Methods disclosed may include interrogating a subject (18) with millimeter-wave electromagnetic radiation, and generating data representative of a selected feature of a subject (18) may include serial comparative interrogating for processing. Serial processing may include first interrogating a given subject (18) at a first time, generating a data set from the first interrogating, second interrogating the subject (18) at a second time different than the first time, generating a data set from the second interrogating, and identifying information corresponding to a given feature of the subject (18) from each data set. Non-serial processing may include interrogating a subject (18), generating a data set from the interrogating, identifying information corresponding to a first feature of the subject (18), and identifying information corresponding to a second feature of the subject (18). Processing may also include comparing the information identified, and/or rendering representations (106) of the information identified and presenting the representations (106) rendered.
RELATIONAL MILLIMETER-WAVE INTERROGATING