Whole body MRI resonator
First Claim
1. A magnetic resonance imaging apparatus comprising:
- a magnetic field means generating a magnetic field longitudinally through an image region;
an electrically conductive liner extending longitudinally and around the image region;
a resonator coil assembly including a first coil portion and a second coil portion, the resonator coil assembly being disposed in the conductive liner;
first and second tuning capacitances electrically connected with the first and second coil portions, respectively;
first and second matching capacitances electrically connected between the first and second tuning capacitances, respectively, and the electrically conductive liner; and
,a radio frequency lead electrically connected with (1) a first junction between the first matching and tuning capacitances and (2) a second junction between the second matching and tuning capacitances.
1 Assignment
0 Petitions
Accused Products
Abstract
A resonator coil assembly (32) includes a dielectric sleeve (40) on which a first resonator coil portion (42) and a second resonator coil portion (44), each of copper foil, are adhered. The dielectric sleeve is dimensioned to receive a human torso therein and in one embodiment (FIG. 1) is circular in cross section and in another (FIG. 4) is elliptical in cross section. A pair of adjustable tuning capacitances (64, 66) and a pair of adjustable matching capacitances (68, 70) are interconnected between one end of the each coil portion and a metal bore liner (54). An opposite end of the coil portions are capacitively coupled to each other (FIG. 1) or to the bore liner (FIG. 3). A half wave length cable (72) interconnects the junctions between the first and second tuning and matching capacitances. One of these junctions is connected by a cable (74) with a radio frequency generator (30) and a radio receiver (34).
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Citations
30 Claims
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1. A magnetic resonance imaging apparatus comprising:
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a magnetic field means generating a magnetic field longitudinally through an image region; an electrically conductive liner extending longitudinally and around the image region; a resonator coil assembly including a first coil portion and a second coil portion, the resonator coil assembly being disposed in the conductive liner; first and second tuning capacitances electrically connected with the first and second coil portions, respectively; first and second matching capacitances electrically connected between the first and second tuning capacitances, respectively, and the electrically conductive liner; and
,a radio frequency lead electrically connected with (1) a first junction between the first matching and tuning capacitances and (2) a second junction between the second matching and tuning capacitances. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A magnetic resonance imaging apparatus comprising:
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a magnetic field means generating a magnetic field longitudinally through an image region; an electrically conductive liner extending longitudinally and around the image region; a first coil portion disposed within the conductive liner and displaced therefrom; a first impedance network electrically connected between a first end of the coil portion and the conductive liner; a first capacitance means for defining electrical capacitance between a second end of the coil portion and the conductive liner; a radio frequency lead operatively connected between the first impedance network and a receiver means for receiving magnetic resonance signals from the first coil portion; and
,an image reconstruction means for reconstructing an image representation from the received magnetic resonance signals. - View Dependent Claims (12)
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13. A magnetic resonance imaging apparatus comprising:
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a magnetic field means for generating a magnetic field longitudinally through an image region; a resonance coil former including a sleeve of dielectric material dimensioned to receive a human patient'"'"'s torso therein, the former extending longitudinally along the magnetic field; a first electrically conductive resonator coil portion disposed along the former; a second electrically conductive resonator coil portion disposed along the former; first and second matching capacitive networks, the first matching capacitive network being electrically connected between the first coil portion and a ground means and the second matching capacitive network being electrically connected between the second coil portion and the ground means; and
,a radio frequency lead connected with at least the first matching capacitive network such that a capacitive coupling is provided between the radio frequency lead and the first coil portion. - View Dependent Claims (14, 15, 16, 17, 18, 21)
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19. A magnetic resonance imaging apparatus comprising:
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a magnetic field means for generating a magnetic field longitudinally through an image region; a resonance coil former including a sleeve of dielectric material dimensioned to receive a human patient'"'"'s torso therein, the former extending longitudinally along the magnetic field; a first electrically conductive resonator coil portion disposed along the former; a second electrically conductive resonator coil portion disposed along the former; a first tuning capacitance electrically connected with the first coil portion; a first matching capacitance operatively connected between the first tuning capacitance and a ground means; a second tuning capacitance electrically connected with the second coil portion; a second matching capacitance operatively connected between the second tuning capacitance and the ground means; and
,a half wave length cable which is connected at one end with a junction between the first matching and tuning capacitances and at its other end at a junction between the second matching and tuning capacitances. - View Dependent Claims (20)
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22. A whole body, half wave length balanced transmission line resonator comprising:
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a dielectric sleeve having generally a 1;
1 ratio between a length and a major diameter thereof;a first metal foil portion extending along a surface of the dielectric sleeve; a second metal foil portion extending along the surface of the dielectric sleeve, the first and second foil portions being mirror images of each other and electrically isolated from each other; first and second matching capacitance networks for capacitively coupling one end of the first and second foil portions with ground; a half wave length cable connected between the first and second capacitance networks; and
,a capacitance coupling means for capacitively coupling a second end of the first and second foil portions.
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23. A magnetic resonance apparatus comprising:
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a magnetic field means generating a magnetic field longitudinally through an image region; an electrically conductive liner extending longitudinally and around the image region; a lumbar supporting former disposed within the conductive liner; a lumbar coil portion operatively connected with the lumbar supporting former; an impedance network electrically connected with a first end of the lumbar coil portion, with the liner, and with a transmission lead; a first capacitance means for defining electrical capacitance between a second end of the lumbar coil portion and the conductive liner. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A magnetic resonance imaging apparatus comprising:
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a magnetic field means for generating a magnetic field longitudinally through an image region; a tubular, electrically conductive liner extending longitudinally and around the image region a resonance coil former of dielectric material dimensioned to receive a human patient'"'"'s torso therein, the former extending longitudinally along the magnetic field; an electrically conductive resonator coil mounted on the former; first matching capacitive network electrically connected between the resonator coil and the conductive liner.
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30. A magnetic resonance imaging apparatus comprising:
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a magnetic field means for generating a magnetic field longitudinally through an image region; a resonance coil former of dielectric material dimensioned to receive a human patient'"'"'s torso therein, the former extending longitudinally along the magnetic field; a first electrically conductive resonator coil portion disposed along the former; a second electrically conductive resonator coil portion disposed electrically along the former; first and second matching capacitive networks, the first matching capacitive network being electrically connected between the first coil portion and a ground means and the second matching capacitive network being electrically connected between the second coil portion and the ground means; and
,a radio frequency conductor connected between the first and second matching capacitance networks.
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Specification