Method and apparatus for magnetic resonance imaging and heating tissues

• US 5,323,778 A
• Filed: 11/05/1991
• Issued: 06/28/1994
• Est. Priority Date: 11/05/1991
• Status: Expired due to Fees

• Current Assignee: Brigham and Women's Hospital Incorporated
• Original Assignee: Brigham and Women's Hospital Incorporated
• Inventors: Jakab, Peter, Kandarpa, Krishna
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): Casler, Brian L.
• Application Number:
  US07/786,879
• Time in Patent Office: 966 Days
• Field of Search: 128/653.2, 128/653.5, 128/736, 607/154, 607/113, 607/97, 607/101, 607/102, 606/28, 606/29, 606/31, 606/33-35, 606/41
• US Class Current: 600/411
• CPC Class Codes: A61B 2090/374 NMR or MRI
• CPC Class Codes: A61F 2007/009 with a varying magnetic field acting upon the human body, e.g. an implant therein
• CPC Class Codes: A61F 7/00 Heating or cooling appliances for medical or therapeutic treatment of the human body heating or cooling means in connection with bedsteads or mattresses A47C21/00 ; massage, therapeutic baths A61H; hyperthermia using electric or magnetic fields or ultrasound A61N; electric heating elements H05B
• CPC Class Codes: G01R 33/31 Temperature control thereof
• CPC Class Codes: G01R 33/4804 Spatially selective measurement of temperature or pH

Abstract

The present invention relates to apparatus and a method for imaging and heating body tissues with one probe, through use of a magnetic resonance imaging radio frequency source. The device may also be configured with a thermocouple to provide temperature-controlled heat therapy with sufficient image definition to control that therapy.

Claims

1. Apparatus for magnetic resonance imaging and heating of tissues, comprising:

means for imaging including a magnetic resonance imaging radio frequency radiation source;

a probe comprising a magnetic resonance imaging coil, said imaging coil receiving an emission spectra from said tissues produced by radiation from said magnetic resonance imaging radio frequency radiation source thereby producing a signal representing an image of said tissues;

means for heating said tissues disposed at lest partially within said probe, wherein said heating means uses said radiation to generate heat, and wherein said means for heating said tissues comprises a wire pair such that said wire pair contains a first end with said first end of said wire pair being welded; and

signal output means for transmitting said signal out of said probe.

2. Apparatus according to claim 1, wherein said probe further comprises a thermocouple to detect temperature.

3. Apparatus for magnetic resonance imaging and heating of tissues, comprising:

means for imaging including a magnetic resonance imaging radio frequency radiation source;

a catheter comprising a probe wherein said probe comprises a magnetic resonance imaging coil, said imaging coil receiving an emission spectra from said tissues produced by radiation from said magnetic resonance imaging radio frequency radiation source producing a signal representing an image of said tissues, and a thermocouple to detect temperature;

signal output means for transmitting said signal out of said catheter;

and means for heating said tissues wherein said heating means uses said radiation to generate heat.

4. Apparatus according to claim 3, wherein said means for heating said tissues comprises means for grounding tissue eddy currents induced by radiation from said magnetic resonance imaging radio frequency radiation source.

5. Apparatus according to claim 3, further comprising a coaxial cable disposed at lest partially within said probe such that said imaging coil produces a signal which is impedance matched for carrying by said coaxial cable and, wherein said thermocouple produces a signal for carrying by said coaxial cable.

6. Apparatus according to claim 3, wherein said means for heating further comprises means for controlling said heating by detecting temperature.

7. Method for magnetic resonance imaging and heating of tissues, comprising the steps of:

introducing a catheter into a body to a location proximate to the tissues to be heated;

imaging said tissues using a means for imaging which includes a magnetic resonance imaging radio frequency radiation source and a probe contained within said catheter, said probe comprising a magnetic resonance imaging coil, said imaging coil receiving an emission spectra from said tissues produced by radiation from said magnetic resonance imaging radio frequency radiation source thereby producing a signal representing an image of said tissues;

transmitting said signal out of said catheter using signal output means;

heating said tissues with heating means, wherein said heating means uses said radiation to generate heat; and

controlling said heating step by use of said probe, wherein said probe further comprises a thermocouple to detect temperature.

8. Method according to claim 7, wherein said heating step is performed with mans for grounding tissue eddy currents induced by said radiation.

9. Method according to claim 7, further comprising the step of:

selecting the frequency of operation of said imaging coil, said imaging coil being adjustable over a multiplicity of frequencies.

10. Method according to claim 7, wherein said heating step is performed with heating means which comprises a wire pair such that said wire pair contains a first end with said first end of said wire pair being welded.

11. Method for magnetic resonance imaging and heating of tissues, comprising the steps of:

introducing a catheter into a body to a location proximate to the tissues to be heated;

imaging said tissues using a means for imaging which includes a magnetic resonance imaging radio frequency radiation source and a probe contained within said catheter, said probe comprising a magnetic resonance imaging coil, said imaging coil receiving an emission spectra from said tissues produced by radiation from said magnetic resonance imaging radio frequency radiation source thereby producing a signal representing an image of said tissues;

transmitting said signal out of said catheter using signal output means;

heating said tissues with heating means, wherein said heating means uses said radiation to generate heat, wherein said heating step is performed at a temperature sufficient to create an occlusion.

12. Method for magnetic resonance imaging and heating of tissues, comprising the steps of:

introducing a catheter into a body to a location proximate to the tissues to be heated;

imaging said tissues using a means for imaging which includes a magnetic resonance imaging radio frequency radiation source and a probe contained within said catheter, said probe comprising a magnetic resonance imaging coil, said imaging coil receiving an emission spectra from said tissues produced by radiation from said magnetic resonance imaging radio frequency radiation source thereby producing a signal representing an image of said tissues;

transmitting said signal out of said catheter using signal output means;

heating said tissues with heating means, wherein said heating means uses said radiation to generate heat; and

detecting temperature with a thermocouple disposed within said probe.

13. Method for magnetic resonance imaging and heating of tissues, comprising the steps of:

introducing a catheter into a body to a location proximate to the tissues to be heated;

imaging said tissues using a means for imaging which includes a magnetic resonance imaging radio frequency radiation source and a probe contained within said catheter, said probe comprising a magnetic resonance imaging coil, said imaging coil receiving an emission spectra from said tissues produced by radiation from said magnetic resonance imaging radio frequency radiation source thereby producing a signal representing an image of said tissues;

transmitting said signal out of said catheter using signal output means;

heating said tissues with heating means, wherein said heating means uses said radiation to generate heat, wherein said heating step is performed with heating means which comprises a wire pair such that said wire pair contains a first end with said first end of said wire pair being welded.

14. Method according to claim 13, further comprising the step of:

detecting temperature with a thermocouple disposed within said probe.

15. Method for magnetic resonance imaging and heating of tissues, comprising the steps of:

introducing a catheter into a body to a location proximate to the tissues to be heated;

imaging said tissues using a means for imaging which includes a magnetic resonance imaging radio frequency radiation source and a probe contained within said catheter, said probe comprising a magnetic resonance imaging coil, said imaging coil receiving an emission spectra from said tissues produced by radiation from said magnetic resonance imaging radio frequency radiation source thereby producing a signal representing an image of said tissues;

transmitting said signal out of said catheter using signal output means;

heating said tissues with heating means, wherein said heating means uses said radiation to generate heat, wherein said heating step is performed with means for grounding tissue eddy currents induced by said magnetic resonance imaging radio frequency radiation.