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Anatomy Plane

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“Anatomy Plane” refers to a geometric plane in three-dimensional space associated with an anatomical region of interest. Examples include, without limitation, a plane approximating the level of selected anatomical structures (e.g., metatarsal heads), a plantar reference plane, a sagittal or coronal plane, or the like. An anatomy plane may be defined explicitly from landmarks, fitted to points or contours, or inferred from acquisition geometry including the positions and/or orientations of imaging emitters and sensors (e.g., X-ray source and detector, fluoroscope C-arm, camera or mobile-device camera), and may be modeled as coincident with, parallel to, or at a known or estimated offset from a detector plane or display plane. An anatomy plane may also be estimated computationally. As used herein, “at an anatomy plane” denotes that a measurement or calibration corresponds to the physical scale at that anatomical level; where the anatomy is not perfectly planar, the term includes a representative plane within an acceptable tolerance. In one embodiment, the anatomy plane is used for patient-plane calibration to compute a pixel-to-length conversion in millimeters per pixel.