Optimized MRI strip array detectors and apparatus, systems and methods related thereto
Featured is a device for NMR or MRI signals from excited nuclei as well as related apparatus, systems and methods. The device includes a strip array antenna including one or more conductor and N reactive tuning components, where N is an integer ≧1 at least one of the N reactive components is electrically coupled to each of the one or more conductors as well as to ground/virtual ground. The apparent electrical length of the conductors is tuned with the reactive tuning components so it is equal to be about nλ/4, where n is an integer ≧1 and λ is the wavelength of the signal to be detected. The length of the strip also is such as to be substantially in the approximate range of 1.3 times the depth of interest. The strip conductors are also combined with loop coils to form quadrature detectors.
1. A quadrature MRI detector, comprising
a loop antenna; and
a strip antenna, the strip antenna including:
at least one conducting member extending lengthwise,
a ground conducting member, and
a first dielectric portion disposed between the at least one conducting member and the ground member so as to separate and displace the at least one conducting member relative to the ground member.
2. The quadrature MRI detector of claim 1 , wherein:
a length of the at least one conductor is substantially in the approximate range of about 1.3 times said depth of interest of a specimen,
the at least one conducting member is tuned to resonate at a desired MRI frequency,
a radius of the loop antenna is substantially in the approximate range of about the depth of interest divided by √5, and
the loop is tuned to resonate at a desired MRI frequency.
3. The quadrature MRI detector of claim 1 , further comprising a plurality of quadrature elements that arranged so as to form a one -dimensional array of quadrature elements.
4. The quadrature MRI detector of claim 3 , wherein at least two of the plurality of quadrature elements have geometries that are optimized for different depths.
5. The quadrature MRI detector of claim 3 , wherein the one-dimensional array of quadrature elements are flexible so as to conform to the shape of the sample, subject or patient being imaged.
6. The quadrature MRI detector of claim 1 , further comprising a plurality of quadrature elements that are arranged so as to form a two-dimensional array of quadrature elements.
7. The quadrature MRI detector of claim 6 , wherein at least two of the a plurality of quadrature elements have geometries that are optimized for different depths.
8. The quadrature MRI detector of claim 6 , wherein the two-dimensional array of quadrature elements are flexible so as to conform to the shape of the specimen, subject or patient being imaged.
9. A quadrature MRI detector, comprising;
at least one quadrature element, each of the at least one quadrature element including a loop antenna; and a strip antenna;
wherein the strip antenna includes:
at least one conducting member,
a ground conducting member,
a first dielectric portion disposed between the at least one conducting member and the ground member so as to separate and displace the at least one conducting member relative to the ground member.
10. The quadrature MRI detector of claim 9 , wherein:
a length of the at least one conductor is substantially in the approximate range of about 1.3 times said depth of interest of a specimen,
the at least one conducting member is tuned to resonate at a desired MRI frequency,
a radius of the loop antenna is substantially in the approximate range of about the depth of interest divided by √5, and
the loop is tuned to resonate at a desired MRI frequency.