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SQUID-Detected MRI in the Limit of Zero Static Field
This thesis describes an implementation of the so-called"zero-field MRI" (ZFMRI) pulse sequence, which allows for imaging in an arbitrarily low B<sub>0</sub> field. The ZFMRI sequence created an effective unidirectional gradient field by using a train of pi pulses to average out the concomitant gradient components during encoding. The signals were acquired using a low-transition temperature dc Superconducting QUantum Interference Device (low-Tc dc SQUID) coupled to a first-order axial gradiometer. The experiments were carried out in a liquid helium dewar which was magnetically shielded with a single-layer mu-metal can around the outside and a superconducting Pb can contained within the helium space. We increased the filling factor of the custom-made, double-walled Pyrex insert by placing the liquid alcohol sample, at a temperature of approximately -50 degrees C, at the center of one loop of the superconducting gradiometer, which was immersed in the helium bath.
Date:
December 14, 2009
Creator:
Kelso, Nathan Dean
System:
The UNT Digital Library
Nonlinear vibrational spectroscopy of surfactants at liquid interfaces
None
Date:
December 14, 1998
Creator:
Miranda, P.B.
System:
The UNT Digital Library
The Discrepancies of Kant and Camus: Relating to the world
Thesis written by a student in the UNT Honors College comparing the philosophies and ethics of Albert Camus and Immanuel Kant.
Date:
December 14, 1999
Creator:
Thompson, Michael
System:
The UNT Digital Library
Interactive computer graphics system applied to the life sciences
None
Date:
December 14, 1973
Creator:
Watson, C R
System:
The UNT Digital Library