Surgery – Truss – Pad
Patent
1989-07-13
1990-12-25
Smith, Ruth S.
Surgery
Truss
Pad
324309, A61B 5055
Patent
active
049795120
ABSTRACT:
A pulse sequence is disclosed for a nuclear magnetic resonance tomography apparatus wherein the scans are executed with a non-constant repetition time, such as due to ECG triggering. Normally, the non-constancy of the repetition time in a nuclear magnetic resonance tomography apparatus results in a deterioration of the quality of the images, due to eddy currents. In the pulse sequence disclosed herein, gradient pulses having a chronological mean value are inserted in the pause between two successive scans, this chronological mean value being equal to the chronological mean value of the corresponding gradients during the scans. The disturbing influence of variable repetition times on the image quality is thus eliminated.
REFERENCES:
patent: 4647858 (1987-03-01), Bottomley
"Pulsed Magnetic-Field Gradient Program for Studying Diffusion of Absorbed Molecules by the Spin-Echo Method", Anisimov et al., Instrumentation and Experimental Techniques, vol. 21, No. 1/2, 1978, pp. 134-136.
"Magnetic Resonance Imaging with Respiratory Gating: Techniques and Advantages", Ehman et al., American Roentgen Ray Society AJR 143, Dec. 1984, pp. 1175-1182.
Siemens Aktiengesellschaft
Smith Ruth S.
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