Patents by Inventor Joel E. Gray

Joel E. Gray 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: 7503694
    Abstract: A device and method for evaluating the performance of X-ray machines used to produce radiographic images is described. An analyzer including an X-ray dosimeter and an imaging device is sent to the facility having the X-ray machine to be evaluated. The analyzer may be used with a film pack or a digital image detector. The analyzer is exposed in accordance with testing instructions and returned to an evaluation agency. The radiation dose and HVL is determined from the dosimeter, and the image quality is determined from analysis of a radiograph of a target having differing X-ray absorption portions. A data base of results may be used to provide comparative analysis.
    Type: Grant
    Filed: January 30, 2007
    Date of Patent: March 17, 2009
    Inventor: Joel E. Gray
  • Publication number: 20070183590
    Abstract: A device and method for evaluating the performance of X-ray machines used to produce radiographic images is described. An analyzer including an X-ray dosimeter and an imaging device is sent to the facility having the X-ray machine to be evaluated. The analyzer may be used with a film pack or a digital image detector. The analyzer is exposed in accordance with testing instructions and returned to an evaluation agency. The radiation dose and HVL is determined from the dosimeter, and the image quality is determined from analysis of a radiograph of a target having differing X-ray absorption portions. A data base of results may be used to provide comparative analysis.
    Type: Application
    Filed: January 30, 2007
    Publication date: August 9, 2007
    Inventor: Joel E. Gray
  • Patent number: 4692704
    Abstract: A phantom for evaluating the operating performance of a magnetic resonance imaging scanner system includes a generally tubular body enclosed at its ends and containing a cylindrical stack of a plurality of leaves. Each leaf has one or more wedge-shaped slices or sectors cut out for identification and reference purposes. Leaves having one, two and four slices formed therein are arranged in a predetermined order in the stack with the slices in a predetermined helical pattern approximately eighteen degrees apart. The container is filled with a liquid and is inserted in the magnetic resonance imaging system to obtain images which can be evaluated to determine if the system is in calibration. A typical evaluation determines MRI slice thickness, slice location, and contiguity of the slices.
    Type: Grant
    Filed: February 6, 1986
    Date of Patent: September 8, 1987
    Assignee: Mayo Medical Resources
    Inventor: Joel E. Gray