G - Physics – 01 – N
Patent
G - Physics
01
N
324/1
G01N 24/08 (2006.01) A61B 5/05 (2006.01) G01R 33/465 (2006.01)
Patent
CA 1187936
ABSTRACT OF THE DISCLOSURE A nuclear magnetic resonance analytic apparatus for obtain- ing tissue metabolism information from a living body member. The apparatus consists of a large high-intensity electromagnet with an inner space having a uniform magnetic field, for receiving the body member. The space has a probe coil mounted therein with which the body member is engageable. For phosphorus-31 metabolite, there is provided a 24.33 MHz generator connected through a control logic section and a driver unit to probe coil via a transmitter/ receiver switching unit arranged to in effect switch the probe coil from a normal connection with a demodulation circuit to the driver unit responsive to a burst of RF pulse energy applied to the switch- ing unit by the driver unit via the control logic section by com- mand of a computer. The control logic section controls the system so as to first apply short pulses of the RF signal to the probe coil for a predetermined excitation time period, gating-off the demodu- lation unit. After this excitation period, the transmitter circuit is disabled, the demodulation circuit is gated-on, and the switch- ing units restores the normal connection of the prove coil to the demodulation unit, allowing the free induction decay signals sensed by the probe coil to be demodulated and furnished in analog form to the computer, which converts these analog signals into represent- ations of the intensities versus frequency shift of the respective metabolite components of the tissue. Circuitry is provided for applying a predetermined simulated free induction decay signal to the demod- ulation circuit for testing the apparatus.
426957
Chance Britton
Eleff Scott M.
Leigh John S.
Chance Britton
Eleff Scott M.
Leigh John S.
Mcfadden Fincham
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