Abstract: A multi-mode cone beam computed tomography radiotherapy simulator and treatment machine is disclosed. The radiotherapy simulator and treatment machine both include a rotatable gantry on which is positioned a cone-beam radiation source and a flat panel imager. The flat panel imager captures x-ray image data to generate cone-beam CT volumetric images used to generate a therapy patient position setup and a treatment plan.

Abstract: A method and apparatus for excess signal compensation in an imaging system is described. In one particular embodiment, the invention provides for non-linear background, offset (due to time dependent dark current) and/or lag (including constant, linear and non-linear terms, due to image persistence) corrections of large area, flat panel imaging sensors.

Abstract: A method and apparatus for excess signal compensation in an imaging system is described. In one particular embodiment, the invention provides for non-linear background, offset (due to time dependent dark current) and/or lag (including constant, linear and non-linear terms, due to image persistence) corrections of large area, flat panel imaging sensors.

Abstract: A multi-mode cone beam computed tomography radiotherapy simulator and treatment machine is disclosed. The radiotherapy simulator and treatment machine both include a rotatable gantry on which is positioned a cone-beam radiation source and a flat panel imager. The flat panel imager captures x-ray image data to generate cone-beam CT volumetric images used to generate a therapy patient position setup and a treatment plan.

Abstract: A method and apparatus for excess signal compensation in an imaging system is described. In one particular embodiment, the invention provides for non-linear background, offset (due to time dependent dark current) and/or lag (including constant, linear and non-linear terms, due to image persistence) corrections of large area, flat panel imaging sensors.

Abstract: A method and apparatus for excess signal compensation in an imaging system is described. In one particular embodiment, the invention provides for non-linear background, offset (due to time dependent dark current) and/or lag (including constant, linear and non-linear terms, due to image persistence) corrections of large area, flat panel imaging sensors.

Abstract: An imaging system includes a first image element in a first row, a second image element in the first row, a third image element in a second row, the third image element and the first image element being in a first column, a gate driver, a first electrical line extending from the gate driver, wherein the first and the second image elements are connected to the first electrical line, a second electrical line, wherein the first image element is connected to the second electrical line, and a third electrical line, wherein the third image element is connected to the third electrical line.

Abstract: A method and apparatus for excess signal compensation in an imaging system is described. In one particular embodiment, the invention provides for non-linear background, offset (due to time dependent dark current) and/or lag (including constant, linear and non-linear terms, due to image persistence) corrections of large area, flat panel imaging sensors.

Abstract: A method and apparatus for excess signal compensation in an imaging system is described. In one particular embodiment, the invention provides for non-linear background, offset (due to time dependent dark current) and/or lag (including constant, linear and non-linear terms, due to image persistence) corrections of large area, flat panel imaging sensors.

Abstract: A method and apparatus for excess signal compensation in an imaging system is described. In one particular embodiment, the invention provides for non-linear background, offset (due to time dependent dark current) and/or lag (including constant, linear and non-linear terms, due to image persistence) corrections of large area, flat panel imaging sensors.

Abstract: A method for providing X-ray image data signals corresponding to a selected portion of a two-dimensional image at an enhanced image resolution. During selective exposure of an X-ray receptor to X-ray radiation corresponding to the subject image, image pixel data corresponding to the region of interest (used pixels) are read out with normal pixel data pixel discharge times and at the normal pixel data rate, while image pixel data corresponding to the region not of interest (unused pixels) are read out also with normal pixel data pixel discharge times and at either the normal pixel data rate or an increased pixel data rate. During such pixel data readout intervals, the X-ray radiation exposure can be continuous or selectively pulsed.

Abstract: A method for collecting signals from a detector that has a plurality of lines of image elements includes sending a control signal to a gate driver to select transistor gates for two or more lines of image elements, and simultaneously passing signals from the two or more lines of image elements to charge amplifiers that are coupled to the image elements. A method for collecting signals from a detector that has a plurality of imagers is provided. Each of the imagers has a plurality of lines of image elements. The method includes sending a control signal to a gate driver to select one or more lines of image elements on each of the plurality of the imagers, and simultaneously passing signals from the selected one or more lines of image elements on each of the plurality of the imagers to charge amplifiers that are coupled to the image elements.

Abstract: A method for providing X-ray image data signals corresponding to a selected portion of a two-dimensional image at an enhanced image resolution. During selective exposure of an X-ray receptor to X-ray radiation corresponding to the subject image, image pixel data corresponding to the region of interest (used pixels) are read out with normal pixel data pixel discharge times and at the normal pixel data rate, while image pixel data corresponding to the region not of interest (unused pixels) are read out also with normal pixel data pixel discharge times and at either the normal pixel data rate or an increased pixel data rate. During such pixel data readout intervals, the X-ray radiation exposure can be continuous or selectively pulsed.

Abstract: A method and apparatus for excess signal compensation in an imaging system is described. In one particular embodiment, the invention provides for non-linear background, offset (due to time dependent dark current) and/or lag (including constant, linear and non-linear terms, due to image persistence) corrections of large area, flat panel imaging sensors.

Abstract: A multi-mode cone beam computed tomography radiotherapy simulator and treatment machine is disclosed. The radiotherapy simulator and treatment machine both include a rotatable gantry on which is positioned a cone-beam radiation source and a flat panel imager. The flat panel imager captures x-ray image data to generate cone-beam CT volumetric images used to generate a therapy patient position setup and a treatment plan.

Abstract: A multiple mode digital X-ray imaging system providing for preprocessing “binning” of analog pixel signals from a detector array by selectively summing, within the detector array, adjacent pixel charges on a row-by-row basis and selectively summing, within detector array readout circuits, the previously summed pixel charges (by rows) on a column-by-column basis. An array, or mapping, of “defective pixel” flags is used to identify defective pixels within the detector array, with such flags being added to, or inserted into, the incoming data stream for dynamic processing along with the incoming pixel data. A buffer and filter is used to perform still image capture during the radiographic mode of operation and to recursively filter incoming data frames during the fluoroscopic mode of operation by summing a scaled amount of pixel data from prior data frames with a scaled amount of incoming pixel data from the present data frame.

Abstract: A method and system for reducing correlated noise in imagers is disclosed. Methods are described for determining a pixel correction value. Correlated noise in data generated by imagers can be reduced by applying the pixel correction value to adjust image data before being displayed.

Abstract: A method and circuit for reducing correlated noise in imagers is disclosed. According to an aspect, correlated noise is reduced by coupling the reference inputs of imager amplifiers to common voltage sources. The reference inputs of differential amplifiers on the imager can be coupled to common noise sources such as the imager low gate voltage and array bias voltage through suitably chosen capacitances.

Abstract: A multiple mode digital X-ray imaging system providing for preprocessing “binning” of analog pixel signals from a detector array by selectively summing, within the detector array, adjacent pixel charges on a row-by-row basis and selectively summing, within detector array readout circuits, the previously summed pixel charges (by rows) on a column-by-column basis. An array, or mapping, of “defective pixel” flags is used to identify defective pixels within the detector array, with such flags being added to, or inserted into, the incoming data stream for dynamic processing along with the incoming pixel data. A buffer and filter is used to perform still image capture during the radiographic mode of operation and to recursively filter incoming data frames during the fluoroscopic mode of operation by summing a scaled amount of pixel data from prior data frames with a scaled amount of incoming pixel data from the present data frame.

Abstract: A method and system for reducing correlated noise in imagers is disclosed. Methods are described for determining a pixel correction value. Correlated noise in data generated by imagers can be reduced by applying the pixel correction value to adjust image data before being displayed.