Method for computed tomography
Method and apparatus for monitoring of positions of patients and/or radiation units
Video picture processing including movement detection
Noise reducing system
Apparatus and method for enhancing radiographs
Method of selecting a preferred difference image
Movement detector for television signals Patent #: 4364087
ApplicationNo. 06/278481 filed on 06/29/1981
US Classes:600/425, With tomographic imaging obtained from electromagnetic wave128/922, Including image analysis250/363.02, Body scanner or camera250/369, With output system378/901, COMPUTER TOMOGRAPHY PROGRAM OR PROCESSOR378/98.12, With image subtraction or addition378/98.2, Televison382/130Producing difference image (e.g., angiography)
ExaminersPrimary: Krass, Errol A.
Attorney, Agent or Firm
International ClassH04N 5/32 (20060101)
AbstractThe apparatus contains a detector for detecting radiation emitted from an object under examination, and a device associated therewith for forming an imaging signal. The imaging signal is composed of a sequence of individual image signals each of which represents an individual radiation image of the object under examination. The imaging signal comprises a first individual image signal and second individual image signals following the first individual image signal. The apparatus also contains a signal processing circuit for processing the imaging signal and for forming a display signal thereof, and a display device for receiving the display signal and for displaying a sequence of images of the object under examination. In particular, the signal processing device basically contains three functional elements, that is a storage device, a subtractor, and an evaluation circuit. The storage device is provided for storing the first individual image signal, thereby forming a reference image signal. The subtractor subtracts the reference image signal from each of the second individual image signals. Thereby it forms a difference imaging signal composed of a sequence of individual difference image signals. The monitoring device receives the difference imaging signal. It determines whether a portion of each of the second individual image signals is different from the reference image signal. If so, it issues a change-of-image signal which is indicative of a change of image intensity distribution. In X-ray examinations of a patient, for instance, where a contrast medium is applied to the patient, such change may be caused by the appearance of the contrast medium in the radiation image.