A method for calibration of an imaging system includes providing a calibration phantom system including a first phantom element material block having a first surface at a first height, wherein the first phantom element material block at least partially includes a first material having a first attenuation coefficient. The laser removes integral dilation beads from the neck regions andor the tapered regions of a blow molded balloon. The profile sections at the Z distances are joined smoothly with one another to form a complete airfoil shape. After performing the spacer formation and junction formation on both the memory cell region and the high-voltage device region, spacer formation and junction formation is performed on a low-voltage device region in the periphery section. The correct function of inversion is tested during all three steps by measuring the direction of the current flow. In addition, a gap between the attachment walls of the first and second arms is larger than an outer wall height of the adjacent electrical device mounting box.