Int J Comput Assist Radiol Surg - Scaled, patient-specific 3D vertebral model reconstruction based on 2D lateral fluoroscopy.

Tópicos

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Resumo

CKGROUNDS: Accurate three-dimensional (3D) models of lumbar vertebrae are required for image-based 3D kinematics analysis. MRI or CT datasets are frequently used to derive 3D models but have the disadvantages that they are expensive, time-consuming or involving ionizing radiation (e.g., CT acquisition). An alternative method using 2D lateral fluoroscopy was developed.MATERIALS AND METHODS: A technique was developed to reconstruct a scaled 3D lumbar vertebral model from a single two-dimensional (2D) lateral fluoroscopic image and a statistical shape model of the lumbar vertebrae. Four cadaveric lumbar spine segments and two statistical shape models were used for testing. Reconstruction accuracy was determined by comparison of the surface models reconstructed from the single lateral fluoroscopic images to the ground truth data from 3D CT segmentation. For each case, two different surface-based registration techniques were used to recover the unknown scale factor, and the rigid transformation between the reconstructed surface model and the ground truth model before the differences between the two discrete surface models were computed.RESULTS: Successful reconstruction of scaled surface models was achieved for all test lumbar vertebrae based on single lateral fluoroscopic images. The mean reconstruction error was between 0.7 and 1.6 mm.CONCLUSIONS: A scaled, patient-specific surface model of the lumbar vertebra from a single lateral fluoroscopic image can be synthesized using the present approach. This new method for patient-specific 3D modeling has potential applications in spine kinematics analysis, surgical planning, and navigation.

Resumo Limpo

ckground accur threedimension d model lumbar vertebra requir imagebas d kinemat analysi mri ct dataset frequent use deriv d model disadvantag expens timeconsum involv ioniz radiat eg ct acquisit altern method use d later fluoroscopi developedmateri method techniqu develop reconstruct scale d lumbar vertebr model singl twodimension d later fluoroscop imag statist shape model lumbar vertebra four cadaver lumbar spine segment two statist shape model use test reconstruct accuraci determin comparison surfac model reconstruct singl later fluoroscop imag ground truth data d ct segment case two differ surfacebas registr techniqu use recov unknown scale factor rigid transform reconstruct surfac model ground truth model differ two discret surfac model computedresult success reconstruct scale surfac model achiev test lumbar vertebra base singl later fluoroscop imag mean reconstruct error mmconclus scale patientspecif surfac model lumbar vertebra singl later fluoroscop imag can synthes use present approach new method patientspecif d model potenti applic spine kinemat analysi surgic plan navig

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