University of Michigan

H3d, Inc.

Zhong He

Feng Zhang

Christopher Glenn Wahl

Weiyi Wang

William Robert Kaye

Jason Michael Jaworski

An imaging assembly includes a radiation camera configured to obtain position-sensitive radiation data of at least one source of interest. The assembly includes a controller includes a processor and tangible, non-transitory memory on which is recorded instructions for executing a method for reducing background interference in the position-sensitive radiation data in an image domain. The controller is programmed to generate a first set of image data (G) from the position-sensitive radiation data with a first energy window. A second set of image data (G) is generated from the position-sensitive radiation data with a second energy window such that the second energy window does not overlap with the first energy window. A third set of image data (G) is generated having reduced background interference, based at least partially on the first and second sets of image data.

Reduction of background interference in a radiation image

Disclosed herein is a method of determining a characteristic of radiation detected by a radiation detector via a multiple-pixel event having a plurality of radiation interactions. The method includes determining a cathode-to-anode signal ratio for a selected interaction of the plurality of radiation interactions based on electron drift time data for the selected interaction, and determining the radiation characteristic for the multiple-pixel event based on both the cathode-to-anode signal ratio and the electron drift time data. In some embodiments, the method further includes determining a correction factor for the radiation characteristic based on an interaction depth of the plurality of radiation interactions, a lateral distance between the selected interaction and a further interaction of the plurality of radiation interactions, and the lateral positioning of the plurality of radiation interactions.

Three-dimensional, position-sensitive radiation detection

An ionization detector, an electrode configuration and a single polarity charge detection method each utilize a boundary electrode which symmetrically surrounds first and second central interlaced and symmetrical electrodes. All of the electrodes are held at a voltage potential of a first polarity type. The first central electrode is held at a higher potential than the second central or boundary electrodes. By forming the first and second central electrodes in a substantially interlaced and symmetrical pattern and forming the boundary electrode symmetrically about the first and second central electrodes, signals generated by charge carriers are substantially of equal strength with respect to both of the central electrodes. The only significant difference in measured signal strength occurs when the charge carriers move to within close proximity of the first central electrode and are received at the first central electrode. The measured signals are then subtracted and compared to quantitatively measure the magnitude of the charge.

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Ann Arbor, MI, United States of America

Zhong He