Abstract: Systems and methods for calibrating calculations based on catheter-originated measurements. One embodiment comprises a method for calibrating volume calculations for a fluid-filled cavity, such as a heart chamber. In this method, a first catheter configured to measure electrical characteristics and a second catheter configured to measure geometric characteristics are inserted into a fluid-filled cavity. Electrical characteristics of the fluid-filled cavity are measured with the first catheter and geometric characteristics of the cavity are measured with the second catheter. A volume segment is determined based on the measured geometric characteristics of the cavity, and a corresponding volume segment is determined based on the measured electrical characteristics of the cavity. Because the geometric calculation of the volume is known to be more accurate, the volume calculation based on the electrical measurements is adjusted (calibrated) to match the geometric calculation.

Abstract: Systems and methods for measuring electrical potentials and other data associated with body tissue and generating electrograms of the tissue based on the data. In one embodiment, a device for measuring parameters of human tissue includes a multielectrode catheter for taking multiple measurements of the electrical characteristics of the human tissue, a concentric tube catheter located inside the multielectrode catheter, for providing structural support to the multi-electrode catheter and for serving as a conduit for advancing or withdrawing the multielectrode catheter over its surface; and an imaging catheter located inside the concentric tube catheter for taking multiple measurements of anatomical characteristics of the human tissue.

Abstract: A device for measuring parameters of human tissue includes a multielectrode catheter for taking multiple measurements of the electrical characteristics of the human tissue, a concentric tube catheter located inside the multielectrode catheter, for providing structural support to the multi-electrode catheter and for serving as a conduit for advancing or withdrawing the multielectrode catheter over its surface; and an imaging catheter located inside the concentric tube catheter for taking multiple measurements of anatomical characteristics of the human tissue.

Abstract: A device for measuring parameters of human tissue includes a multielectrode catheter for taking multiple measurements of the electrical characteristics of the human tissue, a concentric tube catheter located inside the multielectrode catheter, for providing structural support to the multi-electrode catheter and for serving as a conduit for advancing or withdrawing the multielectrode catheter over its surface; and an imaging catheter located inside the concentric tube catheter for taking multiple measurements of anatomical characteristics of the human tissue.