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US 2014/0350400 A1Published application
Lesion assessment using six degree of freedom ultrasound thermography
AssigneeSt. Jude Medical, Atrial Fibrillation Division, Inc.
InventorAnthony D. Hill
Life of this patent
Estimating the term…
Abstract
A diagnostic device and method for assessing lesion formation by measuring temperature changes during endocardial ablation. Intracardiac echo catheter data is accurately mapped into a model maintained by a visualization, navigation, or mapping system using the position and orientation of the intracardiac echo catheter transducer within the model. For each point in the model, either a frequency shift or echo time shift is calculated from the intracardiac echo data to determine local temperature changes, and the local temperature changes are displayed within a rendering of the model for the user.
Claims20
A diagnostic system comprising:
- an intracardiac echo catheter having an ultrasound transducer configured to generate a first ultrasound echo data set and a second ultrasound echo data set representative of the received ultrasonic energy;
- a visualization, navigation, or mapping (VNM) system configured to generate a model of a body cavity, track the position of the ultrasound transducer within the model, generate one or more voxel elements within the model, and generate a two dimensional rendering of the model, the VNM system being further configured to receive the first ultrasound echo data set and generate a first mapped value by mapping at least a portion of the first ultrasound echo data set onto the one or more voxel elements, the VNM system being further configured to receive the second ultrasound echo data set and generate a second mapped value by mapping at least a portion of the second ultrasound data set onto the one or more voxel elements;
- a display device configured to display a graphical user interface;
- an electronic control unit (ECU) in communication with the intracardiac echo catheter, the VNM system, and the display device and being configured to receive the first ultrasound echo data set, the second ultrasound echo data set, the two dimensional rendering, and one or more user inputs directing the control of one or more of the intracardiac catheter and the VNM system, the ECU being further configured to generate a graphic user interface containing at least the two dimensional rendering;
- wherein the VNM system compares the first mapped value with the second mapped value to generate a temperature change value.
2 more elements
A method of measuring temperature changes at a tissue treatment site comprising the steps of:
- generating a model of the treatment area;
- locating at least one intracardiac echo catheter within the model;
- receiving a first ultrasound echo data set from the intracardiac echo catheter;
- mapping the first ultrasound echo data set onto one or more voxel elements within the model of the treatment area;
- beginning treatment of the tissue;
- receiving a second ultrasound echo data set from the intracardiac echo catheter;
- mapping the second ultrasound echo data set onto one or more voxel elements within the model of the treatment area;
- and
- generating a temperature change value for each of the one or more voxel element by comparing the mapped portion of the first ultrasound echo data set and the mapped portion of the second ultrasound echo data set.
6 more elements
A diagnostic device comprising:
- an electronic control unit (ECU) in communication with an intracardiac echo catheter, a visualization, navigation, or mapping (VNM) system, and a display device, the ECU being configured to receive a plurality of ultrasound echo signals and a catheter position and orientation signal, the ECU being further configured to generate a model of a body cavity and locate the intracardiac echo catheter within the model using the catheter position and orientation signal, the model being configured to include one or more voxel elements having a display value and a data value, the ECU being further configured to generate a set of echo data elements from each received ultrasound echo signal, each echo data element being mapped onto one of the one or more voxel elements based on the catheter position and orientation signal,
- wherein the ECU generates a first set of echo data elements, maps each element from the first set of echo data elements onto a mapped voxel element from the one or more voxel elements, and stores the echo data element as the data value of the mapped voxel element, thereby creating a set of mapped voxel elements, the ECU then generates a second set of echo data elements, maps one or more elements from the second set of echo data elements onto at least one voxel element from the set of mapped voxel elements, and for each mapped voxel element on which an echo data element from the second set of data elements is mapped, the ECU generates a display value representing a temperature change for the voxel element using the data value and the second data element.
Dependencies are inferred from the claim text.