A memory system includes an array of solid-state memory devices are in communication with and under the control of a controller module via a device bus with very few lines. Also included are an imaging agent comprising a compound of Formula I complexed to 99mTc and their method of use to image a subject having a target site using single photon emission computed tomography. Upon initialization of the memory system, boot code stored in the memory controller is executed by its microprocessor to reference the address map and load one copy of the firmware from the flash memory into a controller memory, from which it may then be executed by the microprocessor to operate the memory system to store and retrieve user data.