Energy distinction type CdTe two-dimension x-ray imaging device

2005 ◽  
Author(s):  
Daiji Furuhashi ◽  
Daisuke Sakashita ◽  
Yu Ishida ◽  
Toru Aoki ◽  
Yasuhiro Tomita ◽  
...  
Keyword(s):  
Imaging Device ◽  
X Ray ◽  
Two Dimension ◽  
X Ray Imaging

scholarly journals A Simulation of a Novel High Quantum Efficiency Scintillating Fiber Detector with Anti-scatter Properties for Megavoltage X-Ray Imaging

2021 ◽  
Author(s):  
James Day
Keyword(s):  
Spatial Resolution ◽  
Detection Efficiency ◽  
Original Design ◽  
High Quantum Efficiency ◽  
Imaging Device ◽  
X Ray ◽  
Image Guided Radiation Therapy ◽  
X Ray Imaging ◽  
High Detection Efficiency ◽  
Square Array

To further develop a MV x-ray portal imaging device with high detection efficiency and adequate spatial resolution for image guided radiation therapy, the experimental results for a prototype detector were matched using Monte-Carlo software to then improve upon the design. The simulation and experiment were carried out using a 6 MV beam from a linear accelerator machine. An adequate match was obtained with the spatial resolution matching up to a MTF value of 0.2 and then diverging and the total signal registered in the central fiber was matched for field sizes ranging from 3 cm by 3 cm to 20 cm by 20 cm for 5 cm, 15 cm and 25 cm air gaps within 3%. The design was altered from a hexagonal array of round double cladded fibers to a square array of single cladded square fibers. The spatial resolution was improved from 0.242 lp mm-1 to 0.359 lp mm-1 at an MTF value of 0.5 from the original design to a square array of square fibers 0.5 mm wide separated by 0.25 mm of lead foil. With further optimization of the detector design it may be possible to increase spatial resolution for MV x-ray imaging while maintaining an adequate detection efficiency.

scholarly journals Megavoltage X-Ray Imaging Based on Cerenkov Effect: A New Application of Optical Fibres to Radiation Therapy

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
A. Teymurazyan ◽  
G. Pang
Keyword(s):  
Optical Fibres ◽  
X Rays ◽  
Modulation Transfer ◽  
Imaging Device ◽  
Active Matrix ◽  
X Ray ◽  
X Ray Imaging ◽  
Order Of Magnitude ◽  
Detection Quantum Efficiency ◽  
Cerenkov Effect

A Monte Carlo simulation was used to study imaging and dosimetric characteristics of a novel design of megavoltage (MV) X-ray detectors for radiotherapy applications. The new design uses Cerenkov effect to convert X-ray energy absorbed in optical fibres into light for MV X-ray imaging. The proposed detector consists of a matrix of optical fibres aligned with the incident X rays and coupled to an active matrix flat-panel imager (AMFPI) for image readout. Properties, such as modulation transfer function, detection quantum efficiency (DQE), and energy response of the detector, were investigated. It has been shown that the proposed detector can have a zero-frequency DQE more than an order of magnitude higher than that of current electronic portal imaging device (EPID) systems and yet a spatial resolution comparable to that of video-based EPIDs. The proposed detector is also less sensitive to scattered X rays from patients than current EPIDs.

Quantitative evaluation of mercuric iodide and selenium for x-ray imaging device

2005 ◽  
Author(s):  
Byung-Youl Cha ◽  
Ji-Koon Park ◽  
Sang-Sik Kang ◽  
Jung-Wook Shin ◽  
Jin-Young Kim ◽  
...  
Keyword(s):  
Quantitative Evaluation ◽  
Mercuric Iodide ◽  
Imaging Device ◽  
X Ray ◽  
X Ray Imaging

Fast 2-D soft X-ray imaging device based on micro pattern gas detector

2003 ◽  
Vol 125 ◽  
pp. 332-336 ◽  
Author(s):  
D. Pacella ◽  
R. Bellazzini ◽  
A. Brez ◽  
G. Pizzicaroli
Keyword(s):  
Imaging Device ◽  
X Ray ◽  
X Ray Imaging ◽  
Gas Detector ◽  
Micro Pattern

scholarly journals A Simulation of a Novel High Quantum Efficiency Scintillating Fiber Detector with Anti-scatter Properties for Megavoltage X-Ray Imaging

2021 ◽  
Author(s):  
James Day
Keyword(s):  
Spatial Resolution ◽  
Detection Efficiency ◽  
Original Design ◽  
High Quantum Efficiency ◽  
Imaging Device ◽  
X Ray ◽  
Image Guided Radiation Therapy ◽  
X Ray Imaging ◽  
High Detection Efficiency ◽  
Square Array

To further develop a MV x-ray portal imaging device with high detection efficiency and adequate spatial resolution for image guided radiation therapy, the experimental results for a prototype detector were matched using Monte-Carlo software to then improve upon the design. The simulation and experiment were carried out using a 6 MV beam from a linear accelerator machine. An adequate match was obtained with the spatial resolution matching up to a MTF value of 0.2 and then diverging and the total signal registered in the central fiber was matched for field sizes ranging from 3 cm by 3 cm to 20 cm by 20 cm for 5 cm, 15 cm and 25 cm air gaps within 3%. The design was altered from a hexagonal array of round double cladded fibers to a square array of single cladded square fibers. The spatial resolution was improved from 0.242 lp mm-1 to 0.359 lp mm-1 at an MTF value of 0.5 from the original design to a square array of square fibers 0.5 mm wide separated by 0.25 mm of lead foil. With further optimization of the detector design it may be possible to increase spatial resolution for MV x-ray imaging while maintaining an adequate detection efficiency.

An X-ray imaging device based on a GEM detector with delay-line readout

2010 ◽  
Vol 34 (1) ◽  
pp. 78-82 ◽  
Author(s):  
Zhou Yi ◽  
Li Cheng ◽  
Sun Yong-Jie ◽  
Shao Ming
Keyword(s):  
Delay Line ◽  
Imaging Device ◽  
X Ray ◽  
X Ray Imaging ◽  
Gem Detector
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