Device and method for preventing magnetic resonance imaging induced damage

• US 20040199069A1
• Filed: 04/02/2003
• Published: 10/07/2004
• Est. Priority Date: 04/02/2003
• Status: Abandoned Application

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Connelly, Patrick R., Helfer, Jeffrey L.
• Application Number:
  US10/405,154
• Publication Number:
  US 20040199069A1
• Time in Patent Office: Days
• US Class Current: 600/412
• CPC Class Codes: A61N 1/086 Magnetic resonance imaging [MRI] compatible leads
• CPC Class Codes: G01R 33/285 Invasive instruments, e.g. catheters or biopsy needles, specially adapted for tracking, guiding or visualization by NMR
• CPC Class Codes: G01R 33/288 Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room
• CPC Class Codes: G01R 33/4804 Spatially selective measurement of temperature or pH
• CPC Class Codes: Y10T 428/24322 Composite web or sheet
• CPC Class Codes: Y10T 428/24331 including nonapertured component

Abstract

An electromagnetic shield has a first patterned or apertured layer having non-conductive materials and conductive material and a second patterned or apertured layer having non-conductive materials and conductive material. The conductive material may be a metal, a carbon composite, or a polymer composite. The non-conductive materials in the first patterned or apertured layer may be randomly located or located in a predetermined segmented pattern such that the non-conductive materials in the first patterned or apertured layer are located in a predetermined segmented pattern with respect to locations of the non-conductive materials in the second patterned or apertured layer.

Claims

1. A magnetic-resonance imaging process, comprising:

(a) imaging a tissue region according to an image acquisition sequence; and

(b) adjusting the image acquisition sequence, in response to a predetermined parameter, to allow for cooling of the imaged tissue region.

2. The magnetic-resonance imaging process as claimed in claim 1, wherein the predetermined parameter is a relative temperature change of the tissue region being imaged.

3. The magnetic-resonance imaging process as claimed in claim 1, wherein the predetermined parameter is a specific absorption ratio at the tissue region being imaged.

4. The magnetic-resonance imaging process as claimed in claim 1, further comprising:

(c) measuring a temperature change of the tissue region being imaged; and

(d) determining if the measured temperature change is above a predetermined threshold;

the image acquisition sequence being automatically adjusted in response to the measured temperature change being determined to be above the predetermined threshold.

5. The magnetic-resonance imaging process as claimed in claim 1, further comprising:

(c) measuring a temperature change of the tissue region being imaged; and

(d) displaying the measured temperature change;

the image acquisition sequence being manually adjusted in response to the displayed measured temperature change being above a predetermined threshold.

6. The magnetic-resonance imaging process as claimed in claim 1, further comprising:

(c) measuring a temperature change of the tissue region being imaged; and

(d) determining if the measured temperature change is above a predetermined threshold;

the image acquisition sequence being automatically halted in response to the measured temperature change being determined to be above the predetermined threshold until the measured temperature change falls below the predetermined threshold.

7. The magnetic-resonance imaging process as claimed in claim 1, further comprising:

(c) measuring a temperature change of the tissue region being imaged; and

(d) displaying the measured temperature change;

the image acquisition sequence being manually halted in response to the measured temperature change being determined to be above the predetermined threshold until the measured temperature change falls below the predetermined threshold.

8. The magnetic-resonance imaging process as claimed in claim 1, further comprising:

(c) measuring a specific absorption ratio of the tissue region being imaged; and

(d) determining if the measured specific absorption ratio is above a predetermined threshold;

the image acquisition sequence being automatically adjusted in response to the measured specific absorption ratio being determined to be above the predetermined threshold.

9. The magnetic-resonance imaging process as claimed in claim 1, further comprising:

(c) measuring a specific absorption ratio of the tissue region being imaged; and

(d) displaying the measured specific absorption ratio;

the image acquisition sequence being manually adjusted in response to the displayed measured specific absorption ratio being above a predetermined threshold.

10. The magnetic-resonance imaging process as claimed in claim 1, wherein the predetermined parameter is an absolute temperature change of the tissue region being imaged.

11. The magnetic-resonance imaging process as claimed in claim 10, wherein the predetermined parameter is an absolute temperature change of the tissue region being imaged.