Methods and apparatus for patient positioning in magnetic resonance imaging
According to some aspects, a magnetic resonance imaging system capable of imaging a patient is provided. The magnetic resonance imaging system comprising at least one B0 magnet to produce a magnetic field to contribute to a B0 magnetic field for the magnetic resonance imaging system and a member configured to engage with a releasable securing mechanism of a radio frequency coil apparatus, the member attached to the magnetic resonance imaging system at a location so that, when the member is engaged with the releasable securing mechanism of the radio frequency coil apparatus, the radio frequency coil apparatus is secured to the magnetic resonance imaging system substantially within an imaging region of the magnetic resonance imaging system.
1. A helmet configured to accommodate a patient's head during magnetic resonance imaging, the helmet comprising:
at least one radio frequency transmit and/or receive coil; and
at least one first releasable securing mechanism configured to engage with a member attached to a magnetic resonance imaging system at a location such that, when the at least one first releasable securing mechanism engages with the member, the helmet is positioned within an imaging region of the magnetic resonance imaging system.
2. The helmet of claim 1 , wherein the at one first releasable securing mechanism comprises:
a receptacle dimensioned to accommodate the member; and
a retention portion configured to resist movement of the member once the member has been positioned within the receptacle.
3. The helmet of claim 2 , wherein the retention portion comprises a first arm portion and a second arm portion, each forming at least a portion of the receptacle, wherein the first arm portion comprises a first protrusion and the second arm portion comprises a second protrusion, and wherein the first protrusion and the second protrusion are configured to impede the member from entering and exiting the receptacle, such that force on the first protrusion and the second protrusion is needed to allow the member to enter and exit the receptacle.
4. The helmet of claim 3 , wherein the first protrusion and the second protrusion are configured such that a first force required to allow the member to enter the receptacle is less than a second force required to allow the member to exit the receptacle.
5. The helmet of claim 3 , wherein the member comprises a first portion having a first diameter and second portion having second diameter less than the first diameter, and wherein the first arm portion and the second arm portion are configured to position under the first portion and to grip the second portion when the retention portion is engaged with the member.
6. The helmet of claim 1 , wherein the first releasable securing mechanism allows rotation of the helmet about the member.
7. The helmet of claim 6 , further comprising a second securing mechanism configured to prevent rotation of the helmet about the member when the second securing mechanism engages with the member.
8. The helmet of claim 7 , wherein the member comprises at least one recess, and wherein the second securing mechanism is configured to fit within the at least one recess to prevent rotation of the helmet about the member when the second securing mechanism engages with the at least one recess.
9. The helmet of claim 1 , wherein at least a portion of the helmet comprises see-through material so that the patient's head is visible through the helmet when the patient's head is positioned within the helmet.
10. The helmet of claim 9 , wherein the at least a portion of the helmet comprises transparent material.
11. The helmet of claim 9 , wherein the at least a portion of the helmet comprises semitransparent material.
12. A helmet configured to accommodate a patient's head during magnetic resonance imaging, the helmet comprising:
at least one radio frequency transmit and/or receive coil;
at least one first releasable securing mechanism configured to engage with a member of a magnetic resonance imaging system such that, when the at least one first releasable securing mechanism engages with the member, the at least one first releasable securing mechanism resists translation of the helmet relative to the member, but permits rotation about the member; and
at least one second securing mechanism configured to, when engaged with a cooperating portion of the member, prevent rotation of the helmet about the member.
13. The helmet of claim 12 , wherein the cooperating portion of the member comprises at least one recess and wherein the second securing mechanism is configured to fit within the at least one recess to prevent rotation of the helmet about the member when the second securing mechanism engages with the at least one recess.
14. The helmet of claim 13 , wherein the at least one second securing mechanism comprises a pin and the at least one recess comprises at least one notch configured to accommodate the pin.
15. The helmet of claim 12 , wherein the at one first releasable securing mechanism comprises:
a receptacle dimensioned to accommodate the member; and
a retention portion configured to resist movement of the member once the member has been positioned within the receptacle.
16. The helmet of claim 15 , wherein the retention portion comprises a first arm portion and a second arm portion, each forming at least a portion of the receptacle, wherein the first arm portion comprises a first protrusion and the second arm portion comprises a second protrusion, and wherein the first protrusion and the second protrusion are configured to impede the member from entering and exiting the receptacle, such that force on the first protrusion and the second protrusion is needed to allow the member to enter and exit the receptacle.
17. The helmet of claim 16 , wherein the first protrusion and the second protrusion are configured such that a first force required to allow the member to enter the receptacle is less than a second force required to allow the member to exit the receptacle.
18. The helmet of claim 16 , wherein the member comprises a first portion having a first diameter and second portion having second diameter less than the first diameter, and wherein the first arm portion and the second arm portion are configured to position under the first portion and to grip the second portion when the retention portion is engaged with the member.
19. The helmet of claim 12 , wherein the releasable securing mechanism allows rotation of the helmet about the member.
20. The helmet of claim 12 , wherein at least a portion of the helmet comprises see-through material so that the patient's head is visible through the helmet when the patient's head is positioned within the helmet.
21. The helmet of claim 20 , wherein the at least a portion of the helmet comprises transparent material.
22. The helmet of claim 20 , wherein the at least a portion of the helmet comprises semitransparent material.