rss
04-18-2014, 08:12 PM
Plastic Substrate X-Ray Detector to Lighten, Toughen Radiological Equipment
http://cdn.medgadget.com/wp-content/uploads/2014/04/holst-imec-xray-detector.jpgExamples of X-ray image (left) and optical image (right) obtained with Holst Centre’s X-ray detector on plastic substrate.
X-ray detectors used in medicine have a glass core that makes them fragile, heavy, and unwieldy. The future is looking lighter for X-ray detectors thanks to researchers at Holst Centre in The Netherlands, imec in Belgium, and Philips who have been working on a medical quality detector that uses*a plastic substrate.
The device provides dynamic, high-contrast images at 25 frames per second and a 200 pixels per inch resolution. The plate itself is 160 x 120 pixels in size, but could be made bigger for clinical applications.
Some details on the development of the new detector, according to the an**uncement:
In 2012, the team demonstrated the world’s first complete X-ray detector produced on a thin plastic substrate. An indirect flat panel detector (FPD), it combined a standard scintillator with a **vel organic photodiode layer and organic thin-film transistor (TFT) backplane. By using solution-processed organic semiconductor rather than the usual amorphous silicon, the team reduced process temperatures to be compatible with plastic film substrates. They also eliminated a number of costly lithography steps, opening the door to lower production costs.
**w, the same team has delivered a major breakthrough in device performance. It has reduced the photodiode leakage current (the output from the photodiodes at zero light) by a factor of 10,000, down to 10-7 mA/cm2, bringing it well within the requirements for medical detectors. This improves the signal-to-**ise ratio, and hence image quality at low radiation dose. At the same time, oxide transistors are used instead of organic transistors. The charge carrier mobility in the metal-oxide TFTs is 10-50 times higher than with amorphous silicon and organic transistors, enabling faster image acquisition.
Press release: X-ray detector on plastic delivers medical imaging performance… (http://www.holstcentre.com/en/NewsPress/PressList/PlasticXrayDetector.aspx)
http://feeds.feedburner.com/~ff/Medgadget?d=yIl2AUoC8zA (http://feeds.feedburner.com/~ff/Medgadget?a=t0w6Cb2oO70:-6cDWqibdGE:yIl2AUoC8zA) http://feeds.feedburner.com/~ff/Medgadget?d=qj6IDK7rITs (http://feeds.feedburner.com/~ff/Medgadget?a=t0w6Cb2oO70:-6cDWqibdGE:qj6IDK7rITs) http://feeds.feedburner.com/~ff/Medgadget?i=t0w6Cb2oO70:-6cDWqibdGE:gIN9vFwOqvQ (http://feeds.feedburner.com/~ff/Medgadget?a=t0w6Cb2oO70:-6cDWqibdGE:gIN9vFwOqvQ)
http://feeds.feedburner.com/~r/Medgadget/~4/t0w6Cb2oO70
http://cdn.medgadget.com/wp-content/uploads/2014/04/holst-imec-xray-detector.jpgExamples of X-ray image (left) and optical image (right) obtained with Holst Centre’s X-ray detector on plastic substrate.
X-ray detectors used in medicine have a glass core that makes them fragile, heavy, and unwieldy. The future is looking lighter for X-ray detectors thanks to researchers at Holst Centre in The Netherlands, imec in Belgium, and Philips who have been working on a medical quality detector that uses*a plastic substrate.
The device provides dynamic, high-contrast images at 25 frames per second and a 200 pixels per inch resolution. The plate itself is 160 x 120 pixels in size, but could be made bigger for clinical applications.
Some details on the development of the new detector, according to the an**uncement:
In 2012, the team demonstrated the world’s first complete X-ray detector produced on a thin plastic substrate. An indirect flat panel detector (FPD), it combined a standard scintillator with a **vel organic photodiode layer and organic thin-film transistor (TFT) backplane. By using solution-processed organic semiconductor rather than the usual amorphous silicon, the team reduced process temperatures to be compatible with plastic film substrates. They also eliminated a number of costly lithography steps, opening the door to lower production costs.
**w, the same team has delivered a major breakthrough in device performance. It has reduced the photodiode leakage current (the output from the photodiodes at zero light) by a factor of 10,000, down to 10-7 mA/cm2, bringing it well within the requirements for medical detectors. This improves the signal-to-**ise ratio, and hence image quality at low radiation dose. At the same time, oxide transistors are used instead of organic transistors. The charge carrier mobility in the metal-oxide TFTs is 10-50 times higher than with amorphous silicon and organic transistors, enabling faster image acquisition.
Press release: X-ray detector on plastic delivers medical imaging performance… (http://www.holstcentre.com/en/NewsPress/PressList/PlasticXrayDetector.aspx)
http://feeds.feedburner.com/~ff/Medgadget?d=yIl2AUoC8zA (http://feeds.feedburner.com/~ff/Medgadget?a=t0w6Cb2oO70:-6cDWqibdGE:yIl2AUoC8zA) http://feeds.feedburner.com/~ff/Medgadget?d=qj6IDK7rITs (http://feeds.feedburner.com/~ff/Medgadget?a=t0w6Cb2oO70:-6cDWqibdGE:qj6IDK7rITs) http://feeds.feedburner.com/~ff/Medgadget?i=t0w6Cb2oO70:-6cDWqibdGE:gIN9vFwOqvQ (http://feeds.feedburner.com/~ff/Medgadget?a=t0w6Cb2oO70:-6cDWqibdGE:gIN9vFwOqvQ)
http://feeds.feedburner.com/~r/Medgadget/~4/t0w6Cb2oO70