# US 2021/0259659 A1 · Intravascular ultrasound rotation tracking > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0259659 A1 - Document ID: US20210259659A1 - Status: Published application - Kind: A1 - Application number: 17/250,150 - Filed: 2019-06-18 - Published: 2021-08-26 - Earliest claimed: 2018-06-19 - Assignees: Koninklijke Philips N.V. - Applicants: Koninklijke Philips N.V. - Inventors: Frank Michael WEBER; Michael GRASS - Web page: https://patentgrep.com/patent/US20210259659A1 ## CPC - A61B 8/0841: {for locating instruments} - A61B 8/12: in body cavities or body tracts, e.g. by using catheters - A61B 8/4245: {involving determining the position of the probe, e.g. with respect to an external reference frame or to the patient} - A61B 8/4254: {using sensors mounted on the probe} - A61B 8/483: {involving the acquisition of a 3D volume of data} - A61B 8/5246: {combining images from the same or different imaging techniques, e.g. color Doppler and B-mode} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A controller (260) for identifying rotation of an interventional medical device (252) includes a memory that stores instructions and a processor that executes the instructions. When executed by the processor, the instructions cause the controller (260) to execute a process that includes receiving (S410) a first signal emitted from the interventional medical device (252) and corresponding to a first predetermined direction relative to the interventional interventional medical device (252) relative to a fixed rotation. ## Claims ### Claim 1 A controller (260) for identifying rotation of an interventional medical device (252), comprising: a memory (262) that stores instructions; and a processor (261) that executes the instructions, wherein, when executed by the processor (261), the instructions cause the controller (260) to execute a process comprising: receiving a first signal (S410) emitted from the interventional medical device (252) and corresponding to a first predetermined direction relative to the interventional medical device (252); determining (S420), based on the first signal, a first rotation of the interventional medical device (252) relative to a fixed rotation. ### Claim 2 (depends on 1) The controller (260) of claim 1, wherein the process performed by the controller (260) further comprises: adjusting (S430) an image taken by the interventional medical device (252) based on the first rotation. ### Claim 3 (depends on 1) The controller (260) of claim 1, wherein the process performed by the controller (260) further comprises: receiving (S440) a second signal emitted from the interventional medical device (252) and corresponding to a second predetermined direction relative to the interventional medical device (252); determining (S450), based on the second signal, a second rotation of the interventional medical device (252) relative to the fixed rotation. ### Claim 4 (depends on 3) The controller (260) of claim 3, wherein the process performed by the controller (260) further comprises: adjusting (S430) a first image taken by the interventional medical device (252) based on the first rotation determined based on the first signal; adjusting (S460) a second image taken by the interventional medical device (252) based on the second rotation determined based on the second signal, and aligning (S470) the first image and the second image to construct a 3-dimensional volume. ### Claim 5 (depends on 3) The controller (260) of claim 3, wherein the first signal and the second signal are emitted at predetermined angles (f1 to f8) from and relative to the interventional medical device (252). ### Claim 6 (depends on 5) The controller (260) of claim 5, wherein at least one of the first rotation and the second rotation is determined based on both the first signal and the second signal. ### Claim 7 (depends on 3) The controller (260) of claim 3, wherein the process performed by the controller (260) further comprises: adjusting (S460) a second image taken by the interventional medical device (252) based on the second rotation determined based on the second signal, and aligning (S470) a first image taken by the interventional medical device (252) with the second image to construct a 3-dimensional volume. ### Claim 8 (depends on 1) The controller (260) of claim 1, wherein the first signal is one of a plurality of signals emitted at different frequencies at fixed rotational angles (f1 to f8) relative to the interventional medical device (252). ### Claim 9 (depends on 8) The controller (260) of claim 8, wherein the process performed by the controller (260) further comprises: weighting (S615), each of a subset of the plurality of signals received at the controller (260); and determining (S620) the first rotation based on the weighting. ### Claim 10 (depends on 9) The controller (260) of claim 9, wherein the weighting is based on a signal strength of each of the subset of the plurality of signals received at the controller (260). ### Claim 11 (depends on 9) The controller (260) of claim 9, wherein the weighting is based on a power spectrum of the plurality of signals. ### Claim 12 (depends on 1) The controller (260) of claim 1, wherein the interventional medical device (252) comprises an intravascular ultrasound catheter (252). ### Claim 13 (depends on 12) The controller (260) of claim 12, wherein the first signal is emitted while the intravascular ultrasound catheter is inserted into a vessel during a medical intervention. ### Claim 14 (depends on 1) The controller (260) of claim 1, wherein the controller (260) is implemented in a system that includes an ultrasound imaging probe (256), and wherein imagery from the ultrasound imaging probe (256) is fused with imagery from the interventional medical device (252) based on the first rotation. ### Claim 15 (depends on 1) The controller (260) of claim 1, wherein the controller (260) is implemented in a system that includes an ultrasound imaging probe (256), and wherein imagery from the ultrasound imaging probe (256) is registered with imagery from the interventional medical device (252) based on the first rotation. ### Claim 16 (depends on 15) The controller (260) of claim 15, wherein the interventional medical device (252) is within a field of view of the ultrasound imaging probe (256) when the first signal is emitted by the interventional medical device (252). ### Claim 17 (depends on 15) The controller (260) of claim 15, wherein the process performed by the controller (260) further comprises: receiving (S440) a second signal emitted from the interventional medical device (252) and corresponding to a second predetermined direction relative to the interventional medical device (252); determining (S450), based on the second signal, a second rotation of the interventional medical device (252) relative to the fixed rotation; and analyzing at least one of a run length of the first signal and a run length of the second signal to enable tracking of the interventional medical device (252) relative to the ultrasound imaging probe (256), wherein the interventional medical device (252) and the ultrasound imaging probe (256) are correlated to a clock in common. ### Claim 18 (depends on 1) The controller (260) of claim 1, wherein the process performed by the controller (260) further comprises: fusing, based on determining the first rotation, intravascular ultrasound imagery from the interventional medical device (252) with either transesophageal echocardiogram (TEE) imagery or transthoracic echocardiogram (TTE) imagery. ### Claim 19 A method for identifying rotation of an interventional medical device (252), comprising: receiving (S410) a first signal emitted from the interventional medical device (252) and corresponding to a first predetermined direction relative to the interventional medical device (252); determining (S420), based on the first signal, a first rotation of the interventional medical device (252) relative to a fixed rotation. ### Claim 20 A system for identifying rotation of an interventional medical device (252), comprising: the interventional medical device (252); an ultrasound imaging probe (256) that captures imagery in a space that includes the interventional medical device (252); and a controller (260) with a memory (262) that stores instructions and a processor (261) that executes the instructions, wherein, when executed by the processor (261), the instructions cause the controller (260) to execute a process comprising: receiving (S410) a first signal emitted from the interventional medical device (252) and corresponding to a first predetermined direction relative to the interventional medical device (252); determining (S420), based on the first signal, a first rotation of the interventional medical device (252) relative to a fixed rotation.