Automatic extraction of 3D anatomical feature curves of hip bone models reconstructed from CT images

Abstract

Abstract. 3D anatomical feature curves (AFC) on bone models reconstructed from CT/MRI images are important in some fields, such as preoperative planning, intra-operative navigation, patient-specific prosthesis design, etc. Interactive extraction of feature curves on patient-specific bone models is time-consuming, has low repeatability and accuracy. This paper presents a computer graphics method to automatically extract AFC from 3D hip bone models reconstructed from CT images. A DCSS (direct curvature scale space)-based technique is firstly used to extract anatomical feature points (AFP) in every contour, using anatomical structure information as prior knowledge so that AFP are extracted and only extracted. Then, corresponding AFP are linked in different contours and AFC is generated. AFC obtained by our method were compared with those interactively extracted by three surgeons, which showed that our method is feasible (Dice coefficient: 0.94; Average symmetric surface distance: 3.97 mm). The method was also applied to identify anatomical landmarks, which showed that our method is superior to the curvature-based methods that fail to identify landmark regions or have too many redundant regions, which results in failures to subsequently label landmark regions using pre-defined spatial adjacency matrices.

Three‐dimensional printing in orthopaedic preoperative planning improves intraoperative metrics: a systematic review

“…Case reports described similar results . The cases chosen were all complex, with the 3D printed model used to gain a more detailed appreciation of the relevant anatomy, planning the surgical approach and selecting instruments in advance.…”

“…When analysing the subjective data regarding the benefits of 3D models, there is a consistent trend that surgeons found 3D models useful when dealing with complicated anatomy . 3D printed 1:1 scale models allowed surgeons to appreciate the structure and relations of the relevant anatomy much better than the visualization provided by two‐dimensional (2D) CT images conventionally used today.…”

“…4 When analysing the subjective data regarding the benefits of 3D models, there is a consistent trend that surgeons found 3D models useful when dealing with complicated anatomy. 8,[17][18][19]21,25,26,37,40,42,50,[53][54][55][56] 3D printed 1:1 scale models allowed surgeons to appreciate the structure and relations of the relevant anatomy much better than the visualization provided by two-dimensional (2D) CT images conventionally used today. Inspection of these models also revealed structural abnormalities not appreciated on CT which altered the surgical approach in a significant number of cases.…”

3D printing in shoulder surgery

“…43 When analysing the subjective data regarding the benefits of 3D models, there is a consistent trend that surgeons found 3D models useful when dealing with complicated anatomy. [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58] 3D printed 1:1 scale models allowed surgeons to appreciate the structure and relations of the relevant anatomy much better than the visualization provided by bi-dimensional (2D) CT images conventionally used today. Inspection of these models also revealed structural abnormalities not appreciated on CT which altered the surgical approach in a significant number of cases.…”