Patent application number | Description | Published |
20090161819 | SYSTEMS AND METHODS FOR SCANNING AND DATA ACQUISITION IN COMPUTED TOMOGRAPHY (CT) APPLICATIONS - Systems and methods for data acquisition in computed tomography (CT) applications are provided. The systems and methods are particularly adapted for scanning and acquiring/processing data in connection with high-power cone-beam CT applications. The electron beam is moved/scanned along the anode surface to multiple focal positions. Data acquisition for a full projection at one focus position and one view angle is achieved by activating each focus position multiple times during the data acquisition for one angle of the gantry. The detector array and associated data processing system are adapted to rapidly switch between the different focus positions during the acquisitions for one view angle and to collect all data belonging to the same projection into the same data set. Adaptive electron optics are utilized to move/scan the electron beam along the anode surface to the various focus positions. Alternatively, a plurality of cathodes may be provided for respective focus positions and the system may support fast switching therebetween to achieve desirably short spot times. The disclosed CT system permits greater power densities without risk of heat damage to the anode and effectively increases the track velocity of the electron beam on the anode surface. The CT system and associated data acquisition methods have particular utility in CT applications requiring increased time resolution and/or spatial resolution, e.g., cardiac CT applications. | 06-25-2009 |
20090290050 | COMPENSATION OF LEAKAGE CURRENT AND RESIDUAL SIGNALS FOR INTEGRATING DETECTOR BASED ON DIRECT X-RAY CONVERSION - The application describes an X-ray detector, which uses direct X-ray conversion (DiCo) combined with CMOS pixel circuits. DiCo materials have to be used with high voltage to achieve a high field strength. This makes the sensor prone to leakage currents, which falsify the measured charge result. Moreover, most direct conversion materials suffer from large residual signals that lead to temporal artifacts (ghost images) in an X-ray image sequence. A circuit is described, which senses the sensor's dark current including residual signals from previous exposures before the sensor is exposed (again) to X-ray, and freezes relevant circuit parameters at the end of the sensing phase in such way, that the dark current (leakage current and residual signal) can still be drained during exposure. Therefore, the charge pulses generated in the sensor due to X-ray exposure can be integrated without charges carried by the leakage current or residual signal, thus obtaining a more accurate estimate of the deposited X-ray energy. | 11-26-2009 |
20090321643 | DETECTOR FOR AND A METHOD OF DETECTING ELECTROMAGNETIC RADIATION - A detector unit ( | 12-31-2009 |
20100014631 | SCINTILLATOR BASED X-RAY SENSITIVE INTEGRATED CIRCUIT ELEMENT WITH DEPLETED ELECTRON DRIFT REGION - It is described an integrated circuit design and a method to fabricate the same for a high-efficiency, low-noise, position sensitive X-ray detection in particular for medical applications. The device ( | 01-21-2010 |
20100051816 | DETERMINATION OF A SPATIAL GAIN DISTRIBUTION OF A SCINTILLATOR - A method for providing information about a spatial gain distribution of a scintillator for a primary radiation is provided which does not require the irradiation of the scintillator with the primary radiation. The method comprises the step of irradiating the scintillator with a secondary radiation for generating an image of a spatial secondary gain distribution of the scintillator for said second radiation. The spatial secondary gain distribution image corresponds to an image of the spatial primary gain distribution for the primary radiation. In an embodiment of the invention, i.e. in an X-rayimaging device where the primary radiation is X-rayradiation, the invention provides for an accurate calibration of the X-raydetector without irradiating the X-raydetector with X-rayradiation. Rather, irradiation with UV radiation as the secondary radiation provides the desired spatial secondary gain distribution image which can be used for calibration. | 03-04-2010 |
20110211668 | CONVERTER ELEMENT FOR A RADIATION DETECTOR - The invention relates to converter element ( | 09-01-2011 |
20120205549 | DETECTOR UNIT FOR DETECTING ELECTROMAGNETIC RADIATION - According to an exemplary embodiment of the invention a detector unit | 08-16-2012 |
20150137088 | RADIATION DETECTOR WITH AN ORGANIC PHOTODIODE - The present invention relates to a radiation detector with organic photodiodes and to a method of producing such a radiation detector. The TFT backplane ( | 05-21-2015 |