公开(公告)号：MX9708221A

公开(公告)日：1998-06-30

申请号：MX9708221

申请日：1997-10-24

Applicant: BIOFIELD CORP

Inventor： FAUPEL MARK L ,  GORDON CHARLES LEONARD ,  STEPHENS JOHN D ,  NATHANSON SETH D

IPC: A61B5/04 ,  A61B5/0408 ,  A61B5/05 ,  A61B5/053 ,  G06N3/04 ,  A61B05/05

Abstract: Se presenta un método y un aparato para explorar o sensar estados de enfermedad, lugares de daño o condiciones corporales en un sujeto humano o animal al detectar separadamente el biopotencial CD del campo electromagnético en una pluralidad de puntos de prueba en un área de ensayo. Los biopotenciales CD son convertidos análogo a digital (36, 38) conectados a sensores de prueba biopotenciales Cd (12) en los puntos de prueba a señales de prueba digitales, y los sensores de prueba biopotencial CD (12) y los convertidos de análogo a digital (36, 38) forman una seccion sensora biopotencial (48) que está separada de una seccion procesadora (46) que recibe y procesa las señales de prueba. Las señales entre la seccion procesadora (46) y la seccion sensora biopotencial (48) se transmiten por una red de transmision que aísla electricamente las dos secciones. La conversion realizada por los convertidores (36, 38) están sincronizadas con la frecuencia de línea CA del suministro de energía o electricidad del aparato (42) y las señales de prueba digitales son filtradas en la seccion procesadora (46) por filtros digitales (68), cada uno de los cuales está dedicado a un sensor de prueba biopotencial (12) CD individual.

公开(公告)号：EP0176352A3

公开(公告)日：1988-09-21

申请号：EP85306794

申请日：1985-09-24

Applicant: SOUTHWEST RESEARCH INSTITUTE

Inventor： Rollwitz, William J.

IPC: G01N24/08 ,  A61B05/05

CPC classification number: G01R33/34053 ,  A61B8/0825 ,  A61B8/406 ,  G01R33/383 ,  G01R33/4835 ,  G01R33/50

Abstract: For use in testing for cancer in human tissue, an improved method adapted to segmental progressive NMR interrogation of human tissue is disclosed. The NMR test determines the response of water in body tissue, the body tissue being examined in sized slices one after the other wherein a comparison between slice to slice is made. Progressive subtractive data enhances data output, thereby enlarging the signal obtained from a small tumor.

公开(公告)号：EP0165742A3

公开(公告)日：1987-05-27

申请号：EP85304000

申请日：1985-06-05

Applicant: VARIAN ASSOCIATES, INC.

Inventor： Codrington, Robert Smith

IPC: A61M25/00 ,  A61B05/05

CPC classification number: A61M25/0127 ,  A61B5/055 ,  A61B2090/3958 ,  G01R33/285

Abstract: A magnetic resonance catheter system combines. with a magnetic resonance imaging device (10). A catheter (26) comprises means (28, 32, 32', 36) for exciting a weak magnetic field at the tip of the catheter. The location of the catheter tip is, thereby obtained in cooperation with the magnetic resonance imager (10).

公开(公告)号：EP0117134A3

公开(公告)日：1986-03-26

申请号：EP84301020

申请日：1984-02-16

Applicant: Macovski, Albert

Inventor： Macovski, Albert

IPC: G01N24/08 ,  A61B05/05

CPC classification number: G01R33/5635 ,  A61B5/0263 ,  A61B5/055 ,  G01R33/56308

Abstract: A two-dimensional projection image of the NMR activity within a volume is obtained. The signals due to static material are cancelled and do not appear in the projection image. The signals due to moving blood in vessels produce an isolated image of the vessels with the superimposed structure removed. The excitation of a plane is accomplished using a single excitation pulse without requiring an a.c. gradient. The uniformity requirement of the inversion excitation is minimized. Images are generated which distinguish the direction of flow.

公开(公告)号：EP0118281A3

公开(公告)日：1985-11-27

申请号：EP84301299

申请日：1984-02-28

Applicant: CHILDREN'S HOSPITAL MEDICAL CENTER

Inventor： Clark, Leland C., Jr.

IPC: G01N24/08 ,  A61B05/05

CPC classification number: A61B5/145 ,  A61K49/06 ,  A61K49/1806 ,  G01R33/465 ,  G01R33/485 ,  G01R33/5601 ,  Y10T436/24

Abstract: A method to detect indirectly at least one gas, particularly dissolved gases, of an animal employing nuclear magnetic resonance techniques (NMR). The method examines an NMR spectrum to determine chemical shift relaxation times or spin-spin couplings for an element of an animal influenced by at least one gas of the animal, the chemical shift corresponding to the amount or identify of the gas.

公开(公告)号：EP0132785A3

公开(公告)日：1985-03-13

申请号：EP84108497

申请日：1984-07-18

Applicant: Siemens Aktiengesellschaft

Inventor： Wirth, Axel

IPC: A61B05/05 ,  G01N24/04 ,  A61B05/04 ,  H03H07/01

CPC classification number: A61B5/0555 ,  A61B5/0424 ,  G01R33/5673 ,  H03H7/0115

公开(公告)号：EP0255220A3

公开(公告)日：1988-11-30

申请号：EP87305114

申请日：1987-06-10

Applicant: PICKER INTERNATIONAL, INC.

Inventor： Pattany, Prandip M. ,  McNally, James M.

IPC: A61B05/05 ,  G01N24/08

CPC classification number: G01R33/56509 ,  G01F1/716 ,  G01R33/482 ,  G01R33/56308 ,  G01R33/56316

Abstract: A pulse sequencer (40) controls a resonance excitation controls circuit (22), an inversion pulse controls circuit (24), a slice select gradient controls circuit (32), a read gradient controls circuit (34), and a phase encode gradient controls circuit (36) to cause an appropriate gradient pulse imaging sequence to be generated to the image region. The operator selects an appropriate imaging sequence such as a spin echo, inversion recovery, multi-echo, gradient echo, or other conventional imaging sequence and the parameters, such as the number of repetitions, from an image pulse sequence and motion desensitization memory (44, 46). In the exemplary pulse sequences of FIGURES 2-4, this memory directs the formation of RF pulses (62, 66), slice selection pulses (60, 64) and read gradient pulse (70), phase encode gradient pulse (72), and the appropriate additional gradient pulses for rephasing signals from one or more of static, constant velocity, accelerating, and pulsatilitory tissue in the image region. By rephasing the magnetic resonance signal components from tissue moving with the selected motion characteristics such that the corresponding moments in time are set equal to zero, motion artifacts from moving tissue are suppressed.

公开(公告)号：EP0135326A3

公开(公告)日：1987-05-20

申请号：EP84305232

申请日：1984-08-01

Applicant: PICKER INTERNATIONAL LIMITED

Inventor： Gilderdale, David John

IPC: G01N24/04 ,  G01N24/08 ,  A61B05/05

CPC classification number: G01R33/34007 ,  G01R33/34069 ,  G01R33/34084 ,  G01R33/343

Abstract: In a nuclear magnetic resonance apparatus an RF coil arrangement comprises two or more separable parts (51 and 53) adapted to be assembled around the body to be examined to form the coil arrangement. The parts are suitably arranged to be connected, when assembled, by adjustable coupling means (55, 57, 59 and 61) so that the volume embraced by the coil arrangement may be adjusted. The invention enables the coil arrangement to be positioned more closely around a body being examined than is possible with conventional, unitary, tubular coil arrangements.

公开(公告)号：EP0135847A3

公开(公告)日：1986-10-08

申请号：EP84110427

申请日：1984-09-01

Applicant: GENERAL ELECTRIC COMPANY

Inventor： Edelstein, William Alan

IPC: G01N24/08 ,  A61B05/05

CPC classification number: G01R33/561 ,  G01R33/54

Abstract: An improved nuclear magnetic resonance (NMR) imaging method using selective excitation in conjunction with driven free precession (DFP) to form two or three-dimensional images is disclosed. The combination of these techniques enables a plane section to be selected and subsequently reconstructed from multiple angle projections by known multiple angle reconstruction techniques such as are used in X-ray computed tomography. Alternatively the plane sections can be reconstructed using known Spin Warp or Fourier Transform Zeugmatography methods to produce a map of the spin density of the material, or a combination of spin density of the material, or a combination of spin density and relaxation times of the material in the selected plane. The improved imaging technique is particularly applicable to the detection and localization of various disease states of biological tissue which exhibit altered relaxation times.

公开(公告)号：EP0117725A3

公开(公告)日：1985-11-27

申请号：EP84301174

申请日：1984-02-23

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Kawachi, Tatsuhiko Tokyo Shibaura Denki K.K.

IPC: G01N24/08 ,  A61B05/05

CPC classification number: G01R33/5673

Abstract: @ Nuclear magnetic resonance diagnostic apparatus which forms an image of a slice of an object is described. The apparatus includes a circuit for detecting NMR signals induced from an object, having a resonance circuit formed by a receiving coil (31) which surrounds the object and a capacitor (32), peak-hold means (39) for receiving the NMR signals generated from the resonance circuit (31, 32) to retain the maximum value of the NMR signals in an excitation cycle of the sprins of the excited nuclei, and a synchronism device (42) for controlling the selection of the NMR signals in response to the value held by the peak-hold means being with a predetermined range of levels. The variation of the NMR signal level in accordance with the variation of floating capacitance of the resonance circuit, which alters according to the motion of the object, is thus used to detect the state of the objects movement and the NMR signals selected in a predetermined state of motion.