Techniques relating to correction of image distortion caused by movement of a camera unit during image capture. Further, a hollow core tube 300 is provided having a fluid permeable wall 310, the core tube being positioned within the axial opening of the mesh pack. Then, sidewall spacers may be formed over the segmented heater to define an aperture between the sidewall spacers that may act as a mask for etching the stop layer over the segmented heater. Based at least in part on the projection current measurement, the adjusting the commanded voltage signal and the commanded angle signal can be adjusted. Then the brown body is sintered. A source of fluid is connectable to the wire member for delivering fluid via the port into the lumen for expanding the balloon.