Embodiments of the present description provide a medical apparatus for use in supporting a patient lying in a supine position during a radial cardiac catheterization procedure. The intermediate product is substantially rod shaped and is sized in a range that includes between one and two times as oriented strand chips. The result is a rolled planar antenna having a height and diameter predetermined to provide optimum VSWR for a given frequency range. Next, an arithmetic operation is performed using the 49 sets of three-dimensional coordinate data to ascertain an in-shot focus plane.