Implantable array with a reference structure and a method of imaging the same

An implantable electrode array suitable for being placed in anatomic tissue of a human or animal body, comprising:

• a substrate comprising a plurality of notches in at least two adjacent outer edges of the substrate of the electrode array;
• and
• a plurality of electrode contacts at a surface of the substrate,
• wherein each notch of the plurality of notches defines a corresponding grid line extending in a direction perpendicular to the edge in which the corresponding notch is located, each grid line passing through the corresponding notch, and
• wherein the grid lines form a rectangular grid over the surface of the substrate, and
• wherein the electrode contacts are at cross points defined by two of the grid lines,
• so that the plurality of notches define locations of the electrode contacts of the electrode array in MRI images.