Charged particle cancer therapy patient positioning method and apparatus
View Patent ↗The invention comprises a patient positioning method and apparatus used in conjunction with multi-axis charged particle or proton beam radiation therapy of cancerous tumors. The patient positioning system is used to translate the patient and/or rotate the patient into a zone where the proton beam can scan the tumor using a targeting system. The patient positioning system is optionally used in conjunction with systems used to constrain movement of the patient, such as semi-vertical, sitting, or laying positioning systems.
1. An apparatus for positioning a patient for irradiation of a tumor with charged particles extracted from a synchrotron, comprising:
a lower support unit;
at least one patient positioning device, said lower support unit supporting said patient positioning device;
means for rotating said lower support unit about an about vertical axis to a plurality of rotation positions;
an upper support unit mechanically connected to said lower support unit, said means for rotating rotating said lower support unit in synchronization with said upper support unit,
a first thermal resistor held by said upper support unit, said first thermal resistor configured in an exhalation path of the patient;
a second thermal resistor configured to sense environmental temperature out of the exhalation path; and
a controller using at least one reading from said first thermal resistor and said second thermal resistor to determine a respiration cycle of the patient,
wherein said plurality of rotation positions comprises at least five computer controlled rotation positions in a period of less than two minutes during irradiation of the tumor by the charged particles, said synchrotron configured to deliver the charged particles along an about horizontal axis over a portion of said lower support unit, and
wherein said controller controls delivery of the charged particles from said synchrotron in phase with said respiration cycle.
2. The apparatus of claim 1 , further comprising motors configured to adjust rotation position of both said lower support unit and vertical position of said lower support unit during delivery of the charged particles from said synchrotron.
3. The apparatus of claim 1 , further comprising:
a motor for adjusting distance between said lower support unit and an upper support unit.
4. The apparatus of claim 1 , further comprising:
means for vertically adjusting said lower support unit, wherein said means for vertically adjusting adjusts the tumor of the patient to overlap the charged particles extracted from said synchrotron.
5. The apparatus of claim 1 , said patient positioning device further comprising:
a semi-upright patient support surface, said semi-upright patient support surface reclined from said about vertical axis by less than about sixty-five degrees, said semi-upright support surface configured to constrain movement of the patient during delivery of the charged particles.
6. The apparatus of claim 1 , said apparatus further comprising control of all of:
an x-axis position of the charged particles;
a y-axis position of the charged particles;
energy of the charged particles; and
intensity of the charged particles, wherein said intensity comprises control through use of a feedback control using a current generated by the charged particles transmitting through a foil in an extraction process of the charged particles at said energy.
7. An apparatus for positioning a patient for irradiation of a tumor with charged particles extracted from a synchrotron, comprising:
a lower support unit;
at least one patient positioning device, said lower support unit supporting said patient positioning device;
means for rotating said lower support unit about an about vertical axis to a plurality of rotation positions; and
independent control of all of:
a vertical position of said lower support unit;
a rotation position of said lower support unit;
energy of the charged particles; and
intensity of the charged particles, wherein delivery of the charged particles comprises delivery at a repeating period, said period configured at a periodic time period of the patient's respiration cycle and in coordination with rotation of the patient on said rotatable platform during said plurality of rotation positions,
wherein said plurality of rotation positions comprises at least five computer controlled rotation positions in a period of less than two minutes during irradiation of the tumor by the charged particles, said synchrotron configured to deliver the charged particles along an about horizontal axis over a portion of said lower support unit.