Medical imaging apparatus and method for furnishing difference images
Patent 4430749 Issued on February 7, 1984. Estimated Expiration Date: 
June 30, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 30, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3894181 Radiology Correction for polychromatic X-ray distortion in CT images Apparatus and method for enhancing radiographs Method of selecting a preferred difference image X-ray image subtracting system Patent #: 4355331 InventorAssigneeApplicationNo. 06/280055 filed on 06/30/1981US Classes:382/130, Producing difference image (e.g., angiography)378/98.12, With image subtraction or addition382/254, IMAGE ENHANCEMENT OR RESTORATION382/294Registering or aligning multiple images to one anotherExaminersPrimary: Krass, Errol A.Attorney, Agent or FirmInternational ClassesG06T 5/50 (20060101)H04N 5/32 (20060101) G06T 1/20 (20060101) AbstractThe method and apparatus furnish difference images from a video signal which contains a sequence of images that are obtained from a patient under examination. First a first of the images contained in the video signal is recorded in a first storage device. Thereby a so-called primary mask is formed. Then, a subsequent second of the images contained in the video signal is recorded in a second storage device. Subsequently, a third of these images is recorded in a third storage device. From here on, images contained in the video signal following the third image are recorded alternatingly in the second and the third storage device. At a certain point of time, a signal for starting data acquisition is provided. Simultaneously or thereafter, a so-called secondary mask is selected. The secondary mask is an image completely recorded in the second or third storage device shortly prior to the generation of the data acquisition signal. This secondary mask is subtracted from those images contained in the video signal which appear after the data acquisition signal has been generated. Thereby the afore-mentioned difference images are formed for display. | |
