PSEUDO-BIRDCAGE COIL WITH VARIABLE TUNING AND APPLICATIONS THEREOF
A coil for single-sided magnetic resonance imaging is disclosed. The coil is configured to generate a magnetic field outwards away from the coil. The coil includes a first ring and a second ring having different diameters and the current flows through the coil to generate the magnetic field in a region of interest. A method of imaging via a magnetic imaging apparatus is also disclosed. The method includes providing a power source and providing a coil that includes a first ring and a second ring having different diameters. The method includes turning on the power source so as to flow a current through the coil to generate a magnetic field in a region of interest. The method also includes selectively turning on a particular set of electronic components so as to pulse the magnetic field in a narrower frequency range.
1 . (canceled)
2 . A method of operating a magnetic imaging apparatus comprising:
a. flowing a current through a coil comprising a plurality of rings, wherein a first ring of the plurality of rings has a smaller diameter than a second ring of the plurality of rings, wherein the first ring is spaced farther from a region of interest than the second ring, wherein the region of interest is outside of a region enclosed by the coil;
b. generating an electromagnetic field in the region of interest; and
c. generating a magnetic resonance image based on the region of interest.
3 . The method of claim 2 , wherein the electromagnetic field is from about 1 μT to about 10 mT.
4 . The method of claim 2 , further comprising pulsing the electromagnetic field at a radio frequency from about 1 kHz to about 2 GHz.
5 . The method of claim 2 , wherein the first ring is connected to the second ring via one or more rungs that form a single current loop.
6 . The method of claim 2 , wherein the first ring is connected to the second ring via one or more capacitors that form a single current loop.
7 . The method of claim 2 , wherein the coil is non-planar and oriented to partially surround the region of interest.
8 . The method of claim 2 , wherein one of the first ring or the second ring is tilted with respect to the other ring.
9 . The method of claim 2 , wherein the first ring and the second ring comprise different materials.
10 . The method of claim 2 , wherein the first ring and the second ring comprise the same materials.
11 . The method of claim 2 , wherein the diameter of the first ring is between a diameter of the region of interest and a diameter of the second ring.
12 . The method of claim 2 , further comprising tuning the electromagnetic field.
13 . The method of claim 12 , wherein the coil comprises one or more electronic components for tuning the electromagnetic field.
14 . The method of claim 13 , wherein the one or more electronic components include at least one of a varactor, a PIN diode, a dielectric, a capacitor, an inductor, a MEMS switch, a solid state relay, or a mechanical relay.
15 . The method of claim 13 , wherein tuning the electromagnetic field comprises changing the current of the one or more electronic components or by changing physical locations of the one or more electronic components.
16 . The method of claim 13 , further comprising pulsing the electromagnetic field in a narrower frequency range via selectively turning on or off the one or more electronic components.
17 . The method of claim 12 , wherein tuning the electromagnetic field comprises adjusting a spatial separation and an overlap of the first ring and the second ring.
18 . The method of claim 2 , wherein the magnetic imaging apparatus comprises a single-sided magnetic imaging apparatus.
19 . The method of claim 2 , wherein the first ring and the second ring are coaxial and spaced apart co-axially along a central axis.
20 . The method of claim 2 , further comprising generating a large bandwidth frequency range by combining multiple center frequencies of smaller bandwidth frequency ranges.
21 . The method of claim 20 , wherein the coil is configured to generate the large bandwidth frequency range.