Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1994-03-15
1996-03-05
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01V 314
Patent
active
054970890
ABSTRACT:
An insertable coil (40) is inserted in a bore (12) of a magnetic resonance imaging apparatus. Primary field magnets (10) create a temporally constant magnetic field longitudinally through the insertable coil. A computer control (58) controls a radio frequency coil (44) and a gradient coil (42) to create magnetic resonance imaging sequences and process received magnetic resonance signals into image representations. The insertable gradient coil includes a central cylindrical portion (60) having a first circumference. A second portion (62) disposed toward a patient receiving end of the insertable coil has a second circumference which is larger than the first circumference. In this manner, the first, smaller circumferential portion is adapted to receive the patient's head and the larger circumferential portion is adapted to accommodate the patient's shoulders. For symmetry which eliminates magnetic field induced torques, a service end (68) matches and is symmetric to the patient end (62). The z-gradient coil windings (FIG. 3), and x and y-gradient coil windings (FIGS. 4 or 5) are mounted such that a portion of the windings are on the first, smaller circumferential portion and a portion of the windings are on the larger patient and service end portions.
REFERENCES:
patent: 4758813 (1988-07-01), Holsinger et al.
patent: 4878023 (1989-10-01), Overweg et al.
patent: 5177442 (1993-01-01), Roemer
patent: 5185576 (1993-02-01), Varek et al.
patent: 5185577 (1993-02-01), Minemura
patent: 5278504 (1994-01-01), Patrick
patent: 5378989 (1995-01-01), Barber
"Compact Magnet and Gradient System for Breast Imaging", Pissanetzky, et al., SMRM 12th Annual Meeting, p. 1304 (1993).
"High-Order, Multi-Dimensional Design of Distributed Surface Gradient Coil", Oh, et al., SMRM 12th Annual Meeting, p. 1310.
"NMR Imaging in Biomedicine, Supplement 2," Mansfield, et al., pp. 268-269 (1982).
Lampman David A.
Morich Michael A.
Petropoulos Labros
Haynes Mack
O'Shea Sandra L.
Picker International Inc.
LandOfFree
Wide aperture gradient set does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wide aperture gradient set, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wide aperture gradient set will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1415146