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5 September 2014THz optical design considerations and optimization for medical imaging applications
THz imaging system design will play an important role making possible imaging of targets with arbitrary properties
and geometries. This study discusses design consideration and imaging performance optimization techniques in THz
quasioptical imaging system optics. Analysis of field and polarization distortion by off-axis parabolic (OAP) mirrors
in THz imaging optics shows how distortions are carried in a series of mirrors while guiding the THz beam. While
distortions of the beam profile by individual mirrors are not significant, these effects are compounded by a series of
mirrors in antisymmetric orientation. It is shown that symmetric orientation of the OAP mirror effectively cancels this
distortion to recover the original beam profile. Additionally, symmetric orientation can correct for some geometrical
off-focusing due to misalignment. We also demonstrate an alternative method to test for overall system optics
alignment by investigating the imaging performance of the tilted target plane. Asymmetric signal profile as a function
of the target plane’s tilt angle indicates when one or more imaging components are misaligned, giving a preferred tilt
direction. Such analysis can offer additional insight into often elusive source device misalignment at an integrated
system. Imaging plane tilting characteristics are representative of a 3-D modulation transfer function of the imaging
system. A symmetric tilted plane is preferred to optimize imaging performance.
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Shijun Sung, James Garritano, Neha Bajwa, Bryan Nowroozi, Nuria Llombart, Warren Grundfest, Zachary D. Taylor, "THz optical design considerations and optimization for medical imaging applications," Proc. SPIE 9199, Terahertz Emitters, Receivers, and Applications V, 91990S (5 September 2014); https://doi.org/10.1117/12.2062403