US3795855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic resonance probe system
Assignee: Cyclotron Corp
•
Filing: 1971-12-08
•
Granted: 1974-03-05
•
Expires: 1991-12-08
Abstract
Abstract A magnetic resonance probe system having an impedance bridge wherein a sample containing coil forms one leg of the bridge and is positioned in a magnetic field for producing resonance in the sample; an RF generator connected to bridge input terminals for exciting the sample; and means differentially comparing the potentials at the midpoint or null terminals.
Inventors
- 👤 G Browning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:37
CPC Classifications
G; G01; G01N; G01N24/00; G01N24/08; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/36; G01R33/34; G01R33/34046; G01R33/34053
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
190 words
A magnetic resonance probe system comprising: a bridge having a sample containing first coil adapted for positioning in a magnetic field producing resonance in the sample and a second coil having one end connected to one end of said first coil to provide a mid-point terminal of a first voltage divider, the opposite ends of said coils providing input RF excitation terminals for said divider, and a second voltage divider having third and fourth impedance legs connected to provide a midpoint terminal for said second voltage divider and opposite input RF excitation terminals, said first and second coils having substantially identical electrical characteristics and said impedance legs comprising third and fourth coils of substantially identical electrical characteristics to said first and second coils and being connected thereto in a four coil balanced bridge configuration; a probe body supporting said first and seconD coils and being adapted for positioning in said magnetic field; RF excitation means including a remote RF generator; flexible coaxial transmission lines of substantially equal length and electrical characteristics connecting said generator to the input RF excitation terminals; and means differentially comparing the potentials at said mid-point terminals.
Claim 2
Dependent Claim
190 words
A magnetic resonance probe system comprising: a bridge having a sample containing first coil adapted for positioning in a magnetic field producing resonance in the sample and a second coil having one end connected to one end of said first coil to provide a mid-point terminal of a first voltage divider, the opposite ends of said coils providing input RF excitation terminals for said divider, and a second voltage divider having third and fourth impedance legs connected to provide a midpoint terminal for said second voltage divider and opposite input RF excitation terminals, said first and second coils having substantially identical electrical characteristics and said impedance legs comprising third and fourth coils of substantially identical electrical characteristics to said first and second coils and being connected thereto in a four coil balanced bridge configuration; a probe body supporting said first and seconD coils and being adapted for positioning in said magnetic field; RF excitation means including a remote RF generator; flexible coaxial transmission lines of substantially equal length and electrical characteristics connecting said generator to the input RF excitation terminals; and means differentially comparing the potentials at said mid-point terminals.
Claim 3
Dependent Claim
41 words
A probe system as defined in claim 1, said body being formed of non-magnetic electric conducting material and providing a reference ground; and a resistive load connected to the probe terminal end of each of said transmission lines and said body.
Claim 4
Dependent Claim
25 words
A probe system as defined in claim 2, said resistive loads having a value less than one-tenth of the inductive reactance at said input terminals.
Claim 5
Dependent Claim
44 words
A probe system as defined in claim 2, said generator providing a reference ground; a resistive load connected to the generator end of each of said transmission lines and said last named reference ground; and said coaxial lines having shields connecting said reference grounds.
Claim 6
Dependent Claim
43 words
A probe system as defined in claim 1, said body being formed of non-magnetic electric conducting material to provide substantially identical electrostatic shielding for said first and second coils; and a similar body providing substantially identical shielding of said third and fourth coils.
Claim 7
Dependent Claim
73 words
A probe system as defined in claim 1, said body supporting said first and second coils in spaced substantially parallel position with their axes normal to said field; field modulation coils carried by said body on opposite sides of said first coil with coincident field producing axes normal to and substantially intersecting the axis of said first coil; and an alternating current source connected to said field modulation coils for modulating said field.
Claim 8
Dependent Claim
57 words
A probe system as defined in claim 6, said means comprising: an RF differential amplifier; a detector connected to said amplifier; a detected signal amplifier connected to said detector; and an oscilloscope connected to said last named amplifier for displaying said detected signal, the horizontal sweep circuit of said oscilloscope being connected to said alternating current source.
Claim 9
Dependent Claim
54 words
A probe system as defined in claim 6, said body being formed of a non-magnetic electric conducting material providing electrostatic shielding for said first and second coils and being formed with a slot traversing the interior of said field modulation coils for minimizing eddy currents in said body induced by said field modulation coils.
Claim 10
Dependent Claim
35 words
A probe system as defined in claim 5, and means carried by said last named body and adjustably positionable relative to at least one of said third and fourth coils to adjust the permeability thereof.
Claim 11
Dependent Claim
40 words
A probe system as defined in claim 8, said similar body being mounted adjacent said generator; and said transmission lines connecting the input terminals of said first and second coils to the input terminals of said third and fourth coils.
Claim 12
Dependent Claim
70 words
A probe system as defined in claim 8, said body supporting said third and fourth coils adjacent to and substantially parallel with said first and second coils with the axes of said third and fourth coils located within and normal to said field; said coils being connected to position said input terminals at said body; and said transmission lines extending from said input terminals to said remote located RF generator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |