1. RF transmit andor receive antenna, in particular for use in a hybrid magnetic resonance imaging (MRI) system which comprises a high intensity focused ultrasound (HIFU) system, wherein the RF transmit andor receive antenna comprises a conductor structure which only minimally disturbs the ultrasound field or beams, generated by the HIFU system, by providing the conductive structure transparent to the ultrasound field or beams.
2. RF transmit andor receive antenna according to claim 1, wherein the transparency to the ultrasound field or beams is achieved by
a material of the conductor structure has an effective acoustic thickness of less than about one-tenth of a wavelength of the ultrasound field or beams.
3. RF transmit andor receive antenna according to claim 1, wherein the conductor structure is formed by a multilayer laminate or PCB structure.
4. RF transmitand or receive antenna according to claim 3 wherein the conductor structure comprises a thin copper strip having a copper thickness of less than 50 \u03bcm between a first and a second thin plastic sheet having a plastic thickness of less than 100 \u03bcm.
5. RF transmit andor receive antenna according to claim 1, wherein the conductive structure only minimally disturbs the ultrasound field beams, further by providing the conductive structure reflective to the ultrasound field beams by one or a combination of the following features:
the area covered by the conductor structure when projected from an ultrasound focus on an ultrasound transducer (11) is sufficiently minimized;
the location of the conductor structure is chosen to sufficiently minimize the effect on the ultrasound field or beams;
the shape of the conductor structure is chosen to spread the reflected ultrasound field or beams evenly in order to avoid creating unwanted additional focuses from the reflected ultrasound field or beams.
6. RF transmit andor receive antenna according to claim 1, comprising a first coil structure (13a, 13b) which at least partially extends across an ultrasound window (12) of the HIFU system.
7. RF transmit andor receive antenna according to claim 1, which is provided in the form of a whole body coil for use in a vertical or an axial MRI system.
8. RF transmit andor receive antenna according to claim 1, which is provided in the form of a surface coil or birdcage coil or breast coil.
9. Hybrid MRI system comprising an MRI system and a HIFU system and an RF transmit andor receive antenna according to claim 1.
10. RF transmit andor receive antenna according to claim 1, wherein the transparency to the ultrasound field or beams is achieved by a thickness of the conductor structure chosen to sufficiently minimize the reflections at an ultrasound coupling medium by acoustic matching.
11. RF transmit andor receive antenna according to claim 1, wherein the transparency to the ultrasound field or beams is achieved by a the material of the conductor structure chosen to have sufficiently low acoustic losses in order to avoid significant absorption of the ultrasound energy.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A fixing bracket for signal connector, adapted for fixing a signal connector to a circuit board, wherein the circuit board comprises an assembling hole, the signal connector comprises a body and two protruding portions symmetrically protruding from the body, each of the protruding portions has two opposite first surfaces, the body has two opposite second surfaces and two opposite third surfaces, each of the first surfaces, each of the second surfaces and each of the third surfaces are perpendicular to one another, the fixing bracket for signal connector comprising:
a base, comprising a top surface and a bottom surface opposite to each other;
at least one fixing member, protruding from the bottom surface of the base, wherein each of the at least one fixing member is adapted to pass through the assembling hole from a surface of the circuit board and interfere with another surface of the circuit board; and
two engaging sets, protruding from the top surface of the base, each of the two engaging sets comprising at least one first restricting surface perpendicular to the top surface, at least one second restricting surface perpendicular to the top surface, and a third restricting surface parallel to the top surface, and the at least one first restricting surface adjacent to the at least one second restricting surface, wherein the two at least one first restricting surfaces of the two engaging sets are adapted to respectively at least contact one of the two first surfaces of each of the two protruding portions of the signal connector, the two first surfaces which contact the two at least one first restricting surfaces of the two engaging sets are not coplanar, the two at least one second restricting surfaces of the two engaging sets are adapted to respectively contact the two second surfaces of the signal connector, and the two third restricting surfaces of the two engaging sets and the top surface are adapted to respectively contact the two third surfaces of the signal connector, so as to fix the signal connector.
2. The fixing bracket for signal connector as claimed in claim 1, wherein each of the two engaging sets is a hook-shaped flexible arm, and the two engaging sets are staggered, such that projections of the two at least one second restricting surfaces projecting onto a surface on which any one of the two at least one second restricting surfaces exists are not overlapped to each other.
3. The fixing bracket for signal connector as claimed in claim 1, wherein each of the two engaging sets comprises two hook-shaped flexible arms, and the two engaging sets are disposed oppositely.
4. The fixing bracket for signal connector as claimed in claim 1, wherein each of the two engaging sets comprises a hook-shaped flexible arm and an engaging slot located at a side of the hook-shaped flexible arm, the two hook-shaped flexible arms are staggered and the two engaging slots are disposed opposite to each other, each of the engaging slots extends away from the top surface, and the at least one first restricting surface is one of innerwall surfaces of the engaging slot.
5. The fixing bracket for signal connector as claimed in claim 1, wherein each of the two engaging sets comprises two hook-shaped flexible arms and an engaging slot, the engaging slot is located between the two hook-shaped flexible arms and extends away from the top surface, the at least one first restricting surface is one of innerwall surfaces of the engaging slot, and the two engaging sets are disposed oppositely.
6. The fixing bracket for signal connector as claimed in claim 1, further comprising a positioning protruding block protruding from the bottom surface of the base, and the circuit board further comprising a positioning hole corresponding to the positioning protruding block.
7. The fixing bracket for signal connector as claimed in claim 1, wherein each of the at least one fixing member comprises an end portion which is away from the bottom surface and at least two flexible segment portions, the at least two flexible segment portions are averagely disposed around the end portion and extend toward the bottom surface, a maximum outer diameter of the at least two flexible segment portions is W mm, a diameter of the assembling hole is D mm, wherein D mm<W mm\u2266D+0.2 mm.
8. The fixing bracket for signal connector as claimed in claim 7, wherein a number of the at least one fixing member is two, each of the at least one fixing member comprises two flexible segment portions, a connecting line of the two flexible segment portions of one of the two fixing members intersects a connecting line of the two flexible segment portions of the other of the two fixing members.
9. The fixing bracket for signal connector as claimed in claim 1, wherein a diameter of the assembling hole is D mm, and 3.3 mm<D<3.7 mm.
10. The fixing bracket for signal connector as claimed in claim 1, wherein the signal connector is an optical fiber signal connector.