# US 2017/0281979 A1 · Radiation Treatment Platform and Method Using a Portal Imaging Device to Automatically Control Therapy Administration > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0281979 A1 - Document ID: US20170281979A1 - Status: Published application - Kind: A1 - Application number: 15/086,530 - Filed: 2016-03-31 - Published: 2017-10-05 - Earliest claimed: 2016-03-31 - Assignees: Varian Medical Systems International AG - Applicants: Varian Medical Systems International AG - Inventors: Risto Ahonen; Esa Kuusela; Tuomas E. Torsti - Web page: https://patentgrep.com/patent/US20170281979A1 ## CPC - A61N 5/1071: {for verifying the dose delivered by the treatment plan} - A61N 5/1048: {Monitoring, verifying, controlling systems and methods} - A61N 5/1067: {in real time, i.e. during treatment} - A61N 5/1081: {Rotating beam systems with a specific mechanical construction, e.g. gantries} - A61N 2005/1054: {using a portal imaging system} - A61N 2005/1072: {taking into account movement of the target} - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) ## Abstract A portal imaging device is used to determine an amount of radiation that is delivered to at least one point while administering a radiation treatment therapy to a patient. Upon detecting that the amount of radiation that is delivered to that at least one point exceeds a predetermined amount of radiation (for example, a planned amount of radiation per the radiation treatment plan), administration of radiation treatment therapy to the patient can be automatically halted. ## Claims ### Claim 1 A method comprising: while administering a radiation treatment therapy to a patient using a movable radiation source in accordance with a radiation treatment plan, using a portal imaging device to determine an amount of radiation that is delivered to at least one point; detecting when the amount of radiation that is delivered to the at least one point exceeds a predetermined amount of radiation; when the amount of radiation that is delivered to the at least one point exceeds the predetermined amount of radiation, automatically halting the administering of the radiation treatment therapy to the patient. ### Claim 2 (depends on 1) The method of claim 1 wherein the predetermined amount of radiation comprises a planned amount of radiation per the radiation treatment plan. ### Claim 3 (depends on 1) The method of claim 1 wherein using the portal imaging device to determine an amount of radiation that is delivered to at least one point comprises using the portal imaging device to determine an amount of radiation that is delivered to each of a plurality of points. ### Claim 4 (depends on 3) The method of claim 3 wherein detecting when the amount of radiation that is delivered to the at least one point exceeds a predetermined amount of radiation comprises detecting when the amount of radiation that is delivered to any of the plurality of points exceeds a predetermined amount of radiation for any of the plurality of points. ### Claim 5 (depends on 3) The method of claim 3 wherein detecting when the amount of radiation that is delivered to the at least one point exceeds a predetermined amount of radiation comprises detecting when an aggregate amount of radiation that is delivered to at least some of the plurality of points exceeds the predetermined amount of radiation. ### Claim 6 (depends on 3) The method of claim 3 wherein using the portal imaging device to determine an amount of radiation that is delivered to each of a plurality of points comprises continuously using the portal imaging device to determine the amount of radiation that is delivered to each of a plurality of points during the radiation treatment therapy. ### Claim 7 (depends on 1) The method of claim 1 wherein the at least one point comprises a point on a virtual cylinder that is disposed about but that does not include the patient. ### Claim 8 (depends on 2) The method of claim 2 wherein detecting when the amount of radiation that is delivered to the at least one point exceeds a predetermined amount of radiation comprises detecting when an aggregated amount of radiation that is delivered to the at least one point while the movable radiation source is at different locations exceeds the predetermined amount of radiation. ### Claim 9 (depends on 8) The method of claim 8 wherein the predetermined amount of radiation does not constitute a calculated dose corresponding to a volume in the patient. ### Claim 10 (depends on 9) The method of claim 9 wherein the predetermined amount of radiation comprises a calculated amount for the point on the virtual cylinder. ### Claim 11 An apparatus comprising: a movable radiation source; a drive mechanism configured to selectively move the movable radiation source; a portal imaging device configured to move in conjunction with the movable radiation source; a control circuit operably coupled to the portal imaging device and to the movable radiation source and configured to: while administering a radiation treatment therapy to a patient using the movable radiation source in accordance with a radiation treatment plan, using the portal imaging device to determine an amount of radiation that is delivered to at least one point; detect when the amount of radiation that is delivered to the at least one point exceeds a predetermined amount of radiation; when the amount of radiation that is delivered to the at least one point exceeds the predetermined amount of radiation, automatically halt the drive mechanism. ### Claim 12 (depends on 11) The apparatus of claim 11 wherein the predetermined amount of radiation comprises a planned amount of radiation per the radiation treatment plan. ### Claim 13 (depends on 11) The apparatus of claim 11 wherein the control circuit is configured to use the portal imaging device to determine an amount of radiation that is delivered to at least one point by using the portal imaging device to determine an amount of radiation that is delivered to each of a plurality of points. ### Claim 14 (depends on 13) The apparatus of claim 13 wherein the control circuit is configured to detect when the amount of radiation that is delivered to the at least one point exceeds a predetermined amount of radiation by detecting when the amount of radiation that is delivered to any of the plurality of points exceeds a predetermined amount of radiation for any of the plurality of points. ### Claim 15 (depends on 13) The apparatus of claim 13 wherein the control circuit is configured to detect when the amount of radiation that is delivered to the at least one point exceeds a predetermined amount of radiation by detecting when an aggregate amount of radiation that is delivered to at least some of the plurality of points exceeds the predetermined amount of radiation. ### Claim 16 (depends on 13) The apparatus of claim 13 wherein the control circuit is configured to use the portal imaging device to determine an amount of radiation that is delivered to each of a plurality of points by continuously using the portal imaging device to determine the amount of radiation that is delivered to each of a plurality of points during the radiation treatment therapy. ### Claim 17 (depends on 11) The apparatus of claim 11 wherein the at least one point comprises a point on a virtual cylinder that is disposed about but that does not include the patient. ### Claim 18 (depends on 12) The apparatus of claim 12 wherein the control circuit is configured to detect when the amount of radiation that is delivered to the at least one point exceeds a predetermined amount of radiation by detecting when an aggregated amount of radiation that is delivered to the at least one point while the movable radiation source is at different locations exceeds the predetermined amount of radiation. ### Claim 19 (depends on 18) The apparatus of claim 18 wherein the predetermined amount of radiation does not constitute a calculated dose corresponding to a volume in the patient. ### Claim 20 (depends on 19) The apparatus of claim 19 wherein the predetermined amount of radiation comprises a calculated amount for the point on the virtual cylinder.