Figure 1.
(a) The angle γ refers to the initial angle of the catheter shaft relative to the direction of the main magnetic field, B0. (b) The absolute tip angle refers to the angle formed by the line tangential to the distal tip of the catheter and the initial position of the catheter shaft. The assumption is made that the catheter is immobilized at the point on the proximal end, indicated by the arrow. (c) The base to tip angle refers to the angle formed by the line that connects the catheter tip to the point of immobilization and the initial position of the catheter shaft.