Last edited by Vokinos
Tuesday, July 21, 2020 | History

2 edition of Digital radiology using active matrix readout of amorphous selenium. found in the catalog.

Digital radiology using active matrix readout of amorphous selenium.

Wei Zhao

Digital radiology using active matrix readout of amorphous selenium.

by Wei Zhao

  • 338 Want to read
  • 11 Currently reading

Published .
Written in English


The Physical Object
Pagination189 leaves.
Number of Pages189
ID Numbers
Open LibraryOL19589090M
ISBN 100612354504

W. Zhao and J. A. Rowlands, “Digital Radiology Using Active Matrix Readout of Amorphous Selenium: Theoretical Analysis of Detective Quantum Efficiency”, Med. Phys. 24, (). doi/ One type of flat panel radiation imaging system includes a thick amorphous selenium (a-Se) film on an array of pixels such as that described in the article entitled Flat Panel Detector for Digital Radiology Using Active Matrix readout of Amorphous Selenium, by W. Zhao et al., Medical Imag SPIE Conference, SPIE , February

A flat panel x-ray imager exhibiting reduced ghosting effects and overvoltage protection by appropriate leakage current characteristics of the thin-film transistor array. A top electrode of a suitable material is directly on and in physical and electrical contact with an amorphous selenium-based charge generator layer, thereby reducing ghosting. Digital radiology using active matrix readout of amorphous selenium: theoretical analysis of detective quantum efficiency. Wei Zhao, John A. Rowlands Physics, Medicine, Materials Science.

  Previous work in high voltage amorphous silicon (a-Si) TFTs (HVTFTs) using an n + μC–Si ohmic contact layer demonstrated that the soft contact TFT (SCTFT) design was a requirement for high voltage operation. In this research, conventional and high voltage TFT designs including the SCTFT are presented using an n + a-Si contact layer. TFT ON-current measurements and series resistance. A direct conversion digital x-ray detector is provided with inherent high voltage protection for static and dynamic imaging. The detector has an n-channel active matrix TFT array, a coplanar photoconductor structure and a high voltage biasing electrode. In order to achieve high voltage protection, the biasing electrode is set to a negative potential and the TFT “off” gate voltage is set to.


Share this book
You might also like
Designated survivor

Designated survivor

The gravel ponds

The gravel ponds

Scriptural interpretation in the Fathers

Scriptural interpretation in the Fathers

El ambiente: male homosexual social life in Mexico City.

El ambiente: male homosexual social life in Mexico City.

The pioneer ramblers 1850-1940

The pioneer ramblers 1850-1940

Decorative Cosmetics (A Formulary of Cosmetic Preparations)

Decorative Cosmetics (A Formulary of Cosmetic Preparations)

My Brown Bear Barney

My Brown Bear Barney

Cottonseed oil futures.

Cottonseed oil futures.

Coping with postnatal depression

Coping with postnatal depression

Canada-United States Relations

Canada-United States Relations

Mother, madonna, whore

Mother, madonna, whore

A Protestant prentices loyal advice to all his fellow-apprentices in and about London

A Protestant prentices loyal advice to all his fellow-apprentices in and about London

Handbook

Handbook

Digital radiology using active matrix readout of amorphous selenium by Wei Zhao Download PDF EPUB FB2

A flat‐panel x‐ray imaging detector using a layer of amorphous selenium (‐Se) for direct conversion of x rays (to charge) and an active matrix for self‐scanned readout is being investigated for digital radiology.A theoretical analysis of the spatial frequency dependent detective quantum efficiency of the self‐scanned ‐Se detector is performed based on a model of signal and noise Cited by: It consists of a thin layer of amorphous selenium that converts x rays directly to an electric charge and a thin-film electronic circuit, or active matrix, to read out the electronic signal directly to a computer host.

The advantages of amorphous selenium include Cited by: A large area, flat panel solid state detector is being investigated for both digital radiography and fluoroscopy.

The detector employs amorphous selenium (a-Se) to detect x- rays. The charge image formed on the surface of the a-Se is read out in situ using an active matrix by:   Digital radiology using active matrix readout of amorphous selenium: construction and evaluation of a prototype real-time detector.

flat-panel solid-state detector for both digital radiography and fluoroscopy. The proposed detector employs a photoconductive layer of amorphous selenium (a-Se) to convert x rays into charge.

Cited by: It consists of a thin layer of amorphous selenium that converts x rays directly to an electric charge and a thin-film electronic circuit, or active matrix, to read out the electronic signal. The charge image formed on the a-Se is electronically read out in situ using a two dimensional array of thin film transistors (TFTs), or 'active matrix.' Since the active matrix readout is capable of producing x-ray images in real- time, it can potentially be applied in both radiography and fluoroscopy.

Zhao W. and Rowlands J. A., “ Digital radiology using active matrix readout of amorphous selenium: Theoretical analysis of detective quantum efficiency,” Med. Phys. 24, – ()/ Wei Zhao and John A. Rowlands "Digital radiology using self-scanned readout of amorphous selenium", Proc.

SPIEMedical Imaging Physics of Medical Imaging, Digital radiology using amorphous selenium and active matrix flat panel Proceedings of SPIE (July 24 ). Directly behind the scintillator layer is an amorphous silicon detector array manufactured using a process very similar to that used to make LCD televisions and computer monitors.

Like a TFT-LCD display, millions of roughly mm pixels each containing a thin-film transistor form a grid patterned in amorphous silicon on the glass substrate. Zhao W, Belvis I, German S, Rowlands JA, Waechter D, Huang, Z () Digital radiology using active matrix readout of amorphous selenium: Construction and evaluation of a projection real-time detector.

Med Phys. – CrossRef PubMed Google Scholar. Zhao W, Blevis I, Germann S, Rowlands J A, Waechter D and Huang Z Digital radiology using active matrix readout of amorphous selenium: construction and evaluation of a prototype real-time detector Med.

Phys. 24 Crossref PubMed. Digital radiography. With digital radiography no cassettes are used. The x-rays hit a permanently placed set of hardware, which then sends the digital information directly to a readout mechanism.

Indirect DR: x-ray photons hit a scintillator layer, which then releases light photons that then hit an active matrix array that digitises the signal. A large area, flat panel solid state detector is being investigated for both digital radiography and fluoroscopy.

The detector employs amorphous selenium (a-Se) to detect x- rays. The charge image formed on the surface of the a-Se is read out in situ using an active matrix array. A theoretical analysis of the spatial frequency dependent detective quantum efficiency (DQE) is performed.

This book has been cited by the following publications. Germann, S., and Rowlands, J., “ Digital radiology using active matrix readout amorphous selenium: construction and evaluation of a prototype real-time detector,” J.

Med Pixel architectures for digital imaging using amorphous silicon technology, Ph.D. Thesis, University of. Zhao and J. Rowlands, "Digital Radiology Using Active Matrix Readout of Amorphous Selenium: Theoretical Analysis of Detective Quantum Efficiency", Med.

Phys. 24, ().doi/ Use amorphous selenium (electron emitting material) and are sometimes referred to as direct radiography systems (DR). Flat panel detectors - describe both indirect amorphous silicon and the direct amorphous selenium plates used in some digital systems.

Both use TFTs. Digital radiology using active matrix readout of amorphous selenium: geometrical and effective fill factors. Pang G(1), Zhao W, Rowlands JA. Author information: (1)Department of Medical Biophysics, University of Toronto, Sunnybrook Health Science Centre, by: Amorphous silicon active pixel sensor readout circuit for digital imaging Article (PDF Available) in IEEE Transactions on Electron Devices 50(1) - February with Reads.

Digital radiology using active matrix readout of amorphous selenium: theoretical analysis of detective quantum efficiency. Med Phys ; Crossref, Medline, Google Scholar; 4 Spahn M, Strotzer M, Volk M, et al. Digital radiography with a large-area, amorphous-silicon, flat-panel x-ray detector system.

Invest Radiol ;   The flat-panel detector has a radiation-conversion material or photoconductor, typically made of amorphous selenium (a-Se) that is about µm thick for radiography and to µm thick for mammography.

This material absorbs x-rays and converts them to electrons, which are stored in the TFT detectors. The TFT is a photosensitive array. A new amorphous selenium (a- Se) digital radiography detector is introduced. The proposed detector generates a charge image in the a- Se layer in a conventional manner, which is stored on electrode pixels at the surface of the a- Se layer.

A novel method, called photoconductively activated switch (PAS), is used to read out the latent x-ray charge image. The PAS readout method uses .We are developing a large area, flat panel solid-state detector for general application to digital radiology. The proposed detector employs a continuous photoconductive layer of amorphous selenium ((alpha) -Se) to convert incident x rays to electron-hole pairs, which are then separated and drawn to the surface of the (alpha) -Se by an applied electric field.Digital radiology using active matrix readout of amorphous selenium: theoretical analysis of detective quantum efficiency.

Zhao W, Rowlands JA Med Phys, (12)