Automatic gain control apparatus for NMR imaging system
Patent 4700138 Issued on October 13, 1987. Estimated Expiration Date: 
June 12, 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.
June 12, 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 ReferencesAnalytical instrument optimum data acquisition method and apparatus Patent #: 4070708 InventorsAssigneeApplicationNo. 06/873390 filed on 06/12/1986US Classes:324/322, Electronic circuit elements324/313Including polarizing magnetic field/radio frequency tuningExaminersPrimary: Levy, Stuart S.Assistant: Arana, Louis Attorney, Agent or FirmInternational ClassesG01R 33/32 (20060101)G01R 33/36 (20060101) Foreign Application Priority Data1985-06-28 JPAbstractIn measuring a number of echo signal, which normally attenuate chronologically, in a single pulse sequence, such as in multi-echo method or a multi-slice method, each echo signal is received and suitably amplified by a reception amplifier having predetermined levels of gain for different time periods during which the successive echo signals are processed such that the echo signals received at a data collection unit are all of substantially the same amplitude regardless of where they appear in the time sequence. The predetermined levels of gains are obtained by false scanning prior to actual image scanning and calculation and storing in a memory. As a result, the echo signals can be received within a dynamic range which is smaller than using the conventional system. | |
