Reconstructing an image from MRI data provided by an MRI machine includes: selecting a system transformation based on the MRI machine; selecting a subspace based on the system transformation; and obtaining a solution vector that solves a minimization problem. An oscillating surface on a wall of the chamber imparts a rapid pressure fluctuation in the static pressure level of the chamber. 56 wherein the polymerizable resin composition comprises a fluorene-containing monomer. In the process of the microphone arm rotating from an opening status to a closing status, the elastic slice member contacts the supporting pillar and rotates around the supporting pillar.