Treatment planning system for radiopharmaceuticals

Patent metadata

Field	Value
Publication number	US-10007961-B2
Application number	US-55632309-A
Country	US
Kind code	B2
Filing date	Sep 9, 2009
Priority date	Sep 9, 2009
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A treatment schedule for radiopharmaceuticals is developed by collecting a volumetric history of tissue uptake in identified volumes of interest using emitted-radiation scans and relating this data to a treatment-radiopharmaceutical to develop a quantitatively accurate radiation treatment schedule of delivery amounts and delivery times of the treatment-radiopharmaceutical. This data may also be used to model biological effective dose and to prepare augmenting external radiation beam treatment schedules.

First claim

We claim:

1. A system for planning a treatment schedule for a treatment-radiopharmaceutical, the system comprising:
a radiation imaging machine adapted to scan a patient over a volume to measure emitted radiation;
an electronic computer communicating with the radiation imaging machine and executing a stored program held in non-transitory computer readable medium to:
(1) receive a three-dimensional data set from the radiation imaging machine indicating a history of tissue uptake of an imaging-radiopharmaceutical in at least one volume of interest;
(2) deduce an active time of the imaging-radiopharmaceutical in the volume of interest, the active time in the form of a measured time activity curve providing radiation dose rate as a function of time over a treatment period for the at least one volume of interest; and
(3) prepare a treatment schedule for a treatment-radiopharmaceutical different from the imaging-pharmaceutical, based on the active time of the imaging-radiopharmaceutical, the treatment schedule providing a schedule of multiple delivery amounts and delivery times for the treatment-radiopharmaceutical, the treatment schedule setting the multiple delivery amounts and delivery times according to a combining of multiple overlapping values of multiple time activity curves spanning the treatment schedule, the multiple time activity curves each based on the measured time activity curve, each of the multiple time activity curves referenced to one of the delivery amounts and delivery times, the delivery amounts and delivery times constrained by a requirement that an overlapping radiation dose rate from a combination of the multiple time activity curves referenced to the delivery amounts and delivery times remains above a desired radiation dose rate necessary to kill tumor cells based on the active time of the treatment-radiopharmaceutical deduced from the active time of the imaging radiopharmaceutical.

2. The system of claim 1 wherein the program receives a desired treatment radiation dose-rate and the treatment schedule determines radiation dose and delivery time to provide the desired treatment radiation dose-rate in the volume of interest.

3. The system of claim 2 wherein the program deduces an active time of the imaging-radiopharmaceutical in at least two volumes of interest and wherein the desired treatment radiation dose-rate is received for a first volume of interest and the program further receives a toxicity limit for a second volume of interest and wherein the program determines radiation dose and delivery time to maximize a time period when the radiation dose-rate in the first volume of interest is no less than the desired treatment radiation dose-rate under a condition that the radiation dose-rate in the second volume of interest be no greater than the toxicity limit.

4. The system of claim 3 wherein the program provides an augmenting radiation dose map for external-beam radiotherapy to augment a radiation dose in the first volume of interest when a desired treatment radiation dose-rate cannot be achieved under the condition that the radiation dose-rate in the second volume of interest be no greater than the toxicity limit.

5. The system of claim 3 further including a library of toxicity limits for organs and wherein the program accepts as inputs volumes of interest and organ names for the volumes of interest to automatically deduce toxicity limits for the input volumes of interest.

6. The system of claim 2 wherein the program further receives a desired radiation dose map of the first volume of interest and determines a radiation dose map of the first volume of interest from the three-dimensional data set to compute a difference radiation dose therebetween for augmenting external radiation beam treatment.

7. The system of claim 6 wherein the program further computes an achievable external radiation beam radiation dose and iteratively corrects the difference radiation dose and the treatment schedule to provide a desired radiation dose to the first volume of interest.

8. The system of claim 2 wherein the imaging-radiopharmaceutical is different from the treatment-radiopharmaceutical and including the step of correcting the active time for the imaging-radiopharmaceutical to reflect an active time of the treatment-radiopharmaceutical.

9. The system of claim 8 wherein the step of correcting changes absolute uptake within the first and second volumes of interest while preserving relative uptake between the first and second volumes.

10. The system of claim 1 wherein the program further outputs an image showing an expected radiation dose to the first volume of interest.

11. The system of claim 1 wherein the program determines the delivery amounts and delivery time by using a linear superposition of the active time of the imaging-radiopharmaceutical.

12. A method for planning a treatment schedule for a treatment-radiopharmaceutical comprising the steps of:
(a) collecting three-dimensional data on a radiation imaging machine related to emitted radiation from an imaging radiopharmaceutical;
(b) collecting from the three-dimensional data collected in step (a) on at least one electronic computer executing a stored program stored in non-transitory computer readable medium, a three-dimensional data set indicating a history of tissue uptake of the imaging-radiopharmaceutical in at least two volumes of interest;
(c) determining on at least one electronic computer executing a stored program stored in non-transitory computer readable medium, uptake of the imaging-radiopharmaceutical in the two volume of interest over a period of time, the determined uptakes being in the form of measured time activity curves providing radiation dose rates as a function of time over a treatment period for the at least two volumes of interest; and
(d) preparing on at least one electronic computer executing a stored program stored in non-transitory computer readable medium, a treatment schedule for a treatment-radiopharmaceutical different from the imaging-pharmaceutical, the schedule providing multiple delivery amounts and delivery times based on a combining of multiple overlapping values of multiple time activity curves spanning the treatment schedule, the multiple time activity curves each based on one of the measured time activity curves, each of the multiple time activity curves referenced to different of the delivery amounts and delivery times; the delivery amounts and delivery times of the treatment schedule selected to maximize an uptake in the first volume of interest above a desired radiation dose rate necessary to kill tumor cells from a combination of overlapping radiation dose rates of the multiple delivery amounts subject to controlling uptake in the second volume of interest during the schedule below a toxicity limit.

13. The method of claim 12 wherein the imaging-radiopharmaceutical is identical to the treatment-radiopharmaceutical with an exception of a radioactive isotope.

14. The method of claim 12 wherein the imaging and treatment-radiopharmaceutical are different radioisotopes attached to NM404.

15. The method of claim 12 wherein the three-dimensional data set is collected by an imaging machine selected from the group consisting of: a SPECT imager and a PET imager.

16. The method of claim 12 further including the step of calculating an augmenting radiation dose map for external-beam radiotherapy to augment a radiation dose in the first volume of interest when ,a desired treatment radiation dose-rate cannot be achieved under a condition that the radiation dose-rate in the second volume of interest be

Assignees

• Grudzinski Joseph J
• Jeraj Robert
• Tome Wolfgang A
• Weichert Jamey P
• Wisconsin Alumni Res Found

Inventors

• Grudzinski Joseph J
• Jeraj Robert
• Tome Wolfgang A
• Weichert Jamey P

Classifications

• G06Q50/22 Primary

  Social work or social welfare, e.g. community support activities or counselling services · CPC title

• G06F19/00

  Physics · mapped topic

• G16Z99/00

  Subject matter not provided for in other main groups of this subclass · CPC title

• G16H20/40 Primary

  relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture · CPC title