A nuclear imaging apparatus includes a radiation detector comprising an array of solid state detector elements responsive to incident gamma radiation by emitting a current spike. In some embodiments, the level shifting circuit includes a clocked level shifter. The processor uses the branch outcome queue and not the branch predictor to predict the outcomes of branch instructions in the second program thread. The flexible base material can be applied to flexible image-displaying devices. This enables the display of diversified game contents using multi-windows in a 3D game and maintains a balance between the display of the game content itself and the GUI while maintaining the GUI operability.