[tag=DT] [□=□] □
[tag=DT] [tag=□] □
[tag=DT] [lemma=□] □
" The final 3-D model is a computerized reconstruction derived from a data set that included 93 electron diffraction patterns and 159 images culled from more than 4,000 images . A virtual reality interface allows the physician to position simulated beams through a semi-transparent 3-D model of the patient and to assess what beams pass through what organs . A general 3-d model has been developed to describe how the PO of a sample is manifested in intensity variations around the rings of a 2-d powder pattern , depending on the orientation of the PO axis with respect to the incident and diffracted beam directions .