A fuel cell system and an operation method thereof are provided, which are capable of properly executing special shutdown of the fuel cell system in the event of a trouble in purge operation by use of material gas. The pitching movement frame 405 supports a third lens group G3 included in an optical system for performing image blur correction. The computation instruction for a node includes a descriptor of the operation performed at the node and a descriptor of each instruction that produces an input to the node. The mechanical support may further include an isolation structure that isolates the feedthrough wires. A method includes generating a model which models a quality of fmdings in radiologist reports as a function of deposited dose of scans from which the radiologist reports are created and determining an optimal dose value for a planned scan based on the model and one or more optimization rules.