how to get TOP-HAT TRANSFORM OF THE IMAGE with 12 rotating structuring elements and how to make it a single image for further processing ?

Morphological top-hat transformation is used for vessel elimination purpose. This operation is based on morphologically opening the image with a linear structuring element at different orientations. A total of 12 rotated structuring elements were used with a radial resolution of 15°. In each of the 12 opened images, only those parts of the vasculatures in which the linear structuring element can fit remain.

kindly mention how to code (for single rotaion) rotated structring element with radial resolution of 15degree