Patent · US Expired

X-ray image subtracting system

US4355331A · kind A · utility

45Cited by
3References
37Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJan 28, 1981
Grant dateOct 19, 1982
Priority date
Expiry dateJan 28, 2001

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH05G1/60
  • WIPO fieldAudio-visual technology
  • WIPO sectorElectrical engineering

Abstract

An x-ray source projects successive high and low energy x-ray beam pulses through a body and the resultant x-ray images are converted to optical images. Two image pick-up devices such as TV cameras that have synchronously operated shutters receive the alternate images and convert them to corresponding analog video signals. In some embodiments, the analog signals are converted to a matrix of digital pixel signals that are variously processed and subtracted and converted to signals for driving a TV monitor display and analog storage devices. In other embodiments the signals are processed and subtracted in analog form for display. The high and low energy pulses can follow each other immediately so good registration between subtracted images is obtainable even though the anatomy is in motion. The energy levels of the x-ray pulses are chosen to maximize the difference in attenuation between the anatomical structure which is to be subtracted out and that which remains.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.