadeh, Mohan Li, Guillaume Montemont, Loick Verger, Yuefeng Zhu, Zhong He

Proceedings Volume 10762, 107620N (2018) https://doi.org/10.1117/12.2321244

KEYWORDS: Sensors, Crystals, Cameras, Single photon emission computed tomography, Imaging spectroscopy, Spectroscopy, Image resolution, Spectroscopes, Positron emission tomography, Monte Carlo methods

Read Abstract +

Proceedings Article | 13 March 2018 Paper

Automated location detection of injection site for preclinical stereotactic neurosurgery through fully convolutional network

Zheng Liu, Hemmings Wu, Shiva Abbaszadeh

Proceedings Volume 10576, 1057623 (2018) https://doi.org/10.1117/12.2293715

KEYWORDS: Image segmentation, Image processing, Skull, Brain, Data processing, Machine learning, Convolutional neural networks

Read Abstract +

Proceedings Article | 15 September 2017 Paper

Effect of cathode energy spectrum on the depth of interaction estimation and anode signal recovery in CZT detectors

Mohan Li, Shiva Abbaszadeh

Proceedings Volume 10392, 1039217 (2017) https://doi.org/10.1117/12.2275674

KEYWORDS: Electrodes, Calibration

Read Abstract +

Proceedings Article | 2 May 2017 Presentation

Towards a high sensitivity small animal PET system based on CZT detectors (Conference Presentation)

Shiva Abbaszadeh, Craig Levin

Proceedings Volume 10132, 101320C (2017) https://doi.org/10.1117/12.2254709

KEYWORDS: Imaging systems, Detector development, Visualization, Cancer, Positron emission tomography, Sensors, Cell mechanics, Target detection, Algorithm development, Imaging technologies

Read Abstract +

Proceedings Article | 3 March 2017 Paper

Automated location detection of injection site for preclinical stereotactic neurosurgery procedure

Shiva Abbaszadeh, Hemmings C. Wu

Proceedings Volume 10135, 101352D (2017) https://doi.org/10.1117/12.2254722

KEYWORDS: Brain, Skull, Robotics, Laboratory automation, Neuroscience, Pattern recognition, Digital imaging, Imaging systems, Image analysis, Plasma, Roads

Read Abstract +

SPIE Journal Paper | 12 January 2017

New-generation small animal positron emission tomography system for molecular imaging

Shiva Abbaszadeh, Craig Levin

JMI, Vol. 4, Issue 01, 011008, (January 2017) https://doi.org/10.1117/12.10.1117/1.JMI.4.1.011008

KEYWORDS: Crystals, Imaging systems, Positron emission tomography, Sensors, Spatial resolution, Electrodes, Molecular imaging, Ultraviolet radiation, Point spread functions, Electronics

Read Abstract +

Proceedings Article | 2 November 2016 Presentation

Design and optimization of a new-generation CZT-based positron emission tomography system (Conference Presentation)

Shiva Abbaszadeh, Craig Levin

Proceedings Volume 9969, 99690F (2016) https://doi.org/10.1117/12.2241734

KEYWORDS: Positron emission tomography, Sensors, Spatial resolution, Semiconductors, Crystals, Cadmium, Zinc, Visualization, Solid state electronics, Scintillation

Read Abstract +

Proceedings Article | 19 March 2014 Paper

Amorphous selenium direct detection CMOS digital x-ray imager with 25 micron pixel pitch

Christopher Scott, Shiva Abbaszadeh, Sina Ghanbarzadeh, Gary Allan, Michael Farrier, Ian Cunningham, Karim Karim

Proceedings Volume 9033, 90331G (2014) https://doi.org/10.1117/12.2043770

KEYWORDS: Modulation transfer functions, X-rays, X-ray imaging, CMOS sensors, Imaging systems, Sensors, Spatial resolution, Selenium, X-ray detectors, Gold

Read Abstract +

Proceedings Article | 29 May 2013 Paper

A microfabricated, low dark current a-Se detector for measurement of microplasma optical emission in the UV for possible use on-site

Shiva Abbaszadeh, Karim Karim, Vassili Karanassios

Proceedings Volume 8726, 87260S (2013) https://doi.org/10.1117/12.2016229

KEYWORDS: Sensors, Ultraviolet radiation, Spectroscopy, Electrodes, Fiber optics, Solid state electronics, Fiber optics sensors, Chemical analysis, Monochromators, Photons

Read Abstract +

Proceedings Article | 6 March 2013 Paper

Application of organic semiconductors in amorphous selenium based photodetectors for high performance X-ray imaging

Shiva Abbaszadeh, Zhechen Du, Nicholas Allec, Karim Karim

Proceedings Volume 8668, 86683Q (2013) https://doi.org/10.1117/12.2006705

KEYWORDS: Sensors, Electric field sensors, Photodetectors, Selenium, Organic materials, Organic semiconductors, X-ray imaging, Ionization, Electrodes, Electrons

Read Abstract +

Proceedings Article | 6 March 2013 Paper

Low dark current and high dynamic range a-Si:H MSM photodetector for large area medical imaging

Sina Ghanbarzadeh, Shiva Abbaszadeh, Michael Adachi, Karim Karim

Proceedings Volume 8668, 86683U (2013) https://doi.org/10.1117/12.2007973

KEYWORDS: Sensors, Interfaces, Photodetectors, Amorphous silicon, Silicon, High dynamic range imaging, Electrodes, Medical imaging, PIN photodiodes, Thin films

Read Abstract +

Proceedings Article | 9 March 2012 Paper

Performance of a prototype 32x32 pixel indirect x-ray imager based on a lateral selenium passive pixel sensor

Rasoul Keshavarzi, Kai Wang, Mohammad Yazdandoost, Kyung-Wook Shin, Feng Chen, Shaikh Hasibul Majid, Shiva Abbaszadeh, Karim Karim

Proceedings Volume 8313, 83135O (2012) https://doi.org/10.1117/12.912286

KEYWORDS: Sensors, Selenium, X-rays, Field programmable gate arrays, X-ray imaging, X-ray detectors, Prototyping, Signal detection, Image quality, Imaging arrays

Read Abstract +

Proceedings Article | 3 March 2012 Paper

Amorphous selenium photodetector on a flexible substrate for indirect conversion medical imaging

Shiva Abbaszadeh, Shaikh Majid, Nicholas Allec, Karim Karim

Proceedings Volume 8313, 83135X (2012) https://doi.org/10.1117/12.912288

KEYWORDS: Glasses, Selenium, Photodetectors, X-ray imaging, X-rays, Sensors, Medical imaging, Solids, X-ray detectors, Medical imaging applications

Read Abstract +

Proceedings Article | 3 March 2012 Paper

High performance amorphous selenium lateral photodetector

Shiva Abbaszadeh, Nicholas Allec, Karim Karim

Proceedings Volume 8313, 83135W (2012) https://doi.org/10.1117/12.912287

KEYWORDS: Electrodes, Photodetectors, Sensors, Selenium, Capacitance, X-ray imaging, Absorption, Image sensors, Medical imaging applications, Scintillators

Read Abstract +

Proceedings Article | 3 March 2012 Paper

Motion artifacts in dual-energy contrast-enhanced mammography

Nicholas Allec, Shiva Abbaszadeh, John Lewin, Karim Karim

Proceedings Volume 8313, 83134P (2012) https://doi.org/10.1117/12.912295

KEYWORDS: Motion models, Systems modeling, Tumors, Spatial frequencies, Mammography, Sensors, Breast, Performance modeling, Motion detection, Linear filtering

Read Abstract +

Proceedings Article | 17 March 2011 Paper

Study of gain phenomenon in lateral metal-semiconductor-metal detectors for indirect conversion medical imaging

Shiva Abbaszadeh, Nicholas Allec, Kai Wang, Feng Chen, Karim Karim

Proceedings Volume 7961, 79614P (2011) https://doi.org/10.1117/12.877860

KEYWORDS: Selenium, Sensors, External quantum efficiency, Photons, Electrodes, Medical imaging, Quantum efficiency, Measurement devices, Photoresistors, Ionization

Read Abstract +

Proceedings Article | 17 March 2011 Paper

Integration of an amorphous silicon passive pixel sensor array with a lateral amorphous selenium detector for large area indirect conversion x-ray imaging applications

Kai Wang, Mohammad Yazdandoost, Rasoul Keshavarzi, Kyung-Wook Shin, Christos Hristovski, Shiva Abbaszadeh, Feng Chen, Shaikh Hasibul Majid, Karim Karim

Proceedings Volume 7961, 79610V (2011) https://doi.org/10.1117/12.877592

KEYWORDS: Sensors, X-ray imaging, Amorphous silicon, Selenium, Blue light emitting diodes, Thin films, Capacitors, Photodetectors, Cesium, Electrodes

Read Abstract +

Proceedings Article | 16 March 2011 Paper

Analysis of multilayer and single layer X-ray detectors for contrast-enhanced mammography using imaging task

Nicholas Allec, Shiva Abbaszadeh, Karim Karim

Proceedings Volume 7961, 796111 (2011) https://doi.org/10.1117/12.877854

KEYWORDS: Sensors, Photons, Mammography, Interference (communication), Breast, Tumors, Dual energy imaging, Signal detection, Systems modeling, Selenium

Read Abstract +