Visualization of multiple parameters overlaid on an anatomical map

Abstract

To provide methods and systems for improvement in visualizing multiple parameters overlaid on an anatomical map.SOLUTION: A system includes a processor and a display. The processor is configured to: (i) receive a first dataset corresponding to a first property of an organ of a patient, and a second dataset corresponding to a second property of the organ, (ii) assign a first visual attribute to the first property and assign a second visual attribute to the second property, and (iii) produce a map of the organ including an overlay of the first and second visual attributes. The display is configured to display the map.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates generally to medical procedures, and more specifically to a method and system for improving the visualization of a plurality of parameters overlaid on an anatomical map. [Background Art]

[0002] Various techniques for visualizing information on an anatomical map have been disclosed.

[0003] For example, U.S. Patent Application Publication No. 2019 / 0099098 describes a system comprising a display device configured to present a heart map, and a processing unit. The processing unit is configured to receive electrical signals, generate the heart map, and facilitate display of the heart map, each electrical signal corresponding to a map location. The processing unit is also configured to receive a user selection of a selected portion of the heart map, the selected portion comprising a set of map locations, each map location in the set corresponding to an electrical signal of a set of signals that is a subset of the received electrical signals. The set of map locations has a first spatial arrangement, and the processing unit is configured to facilitate display of a set of electrical signal representations, each representation corresponding to one of the set of electrical signals, and the set of electrical signal representations has a second spatial arrangement corresponding to the first spatial arrangement.

[0004] U.S. Patent Application Publication No. 2017 / 0202469 describes a method for generating a graphical representation of cardiac information on a display screen. The method comprises electronically creating or obtaining an anatomical model of a heart including a plurality of heart positions, electronically determining a dataset of source information corresponding to cardiac activity at the plurality of heart positions, and electronically rendering the dataset of source information associated with the plurality of heart positions on the display screen.

[0005] U.S. Patent No. 10,470,682 describes a system for determining electrophysiological data, including an electronic control unit. This electronic control unit is configured to acquire electrophysiological signals from multiple electrodes of one or more catheters, select at least one clique of electrodes from the multiple electrodes to determine multiple local electric field data points, determine the position and orientation of the multiple electrodes, process the electrophysiological signals from at least one clique from the entire set of dipole subcliques to derive local electric field data points associated with at least one clique of electrodes, derive at least one orientation-independent signal from at least one clique of electrodes from information content corresponding to a weighted portion of the potentiometer signal, and display or output catheter orientation-independent electrophysiological information to a user or process.

[0006] U.S. Patent Application Publication 2013 / 0151275 describes a system and method that enables study planners to visualize available clinical capacity in various geographical locations in the form of icons arranged according to geographical conditions. In certain embodiments, the present invention provides a display including icons indicating research capacity in multiple geographical areas. Each icon has an embodiment that indicates the combined capacity of multiple laboratories located in the geographical area. This capacity may relate to available patient populations, clinical capacity, or local environment. [Overview of the Initiative] [Means for solving the problem]

[0007] Embodiments of the present invention described herein provide a system including a processor and a display. The processor is configured to (i) receive a first dataset corresponding to a first characteristic of a patient's organ and a second dataset corresponding to a second characteristic of the organ; (ii) assign first visual attributes to the first characteristic and second visual attributes to the second characteristic; and (iii) generate a map of the organ including an overlay of the first and second visual attributes. The display is configured to display the map.

[0008] In some embodiments, a first dataset includes a first measurement of a first characteristic, a second dataset includes a second measurement of a second characteristic, a first visual attribute includes a color group containing multiple colors, a second visual attribute includes a texture group containing multiple texture types, and the processor is configured to map the first measurement to each color in the color group and the second measurement to each texture in the texture group. In some embodiments, the map includes multiple sections on the surface of an organ, each of which includes at least one of the first measurement and the second measurement, and the processor is configured to (a) check the first measurement and the second measurement in each of the multiple sections, and (b) assign to the map at least one of (i) a color from each color corresponding to the first measurement and (ii) a texture from the textures corresponding to the second measurement. In yet another embodiment, the organ includes a heart, and the first and second characteristics are selected from a list of characteristics consisting of voltage, local activation time (LAT), atrial fibrillation cycle length (CL), and standard deviation of CL (STD).

[0009] Embodiments of the present invention further provide a method including receiving a first dataset corresponding to a first characteristic of a patient's organ and a second dataset corresponding to a second characteristic of the organ. The first visual attributes are assigned to the first characteristic, and the second visual attributes are assigned to the second characteristic. A map of the organ is generated and displayed, including overlays of the first and second visual attributes. [Brief explanation of the drawing]

[0010] This invention will be more fully understood by considering the following "Modes for Carrying Out the Invention" in conjunction with the drawings. [Figure 1]This is a schematic diagram illustrating a catheter-based tracking and ablation system according to an exemplary embodiment of the present invention. [Figure 2] This diagram shows the parameters of each of the multiple virtual attributes overlaid on a map of the patient's heart, according to an exemplary embodiment of the present invention. [Figure 3] This flowchart schematically illustrates a method for presenting multiple parameters overlaid on a cardiac map according to an exemplary embodiment of the present invention. [Modes for carrying out the invention]

[0011] Overview During minimally invasive medical procedures such as cardiac ablation, physicians may use an anatomical map of the patient's heart, along with display parameters that may help the physician perform the ablation.

[0012] Some procedures require displaying multiple parameters across an entire anatomical map. In principle, several anatomical maps may be displayed, with different parameters shown on each map. However, this method requires the physician to switch between maps during the procedure, potentially leading to errors when performing the procedure. For example, errors can occur when the physician makes assumptions about the values ​​of certain parameters (among a group of parameters) in an inaccurate location of the heart.

[0013] The exemplary embodiments of the present invention described below provide an improved technique for presenting multiple parameters overlaid on a single anatomical map. Such a presentation would provide a physician with numerical indicators of all necessary parameters in different regions across the entire area of ​​the anatomical map.

[0014] In some exemplary embodiments, the cardiac ablation system comprises a processor configured to receive multiple datasets corresponding to multiple respective characteristics of the heart. Each dataset contains multiple data points, such as measurements taken at multiple sections of the heart, associated with each section of the heart. Each section corresponds to a different region on the surface of the anatomical map of the heart.

[0015] In some exemplary embodiments, the processor is configured to generate a map containing visual attributes indicating measurements and / or other parameters, which are overlaid on the anatomical map. The processor is further configured to display the visual attributes overlaid on the anatomical map on the system's display.

[0016] In some exemplary embodiments, the dataset may include measured and / or calculated values ​​of various cardiac parameters obtained from different sections of the heart. For example, cardiac parameters may include local activation time (LAT), inter-peak voltage, cycle length (CL), and standard deviation of cycle length (STD) in atrial fibrillation.

[0017] In some exemplary embodiments, the dataset may include the output of one or more algorithms that enable the detection of complex schizoid atrial potentials (CFAEs) in an intracardiac electrocardiogram (IC-ECG) based on parameters defined by a user of the system (e.g., a physician). For example, (i) the shortest complex interval (SCI) for calculating the value of the shortest interval between two consecutive CFAEs in the IC-ECG signal, and (ii) the interval confidence level (ICL) if the IC-ECG signal contains two or more adjacent CFAE complexes, provide the number of CFAE intervals. Additionally or alternatively, in terms of atrial fibrillation ripple frequency measured in voltage (mV) over time (ms), the dataset may include (i) the number of peaks detected, and (ii) the percentage of signals with voltages higher than a predefined threshold.

[0018] In some exemplary embodiments, the processor is configured to generate a map including an anatomical map and two or more visual attributes of each parameter to be overlaid on the anatomical map. The processor is further configured to display the map on the display of the cardiac ablation system. For example, a physician can select a pair of parameters as described above (e.g., LAT and inter-peak voltage, or CL and STD of CL, or SCI and ICL), and the processor assigns visual attributes to each of the selected parameters and displays those visual attributes on the anatomical map of the heart.

[0019] In some exemplary embodiments, the processor is configured to replace or remove at least one of the parameters from the display, and to select any preferred combination of parameters to be displayed on an anatomical map of the heart, or on any other type of map of any other organ in question.

[0020] The disclosed technology provides physicians with the ability to present any selected set of parameters to be overlaid on an anatomical map, and thus helps (i) improve the quality of cardiac ablation procedures or any other medical procedures that require the display of multiple parameters on a map of the organ in question, and (ii) reduce the cycle time of such procedures.

[0021] System Description Figure 1 is a schematic diagram of a catheter-based tracking and ablation system 20 according to an exemplary embodiment of the present invention.

[0022] In some embodiments, the system 20 comprises a catheter 22, which in this example is a cardiac catheter, and a control console 24. In the exemplary embodiments described herein, the catheter 22 may be used for any preferred therapeutic and / or diagnostic purposes, such as tissue ablation within the heart 26.

[0023] In some exemplary embodiments, console 24 comprises a processor 41, which is typically a general-purpose computer, having front-end circuitry and interface circuitry 38 that is suitable for receiving signals via catheter 22 and suitable for controlling other components of system 20 described herein. The console 24 further comprises a user display 35 configured to receive map 27 of heart 26 from processor 41 and to display map 27.

[0024] In some exemplary embodiments, map 27 may comprise any suitable type of anatomical map generated using any suitable technique. For example, an anatomical map may be generated using anatomical images produced by a suitable medical imaging system, or using fast anatomical mapping (FAM) technique with the CARTO™ system produced by Biosense Webster Inc. (Irvine, Calif.), or using any other suitable technique, or using any suitable combination of the foregoing.

[0025] In some exemplary embodiments, processor 41 is configured to receive a plurality of data sets corresponding to a plurality of respective characteristics of heart 26. Each data set comprises a plurality of data points, such as measurements acquired in a plurality of sections of heart 26 or other types of parameters associated with a respective section of heart 26. Each section corresponds to a different region on the surface of map 27.

[0026] In some exemplary embodiments, processor 41 is configured to generate map 27 comprising visual attributes (VAs) indicating measured values and / or other parameters that are overlaid onto map 27. Processor 41 is further configured to display the VAs overlaid onto map 27 on display 35, for example, as detailed shown and described in Figure 2 below.

[0027] In some exemplary embodiments, such as cardiac tissue ablation, physician 30 may use a map 27 having a VA overlaid on the map to plan the procedure in advance and / or during the ablation procedure.

[0028] Refer to inset 23 here. In some exemplary embodiments, when performing an ablation procedure, physician 30 inserts a catheter 22 through the vascular system of a patient 28 lying on a table 29. The catheter 22 includes one or more ablation electrodes 40 attached to its distal end. The electrodes 40 are configured to ablate tissue at a target location in the heart 26. Physician 30 navigates the distal end of the catheter 22 to approach the target location in the heart 26 by using a manipulator 32 to manipulate the catheter 22.

[0029] In other exemplary embodiments, the catheter 22 may include a sensing electrode (not shown) configured to generate a signal indicating an electrophysiological (EP) signal in response to sensing an EP signal within the tissue of the heart 26. In such embodiments, the proximal end of the catheter 22 is connected, among other things, to an interface circuit 38 to transmit these signals to a processor 41.

[0030] In some exemplary embodiments, the position of the distal end within the cardiac chamber is measured using a position sensor (not shown) of a magnetic position tracking system. In this example, the console 24 includes a drive circuit 34 configured to drive a magnetic field generator 36 located at a known external location of the patient 28 reclining on a table 29, for example, under the patient's torso. The position sensor is coupled to the distal end and is configured to generate a position signal in response to a sensed external magnetic field from the magnetic field generator 36. The position signal indicates the position of the distal end of the catheter 22 in the coordinate system of the position tracking system.

[0031] This position sensing method is implemented in various medical applications, for example, in the CARTO® system manufactured by Biosense Webster Inc. (Irvine, Calif.), and is detailed in U.S. Patents 5,391,199, 6,690,963, 6,484,118, 6,239,724, 6,618,612 and 6,332,089, International Publication 96 / 05768, and U.S. Patent Application Publications 2002 / 0065455(A1), 2003 / 0120150(A1) and 2004 / 0068178(A1), all of which are incorporated herein by reference.

[0032] In some exemplary embodiments, the coordinate system of the position tracking system is aligned with the coordinate systems of system 20 and map 27, and as a result, the processor 41 is configured to display the position of the distal end of the catheter 22 on map 27.

[0033] In some exemplary embodiments, the processor 41 typically includes a general-purpose computer programmed with software to perform the functions described herein. The software can be downloaded to the computer in electronic form, for example, over a network, or alternatively or additionally, it can be provided and / or stored on a non-temporary physical medium such as magnetic memory, optical memory, or electronic memory.

[0034] This particular configuration of System 20 is shown as an example to illustrate the specific problems addressed by the exemplary embodiments of the present invention and to demonstrate the application of these embodiments in improving the performance of such systems. However, the exemplary embodiments of the present invention are not limited to this particular type of exemplary system, and the principles described herein may be similarly applied to other types of medical systems.

[0035] Virtual attributes overlaid on an anatomical map Figure 2 is a schematic diagram of several virtual attributes overlaid on a map 27 of the heart 26, showing their respective parameters according to an exemplary embodiment of the present invention.

[0036] In some exemplary embodiments, the processor 41 receives two datasets corresponding to two parameters measured in different sections of the heart 26. In this example, the first parameter corresponds to local activation time (LAT), and the second parameter corresponds to voltage. In the context of this disclosure and the claims, the term voltage may be an inter-peak voltage measured within the tissue of the heart 26, or any other voltage measured within the tissue of any other organ of the patient 28.

[0037] In some exemplary embodiments, the processor 41 is configured to (i) assign a first visual attribute (VA) 55 to a LAT measurement and (ii) assign a second VA 66 to a voltage measurement.

[0038] In this embodiment, VA55 includes color groups arranged on a color scale having multiple colors and color gradients, where each color represents a corresponding range of LAT relative to a predefined reference LAT. For example, color 52 (e.g., red gradient) represents a LAT of approximately -50ms to -10ms, color 54 (e.g., yellow gradient) represents a LAT of approximately 10ms to 50ms, color 56 (e.g., green gradient) represents a LAT of approximately 50ms to 90ms, and color 58 (e.g., blue gradient) represents a LAT of approximately 90ms to 130ms. Note that negative values ​​of LAT (e.g., approximately -50ms to -10ms for the red gradient) are measured relative to the aforementioned predefined reference LAT.

[0039] In some exemplary embodiments, VA66 includes a texture scale having multiple types of textures, each texture representing a corresponding voltage range. In this example, VA66 includes (i) a texture 60 having a wave shape and representing low voltages (e.g., about 0.05 mV to 0.5 mV), (ii) a texture 62 having an "X" shaped array and representing medium voltages (e.g., about 0.5 mV to 1.5 mV), and (iii) a blank (i.e., without a pattern) texture 64 representing high voltages (e.g., about 1.5 mmV). Grayscale, shading, and / or shading are used to represent color in this application.

[0040] In the context of this disclosure and in the claims, the terms “about” or “approximately” used with respect to any number or range of numbers indicate a reasonable tolerance of dimensions that enables a part or set of components to function in accordance with its intended purpose as described herein.

[0041] In some exemplary embodiments, based on a dataset and assigned VA55 and 66, the processor 41 is configured to generate a map 27 including overlays of VA55 and 66 for each section of the map 27, and to display the map on the display 35. For example, (i) section "A" has color 54 and texture 64, (ii) section "B" has color 52 and texture 62, (iii) section "C" has color 52 and texture 64, and (iv) section "D" located close to the small hole 50 of the heart 26 has color 56 and texture 60.

[0042] In some exemplary embodiments, a map 27 with overlaid LAT and voltages provides a physician 30 with a presentation showing two or more parameters in each section of the heart 26. For example, sections "B" and "C" are adjacent and have similar LATs but different voltages, and section "D" with low voltages is surrounded by sections with medium and major high voltages.

[0043] In principle, it is possible to generate multiple maps, each having one parameter that is overlaid on the map of the heart 26; however, such a presentation cannot provide the physician with a presented combination of two or more parameters in the section of the heart 26 that is of interest.

[0044] In other exemplary embodiments, the processor 41 is configured to generate a map 27 having three or more parameters, for example, using a different set of patterns and / or numbers and / or any other appropriate notifications for each type of parameter.

[0045] In an alternative exemplary embodiment, instead of, or in addition to, LAT and voltage, the processor 41 is configured to generate a map 27 having other visual attributes that indicate other parameters such as the cycle length of atrial fibrillation and the standard deviation of the aforementioned cycle length, but is not limited to these.

[0046] In some exemplary embodiments, the dataset may include the output of one or more algorithms that enable the detection of complex schizoid atrial potentials (CFAEs) in an intracardiac electrocardiogram (IC-ECG) based on parameters defined by physician 30. For example, (i) a shortest complex interval (SCI) for calculating the value of the shortest interval between two consecutive CFAEs in the IC-ECG signal, and (ii) an interval confidence level (ICL) if the IC-ECG signal contains two or more adjacent CFAE complexes, providing the number of CFAE intervals. Additionally or alternatively, in terms of atrial fibrillation ripple frequency measured in voltage (mV) over time (ms), the dataset may include (i) the number of peaks detected, and (ii) the percentage of signals with voltages higher than a predefined threshold.

[0047] This particular set of visual attributes, such as the colors and / or textures shown in Figure 2 and / or described above, is provided as an example to illustrate the specific problems addressed by embodiments of the present invention and to demonstrate that these embodiments are applicable to improving the performance of such systems. Embodiments of the present invention are not limited to this particular type of exemplary parameter and / or visual attribute, and the principles described herein may also be applied to other types of maps having any other suitable parameter and / or visual attribute.

[0048] Figure 3 is a schematic flowchart illustrating a method for presenting multiple parameters overlaid on map 27 according to an exemplary embodiment of the present invention.

[0049] This method begins in a data set reception step 100 using a processor 41 (or any other suitable device) configured to receive a first data set and a second data set corresponding to a first and second characteristic of the heart 26 or any other organ of patient 28, in this example the parameters may include measurements taken within the heart 26, as detailed in Figures 1 and 2 above.

[0050] In the visual attribute assignment step 102, the processor 41 (or any other suitable device) assigns the first and second visual attributes, such as VA55 and VA66 as detailed in Figure 2 above, to the first and second characteristics (e.g., LAT and voltage), respectively.

[0051] In the map generation step 104, the processor 41 (or any other suitable device) generates a map 27 of the heart 26 or any other organ as described above. In some exemplary embodiments, the map 27 includes an anatomical map of the heart 26 (obtained using any preferred technique) having VA55 and 66 overlaid on the anatomical map.

[0052] In the final map display step 106 of this method, the processor 41 (or any other suitable device) displays the map 27 on any suitable output device, such as the display 35, as detailed in Figure 2 above, but not limited to these devices.

[0053] While the exemplary embodiments described herein primarily address the presentation of atrial fibrillation (AF) parameters on an anatomical map of the heart, the methods and systems described herein can also be used for other parameters of AF, such as when displaying the normal CL in AF along with the standard deviation (STD) of cycle length (CL), and the sections containing the minimum CL and the STD of CL are intended to be ablated. Furthermore, the methods and systems described herein can also be used for other applications, such as when presenting multiple parameters of ventricular fibrillation, or any two or more other parameters presented on an anatomical map of any organ in question, on an anatomical map.

[0054] Accordingly, it will be understood that the exemplary embodiments described above are cited as examples only, and that the present invention is not limited to those specifically shown and described above. Rather, the scope of the present invention includes both combinations and partial combinations of the various features described in the above specification, as well as variations and modifications thereof not disclosed in the prior art, which would be conceivable to those skilled in the art by reading the foregoing description. Documents incorporated into this patent application by reference shall be considered integral parts of this application, except that, in such incorporated documents, only the definitions provided herein shall be considered to the extent that any term is defined in a manner inconsistent with the definitions provided herein, either expressly or implicitly.

[0055] [Implementation Method] (1) A system for visualizing multiple parameters overlaid on an anatomical map, A processor configured to (i) receive a first dataset corresponding to a first characteristic of a patient's organ and a second dataset corresponding to a second characteristic of the organ; (ii) assign a first visual attribute to the first characteristic and a second visual attribute to the second characteristic; and (iii) generate a map of the organ including an overlay of the first and second visual attributes. A system comprising a display configured to display the aforementioned map. (2) The system according to Embodiment 1, wherein the first dataset includes a first measurement of the first characteristic, the second dataset includes a second measurement of the second characteristic, the first visual attribute includes a color group including a plurality of colors, the second visual attribute includes a texture group including a plurality of texture types, and the processor is configured to map the first measurement to each color in the color group and to map the second measurement to each texture in the texture group. (3) The system according to Embodiment 2, wherein the map includes a plurality of sections on the surface of the organ, each of the plurality of sections includes at least one of the first measurement and the second measurement, and the processor is configured to (a) check the first measurement and the second measurement in each of the plurality of sections, and (b) assign to the map at least one of (i) a color from the respective colors corresponding to the first measurement and (ii) a texture from the textures corresponding to the second measurement. (4) The system according to Embodiment 1, wherein the organ includes a heart, and the first and second characteristics are selected from a list of characteristics consisting of voltage, local activation time (LAT), atrial fibrillation cycle length (CL), and standard deviation of CL (STD). (5) A method for visualizing multiple parameters overlaid on an anatomical map, Receiving a first dataset corresponding to a first characteristic of the patient's organ, and a second dataset corresponding to a second characteristic of the organ, Assigning a first visual attribute to the first characteristic, and assigning a second visual attribute to the second characteristic, To generate a map of the organ including overlays of the first and second visual attributes, A method including displaying the aforementioned map.

[0056] (6) The method according to Embodiment 5, wherein receiving the first dataset includes receiving a first measurement of the first characteristic, and receiving the second dataset includes receiving a second measurement of the second characteristic, (i) assigning the first visual attribute includes assigning a color group containing multiple colors and mapping the first measurement to each color in the color group, and (ii) assigning the second visual attribute includes assigning a texture group containing multiple texture types and mapping the second measurement to each texture in the texture group. (7) The method according to Embodiment 6, wherein the map includes a plurality of sections on the surface of the organ, each of the plurality of sections includes at least one of the first measurement and the second measurement, and assigning the first visual attribute and the second visual attribute includes, in each of the plurality of sections, (a) checking the first measurement and the second measurement, and (b) assigning to the map at least one of (i) a color from the respective colors corresponding to the first measurement and (ii) a texture from the textures corresponding to the second measurement. (8) The method according to Embodiment 5, wherein the organ includes a heart, and the first and second characteristics are selected from a list of characteristics consisting of voltage, local activation time (LAT), cycle length of atrial fibrillation (CL), and standard deviation of CL (STD).

Claims

1. A system for visualizing multiple parameters overlaid on an anatomical map, A processor configured to (i) receive a first dataset corresponding to a first characteristic of a patient's organ and a second dataset corresponding to a second characteristic of the organ; (ii) assign a first visual attribute to the first characteristic and a second visual attribute to the second characteristic; and (iii) generate a map of the organ including an overlay of the first and second visual attributes. The system includes a display configured to display the aforementioned map, The organ includes the heart, and the first and second characteristics are selected from a list of characteristics consisting of voltage, local activation time (LAT), atrial fibrillation cycle length (CL), and standard deviation of CL (STD). A system in which the list further includes (i) the shortest complex interval (SCI) for calculating the value of the shortest interval between two consecutive complex split atrial potentials (CFAEs) in an intracardiac electrocardiogram (IC-ECG) signal; (ii) if the IC-ECG signal includes two or more adjacent CFAE complexes, an interval confidence (ICL) indicating the number of intervals between the CFAEs; (iii) the number of peaks detected at the ripple frequency of atrial fibrillation measured in voltage (mV) against time (ms); and (iv) the percentage of signals having a voltage higher than a predefined threshold at the ripple frequency of atrial fibrillation measured in voltage (mV) against time (ms).

2. The system according to claim 1, wherein the first dataset includes first measurements of the first characteristic, the second dataset includes second measurements of the second characteristic, the first visual attribute includes a color group including a plurality of colors, the second visual attribute includes a texture group including a plurality of texture types, and the processor is configured to map the first measurements to each color in the color group and to map the second measurements to each texture in the texture group.

3. The system according to claim 2, wherein the map includes a plurality of sections on the surface of the organ, each of the plurality of sections includes at least one of the first measurement and the second measurement, and the processor is configured to (a) check the first measurement and the second measurement in each of the plurality of sections, and (b) assign to the map at least one of (i) a color from the respective colors corresponding to the first measurement and (ii) a texture from the textures corresponding to the second measurement.

4. A method for visualizing multiple parameters overlaid on an anatomical map, Receiving a first dataset corresponding to a first characteristic of the patient's organ, and a second dataset corresponding to a second characteristic of the organ, Assigning a first visual attribute to the first characteristic, and assigning a second visual attribute to the second characteristic, To generate a map of the organ including an overlay of the first visual attribute and the second visual attribute, This includes displaying the aforementioned map, The organ includes the heart, and the first and second characteristics are selected from a list of characteristics consisting of voltage, local activation time (LAT), atrial fibrillation cycle length (CL), and standard deviation of CL (STD). A method comprising: (i) the shortest complex interval (SCI) for calculating the value of the shortest interval between two consecutive complex split atrial potentials (CFAEs) in an intracardiac electrocardiogram (IC-ECG) signal; (ii) if the IC-ECG signal includes two or more adjacent CFAE complexes, an interval confidence (ICL) indicating the number of intervals between the CFAEs; (iii) the number of peaks detected at the ripple frequency of atrial fibrillation measured in voltage (mV) against time (ms); and (iv) the percentage of signals having a voltage higher than a predefined threshold at the ripple frequency of atrial fibrillation measured in voltage (mV) against time (ms).

5. The method according to claim 4, wherein receiving the first dataset includes receiving a first measurement of the first characteristic, and receiving the second dataset includes receiving a second measurement of the second characteristic, (i) assigning the first visual attribute includes assigning a color group comprising a plurality of colors and mapping the first measurement to each color in the color group, and (ii) assigning the second visual attribute includes assigning a texture group comprising a plurality of texture types and mapping the second measurement to each texture in the texture group.

6. The method according to claim 5, wherein the map includes a plurality of sections on the surface of the organ, each of the plurality of sections includes at least one of the first measurement and the second measurement, and assigning the first visual attribute and the second visual attribute includes, in each of the plurality of sections, (a) checking the first measurement and the second measurement, and (b) assigning to the map at least one of (i) a color from the respective colors corresponding to the first measurement and (ii) a texture from the textures corresponding to the second measurement.

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