Apparatus and method of acquiring physiological gating signals f

Details Apparatus and method of acquiring physiological gating signals f Apparatus and method of acquiring physiological gating signals f

1985-08-09

1987-12-15

Kamm, William E.

Surgery

Truss

Pad

128696, 128721, 324309, A61B 505

Patent

active

047125608

ABSTRACT:
An apparatus and method are disclosed which provide signals corresponding to physiological motion of an imaging slice in an MR system for use in synchronizing acquisition of MR data with movement of the slice. The signals are generated by initiating an incident signal of a frequency .omega. which interacts with the imaging slice and returns a reflected signal of a frequency .omega.. By mixing the incident and reflected signal, a baseband signal is generated which is indicative of changes in the phase and magnitude relationships between the signals. Because changes in the phase and magnitude relationships between the signals are related in an approximately linear manner to movement of the imaging slice, the baseband signal provides an indication of movement of the imaging slice of sufficient quality to serve as an accurate triggering signal to synchronize acquistion of MR data with movement of the imaging slice.

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