Method and apparatus for simultaneous acquisition of high resolution NMR spectra from multiple samples

• US 6,456,072 B1
• Filed: 05/26/2000
• Issued: 09/24/2002
• Est. Priority Date: 05/26/2000
• Status: Expired due to Term

• Current Assignee: Board of Trustees of The University of Illinois
• Original Assignee: Board of Trustees of The University of Illinois
• Inventors: Webb, Andrew G., Sweedler, Jonathan V.
• Primary Examiner(s): Lefkowitz, Edward
• Assistant Examiner(s): Vargas, Dixomara
• Application Number:
  US09/579,827
• Time in Patent Office: 851 Days
• Field of Search: 324/308, 324/321, 324/318, 324/307, 324/309, 324/310, 324/312, 324/317, 324/303, 324/322, 324/320
• US Class Current: 324/308
• CPC Class Codes: G01R 33/30 Sample handling arrangements, e.g. sample cells, spinning mechanisms

Abstract

An apparatus for obtaining multiple spectra from a plurality of samples through the use of nuclear magnetic resonance (NMR) spectroscopy. A plurality of microcoils are coupled to and are in operable communication with an NMR spectrometer. The coils are operable in both a transmit mode and a receive mode to transmit RF energy to a sample being analyzed and to receive the return data for analysis by the NMR spectrometer. At least one switch is coupled to the plurality of coils and the NMR spectrometer. A controller for the NMR spectrometer is coupled to the switch and is used to control alternative activation of the coils for NMR data acquisition of multiple samples.

Claims

1. An apparatus for obtaining multiple spectra from a plurality of samples by employment of nuclear magnetic resonance (NMR) spectroscopy, comprising:

a plurality of coils coupled to and in operable communication with an NMR spectrometer, said coils operable in a transmit mode and receive mode, and individual coils of the plurality of coils are respectively associated with separate ones of the plurality of samples;

at least one switch coupled with the plurality of coils and the NMR spectrometer; and

a controller of the NMR spectrometer coupled with the at least one switch to alternate activation of the plurality of coils for NMR data acquisition of the separate ones of the plurality of samples such that high resolution NMR spectra are able to be acquired from the separate ones of the plurality of samples.

2. The apparatus of claim 1 in which one of the plurality of coils is activated during a pulse sequence and data acquisition period for analyzing one of the plurality of samples.

3. The apparatus of claim 2 in which another coil of the plurality of coils is activated during a relaxation delay period of the one coil and the other coil is inactive during the one coil'"'"'s activation at the pulse sequence and data acquisition period.

4. The apparatus of claim 1 in which the controller controls the at least one switch to activate one coil at a time such that when one coil is activated each of the other of the plurality of coils are inactive.

5. The apparatus of claim 4 in which each of the coils is respectively associated with a separate one of the plurality of samples for analysis by NMR spectroscopy such that multi-dimensional high resolution NMR spectra are able to be acquired from the separate ones of the plurality of samples.

6. The apparatus of claim 5 in which the plurality of coils are radio frequency (RF) microcoils.

7. The apparatus of claim 6 in which each of the RF microcoils are multi-turn solenoidal coils which are less than one millimeter in length.

8. The apparatus of claim 7 including an NMR probe in operable communication with the NMR spectrometer in which each of the plurality of RF microcoils are positioned within the NMR probe substantially perpendicular to a magnetic field established by the NMR spectrometer such that isolation is less than −

30 dB between the RF microcoils.

13. The apparatus of claim 1 including a plurality of coil groups in which the coil groups each have multiple coils, each of said coils being respectively associated with one of the plurality of samples for analysis by NMR spectroscopy.

9. An apparatus for obtaining multiple spectra from a plurality of samples by employment of nuclear magnetic resonance (NMR) spectroscopy, comprising:

a plurality of coils, said coils are radio frequency (RF) microcoils that are multi-turn solenoidal coils, coupled to and in operable communication with an NMR spectrometer, said coils operable in a transmit mode and receive mode and each of said coils is respectively associated with one of the plurality of samples for analysis by NMR spectroscopy;

at least one switch coupled with the plurality of coils and the NMR spectrometer;

a controller of the NMR spectrometer coupled with the at least one switch to alternate activation of the plurality of coils for NMR data acquisition of multiple samples, the controller controls the at least one switch to activate one coil at a time such that when the one coil is activated each of the other of the plurality of coils are inactive;

an NMR probe in operable communication with the NMR spectrometer in which each of the plurality of RF microcoils are positioned within the NMR probe substantially perpendicular to a magnetic field established by the NMR spectrometer and in which the plurality of RF microcoils are vertically mounted and spaced apart at the probe with alternate ones of the plurality of RF microcoils positioned at approximately 360/n degrees relative to each other about the probe where n=the number of the plurality of microcoils.

10. An apparatus for obtaining multiple spectra from a plurality of samples by employment of nuclear magnetic resonance (NMR) spectroscopy, comprising:

a plurality of coils coupled to and in operable communication with an NMR spectrometer, said coils operable in a transmit mode and receive mode and arranged such that the isolation between the coils is less than −

30 dB;

at least one switch coupled with the plurality of coils and the NMR spectrometer; and

a controller of the NMR spectrometer coupled with the at least one switch to alternate activation of the plurality of coils for NMR data acquisition of multiple samples and in which a sampling rate for individual coils of the plurality of coils is increased relative to a single coil by a factor equal to or greater than the number of coils.

11. The apparatus of claim 10 including means for activating the plurality of coils in a sequential manner to permit complete sampling of data for the plurality of samples in which said data is received by associated ones of the plurality of coils.

12. An apparatus for obtaining multiple spectra from a plurality of samples by employment of nuclear magnetic resonance (NMR) spectroscopy, comprising:

a plurality of coils coupled to and in operable communication with an NMR spectrometer, said coils operable in a transmit mode and receive mode;

at least one switch coupled with the plurality of coils and the NMR spectrometer;

a controller of the NMR spectrometer coupled with the at least one switch to alternate activation of the plurality of coils for NMR data acquisition of multiple samples such that high resolution NMR spectra are able to be acquired from the separate ones of the plurality of samples; and

a plurality of coil groups in which separate coils of the plurality of coil groups are activated by nested switches.

14. An apparatus for obtaining multiple spectra from a plurality of samples by employment of nuclear magnetic resonance (NMR) spectroscopy, comprising:

a plurality of coils coupled to and in operable communication with an NMR spectrometer, said coils operable in a transmit mode and receive mode;

at least one switch coupled with the plurality of coils and the NMR spectrometer;

a controller of the NMR spectrometer coupled with at least one switch to alternate activation of the plurality of coils for NMR data acquisition of multiple samples;

a plurality of coil groups in which the coil groups each have multiple coils, each of said coils being respectively associated with one of the plurality of samples for analysis by NMR spectroscopy such that high resolution NMR spectra are able to be acquired from the separate ones of the plurality of samples; and

a plurality of high-speed switches in which individual high speed switches are respectively associated with a coil group and are coupled with each of the coils of its associated coil group.

15. An apparatus for obtaining multiple spectra from a plurality of samples by employment of nuclear magnetic resonance (NMR) spectroscopy, comprising:

a plurality of coils coupled to and in operable communication with an NMR spectrometer, said coils operable in a transmit mode and receive mode,

at least one switch coupled with the plurality of coils and the NMR spectrometer;

a controller of the NMR spectrometer coupled with at least one switch to alternate activation of the plurality of coils for NMR data acquisition of multiple samples;

a plurality of coil groups in which the coil groups each have multiple coils, each of said coils being respectively associated with one of the plurality of samples for analysis by NMR spectroscopy; and

a plurality of high-speed switches in which individual high speed switches are respectively associated with a coil group and are coupled with each of the coils of its associated coil group and in which an input for each of the individual high-speed switches is coupled with an output of at least one slow switch and in which outputs of the high-speed switches are coupled with the coils associated with individual samples.

16. The apparatus of claim 15 in which the plurality of coils are radio frequency (RF) microcoils.

17. The apparatus of claim 16 in which the (RF) microcoils are multi-turn solenoidal coils.

18. The apparatus of claim 16 in which the controller controls the slow switch to successively switch between high-speed switches coupled with the outputs of the slow switch and in which the controller controls the individual ones of the high-speed switches to activate one microcoil at a time such that when one microcoil is activated, for NMR data acquisition of an associated sample, each of the other microcoils of the coil group are inactive.

19. The apparatus of claim 18 in which the plurality of samples are liquid samples.

20. A method of obtaining multiple spectra from a plurality of samples through nuclear magnetic resonance (NMR) spectroscopy, comprising the steps of.

coupling a plurality of coils which are operable in a transmit mode and a received mode to an NMR spectrometer for operable communication between the coils and the NMR spectrometer;

respectively associating individual coils of the plurality of coils with separate ones of the plurality of samples;

coupling at least one switch with the plurality of coils and the NMR spectrometer; and

controlling the at least one switch to alternate activation of the plurality of coils for NMR data acquisition of the separate ones of the plurality of samples such that high resolution NMR spectra are able to be acquired from the separate ones of the plurality of samples.

21. The method of claim 20 including the step of activating one of the plurality of coils during a pulse sequence and data acquisition period for analyzing one of the plurality of samples.

22. The method of claim 21 including the step of activating another coil of the plurality of coils during a relaxation delay period for the one coil, and

deactivating the other coil during activation at the pulse sequence and data acquisition period for the one coil.

23. The method of claim 20 in which the step of controlling includes the step of controlling, by a controller associated with the NMR spectrometer, the at least one switch to activate one coil at a time such that when one coil is activated each of the other of the plurality of coils are inactive.

24. The method of claim 23 including the step of respectively associating each of the plurality of coils with a corresponding sample of the plurality of samples for analysis by NMR spectroscopy such that multi-dimensional high resolution NMR spectra are able to be acquired from the separate ones of the plurality of samples.

25. The method of claim 24, including the step of establishing the plurality of coils as radio frequency (RF) microcoils.

26. The method of claim 25 in which the step of establishing includes the step of establishing each of the RF microcoils as multi-turn solenoidal coils which are less than one millimeter in length.

27. The method of claim 25 including the steps of providing an NMR probe in operable communication with the NMR spectrometer, and

positioning the plurality of RF microcoils within the NMR probe substantially perpendicular to a magnetic field established by the NMR spectrometer such that isolation is less than −

30 dB between the RF microcoils.

28. A method for obtaining multiple spectra from a plurality of samples through nuclear magnetic resonance (NMR) spectroscopy, comprising the steps of:

coupling a plurality of coils which are operable in a transit mode and a receive mode to an NMR spectrometer for operable communication between the coils and the NMR spectrometer;

coupling at least one switch with the plurality of coils and the NMR spectrometer;

controlling the at least one switch to alternate activation of the plurality of coils for NMR data acquisition of multiple samples, a controller associated with the NMR spectrometer is utilized to control the at least one switch to activate one coil at a time such that when one coil is activated each of the other of the plurality of coils are inactive;

respectively associating each of the plurality of coils with a corresponding sample of the plurality of samples for analysis by NMR spectroscopy;

establishing the plurality of coils as radio frequency (RF) microcoils;

providing an NMR probe in operable communication with the NMR spectrometer;

positioning the plurality of RF microcoils within the NMR probe substantially perpendicular to a magnetic field established by the NMR spectrometer;

vertically spacing the plurality of RF microcoils at the probe; and

positioning alternate ones of the plurality of RF microcoils about the probe at approximately 360/n degrees relative to each other where n=the number of the plurality of microcoils.

29. A method for obtaining multiple spectra from a plurality of samples through nuclear magnetic resonance (NMR) spectroscopy, comprising the steps of:

coupling a plurality of coils which are operable in a transmit mode and a receive mode to an NMR spectrometer for operable communication between the coils and the NMR spectrometer;

arranging the plurality of coils such that the isolation between the coils is less than −

30 dB;

coupling at least one switch with the plurality of coils and the NMR spectrometer;

controlling the at least one switch to alternate activation of the plurality coils for NMR data acquisition of multiple samples; and

increasing a sampling rate for individual coils of the plurality of coils, relative to a sampling rate for a single coil, by a factor equal to or greater than the number of coils.

30. The method of claim 29 including the step of activating the plurality of coils in a sequential manner to permit complete sampling of data for the plurality of samples.

31. A method for obtaining multiple spectra from a plurality of samples through nuclear magnetic resonance (NMR) spectroscopy, comprising the steps of:

coupling a plurality of coils which are operable in a transmit mode and a receive mode to an NMR spectrometer for operable communication between the coils and the NMR spectrometer;

coupling at least one switch with the plurality of coils and the NMR spectrometer;

establishing a plurality of coil groups;

activating separate coils of the plurality of coil groups by at least one nested switch; and

controlling the at least one switch to alternate activation of the plurality coils for NMR data acquisition of multiple samples such that high resolution of NMR spectra are able to be acquired from the separate ones of the plurality of samples.

32. A method for obtaining multiple spectra from a plurality of samples through nuclear magnetic resonance (NMR) spectroscopy, comprising the steps of:

coupling a plurality of coils which are operable in a transmit mode and a receive mode to an NMR spectrometer for operable communication between the coils and the NMR spectrometer;

coupling at least one switch with the plurality of coils and the NMR spectrometer;

controlling the at least one switch to alternate activation of the plurality coils for NMR data acquisition of multiple samples;

establishing a plurality of coil groups; and

respectively associating each of said coils in the plurality of coil groups with a single sample of the plurality of samples for analysis by NMR spectroscopy such that high resolution NMR spectra are able to be acquired from the separate ones of the plurality of samples.

33. The method of claim 32 including the steps of providing a plurality of high-speed switches, said high-speed switches having an input and a plurality of outputs,

associating individual high-speed switches with a coil group, and

coupling the coils of the coil group with the outputs of the associated high-speed switch for the coil group.

34. A method for obtaining multiple spectra from a plurality of samples through nuclear magnetic resonance (NMR) spectroscopy, comprising the steps of:

coupling a plurality of coils which are operable in a transmit mode and a receive mode to an NMR spectrometer for operable communication between the coils and the NMR spectrometer;

coupling at least one switch with the plurality of coils and the NMR spectrometer;

controlling the at least one switch to alternate activation of the plurality coils for NMR data acquisition of multiple samples;

establishing a plurality of coil groups;

respectively associating each of said coils in the plurality of coil groups with a single sample of the plurality of samples for analysis by NMR spectroscopy;

providing a plurality of high-speed switches, said high-speed switches having an input and a plurality of outputs;

associating individual high-speed switches with a coil group;

coupling the coils of the coil group with the outputs of the associated high-speed switch for the coil group;

coupling the input for individual high-speed switches with an assigned output of at least one slow switch; and

coupling an input of the at least one slow switch with the NMR spectrometer.

35. The method of claim 34 including the step of establishing the plurality of coils as radio frequency (RF) microcoils.

36. The method of claim 35 including the step of establishing the RF microcoils as multi-turn solenoidal coils.

37. The method of claim 35 including the step of controlling the at least one slow switch to successively switch between each of the plurality of high-speed switches coupled with the outputs of the at least one slow switch, and

controlling one of the high-speed switches, when in switched communication with the slow switch, to activate one microcoil at a time of the coil group for the one high-speed switch such that when one microcoil is activated, for NMR data acquisition of a sample associated with the one microcoil, each of the other microcoils of the coil group are inactive.