Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1996-11-26
2000-02-29
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
600410, G01V 300
Patent
active
060313757
ABSTRACT:
A method of magnetic resonance imaging employs cylindrical coordinates and in one embodiment has an elongated catheter which is operatively associated with an RF pulse transmitting antenna and an RF pulse transmitting body coil. A main magnetic field is imposed on the region of interest. Circumferential phase encoding is accomplished by applying an initial RF pulse from either the catheter antenna or the body coil and subsequently applying an initial series of RF pulses with the source alternating between the antenna and the body coil. Radial phase encoding is effected by applying a first RF pulse which in a second embodiment is followed by a second RF pulse. A longitudinal gradient magnetic pulse is applied in the region of interest to spatially encode magnetic resonance signals. The cylindrical coordinate imaging is obtained by combining the circumferential phase encoding information the longitudinal magnetic encoding information with or without the radial phase encoding information. Other embodiments not employing catheter antennas employ two antennas with non-uniform phase profiles with the pulse sequences employed with the antennas. Corresponding apparatus is provided.
REFERENCES:
patent: 4766381 (1988-08-01), Conturo et al.
patent: 5099208 (1992-03-01), Fitzpatrick et al.
patent: 5352979 (1994-10-01), Conturo
patent: 5447156 (1995-09-01), Dumoulin et al.
patent: 5512825 (1996-04-01), Atalar et al.
patent: 5715822 (1998-02-01), Watkins et al.
D.I.Hoult, "Rotating Frame Zeugmatography", Phil. Trans. R. Soc. Lond., (1980), B289, pp. 543-547, Great Britain.
M. Garwood et al., "Magnetic Resonance Imaging With Adiabatic Pulses Using a Single Surface Coil for RF Transmission and Signal Dectection", Magnetic Resonance In Medicine, (1989), 9, pp. 25-34, USA.
Atalar Ergin
Ocali Ogan
Arana Louis
The Johns Hopkins University
Wurm Mark A.
LandOfFree
Method of magnetic resonance analysis employing cylindrical coor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of magnetic resonance analysis employing cylindrical coor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of magnetic resonance analysis employing cylindrical coor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-686303