Active Pixel TFT Arrays for Digital Fluoroscopy in a-Si:H Technology

2005 ◽  
Vol 862 ◽  
Author(s):  
Jackson Lai ◽  
Nader Safavian ◽  
Arokia Nathan ◽  
John A. Rowlands
Keyword(s):  
High Speed ◽  
Dynamic Imaging ◽  
Large Area ◽  
X Ray Imaging ◽  
Active Pixel ◽  
Major Development ◽  
High Uniformity ◽  
Temperature Deposition ◽  
Hydrogenated Amorphous

AbstractMajor development challenges in application of hydrogenated amorphous silicon (a-Si:H) technology to large area digital X-ray imaging and technological attributes such as low temperature deposition and high uniformity over large area evolve around dynamic imaging modalities such as fluoroscopy, which demands both high speed readout and signal amplification capabilities in addition to long term device stability. This work reports on initial results of a variety of TFT active pixel sensor (APS) structures in a-Si:H technology, each demonstrating unique capabilities such as enhancements in signal gain, TFT threshold voltage immunity, and real-time high speed readout.

Modeling and Characterization of the Hydrogenated Amorphous Silicon Metal Insulator Semiconductor Photosensors for Digital Radiography

2007 ◽  
Vol 989 ◽  
Author(s):  
Nader Safavian ◽  
Y. Vygranenko ◽  
J. Chang ◽  
Kyung Ho Kim ◽  
J. Lai ◽  
...  
Keyword(s):  
Amorphous Silicon ◽  
Spectral Response ◽  
Large Area ◽  
Metal Insulator ◽  
Active Matrix ◽  
High Uniformity ◽  
Measurement Results ◽  
Temperature Deposition ◽  
Hydrogenated Amorphous

AbstractBecause of the inherent desired material and technological attributes such as low temperature deposition and high uniformity over large area, the amorphous silicon (a-Si:H) technology has been extended to digital X-ray diagnostic imaging applications. This paper reports on design, fabrication, and characterization of a MIS-type photosensor that is fully process-compatible with the active matrix a-Si:H TFT backplane. We discuss the device operating principles, along with measurement results of the transient dark current, linearity and spectral response.

scholarly journals High Speed, High Resolution and Large Area X-ray Imaging Using Silicon Drift Detectors

2011 ◽  
Vol 17 (S2) ◽  
pp. 892-893 ◽  
Author(s):  
R Terborg ◽  
J Berlin ◽  
T Salge
Keyword(s):  
High Resolution ◽  
High Speed ◽  
Large Area ◽  
X Ray ◽  
X Ray Imaging ◽  
Silicon Drift Detectors ◽  
Area X

Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.

High Performance Input Scanning Arrays Using Amorphous Silicon Photodiodesand Thin-Film Transistors

1992 ◽  
Vol 258 ◽  
Author(s):  
Richard L. Weisfield
Keyword(s):  
Thin Film ◽  
Amorphous Silicon ◽  
Thin Film Transistors ◽  
High Speed ◽  
High Performance ◽  
Test Results ◽  
Large Area ◽  
Full Page ◽  
Hydrogenated Amorphous ◽  
Low Capacitance

ABSTRACTThe use of large area hydrogenated amorphous silicon (a-Si:H) technology has enabled compact, full page width scanners to be built inexpensively, and is now the dominant method for fabricating low-end facsimile machines. This technology has now been extended to scanners with considerably higher levels of performance. High speed, high resolution, full-width input scanning arrays have been developed using a-Si:H photodiodes and thin-film transistors (TFTs). A 12” long array has been designed to scan 3 colors at 400 spots per inch, and operates at speeds of up to 40 pages per minute, achieving a signal/noise ratio of 400:1 at intensities of 30 μWcm-2.The color scan array is made using 3 rows of a-Si:H photodiodes, one per color, addressed by TFTs which share sets of common data lines. The data lines are arranged in a low capacitance non-crossing configuration which allows the scanner to achieve high responsivity with low crosstalk. The data lines are connected to a number of readout chips, each of which amplifies and multiplexes the photosignals onto a single video output line. Optoelectronic test results and images obtained from this device will be presented. These results indicate that high quality color images can be obtained from a-Si:H scanners, and that the present scanner is more limited by the speed of the readout chips than by the a-Si: H devices themselves.

Saskatchewan Highways and Transportation Reduced Tire Pressure Initiative

1997 ◽  
Vol 1589 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Thomas L. Davies ◽  
Tami F. Wall ◽  
Allan Carpentier
Keyword(s):  
High Speed ◽  
Membrane Surface ◽  
Vehicle Stability ◽  
Road Maintenance ◽  
Long Term Effects ◽  
Tire Pressure ◽  
Reduced Pressure ◽  
Maintenance Costs ◽  
Short And Long Term

After examination of the research carried out by other agencies, Saskatchewan Highways and Transportation (SHT) embarked on an initiative to adapt low tire pressure technologies to the province's needs and environment. The focus of the initiative was to explore several technical questions from SHT's perspective: (a) Can low tire pressures be used to increase truck weights from secondary to primary without increasing road maintenance costs on thin membrane surface roads? (b) What are the short- and long-term effects of tire heating under high-speed/high-deflection constant reduced pressure (CRP) operations in a Saskatchewan environment? (c) What effects do lower tire pressures have on vehicle stability at highway speeds? To date, significant opportunities have been noted on local hauls (less than 30 min loaded at highway speeds) for CRP operation and long primary highway hauls that begin or end in relatively short secondary highway sections that limit vehicle weight allowed for the whole trip for central tire inflation technology. The background and environment for the initiative and the investigations and demonstrations envisioned and undertaken are briefly outlined.

Mechanical failure of the Mobi-C implant for artificial cervical disc replacement: report of 4 cases

2020 ◽  
Vol 33 (6) ◽  
pp. 727-733
Author(s):  
Jasmine A. T. DiCesare ◽  
Alexander M. Tucker ◽  
Irene Say ◽  
Kunal Patel ◽  
Todd H. Lanman ◽  
...  
Keyword(s):  
Cervical Spondylosis ◽  
Case Series ◽  
Dynamic Imaging ◽  
Disc Replacement ◽  
Cervical Disc ◽  
Artificial Disc ◽  
Younger Patients ◽  
Cervical Disc Replacement ◽  
Short And Long Term

Cervical spondylosis is one of the most commonly treated conditions in neurosurgery. Increasingly, cervical disc replacement (CDR) has become an alternative to traditional arthrodesis, particularly when treating younger patients. Thus, surgeons continue to gain a greater understanding of short- and long-term complications of arthroplasty. Here, the authors present a series of 4 patients initially treated with Mobi-C artificial disc implants who developed postoperative neck pain. Dynamic imaging revealed segmental kyphosis at the level of the implant. All implants were locked in the flexion position, and all patients required reoperation. This is the first reported case series of symptomatic segmental kyphosis after CDR.

scholarly journals Characterization of Highly Irradiated ALPIDE Silicon Sensors

Universe ◽  
2019 ◽  
Vol 5 (4) ◽  
pp. 91
Author(s):  
Valentina Raskina ◽  
Filip Křížek
Keyword(s):  
Nuclear Physics ◽  
Detection Efficiency ◽  
Tracking System ◽  
Physics Institute ◽  
Total Ionization ◽  
Silicon Sensors ◽  
Active Pixel ◽  
Academy Of Sciences

The ALICE (A Large Ion Collider Experiment) experiment at CERN will upgrade its Inner Tracking System (ITS) detector. The new ITS will consist of seven coaxial cylindrical layers of ALPIDE silicon sensors which are based on Monolithic Active Pixel Sensor (MAPS) technology. We have studied the radiation hardness of ALPIDE sensors using a 30 MeV proton beam provided by the cyclotron U-120M of the Nuclear Physics Institute of the Czech Academy of Sciences in Řež. In this paper, these long-term measurements will be described. After being irradiated up to the total ionization dose 2.7 Mrad and non-ionizing energy loss 2.7 × 10 13 1 MeV n eq · cm - 2 , ALPIDE sensors fulfill ITS upgrade project technical design requirements in terms of detection efficiency and fake-hit rate.

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