Improving mapping of an anatomical cavity and/or location tracking in the anatomical cavity

A processing system for generating feedback information responsive to positions of one or more field generators on the surface of a subject, wherein the one or more field generators are usable for generating one or more electric, magnetic and/or electromagnetic fields for tracking the location of an interventional device in the subject and are external to the processing system, the processing system comprising:

• an input interface configured to receive;
• non-invasive imaging data of a subject, wherein the non-invasive imaging data contains a representation of one or more anatomical structures of the subject and the one or more field generators positioned on the surface of the subject,
• wherein the non-invasive imaging data is generated through a non-invasive imaging procedure of the subject and the one or more field generators;
• a processing unit communicatively coupled to the input interface and configured to;
• process the non-invasive imaging data to determine a spatial relationship between the one or more anatomical structures of the subject and the one or more field generators;
• and
• generate the feedback information responsive to the determined spatial relationship, wherein the feedback information comprises:
• calibration information for an anatomical mapping system and/or location tracking system that uses, when generated, the one or more electric, magnetic and/or electromagnetic fields generated using the one or more field generators to perform an anatomical mapping or location tracking operation respectively:
• and/or
• repositioning information indicating any recommended positional changes for the one or more field generators to realize a desired spatial relationship between the one or more anatomical structures of the subject and the one or more field generators, wherein the desired spatial relationship causes the one or more electric, magnetic and/or electromagnetic fields, when generated by the one or more field generators having the desired spatial relationship with respect to the one or more anatomical structures, to lie at respective desired locations:
• and optionally an output interface configured to provide the feedback information.