John M Patrick

US Patent:

49203185, Apr 24, 1990

Filed:

Oct 3, 1988

Appl. No.:

7/252819

Inventors:

George J. Misic - Hiram OH
Gregory C. Hurst - Shaker Hts. OH
G. Neil Holland - Chagrin Falls OH
John L. Patrick - Solon OH
Paul T. Orlando - Euclid OH

Assignee:

Picker International, Inc. - Highland Hts. OH

International Classification:

G01R 3320

US Classification:

324318

Abstract:

A resonance exciting coil (C) excites magnetic resonance in nuclei disposed in an image region in which a main magnetic field and transverse gradients have been produced. A flexible receiving coil (D) includes a flexible plastic sheet (40) on which one or more loops (20) are adhered to receive signals from the resonating nuclei. Velcro straps (46) strap the flexible sheet and the attached coil into close conformity with the surface of the portion of the patient to be imaged. An impedance matching or coil resonant frequency adjusting network (50) is mounted on the flexible sheet for selectively adjusting at least one of an impedance match and the peak sensitivity resonant frequency of the receiving coil. A preamplifier (52) amplifies the received signals prior to transmission on a cable (24). A selectively variable voltage source (70) applies a selectively adjustable DC bias voltage to the cable for selectively adjusting at least one of the impedance match and the LC resonant frequency of the receiving coil.

US Patent:

46349804, Jan 6, 1987

Filed:

Aug 16, 1984

Appl. No.:

6/641570

Inventors:

George J. Misic - Hiram OH
Aarne Lillo - North Royalton OH
John L. Patrick - Solon OH
G. Neil Holland - Chagrin Falls OH

Assignee:

Picker International, Inc. - Highland Heights OH

International Classification:

G01R 3320

US Classification:

324322

Abstract:

A nuclear magnetic resonance radio frequency coil. The disclosed coil provides high frequency resonance signals for perturbing a magnetic field within the coil. The coil is impedance matched and tuned with adjustable capacitors. A balanced configuration is achieved with a co-axial cable chosen to phase shift an energization signal coupled to the coil. The preferred coil is a thin metallic foil having a shorting conductor, four wing conductors, and uniquely shaped parallel cross conductors connecting the shorting and wing conductors. When mounted to a rf transmissive plastic substrate and energized the coil produces a homogeneous field within a region of interest the size of a patient head. A semicircular balanced feedbar arrangement is used to minimize undesired field contributions.

US Patent:

47933569, Dec 27, 1988

Filed:

Aug 14, 1985

Appl. No.:

6/765708

Inventors:

George J. Misic - Hiram OH
Gregory C. Hurst - Shaker Hts. OH
G. Neil Holland - Chagrin Falls OH
John L. Patrick - Solon OH
Paul T. Orlando - Euclid OH

Assignee:

Picker International, Inc. - Highland Hts. OH

International Classification:

A61B 505

US Classification:

128653

Abstract:

A resonance exciting coil (C) excites magnetic resonance in nuclei disposed in an image region in which a main magnetic field and transverse gradients have been produced. A flexible receiving coil (D) includes a flexible plastic sheet (40) on which one or more loops (20) are adhered to receive signals from the resonating nuclei. Velcro straps (46) strap the flexible sheet and the attached coil into close conformity with the surface of the portion of the patient to be imaged. An impedance matching or coil resonant frequency adjusting network (50) is mounted on the flexible sheet for selectively adjusting at least one of an impedance match and the peak sensitivity resonant frequency of the receiving coil. A preamplifier (52) amplifies the received signals prior to transmission on a cable (24). A selectively variable voltage source (70) applies a selectively adjustable DC bias voltage to the cable for selectively adjusting at least one of the impedance match and the LC resonant frequency of the receiving coil.

US Patent:

47976179, Jan 10, 1989

Filed:

Nov 21, 1986

Appl. No.:

6/933152

Inventors:

George J. Misic - Hiram OH
Aarne Lillo - North Royalton OH
John L. Patrick - Solon OH
G. Neil Holland - Chagrin Falls OH

Assignee:

Picker International, Inc. - Highland Hts. OH

International Classification:

G01R 3320

US Classification:

324322

Abstract:

A nuclear magnetic resonance radio frequency coil. The disclosed coil provides high frequency resonance signals for perturbing a magnetic field within the coil. The coil is impedance matched and tuned with adjustable capacitors. A balanced configuration is achieved with a co-axial cable chosen to phase shift an energization signal coupled to the coil. The preferred coil is a thin metallic foil having a shorting conductor, four wing conductors, and uniquely shaped parallel cross conductors connecting the shorting and wing conductors. When mounted to an rf transmissive plastic substrate and energized the coil produces a homogenous field within a region of interest the size of a patient head. A semicircular balanced feedbar arrangement is used to minimize undesired field contributions.