Dr. Mohammad Yeke Yazdandoost Profile

Dr. Mohammad Yeke Yazdandoost

Sensing System Architect

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Publications (9)

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

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Proceedings Article | 17 March 2011 Paper

Photon quantum shot noise limited array in amorphous silicon technology for protein crystallography applications

Mohammad Yazdandoost, K. Wang, Karim Karim

Proceedings Volume 7961, 79614O (2011) https://doi.org/10.1117/12.878118

KEYWORDS: Proteins, Crystallography, Amorphous silicon, Photonic crystals, Sensors, X-rays, CMOS technology, X-ray detectors, Signal detection, Oscillators

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An array of ring voltage controlled oscillators (RVCO) aiming for photon quantum shot noise limited applications such as protein crystallography is presented. The pixilated array consists of 24 by 21 RVCO pixels. RVCO pixel converts x-ray generated input charge into an output oscillating frequency signal. This architecture can be used in both direct and indirect detection schemes. In this paper the direct detection using a layer of amorphous selenium (a-Se) coupled with the RVCO array is proposed. Theoretical and Experimental results for an in-house fabricated array of RVCOs in amorphous silicon (a-Si) technology are presented. All different requirements for protein crystallography application are listed in this paper and also the way this array addresses each of these requirements is discussed in details in this paper. The off-panel readout circuitry, designed and implemented in-house, is given in this paper. The off-panel readout circuits play an important role in the imaging applications using frequency based pixels. They have to be optimized in order to reduce the fixed pattern noise and fringing effects in an imaging array containing many such RVCO pixels. Since the frequency of oscillation of each of these pixels is in the range of 100 KHz, there is no antenna effect in the array. Antenna effect becomes an important issue in other technologies such as poly silicon (poly-Si) and CMOS technologies due to higher frequency of oscillation ranges (more than 100 MHz). Noise estimations, stability simulations and measurements for some randomly selected pixels in the array for the fabricated RVCO array are presented. The reported architecture is particularly promising for large area photon quantum shot noise applications, specifically protein crystallography. However, this architecture can be used for low dose fluoroscopy, dental computed tomography (CT) and other large area imaging applications limited by input referred electronic noise due to its very low input referred electronic noise, high sensitivity and ease of fabrication in low cost a-Si technology.

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

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Proceedings Article | 23 March 2010 Paper

Performance of a prototype amorphous silicon active pixel sensor array using a-Se for direct x-ray conversion

M. Izadi, O. Tousignant, M. Mokam, M. Yazdandoost, N. Safavian, H. Mani, L. Laperriere, K. Karim

Proceedings Volume 7622, 76223V (2010) https://doi.org/10.1117/12.845528

KEYWORDS: X-rays, Sensors, Imaging systems, Amorphous silicon, Signal to noise ratio, Prototyping, X-ray imaging, Amplifiers, Modulation transfer functions, Active sensors

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Proceedings Article | 23 March 2010 Paper

Electronic noise comparison of amorphous silicon current mode and voltage mode active pixel sensors for large area digital x-ray imaging

Dali Wu, Nader Safavian, Mohammad Yazdandoost, Mohammad Hadi Izadi, Karim Karim

Proceedings Volume 7622, 76223Q (2010) https://doi.org/10.1117/12.845561

KEYWORDS: Amorphous silicon, Amplifiers, Sensors, Interference (communication), Active sensors, Transistors, Capacitance, Capacitors, Electrons, Surgery

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Proceedings Article | 22 March 2010 Paper

Investigation of gain non-uniformities in the two TFT current programmed amorphous silicon active pixel sensor for fluoroscopy, chest radiography, and mammography tomosynthesis applications

Nader Safavian, M. Yazdandoost, D. Wu, M. Izadi, K. Karim, J. Rowlands

Proceedings Volume 7622, 76221N (2010) https://doi.org/10.1117/12.845592

KEYWORDS: Amplifiers, Fluoroscopy, Sensors, X-rays, Amorphous silicon, Active sensors, Temperature metrology, Mammography, Computer programming, Chest

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Proceedings Article | 22 March 2010 Paper

Pixel electronic noise as a function of position in an active matrix flat panel imaging array

Mohammad Yazdandoost, Dali Wu, Karim Karim

Proceedings Volume 7622, 76221L (2010) https://doi.org/10.1117/12.844259

KEYWORDS: Signal to noise ratio, Sensors, Imaging arrays, Active sensors, Californium, Prototyping, Computer simulations, Switches, Amplifiers, Medical imaging

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Proceedings Article | 19 March 2010 Paper

Photon counting pixel and array in amorphous silicon technology for large area digital medical imaging applications

Mohammad Yazdandoost, Kyung Shin, Nader Safavian, Farhad Taghibakhsh, Karim Karim

Proceedings Volume 7622, 76221A (2010) https://doi.org/10.1117/12.844420

KEYWORDS: Amorphous silicon, Sensors, Transistors, Oscillators, Photon counting, Medical imaging applications, X-rays, Medical imaging, Capacitors, Computer architecture

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Proceedings Article | 13 March 2009 Paper

Characterization of current programmed amorphous silicon active pixel sensor readout circuit for dual mode diagnostic digital x-ray imaging

Nader Safavian, M. Yazdandoost, D. Wu, A. Sultana, M. Izadi, K. Karim, A. Nathan, J. Rowlands

Proceedings Volume 7258, 725815 (2009) https://doi.org/10.1117/12.813886

KEYWORDS: Computer programming, X-rays, Sensors, Amorphous silicon, Imaging systems, Capacitors, Capacitance, Active sensors, Transistors, Signal to noise ratio

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Showing 5 of 9 publications

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