Gersh Zvi Taicher

6344744, Feb 5, 2002

Feb 28, 2000

09/514724

Gersh Zvi Taicher - Houston TX
Arcady Reiderman - Houston TX

Baker Hughes Incorporated - Houston TX

G01V 300

324303, 324300, 324318

A method for determining nuclear magnetic resonance longitudinal relaxation time of a medium. The method includes magnetically polarizing nuclei in the medium along a static magnetic field, momentarily inverting the magnetic polarization of the nuclei within each one of a plurality of different spatial volumes within the medium, transversely magnetizing the nuclei in each one of the spatial volumes after an individual recovery time corresponding to each one of the spatial volumes, and measuring an amplitude of a magnetic resonance signal from each one of the spatial volumes.

6559640, May 6, 2003

May 22, 2001

09/862821

Gersh Zvi Taicher - Houston TX

Baker Hughes Incorporated - Houston TX

G01V 300

324303, 324306

An apparatus and method for making NMR measurements uses an electromagnet for producing the static magnetic field. When used in well logging applications, the absence of a strong permanent magnet eliminates almost completely the amount of ferromagnetic debris picked up on the logging tool when passed through casing. The absence of debris results in the static magnetic field being substantially in conformance with design. The electromagnet is designed to give a static field of 0. 6-6 mT (10-100 times the earths magnetic field). Free induction decay or spin echo measurements may be made to give low resolution measurements of bulk properties of earth formations. The same coil configuration may be used to estimate body fat measurements of a human body. An alternate embodiment of the invention uses a capacitive discharge through an electromagnet with a time varying magnetic field with the receiver operating at a different frequency from the transmitter.

6586931, Jul 1, 2003

Apr 20, 2001

09/839271

Gersh Zvi Taicher - Houston TX

Baker Hughes Incorporated - Houston TX

G01V 300

324303

An apparatus and a method for measurement of NMR relaxation parameters of earth formations uses a coil on a logging tool to substantially polarize nuclear spins within a volume of earth. The polarizing pulse then switched off adiabatically. The magnetization of the spins then precesses around earths magnetic field at a Larmor frequency corresponding to the earths field. A second coil on the logging tool is pulsed with a carrier signal having this frequency and modulated by a CPMG sequence to obtain spin echo signals. The spin echo signals may be received by the same coil or by a second coil. Alternatively, beam steering of two coils on the tool may be carried out to ensure a resultant field that has a significant component transverse to the earths field for carrying out the spin echo measurements.

6882147, Apr 19, 2005

Aug 27, 2003

10/649423

Gersh Zvi Taicher - Houston TX, US
Arcady Reiderman - Houston TX, US

Baker Hughes Incorporated - Houston TX

G01V003/00

324303, 324300

The present invention provides an improved NMR sequence for detecting small amount of a substance having short NMR transversal relaxation in the presence of a large amount of a substance having long NMR relaxation. A sequence of pulses enables the original z-oriented magnetization vector of a substance to experience differing reorientation effects based on the relative transverse relaxation rate of the substance. After said pulse sequence, a substance with long transverse relaxation experiences a substantial inversion of its nuclear magnetization vector, while a substance with short transverse relaxation experiences a nearly zero value of its vector. After a determinable wait time, said vectors can be shown to experience recognizably different behavior under the application of a CPMG sequence of pulses. Appropriate wait time can be determined by zeroing out spin echoes during the CPMG pulse sequence.

7343192, Mar 11, 2008

Sep 23, 2003

10/669043

Arcady Reiderman - Houston TX, US
Gersh Z. Taicher - Houston TX, US
Zinovy Krugliak - Houston TX, US

Echo Medical Systems, LLC - Houston TX

A61B 5/05

600410, 324309

A method is disclosed for analyzing body composition. The method includes inducing a static magnetic field in the body. The static magnetic field has a known distribution along a longitudinal axis of the body. A radio frequency magnetic field is induced in the body. The radio frequency and a bandwidth thereof are selected to induce nuclear magnetic resonance phenomena in a selected axial segment along the body. Nuclear magnetic resonance phenomena are from the selected axial segment. Composition is determined from the magnetic resonance signals. The measurement may be repeated in different axial segments by changing the static field amplitude or a frequency of the RF magnetic field. In some embodiments, a gradient field is superimposed over the static field.

7355402, Apr 8, 2008

Nov 20, 2006

11/602895

Gersh Z. Taicher - Houston TX, US
Zinovy Krugliak - Houston TX, US
Israel Kovner - Houston TX, US
Andrei Baikalov - Houston TX, US

Echo Medical Systems, LLC - Houston TX

G01V 3/00

324300, 324307

A method for hazardous liquid detection within a container includes inducing a static magnetic field in the container, inducing a radio frequency magnetic field in the container at a frequency selected to excite nuclear magnetic resonance phenomena in liquids; detecting nuclear magnetic resonance signals from the container and analyzing the signals for presence of liquids above a threshold mass.

7366559, Apr 29, 2008

Jun 26, 2003

10/606943

Gersh Z. Taicher - Houston TX, US
Arcady Reiderman - Houston TX, US

Echo Medical Systems, LLC - Houston TX

A61B 5/05
G01V 3/00

600410, 600407, 324307, 324316, 324317, 324318, 324319, 324320

A method is disclosed for measuring whole body composition. The method includes confining movement of the body to a selected volume, inducing a static magnetic field in the volume, inducing a pulsed radio frequency magnetic field in the volume, and receiving nuclear magnetic resonance signals from the body. The resonance signals from any part of the body are substantially independent of a position of the body part within the volume. Whole body composition is assessed from the resonance signals.

7366560, Apr 29, 2008

May 19, 2005

11/133104

Gersh Z. Taicher - Houston TX, US
Arcady Reiderman - Houston TX, US
Israel Kovner - Houston TX, US

Echo Medical Systems, LLC - Houston TX

A61B 5/05

600410, 324307

A method is disclosed for analyzing composition of a body part from nuclear magnetic resonance measurements made on the body part. The method includes exciting a predetermined sequence of nuclear magnetic resonance phenomena in the body part and measuring nuclear magnetic resonance signals from the body part. At least a part of the measured signals are composed into a measurement vector. The mass of the at least one constituent is determined as a predetermined function of the measurement vector. The predetermined function represents the at least one constituent and defines a standard for a range of at least one of compositional variations and temperature variations of the at least one constituent.