# US 9,433,387 B2 · Patient positioning system and methods for diagnostic radiology and radiotherapy > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,433,387 B2 - Document ID: US9433387B2 - Status: Granted - Kind: B2 - Application number: 13/185,903 - Filed: 2011-07-19 - Published: 2012-02-23 - Granted: 2016-09-06 - Earliest claimed: 2008-11-18 - Assignees: Pyronia Medical Technologies, Inc. - Applicants: Peter Hyung-Kyun Ahn - Inventors: Peter Hyung-Kyun Ahn - Web page: https://patentgrep.com/patent/US9433387B2 ## CPC - A61B 6/04: Positioning of patients; Tiltable beds or the like - A61N 5/1049: {for verifying the position of the patient with respect to the radiation beam} - A61B 5/7285: {for synchronizing or triggering a physiological measurement or image acquisition with a physiological event or waveform, e.g. an ECG signal} - A61B 6/541: {involving acquisition triggered by a physiological signal} - A61B 2562/0247: Pressure sensors - A61B 2562/046: in a matrix array - A61N 5/1037: {taking into account the movement of the target, e.g. 4D-image based planning} - A61N 5/1064: {for adjusting radiation treatment in response to monitoring} - A61N 2005/1051: {using an active marker} - A61N 2005/1097: {Means for immobilizing the patient} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - 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 The system provides new ways to ensure that a patient is positioned correctly, e.g. identically with an original planning scan if the patient is to undergo radiotherapy. The system also detects if there is patient movement during a scan. It is an aspect of the present method to immobilize the patient based on a specific site of interest by using positioning sensors that record patient physical orientation based on measurements of patient weight distribution and pressure distribution among other features. ## Claims ### Claim 1 A method for positioning a patient on a patient table during a radiation therapy or diagnostics (RTD) session comprising: positioning at least a portion of a patient's anatomy relative to a patient immobilization device comprising at least one pressure sensor in a fixed position relative to said patient table; obtaining real-time patient position data from said at least one pressure sensor; monitoring patient position in real time with said patient position data to maintain said patient in a particular position for treatment or scanning prior to a RTD session, continuously during said RTD session, and/or in a subsequent RTD session. ### Claim 2 (depends on 1) The method of claim 1, wherein said monitoring said patient position in real-time further comprises recording said patient position data from a first RTD session in data storage medium and comparing said patient position data from said first RTD session with patient position data from said subsequent RTD session, and maintaining said particular position comprises positioning said patient's anatomy in said subsequent RTD session to be essentially in said particular position. ### Claim 3 (depends on 1) The method of claim 1, wherein maintaining said particular position comprises signaling a technician or a patient stabilizer to move said immobilization device to position said patient's anatomy in said particular position. ### Claim 4 (depends on 1) The method of claim 1, wherein said monitoring further comprises accounting for respiratory phase and delivering instructions to turn on or off a radiation therapy or diagnostic scanning unit, correlating to said respiratory phase or excursion, for selectively delivering radiation to or scanning a predetermined region of a patient's anatomy. ### Claim 5 (depends on 1) The method of claim 1, wherein said monitoring further comprises verifying the position of a patient's larynx and assessing swallowing status, for selectively delivering radiation to or scanning a predetermined region of a patient's anatomy. ### Claim 6 (depends on 1) The method of claim 1, further comprising delivering radiotherapy to tumors selected from the group consisting of anatomic areas including thoracic, abdominal, pelvic, skull, extremity, head and neck tumors. ### Claim 7 (depends on 1) The method of claim 1, wherein said patient immobilization device is integral to said patient table. ### Claim 8 (depends on 1) The method of claim 1, wherein said at least one pressure sensor is a plurality of pressure sensors. ### Claim 9 (depends on 1) The method of claim 1, wherein maintaining said patient in said particular position comprises moving said patient. ### Claim 10 (depends on 1) The method of claim 1, wherein said patient position data is generated from an external interrogator device interfaced with said at least one pressure sensor. ### Claim 11 (depends on 10) The method of claim 10, wherein said external interrogator signals a patient stabilizer to move said immobilization device to move said patient into said particular position. ### Claim 12 (depends on 1) The method of claim 1, wherein said RTD session is a radiation therapy session and said particular position is determined prior to said RTD session. ### Claim 13 (depends on 1) The method of claim 1, wherein said RTD session is a diagnostic or radiotherapy planning session and said subsequent treatment and/or diagnostic scanning position is determined during said RTD session. ### Claim 14 (depends on 10) The method of claim 10, wherein said patient position is monitored and the technician or external interrogator sends the patient a signal, whether verbal, visual or vibratory, or order to have the patient establish said particular position from a prior RTD session. ### Claim 15 (depends on 1) The method of claim 1, wherein during the first RTD session the pressure sensor(s) are used to determine areas of pressure which would be uncomfortable and therefore unlikely to be reproducible in future RTD sessions, prompting the patient to be repositioned in a manner that is more reproducible for current and future RTD sessions. ### Claim 16 (depends on 7) The method of claim 7, wherein said patient immobilization device is said patient table. ### Claim 17 (depends on 1) The method of claim 1, wherein said patient immobilization device is attached to said patient table.