公开(公告)号：US11047997B2

公开(公告)日：2021-06-29

申请号：US17007063

申请日：2020-08-31

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Darren Holland ,  Robert Olesen ,  Larry Burggraf ,  Buckley O'Day ,  James Bevins

IPC: G01T7/00 ,  G06N3/04 ,  G01T1/20 ,  G01T3/06 ,  G06N3/08 ,  A61B6/00

Abstract: A radiation imaging system images a distributed source of radiation from an unknown direction by rotating a scatter mask around a central axis. The scatter mask has a pixelated outer surface of tangentially oriented, flat geometric surfaces that are spherically varying in radial dimension that corresponds to a discrete amount of attenuation. Rotation position of the scatter mask is tracked as a function of time. Radiation counts from gamma and/or neutron radiation are received from at least one radiation detector that is positioned at or near the central axis. A rotation-angle dependent detector response curve (DRC) is generated based on the received radiation counts. A reconstruction algorithm for distributed radiation source(s) and/or localized source(s) are applied based on the tracked rotation position and prior characterization of the detector response for a given scatter mask. A two-dimensional image with relative orientation and source distribution is generated from the measured DRC.

公开(公告)号：US11054535B2

公开(公告)日：2021-07-06

申请号：US16812844

申请日：2020-03-09

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Robert Olesen ,  Bryan Egner ,  Darren Holland ,  Valerie Martin ,  James Bevins ,  Larry Burggraf ,  Buckley O'Day

IPC: G01T3/06 ,  G01T1/10 ,  G01T1/20 ,  G01T1/15

Abstract: A directional radiation detection system and an omnidirectional radiation detector. The omnidirectional radiation detector detects radiation comprising at least one of: (i) gamma rays; and (ii) neutron particles. A radiation scatter mask (RSM) of the radiation detection system includes a rotating sleeve received over the omnidirectional radiation detector and rotating about a longitudinal axis. The RSM further includes: (i) a fin extending longitudinally from one side of the rotating sleeve; and (ii) a wall extending from the rotating sleeve and spaced apart from the fin having an upper end distally positioned on the rotating sleeve spaced apart or next to from a first lateral side of the fin and a lower end proximally positioned on the rotating sleeve and spaced apart from or next to a second lateral side of the fin.

公开(公告)号：US20200292720A1

公开(公告)日：2020-09-17

申请号：US16812844

申请日：2020-03-09

Applicant: US Gov't as represented by Secretary of Air Force

Inventor： Robert Olesen ,  Bryan Egner ,  Darren Holland ,  Valerie Martin ,  James Bevins ,  Larry Burggraf ,  Buckley O'Day

IPC: G01T3/06 ,  G01T1/15 ,  G01T1/20

Abstract: A directional radiation detection system and an omnidirectional radiation detector. The omnidirectional radiation detector detects radiation comprising at least one of: (i) gamma rays; and (ii) neutron particles. A radiation scatter mask (RSM) of the radiation detection system includes a rotating sleeve received over the omnidirectional radiation detector and rotating about a longitudinal axis. The RSM further includes: (i) a fin extending longitudinally from one side of the rotating sleeve; and (ii) a wall extending from the rotating sleeve and spaced apart from the fin having an upper end distally positioned on the rotating sleeve spaced apart or next to from a first lateral side of the fin and a lower end proximally positioned on the rotating sleeve and spaced apart from or next to a second lateral side of the fin.