Abstract
Stereotactic systems have been used for decades to position surgical instruments in important preclinical and clinical studies. We developed and verified a low-cost magnetic-resonance-guided system for accurate preclinical stereotactic operations on small animals. The system consists of both commercially available and custom components, including in-house software written in MATLAB to register coordinate spaces. The software registers target the image-space coordinates from magnetic resonance imaging to the physical space through a rigid-body transform. The transform uses singular value decomposition to determine rotation and translation matrices that are optimal in a least squares sense. Needle positioning and core biopsy studies were performed to verify the accuracy of the system. The needle positioning study demonstrated a sub-millimeter positioning error of 0.294 ± 0.156 mm while using a 26 s gauge Hamilton needle. Biopsy studies demonstrated >94 % success in accessing sub-millimeter stereotactic targets embedded in agarose gel phantoms. These favorable results confirm that despite its relatively low hardware cost (US$18,730) and easy assembly, the system is able to consistently access stereotactic targets on the spatial scale of a small animal.
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This work was supported by the National Science Foundation Graduate Research Fellowship Program under grant DGE-1311230 (JDP), by the National Institutes of Health (NIH) - National Institute of Neurological Disorders and Stroke (NINDS) NS082609 (LSH), by the Mayo Clinic Foundation (LSH), and by the ASU-Mayo Clinic Arizona Seed Grant Program (DHF and KMB).
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Plasencia, J.D., Hu, L.S., Turner, G.H. et al. Design and Verification of Novel Low-Cost MR-Guided Small-Animal Stereotactic System. J. Med. Biol. Eng. 36, 526–535 (2016). https://doi.org/10.1007/s40846-016-0153-9
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DOI: https://doi.org/10.1007/s40846-016-0153-9