A diagnostic system for use during an ablation procedure comprising: an intracardiac echo catheter having an ultrasound transducer configured to generate a first ultrasound echo data set representing a base line temperature at a first time and a second ultrasound echo data set representing a temperature at a second time different from the first time and representative of the received ultrasonic energy during the ablation procedure; a visualization, navigation, or mapping 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 representing tissue temperature at the first time 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 representing tissue temperature at the second time onto the one or more voxel elements; an electronic control unit 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; a display device configured to display the graphical user interface; wherein the ECU compares the first mapped value with the second mapped value to generate a temperature change value and to change display values of each corresponding voxel element for reflecting the temperature change thereby causing the two dimensional rendering to be updated accordingly. an intracardiac echo catheter having an ultrasound transducer configured to generate a first ultrasound echo data set representing a base line temperature at a first time and a second ultrasound echo data set representing a temperature at a second time different from the first time and representative of the received ultrasonic energy during the ablation procedure; a visualization, navigation, or mapping 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 representing tissue temperature at the first time 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 representing tissue temperature at the second time onto the one or more voxel elements; an electronic control unit 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; a display device configured to display the graphical user interface; wherein the ECU compares the first mapped value with the second mapped value to generate a temperature change value and to change display values of each corresponding voxel element for reflecting the temperature change thereby causing the two dimensional rendering to be updated accordingly.