Digital subtraction-imaging apparatus utilizing cardiac-synchronized subtraction method
Patent 4729379 Issued on March 8, 1988. Estimated Expiration Date: 
December 23, 2006. 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.
December 23, 2006. 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 ReferencesReal-time digital X-ray subtraction imaging Diagnostic x-ray installation for the representation of organs Apparatus for examining a biological object by using radiation Patent #: 4611340 InventorApplicationNo. 06/945542 filed on 12/23/1986US Classes:600/431, Detectable material placed in body378/95, Object responsive control378/98.12, With image subtraction or addition600/436, Nuclear radiation (e.g., radioactive emission, etc.)600/521Detecting R portion of signal waveformExaminersPrimary: Kamm, William E.Assistant: Smith, Ruth S. Attorney, Agent or FirmInternational ClassesG06T 5/50 (20060101)H04N 5/32 (20060101) A61B 6/00 (20060101) Foreign Application Priority Data1985-12-27 JPAbstractIn a digital subtraction imaging apparatus, the digital subtraction between mask images and contrast images is carried out in synchronism with cardiac beats of an object under medical examination such as a patient. The subtraction-imaging apparatus includes a first memory, a second memory, a cardiac-synchronized subtraction unit, and a central processing unit. When the number of the contrast images acquired within one cardiac cycle is smaller than that of the mask images, for example, when four contrast images and five mask images are obtained, the digital subtraction by the subtraction unit, under the control of the central processing unit, is performed between four contrast images and only four mask images, without using the fifth mask image. Conversely, when the number of the contrast images is greater than that of the mask images, for example, when five contrast images and four mask images are obtained, the digital subtraction is effected between four mask images and four contrast images, and furthermore, is performed between the fourth mask image and the fifth contrast image, under the control of the central processing unit.Other References
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