1. A handheld apparatus for diagnosis of tissue, comprising: a housing, the housing further comprising: a) a light source; b) a micro-opto-electro-mechanical systems (MOEMS) rapid scanning delay line coupled to the light source; c) a quasi optics chopper coupled to the MOEMS rapid scanning delay line; d) a terahertz transmitter coupled to the quasi optics chopper; e) a first quasi optics system coupled to the transmitter, the first quasi optics system outputting light directed at a tissue sample; f) a second quasi optics system adapted to be optically coupled to the tissue sample, the second quasi optics system receiving light reflected from the tissue sample; g) a detector coupled to the second quasi optic system; h) a matching amplifier coupled to the detector; i) a sample stepper; and j) a control and display system coupled to the sample stepper, the matching amplifier, the transmitter, the quasi chopper and the scanner.