A RF coil assembly for MRI comprising: - a first rigid frame; and - a flexible coil having a first end, a second end opposite the first end and a longitudinal axis extending from the first end to the second end, the flexible coil being in a naturally planar shape before the flexible coil is attached to the first rigid frame, wherein the first end is attached to the first rigid frame and the second end is away from the first rigid frame after assembly of the RF coil assembly is finished, wherein the first rigid frame is shaped to bend the flexible coil upon attaching the first end of the flexible coil to the first rigid frame to form a shape of the RF coil assembly which conforms to a shape of a region of a subject with multiple contours, wherein the flexible coil is bent into a curvature with multiple curve contours, wherein the first rigid frame is shaped to bend the flexible coil along a first bending axis parallel to the longitudinal axis and to further bend the flexible coil along a second bending axis perpendicular to the longitudinal axis when the first end of the flexible coil is attached to the first rigid frame and the bending along the first bending axis forms approximately a 180 degree bend, giving the initially planar flexible coil a substantially half tubular shape, and the bending along the second bending axis extends over a bending angle of the subject's outer surface's curvature determined in conformity to the shape of the region of the subject, wherein only a region of the flexible coil in proximity of the first end experiences the bending along the second bending axis, thereby forming a first bending region having a concave contour. - a first rigid frame; and - a flexible coil having a first end, a second end opposite the first end and a longitudinal axis extending from the first end to the second end, the flexible coil being in a naturally planar shape before the flexible coil is attached to the first rigid frame, wherein the first end is attached to the first rigid frame and the second end is away from the first rigid frame after assembly of the RF coil assembly is finished, wherein the first rigid frame is shaped to bend the flexible coil upon attaching the first end of the flexible coil to the first rigid frame to form a shape of the RF coil assembly which conforms to a shape of a region of a subject with multiple contours, wherein the flexible coil is bent into a curvature with multiple curve contours, wherein the first rigid frame is shaped to bend the flexible coil along a first bending axis parallel to the longitudinal axis and to further bend the flexible coil along a second bending axis perpendicular to the longitudinal axis when the first end of the flexible coil is attached to the first rigid frame and the bending along the first bending axis forms approximately a 180 degree bend, giving the initially planar flexible coil a substantially half tubular shape, and the bending along the second bending axis extends over a bending angle of the subject's outer surface's curvature determined in conformity to the shape of the region of the subject, wherein only a region of the flexible coil in proximity of the first end experiences the bending along the second bending axis, thereby forming a first bending region having a concave contour.