Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1993-09-02
1995-02-07
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, 1286535, G01V 300
Patent
active
053878680
ABSTRACT:
In magnetic resonance apparatus in a magnet system (1) for generating a steady magnetic field, a coil system (3) for generating gradient fields, and at least one RF coil (9) which is tuned to a predetermined frequency and connected to first and second input terminals (53, 55) of an input amplifier circuit (43) of a receiving device (13) for RF order to enable simulation of the loading of the RF coil (9) by a patient during installation and testing of the operation of the apparatus without utilizing a load phantom, the circuit formed by the RF coil (9) and the input amplifier circuit (43) comprises a load network (61 ). In one embodiments first and second input terminals (53, 55) of the input amplifier circuit (43) are interconnected via the load network (61) which comprises a series connection of a switch (63) and a resistor (65). The switch is preferably formed by a diode (63), one electrode of which is connected to one of the input terminals (53) of the input amplifier circuit (43), its other electrode being connected to one end of the resistor (65), the other end of which is connected to the other input terminal (55) via a capacitor (73). The junction point of the resistor (65) and the capacitor (73) is connected to a control terminal (71) whereto a positive or a negative direct voltage, relative to the first input terminal (53), can be applied as desired in order to set the diode (63) to a conductive state or a blocked state.
REFERENCES:
patent: 4717881 (1988-01-01), Flugan
patent: 4731585 (1988-03-01), Fox
patent: 4737718 (1988-04-01), Kemner et al.
patent: 4816765 (1989-03-01), Boskakmp
patent: 5144244 (1992-09-01), Kess
patent: 5166617 (1992-11-01), Ni
"A Signal-To-Noise Calibration Procedure for NMR Imaging Systems" W. A. Edelstein et al, Medical Physics, vol. 11, No. 2, Mar. 1, 1984.
"Simulation of Patient Loading in Nuclear Magnetic Resonance Imaging Through the Use of Inductive Damping Loops" Jennings et al, the British Journal of Radiology 1986, pp. 1031-1034.
Rust Johan W.
Van Heelsbergen Teunis R.
Arana Louis
Slobod Jack D.
U.S. Philips Corporation
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