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加拿大 北方數字,Northern Digital ,  
加拿大北方數字公司(Northern Digital Inc)生產醫療以及工業行業所使用的光學及電磁測量系統，這些產品被用于計算機輔助的手術及治療，以及影像導引的輻射治療，此外還被用于光學跟蹤和3D測量。

北方數字總部位于安大略省的滑鐵盧，

NDI specializes in the design, manufacture and sale of advanced spatial measurement systems. Recognized as a global leader in the field, NDI provides solutions of the highest quality, accuracy and reliability. The technology makes possible some of the most advanced medical, industrial and life sciences applications in the world today. In fields as diverse as computer-assisted therapy, motion capture for sports, industrial reverse engineering and motion-measurement biomechanics research, NDI systems are internationally trusted as the technology of choice.
Specialties
motion capture for research, coordinate measurement machines, spatial measurement, reverse engineering, medical navigation, biomechanics, portable CMM, 3D laser scanning, metrology, sterile spheres for Image Guided Surgery (IGS), computer assited therapy