Abstract: An electronic device is provided. The electronic device includes an antenna array including a plurality of antenna patterns collectively configured to provide a scan-angle coverage. Each of the antenna patterns includes a curved surface.

Abstract: Techniques include receiving a treatment plan for a subject, including a body outline, a position on a couch, and, for each gantry angle, a couch angle an isocenter and target volumes to which a radiation source is directed. A perspective transform matrix is based on projected coordinates of reference points from a digital image projector onto each different plane perpendicular to a beam from the radiation source at different distances. Two-dimensional spot positions for a gantry and couch angle are determined based on the treatment plan. A group of spot positions are determined based on a common distance from the radiation source to the body outline. Illuminated spots on a projection image are determined based on the group and the perspective transform matrix closest to the common distance. The projection image is projected from the image projector onto the subject on the couch.