A method for growing a crystalline layer that includes a first material on a growth surface of a crystalline substrate of a second material, wherein the first material and the second material have different lattice constants. The bicycle comprises manually operable pedals fixed for rotation with a pedal spindle for receiving a manually provided driving force and a motor having a shaft for receiving a motor provided driving force. These approaches produce accurate in vivo one-dimensional velocity estimates in half the scan time compared with conventional balanced SSFP phase-contrast methods.