Abstract: A method, apparatus, and computer readable storage medium are provided herein for constructing a representation of an annular structure associated with an anatomical object. The method includes receiving three-dimensional image data of the anatomical object and detecting at least a first landmark point and a second landmark point on the annular structure. A plane positioned between the first landmark point and the second landmark point, and oriented in accordance with a predefined angular relationship to a line connecting the first landmark point and the second landmark point is determined. A third landmark point on the annular structure which lies in the plane is also detected and the representation of the annular structure is generated using at least the first landmark point, the second landmark point, and the third landmark point. The representation is then outputted.

Abstract: One aspect of the invention relates to a method of detecting a spatial orientation of a transducer by a handheld optical scanning device. The method comprises steps of providing a first spatial orientation feature on at least a first outer housing surface of the transducer and arranging a handheld optical scanning device in a sightline of the first spatial orientation feature at a selected spatial orientation relative to the first outer surface of the transducer housing. The method comprises further steps of identifying the first spatial orientation feature, detecting a spatial orientation of the handheld scanning device in a predetermined coordinate reference system and determining a spatial orientation of the transducer in the predetermined coordinate reference system.