Patents by Inventor Chi-Hua Tung

Chi-Hua Tung has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6429433
    Abstract: A continuous rotation sampling scheme for use with a nuclear medicine gamma camera facilitates collection of transmission and emission data leading to a reduced overall scan time. The gantry (16) contains a plurality of radiation detector heads (20a-20c) with planar faces and at least one adjustably mounted radiation source (30a). During transmission data collection, the gantry (16) continuously rotates about a subject receiving aperture (18) while the radiation source (30a) continuously rasters back and forth across the field of view. The detected transmission radiation (32a) is reconstructed into an attenuation volumetric image representation by a transmission reconstruction processor (64t). The transmission reconstruction processor (64t) performs a fan beam reconstruction algorithm in each of a multiplicity of planes perpendicular to an axis of rotation.
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: August 6, 2002
    Assignee: Koninklijke Philips Electronics, N.V.
    Inventors: Daniel Gagnon, Chi-Hua Tung
  • Patent number: 6388257
    Abstract: An asymmetric sampling scheme for use with a nuclear medicine gamma camera facilitates collection of a full set of higher resolution emission data and lower resolution transmission data with one complete 360° rotation of the gantry. The gantry (16) contains a plurality of radiation detectors (20a-20c) and at least one adjustably mounted radiation source (30a). During a scan, the gantry (16) is incrementally rotated about a subject receiving aperture (18) by a predetermined step size throughout a first 180° of a rotation (P1, . . . , P6). The gantry (16) is then rotated about the subject receiving aperture (18) by one-half the predetermined step size (P7 or P8). The gantry (16) is then incrementally rotated about the subject receiving aperture (18) by the predetermined step size throughout the remaining 180° of the scan (P8, . . . , P2). Emission data collected during the second half of the scan (P8, . . . , P12) is interleaved into the data from the first half of the scan.
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: May 14, 2002
    Assignee: Philips Medical Systems (Cleveland ), Inc.
    Inventors: Daniel Gagnon, Chi-Hua Tung
  • Patent number: 5338936
    Abstract: A SPECT system includes three gamma camera heads (22a), (22b), (22c) which are mounted to a gantry (20) for rotation about a subject (12). The subject is injected with a source of emission radiation, which emission radiation is received by the camera heads. Transmission radiation from a transmission radiation source (30) is truncated to pass through a central portion of the subject but not peripheral portions and is received by one of the camera heads (22a) concurrently with the emission data. As the heads and radiation source rotate, the transmitted radiation passes through different parts or none of the peripheral portions at different angular orientations. An ultrasonic range arranger (152) measures an actual periphery of the subject. Attenuation properties of the subject are determined by reconstructing (90") the transmission data using an iterative approximation technique and the measured actual subject periphery.
    Type: Grant
    Filed: March 8, 1993
    Date of Patent: August 16, 1994
    Assignee: Thomas E. Kocovsky, Jr.
    Inventors: Grant T. Gullberg, Hugh T. Morgan, Chi-Hua Tung, Gengsheng L. Zeng, Paul E. Christian
  • Patent number: 5210421
    Abstract: A SPECT system includes three gamma camera heads (22a), (22b), (22c) which are mounted to a gantry (20) for rotation about a subject (12). The subject is injected with a source of emission radiation, which emission radiation is received by the camera heads. A reconstruction processor (112) reconstructs the emission projection data into a distribution of emission radiation sources in the subject. Transmission radiation from a radiation source (30) passes through the subject and is received by one of the camera heads (22a) concurrently with the emission radiation. The transmission radiation data is reconstructed into a three-dimensional CT type image representation of radiation attenuation characteristics of each pixel of the subject. An attenuation correction processor (118) corrects the emission projection data to compensate for attenuation along the path or ray that it traversed. In this manner, an attenuation corrected distribution of emission sources is generated.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: May 11, 1993
    Assignee: Picker International, Inc.
    Inventors: Grant T. Gullberg, Hugh T. Morgan, Chi-Hua Tung, Gengsheng L. Zeng, Paul E. Christian