Varex Imaging Corporation

Other

Gerhard P Roos

Ivan Petrov Mollov

Arundhuti Ganguly

Leonard F Plut

Frank C Valentino

Cesar H Proano

Andrew J Ivan, Jr

Steve Wettstein

Nachiket Jugade

An example imaging system includes a digital conversion circuit and a plurality of pixel circuits each having a photodiode, a biasing circuit, a charge-to-voltage converter, and a switch. The photodiode is configured to generate charges in response to light or radiation. The biasing circuit includes an operational amplifier having an input signal port for receiving a bias reference signal which controls a bias current flowing through an internal circuit of the operational amplifier. The charge-to-voltage converter is configured to accumulate the charges drained by the biasing circuit and convert the accumulated charges into a corresponding output voltage. The switch configured to selectively couple the charge-to-voltage converter to at least one data line. The digital conversion circuit is configured to generate a digital correlated signal sample for each pixel circuit using a difference between a digital signal sample and a digital reset level sample.

Imaging system with a digital conversion circuit for generating a digital correlated signal sample and related imaging method

This invention describes a novel solution to conserve battery and to overcome cold-start artifacts by maintaining the pixel charge traps at a stable value at all times. The design of NIP photodiode and TFT combination requires very low current (in order of hundreds of &#x3bc;A) to stay biased at all times. This allows the pixel charge traps to be easily maintained at a stable value with low power consumption. Power consumption is kept at a minimum by keeping all panel electronics off and only the pixels biased. In addition, keeping the pixels biased helps to overcome the cold-start artifact in the very first image.

Low power standby mode in wireless imagers

A diagnostic imaging system includes a rotating gantry ( ) which defines a subject receiving aperture ( ). A rotatable source of high energy penetrating radiation ( ) and a corresponding two-dimensional flat panel x-ray detector ( ) are disposed across the subject receiving aperture ( ). A plurality of nuclear detector heads ( ) are movably attached to the rotating gantry ( ) in order to detect radiation emitted by a radiopharmaceutical injected into the subject ( ). Each of the nuclear detector heads ( ) within the system includes a variable radiation shield ( ) disposed adjacent a radiation receiving face on the detector head. The diagnostic imaging system may be operated in a fluoroscopic/radiographic mode in which an isocentric x-ray beam strikes the center of the detector surface or in a volume imaging mode.

Volume cone beam acquisition on a nuclear spect system using a digital flat panel

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Sandy, UT, United States of America

Gerhard P Roos