Simultaneous multi-axes imaging apparatus and method of use thereof
View Patent ↗The invention comprises a method and apparatus for imaging a tumor with X-rays while, simultaneously or alternatingly, treating or imaging the tumor with positively charged particles. An X-ray imaging system, such as one or two sets of a cone beam X-ray source coupled to an X-ray detector, is rotatable about a first axis and a patient. The X-ray imaging system is positioned off axis a path of charged particles delivered through an exit port of a nozzle system from a synchrotron and does not block a path of the positively charged particles from the exit nozzle to the patient or an imaging path from the patient to a scintillation detector. Fiducial indicators are used to confirm an unobstructed path of the positively charged particles in a treatment room comprising many movable elements, such as the X-ray imaging system and a patient positioning system/couch.
1. A method for imaging a tumor of a patient using positively charged particles and X-rays, comprising the steps of:
rotating elements of an X-ray imaging system, configured to deliver the X-rays, around both a first rotation axis and the patient;
imaging the patient using the X-rays from said X-ray imaging system;
passing the positively charged particles through an exit port of a nozzle system, said nozzle system connected to a synchrotron via a first beam transport line, the positively charged particles passing into the patient from the exit port along a z-axis and at least one of: (1) treating the tumor with the positively charged particles and (2) imaging the patient with residual charged particles comprising the positively charged particles after transmitting through the patient;
providing both: (1) a first cone beam X-ray source and (2) a second cone beam X-ray source, of said X-ray imaging system, on a first side of the patient, said first cone beam X-ray source and said second cone-beam X-ray source separated by at least twenty centimeters; and
detecting X-rays from both said first cone beam X-ray source and said second cone beam X-ray source using at least one two-dimensional X-ray detector, of said X-ray imaging system, on an opposite side of the patient from said first cone beam X-ray source;
moving said exit port along an arc along an x-axis perpendicular to the z-axis, the z-axis maintaining a path from the exit port to the patient during said step of moving; and
rotating said source end of said X-ray imaging system and said detector end of said X-ray imaging system about the x-axis to maintain the z-axis as the first rotation axis of said X-ray imaging system; and
while repeating said steps of: (1) moving said exit port along said arc and (2) said step of rotating,
collecting a first set of images of the patient using the positively charged particles; and
collecting a second set of images of the patient using the X-rays, the first rotation axis comprising the z-axis.
2. The method of claim 1 , further comprising the step of:
simultaneously performing both: said step of treating the tumor using the positively charged particles and said step of imaging the patient using the X-rays,
wherein a mean treatment beam axis of the positively charged particles and a mean X-ray beam axis of X-rays from said first cone beam X-ray source form an angle of greater than twenty degrees and less than seventy degrees.
3. The method of claim 1 , further comprising the step of:
alternatingly and without movement of said X-ray imaging system relative to said exit port, performing said step of treating the tumor using the positively charged particles and said step of imaging the patient using the X-rays,
wherein a mean treatment beam axis of the positively charged particles and a mean X-ray beam axis of X-rays from said first cone beam X-ray source form an angle of greater than twenty degrees and less than seventy degrees.
4. The method of claim 3 , further comprising the step of:
rotating both said X-ray imaging system and said nozzle system about the patient to maintain the angle.
5. The method of claim 4 , further comprising the step of:
determining relative positions of said X-ray imaging system and said nozzle system using at least one fiducial detector detecting photons from a least one fiducial marker; and
using said relative positions, a controller generating a clear path confirmation signal, said clear path confirmation signal indicative of a path of the positively charged particles to the patient not passing through an obstructing physical element of said X-ray imaging system.
6. The method of claim 5 , said at least one fiducial marker affixed to a support element of said first cone beam X-ray source.
7. The method of claim 5 , said at least one fiducial marker affixed to a support element of said at least one two-dimensional X-ray detector.
8. The method of claim 3 , further comprising the steps of:
disconnecting said nozzle system from said first beam transport line;
moving said nozzle system; and
after said step of moving, connecting said nozzle system to a second beamline to direct the positively charged particles toward the patient at a different relative angle.