A hinge mechanism comprises first and second chock plates and an adjustable shaft. A weighting function is applied to image data for each gradient echo such as MR data or magnitude images associated with each gradient echo. The second stacked unit includes third and fourth ferromagnetic layers and a second nonmagnetic layer provided therebetween. The photodetector is in tight contact with the second light-emitting surface of the semiconductor laser chip. In an example embodiment, the electrically controllable RF-circuit element is configured to operate as a phase shifter whose phase-shifting characteristics can be changed using a dc-bias voltage applied to a multilayered structure containing a layer of the electrochromic material.