Transient Response Of A 3Tft Hybrid Activepassive Pixel With Correlated Double Sampling Cmos Readout Circuit For Realtime Medical Xray Imaging

• doi: 10.1109/MNRC.2008.4683384
• title: Transient response of a 3-TFT hybrid active-passive pixel with correlated double sampling CMOS readout circuit for real-time medical X-ray imaging
• publisher: IEEE
• isbn: 978-1-4244-2921-9
• issn:
• partnum: 08EX2579
• rank: 3889
• access_type: LOCKED
• content_type: Conferences
• abstract: This paper presents a new hybrid current-programmed, current-output active pixel sensor (APS) suitable for real time x-ray imaging (fluoroscopy) and an off-panel CMOS readout circuit. The pixel circuit is designed using hydrogenated amorphous silicon (a-Si:H) thin film transistor (TFT) technology. Measurement based simulations show that the proposed pixel circuit can successfully compensate for characteristic variations (e.g. mobility and threshold voltage shift) in a-Si:H TFTs under prolonged gate voltage stress. Investigation of the APS transient response shows that the proposed circuit can fulfill the timing requirement of real time imaging. The readout circuit exploits correlated double sampling (CDS) technique to reduce the offset current, low frequency noise and fixed-pattern noise (FPN) on the array operation.
• article_number: 4683384
• pdf_url: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4683384
• html_url: https://ieeexplore.ieee.org/document/4683384/
• abstract_url: https://ieeexplore.ieee.org/document/4683384/
• publication_title: 2008 1st Microsystems and Nanoelectronics Research Conference
• conference_location: Ottawa, ON, Canada
• conference_dates: 15-15 Oct. 2008
• publication_number: 4674378
• is_number: 4683356
• publication_year: 2008
• publication_date: 15-15 Oct. 2008
• start_page: 85
• end_page: 88
• citing_paper_count: 0
• citing_patent_count: 0
• download_count: 300
• insert_date: 20081121
• index_terms:
  • ieee_terms:
    • Transient response
    • Pixel
    • Sampling methods
    • Circuits
    • Biomedical imaging
    • X-ray imaging
    • CMOS image sensors
    • Thin film transistors
    • Threshold voltage
    • Low-frequency noise
  • dynamic_index_terms:
    • Medical Imaging
    • Clinical Imaging
    • Diagnostic Imaging
    • Transient Response
    • Readout Circuit
    • Correlated Double Sampling
    • Real-time X-ray
    • Real-time X-ray Imaging
    • Medical X-ray Imaging
    • Fluoroscopy
    • Threshold Voltage
    • Low-frequency Noise
    • Threshold Voltage Shift
    • Sensor Pixel
    • Mode Of Action
    • Dynamic Range
    • Storage Capacity
    • Current Source
    • Current Regulations
    • Settling Time
    • Colonial Times
    • Flat Panel
    • Flat Panel Displays
    • Flat Screen
    • Parasitic Capacitance
    • Bias Current
    • Passive Mode
    • Current Amplifier
    • Wide Range Of Intensities
    • Digital Radiography
    • Digital X-ray
    • Portable X-ray
    • Current Driver
• isbn_formats:
  • format: CD, value: 978-1-4244-2921-9, isbnType: New-2005
  • format: Print ISBN, value: 978-1-4244-2920-2, isbnType: New-2005
• authors:
  • Author Name: N. Safavian
    Affiliation: Electrical and Computer Engineering Department, University of Waterloo, Waterloo, ONT, Canada
    Author URL: https://ieeexplore.ieee.org/author/37424679500
    ID: 37424679500
    Order: 1
    Author Affiliations:
    • Electrical and Computer Engineering Department, University of Waterloo, Waterloo, ONT, Canada
  • Author Name: D. Wu
    Affiliation: Electrical and Computer Engineering Department, University of Waterloo, Waterloo, ONT, Canada
    Author URL: https://ieeexplore.ieee.org/author/37877484800
    ID: 37877484800
    Order: 2
    Author Affiliations:
    • Electrical and Computer Engineering Department, University of Waterloo, Waterloo, ONT, Canada
  • Author Name: K. Karim
    Affiliation: Electrical and Computer Engineering Department, University of Waterloo, Waterloo, ONT, Canada
    Author URL: https://ieeexplore.ieee.org/author/37265572200
    ID: 37265572200
    Order: 3
    Author Affiliations:
    • Electrical and Computer Engineering Department, University of Waterloo, Waterloo, ONT, Canada
  • Author Name: Arokia Nathan
    Affiliation: London Center for Nanotechnology, University College London, London, UK
    Author URL: https://ieeexplore.ieee.org/author/37275134700
    ID: 37275134700
    Order: 4
    Author Affiliations:
    • London Center for Nanotechnology, University College London, London, UK

Image Sensor

• sensor_type: CMOS
• resolution: not specified
• dynamic_range: not specified
• pixel_size: not specified
• dark_current: not specified

Optical Data

• focal_length: not specified
• aperture: not specified
• field_of_view: not specified
• distortion: not specified

Performance Metrics

• frame_rate: 30 fps
• noise: less than 1 nA input referred offset currents

Applications & Benefits

• cell_imaging: The sensor can be used in medical x-ray imaging and is suitable for fluoroscopy and radiography imaging modalities.
• benefits: The hybrid 3-TFT pixel circuit allows operating in both active and passive modes, covering a wide range of incoming x-ray intensities and fulfilling timing requirements for real-time imaging.

Supporting Organizations

• supported_by: University of Waterloo, University College London

Manuscript Details

• publication_date: 15-15 Oct. 2008

Relevancy Score

• score: 8
• missing_fields:
  • resolution
  • dynamic_range
  • pixel_size
  • dark_current
  • focal_length
  • aperture
  • field_of_view
  • distortion
  • sensitivity
  • shutter_speed
  • power_consumption

Processed JSON Filename

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