Rotatable magnet for proton therapy
AssigneeKoninklijke Philips N.V.
InventorsPeter Forthmann, Philip Alexander Jonas, Johannes Adrianus Overweg
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Abstract
The following relates generally to use of magnetic resonance (MR) imaging as guidance in radiation therapy, and more specifically to use of MR imaging as guidance in proton therapy. In some embodiments, a cryogenic dewar is provided with multiple channels allowing a proton beam from a proton beam source to pass through. The proton beam may first be aligned with a first channel, and the dewar may then be rotated along with the proton source. The dewar may then be rotated to align a second channel with the proton beam.
Claims19
A horizontal bore magnet having a cylinder axis, the horizontal bore magnet comprising:
- a cryogenic dewar having an outer cylindrical wall and an inner cylindrical wall arranged coaxially respective to the cylinder axis and a cryogenic fluid plenum defined between the outer and inner cylindrical walls, the inner cylindrical wall surrounding a magnet bore;
- annular magnet windings disposed in the cryogenic fluid plenum;
- and
- at least one radial channel having an outer end sealed with the outer cylindrical wall of the cryogenic dewar and an inner end sealed with the inner cylindrical wall of the cryogenic dewar, the at least one channel passing radially through the dewar
- wherein the at least one radial channel is curved to account for a qv×B force deflecting a proton beam passing through the channel.
A magnetic resonance (MR) imaging system, comprising:
- a horizontal bore magnet including a cryogenic dewar having multiple channels passing through the dewar towards a cylinder axis of the cryogenic dewar
- a mechanical rotation system configured to rotate the dewar.
A method of magnetic resonance (MR) imaging performed in conjunction with an MR device including magnet windings generating a magnetic field for MR imaging and a cryogenic dewar containing the magnet windings, the cryogenic dewar including at least one channel passing radially through the cryogenic dewar, the method comprising:
- during a first rotation, rotating, in a first direction, the cryogenic dewar while a proton beam passes through a first channel of the cryogenic dewar towards a center axis of the dewar.
Dependencies are inferred from the claim text.