Magnetic resonance scan calibration and reconstruction technique for multi-shot, multi-echo imaging
April 26, 2016. 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 ReferencesCorrection of NMR data acquired by an echo-planar technique Method and apparatus of nuclear magnetic resonance imaging with nonlinearly processed image display Method for the operation of a nuclear magnetic resonance tomograpohy apparatus for the acquisition of at least two differently weighted images Method for phase correction of nuclear magnetic resonance signals Correction for field variation in steady-state MRI by repeated acquisition of zero k-space line Patent #: 5652514 InventorsAssigneeApplicationNo. 638643 filed on 04/26/1996US Classes:324/309, To obtain localized resonance within a sample324/307Using a nuclear resonance spectrometer systemExaminersPrimary: Arana, LouisAttorney, Agent or FirmForeign Patent References
International ClassG01V 003/00AbstractA sequence control (40) causes a transmitter (24) and gradient amplifiers (20) to transmit radio frequency excitation and other pulses to induce magnetic resonance in selected dipoles and cause the magnetic resonance to be focused into a series of echoes in each of a plurality of data collection intervals following each excitation. A receiver (38) converts each echo into a data line. Calibration data lines having a close to zero phase-encoding are collected during each of the data collection intervals. The calibration data lines in each data collection interval are zero-filled (86) to generate a complete data set and Fourier transformed (88) into a series of low resolution complex images (901, 902, . . . 90n), each corresponding to one of the data collection intervals. The low resolution images are normalized (92) and their complex conjugates taken (94). Imaging data lines are sorted by a data collection interval and zero-filled (104) to create full data sets. The full data set corresponding to each data sampling interval is Fourier transformed into partial image representations (1061, 1062, 106n). Each partial image is multiplied (108) by a complex conjugate of the normalized phase correction map (96) to create corrected partial images which are summed (112) to generate a composite image (114). The composite images are density corrected (120).Other References
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