Megavoltage radiation therapy machine combined to diagnostic imaging devices for cost efficient conventional and 3D conformal radiation therapy with on-line Isodose port and diagnostic radiology

• US 5,851,182 A
• Filed: 09/11/1996
• Issued: 12/22/1998
• Est. Priority Date: 09/11/1996
• Status: Expired due to Fees

• Current Assignee: Velayudhan Sahadevan
• Original Assignee: Velayudhan Sahadevan
• Inventors: Sahadevan, Velayudhan
• Primary Examiner(s): Lateef, Marvin M.
• Assistant Examiner(s): Mercader, Eleni Mantis
• Application Number:
  US08/712,623
• Time in Patent Office: 832 Days
• Field of Search: 128/653.1, 128/653.2, 364/413.13, 378/62, 378/63, 378/64, 378/65, 600/407, 600/410
• US Class Current: 600/407
• CPC Class Codes: A61N 2005/1063 maintaining the position when the patient is moved from an imaging to a therapy system
• CPC Class Codes: A61N 2005/1094 Shielding, protecting against radiation
• CPC Class Codes: A61N 5/1049 for verifying the position of the patient with respect to the radiation beam

Abstract

A patient setup and treatment verification system for radiation therapy having diagnostic imaging devices connected to a room containing a megavoltage radiation therapy machine. The diagnostic rooms and the megavoltage therapy room are connected to each other by openings in the shared secondary wall of the accelerator or through an anteroom to the megavoltage therapy room. Daily patient setup for routine and three-dimensional conformal radiation therapy and on-line treatment port verification with superimposed isodose are done with the patient on a diagnostic-imaging table. The patients are transferred from the diagnostic table to the treatment table without changing the verified treatment position. Sliding or rotating shield or maze walled anteroom are used for radiation protection. A patient setup with multiple diagnostic devices in separate chambers allows rapid turnover of patients in the megavoltage treatment room with patients spending much less time in the treatment room. When the diagnostic device is not in use with the megavoltage therapy machine for radiation therapy of patients in a radiation oncology department, it can be used as a routine diagnostic device for a diagnostic radiology department.

Claims

1. An improved patient handling system for use with a radiation therapy device and medical imaging device, comprising:

a first chamber having a radiation therapy device;

a second chamber having a medical imaging device; and

a first wall dividing said first chamber and said second chamber and having means defining a hole in said first wall for providing communication between said first chamber and said second chamber;

said first wall further having radiation shielding means including an open position allowing communication between said first and second chambers and a closed position for selectively covering said first wall hole defining means to seal said second chamber from radiation from the radiation therapy device in said first chamber;

a cradle located on the medical imaging device for receiving a table top insert and having means defining a groove on said cradle;

a cradle located on the radiation therapy device for receiving said table top insert and having means defining a groove on said cradle;

said table top insert having a patient securing means for securing a patient in a fixed position on said table top insert and having a lower surface for securing rollers to said lower surface and wherein said rollers are sized to fit within said groove of the medical imaging device and said groove of the radiation therapy device;

said means defining said hole in said first wall being sized and positioned such that said table can be rolled on said rollers from said medical imaging device cradle to said radiation therapy device cradle without changing the position of the patient.

2. An improved patient handling system according to claim 1 further wherein

said radiation shielding means includes a sliding shield door having a hollow core for receiving a liquid shielding material;

said radiation shielding means further including an upper reserve tank in said wall for receiving said liquid shielding material, a lower reserve tank in said wall for receiving said liquid shielding material, at least one pump for pumping said liquid shielding material from said lower reserve tank to said upper reserve tank, a valve in said sliding shield door for selectively allowing said liquid shield material to flow from said upper reserve tank to said hollow core, and an outlet valve for selectively allowing said liquid shield material to flow from said hollow core to said lower reserve tank.

3. An improved patient handling system according to claim 2 further wherein said radiation shielding means includes lead, concrete, and liquid metals.

4. An improved patient handling system according to claim 2 wherein said radiation shielding means includes a plurality of doors each having rollers;

and said first wall includes a concrete portion for slidingly receiving said rollers on said plurality of door rollers and driving means for driving said plurality of door rollers for sliding said plurality of radiation shielding doors.

5. An improved patient handling system according to claim 4 wherein said driving means includes a motor.

6. An improved patient handling system according to claim 4 wherein said plurality of radiation shielding doors have means defining a hollow core therein for receiving a liquid shielding material.

7. An improved patient handling system according to claim 6 wherein said liquid shielding material is a metal.

8. An improved patient handling system according to claim 6 further wherein said liquid metal is a Lipowitz metal.

9. An improved patient handling system according to claim 8 wherein said Lipowitz metal is substantially 70 degrees Celsius.

10. An improved patient handling system according to claim 1 further comprising:

a third chamber having a second medical imaging device and a second wall dividing said first chamber and said third chamber and having a second means defining a second hole in said second wall for providing communication between said first chamber and said third chamber;

a cradle located on the second medical imaging device for receiving a table top insert and having means defining a groove on the second medical imaging device cradle for receiving the table top insert rollers;

said second means defining said second hole in said second wall being sized and positioned such that said table can be rolled on said rollers from said second medical imaging device cradle to said radiation therapy device cradle without changing the position of the patient.

11. An improved patient handling system according to claim 10, wherein the medical imaging device includes a gantry having means defining an opening for receiving the patient and said table top insert on said medical imaging cradle in said opening;

said gantry further includes an entrance and an exit; and

wherein

said first wall is intermediate said medical imaging device gantry exit and the radiation therapy device.

12. An improved patient handling system according to claim 10 further wherein the radiation therapy device is selected from a Computed Tomography device, Magnetic Resonance Imaging device or a simulator combined with a Computed Tomography device.

13. An improved patient handling system according to claim 10 further wherein the radiation therapy device is selected from either a medical linear accelerator, a cobalt-60 machine, or a medical microtron.

14. The improved patient handling system according to claim 1, further comprising:

an antechamber adjacent to said first chamber via a door opening;

a means for communicating between said antechamber and said first chamber, wherein said means for communicating reduces shielding requirements between said first chamber and said antechamber; and

a plurality of second chambers adjacent to said antechamber such that said first chamber communicates with said plurality of second chambers via said antechamber and said means for communicating;

whereby a patient is transported on said table top insert from one said second chamber to said first chamber on top of an extension table via said antechamber with minimal change in position of the patient on said table top insert.

15. The improved patient handling system according to claim 14, wherein said means for communicating between said antechamber and said first chamber is a plurality of walls in said first chamber creating a maze configuration, thereby reducing scattered radiation reaching said maze configuration.

16. The improved patient handling system according to claim 15, wherein said plurality of walls comprises:

a short maze wall; and

a long maze wall having a hole opening for a patient'"'"'s transport, said hole opening aligned with said door opening.

17. The improved patient handling system according to claim 14, further comprising

an operating room;

a means for connecting said operating room to one said second chamber; and

a means for connecting said operating room to said antechamber.

18. The improved patient handling system according to claim 17, wherein said antechamber reduces scattered radiation from the radiation therapy device in said first chamber that reaches said operating room and said second chambers.

19. The improved patient handling system according to claim 17, wherein said means for communicating between said antechamber and said first chamber is a plurality of walls in said first chamber creating a maze configuration, thereby reducing scattered radiation from the radiation therapy device in said first chamber that reaches said antechamber, said second chambers and said operating room.

20. The improved patient handling system according to claim 14, further comprising a method of transferring a patient secured to a table top insert on said cradle of the medical imaging device from one said second chamber to said first chamber via said antechamber, wherein said method of transferring the patient comprises the steps of:

a. advancing said table top insert on said rollers of said table top insert within said grooves of the medical imaging device such that said table top insert extends over the medical imaging device'"'"'s back exit and into said cradle of said extension table;

b. advancing completely said table top insert onto said extension table;

c. advancing said extension table from said second chamber to said antechamber through a door opening;

d. advancing said extension table from said antechamber to said first chamber through said door opening;

e. advancing said table top insert on said rollers of said table top insert within said grooves of said extension table such that said table top insert extends over an end of said extension table and into said cradle of the radiation therapy device; and

f. advancing completely said table top insert onto the radiation therapy device such that a treatment site of the patient is under the radiation therapy device'"'"'s treatment head.

21. The improved patient handling system according to claim 14, further comprising:

one or more rails on the floor connecting the radiation therapy device in said first chamber, said antechamber, and the medical imaging devices in said second chambers; and

an extension table with a cradle having means defining a plurality of grooves on said extension table wherein said grooves of said extension table are sized to receive said rollers of said table top insert, thereby engaging and guiding said table top insert, and having a means for traveling along said rails;

wherein the patient is transferred between said first chamber, said antechamber, and said second chambers on said table top insert on said extension table by traveling along said rails.

22. The improved patient handling system according to claim 1, further comprising an extension table having means defining a plurality of grooves on said extension table wherein said grooves of said extension table are sized to receive said rollers of said table top insert, thereby engaging and guiding said table top insert.

23. The improved patient handling system according to claim 22, wherein said cradle of the radiation therapy device, said cradle of the medical imagery device, and said cradle of said extension table further comprise:

a means for latching together the radiation therapy device, the medical imaging device and said extension table;

a male notch; and

a female notch;

whereby said male notch and said female notch are aligned when a radiation therapy device, medical imagery device or an extension table are latched together, thereby facilitating the transport of a patient on said table top insert.

24. The improved patient handling system according to claim 22, further comprising a method of transferring a patient secured to a table top insert on said cradle of the medical imaging device from said second chamber to said first chamber through a door opening in said first wall, wherein said method of transferring the patient comprises the steps of:

a. advancing said table top insert on said rollers of said table top insert within said grooves of the medical imaging device such that said table top insert extends over an end of the medical imaging device and onto said extension table;

b. advancing completely said table top insert onto said extension table;

c. advancing said extension table from said second chamber to said first chamber through the door opening;

d. advancing said table top insert on said rollers of said table top insert within said grooves of said extension table such that said table top insert extends over an end of said extension table and into said cradle of a table of the radiation therapy device; and

e. advancing completely said table top insert onto the table of the radiation therapy device such that a treatment site of the patient is under the radiation therapy device'"'"'s treatment head.

25. The improved patient handling system according to claim 14, further comprising:

a third chamber having a second radiation therapy device; and

a means for communicating between said third chamber and said antechamber, wherein said means for communicating reduces shielding requirements between said third chamber and said antechamber.

26. The improved patient handling system according to claim 25, wherein said second radiation therapy device has a special collimator for three dimensional conformal radiation therapy or for radiosurgeries.

27. The improved patient handling system according to claim 1, further comprising:

a third chamber having a second radiation therapy device equipped with a special purpose collimator for three dimensional conformal radiation therapy or for radiosurgeries;

a second wall dividing said third chamber and said second chamber and having a means defining a hole in said second wall for providing communication between said third chamber and said second chamber; and

said second wall further having radiation shielding means including an open position allowing communication between said third chamber and said second chamber and a closed position for selectively covering said hole in said second wall defining means to seal said second chamber from radiation from the second radiation therapy device in said third chamber;

wherein, in said second chamber, said medical imagery device'"'"'s back exit faces said third chamber.

28. The improved patient handling system according to claim 1, wherein said first chamber is hexagonal in shape and said radiation therapy device is placed away from its primary beam'"'"'s direction to take advantage of the distance traveled by scattered radiation;

and

a plurality of second chambers adjacent to said first chamber wherein each said second chamber has a first wall dividing said first chamber and said second chamber and a means defining a hole in said first wall and a radiation shielding means.

29. The improved patient handling system according to claim 14, wherein said first chamber, a heavily shielded room, and said plurality of second chambers are placed in a hexagonal arrangement, wherein said antechamber provides a barrier between said first chamber and said plurality of second chambers, such that a patient is transported from one said second chamber to said first chamber with a minimal change in position on said table top insert.

30. The improved patient handling system according to claim 1, further comprising:

a third chamber having a medical imaging device and a second wall dividing said first chamber and said third chamber and having means defining a hole in said second wall for providing communication between said first chamber and said third chamber, wherein the medical imaging device in said third chamber is placed at ninety degrees to the radiation therapy device in said first chamber such that the medical imaging device'"'"'s front end faces the radiation therapy device, thereby allowing the placement of a treatment site of the patient under the radiation therapy device'"'"'s treatment head with rotation of the patient; and

a fourth chamber having a medical imaging device and a third wall dividing said first chamber and said fourth chamber and having means defining a hole in said third wall for providing communication between said first chamber and said fourth chamber, wherein the medical imaging device in said fourth chamber is placed at two hundred seventy degrees to the radiation therapy device in said first chamber such that the medical imaging device'"'"'s front end faces the radiation therapy device, thereby allowing placement of a treatment site of the patient under the radiation therapy device'"'"'s treatment head with rotation of the patient;

wherein the radiation therapy device is placed in said first chamber such that the radiation therapy device faces the back exit of the medical imaging device in said second chamber, thereby allowing placement of a treatment site of the patient under the radiation therapy device'"'"'s treatment head without rotation of the patient.

31. The improved patient handling system according to claim 1, further comprising a method of transferring a patient secured to a table top insert in said cradle of the medical imaging device from said second chamber to said first chamber through said hole in said first wall, wherein said method of transferring the patient comprises the steps of:

a. advancing said table top insert on said rollers of said table top insert within said grooves of the medical imaging device such that said table top insert extends over an end of the medical imaging device and into said hole in said first wall;

b. advancing said table top insert on said rollers of said table top insert through said hole in said first wall and into said cradle of the radiation therapy device such that said table top insert extends through said hole and onto an end of the radiation therapy device;

c. advancing completely said table top insert onto a table of the radiation therapy device; and

d. rotating the table of the radiation therapy device to bring a treatment site of the patient under the radiation therapy device'"'"'s treatment head.

32. The improved patient handling system according to claim 1, further comprising a method of treating a patient secured to a table top insert without positional errors when transferring the patient from a medical imaging device in said second chamber to a radiation therapy device in said first chamber, wherein said method of treating the patient comprises the steps of:

a. placing the patient in a treatment position on said table top insert, wherein said table top insert on which the patient is secured is in said cradle of the medical imaging device in said second chamber;

b. generating and marking one or more images of a treatment field on the patient in said treatment position using the medical imaging device;

c. transferring said table top insert from the medical imaging device to the radiation therapy device in said first chamber wherein the patient remains in said treatment position; and

d. treating the patient in said treatment position with the radiation therapy device.

33. The improved patient handling system according to claim 1, further comprising a method of treating a patient secured to a table top insert without positional errors when transferring the patient from a medical imaging device in said second chamber to a radiation therapy device in said first chamber, wherein said method of treating the patient comprises the steps of:

a. placing the patient in a treatment position on said table top insert, wherein said table top insert on which the patient is secured is in said cradle of the medical imaging device in said second chamber;

b. generating one or more images of a treatment field and marking said treatment field on the patient in said treatment position with the medical imaging device and a marker and generating one or more radiation isodose representations on said images with a treatment planning computer, wherein said images are on-line treatment portals with superimposed computer generated isodose to the true three dimensional visualized treatment region for radiation therapy.

c. transferring said table top insert from the medical imaging device to the radiation therapy device in said first chamber wherein the patient remains in said treatment position; and

d. treating the patient in said treatment position with the radiation therapy device by using conventional and three dimensional conformal radiation therapy, stereotactic radiosurgery and intraoperative radiation therapy.

34. The improved patient handling system according to claim 1, further comprising a method of treating a patient secured to a table top insert without positional errors when transferring the patient from a medical imaging device in said second chamber to a radiation therapy device in said first chamber, wherein said method of treating the patient comprises the steps of:

a. placing the patient in a treatment position on said table top insert, wherein said table top insert on which the patient is secured is in said cradle of the medical imaging device in said second chamber;

b. generating one or more images of a treatment field and its surrounding normal tissue and critical structures in the patient in said treatment position and marking said treatment field on the patient'"'"'s skin while the patient is in the treatment position with the medical imaging device and generating a radiation isodose with a treatment planning computer, resulting in said images being isodose superimposed port verification images;

c. transferring said table top insert from the medical imaging device to the radiation therapy device in said first chamber wherein the patient remains in said treatment position; and

d. treating the patient in said treatment position with the radiation therapy device, thereby maximizing a dose of radiation directed to a tumor in said treatment field and minimizing the dose of radiation directed to the normal tissue and critical structures surrounding the tumor.

35. The improved patient handling system according to claim 34, wherein generating said images with said treatment planning computer results in online medical imaging and improves quality radiation therapy and quality control.

36. The improved patient handling system according to claim 34, wherein generating said images with said treatment planning computer, resulting in online medical imaging, and using said port verification images improves quality radiation therapy and quality control.

37. The improved patient handling system according to claim 1, further comprising a method of treating a patient secured to a table top insert such that there are minimal positional errors when transferring the patient from a medical imaging device in said second chamber to a radiation therapy device in said first chamber, wherein said method of treating the patient comprises the steps of:

a. placing the patient in a treatment position on said table top insert, wherein said table top insert on which the patient is secured is in said cradle of the medical imaging device in said second chamber;

b. generating an image of a treatment site on the patient in said treatment position with the medical imaging device, wherein the medical imaging device is equipped with markers resulting in an image treatment field being marked on the patient'"'"'s skin and said image is superimposed with radiation isodose distribution to said treatment site and its surrounding normal tissue including the critical structures;

c. transferring said table top insert from the medical imaging device to the radiation therapy device in said first chamber wherein the patient remains in said treatment position; and

d. treating the patient in said treatment position with the radiation therapy device, thereby maximizing a dose of radiation directed to a tumor in said treatment field and minimizing the dose of radiation directed to the normal tissue and critical structures surrounding the treatment site.

38. The improved patient handling system according to claim 1, wherein the medical imaging device in said second chamber is used independent of the radiation therapy device in said first chamber such that the medical imaging device is used for routine diagnostic imaging purposes.

39. The improved patient handling system according to claim 1, wherein the radiation therapy device provides advanced radiation therapy such as three dimensional radiation therapy, radiosurgery, intraoperative radiation therapy and three dimensional display of brachytherapy implant source.

40. The improved patient handling system according to claim 1, wherein said radiation shielding means is a rotating cylindrical shielding door having a central opening, a hollow core filled with a radiation blocking material, and a means for rotating.

41. The improved patient handling system according to claim 40, wherein said means for rotating is a motor driven chain.

42. The improved patient handling system according to claim 40, wherein said means for rotating is a mechanical handle.

43. The improved patient handling system according to claim 40, wherein said radiation blocking material is lead.