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Estimation of out-of-plane vertebra rotations on radiographic projections using CT data: A simulation study

Estimation of out-of-plane vertebra rotations on radiographic projections using CT data: A simulation study
Estimation of out-of-plane vertebra rotations on radiographic projections using CT data: A simulation study
This study extends previous research concerning in vivo intervertebral motion by means of single-plane fluoroscopy in an attempt to overcome 2D analysis limitations. Knowledge of out-of-plane vertebra rotations will extend the results provided by planar kinematic studies, which is particularly important for lateral bending investigation where axial rotation accompanies side bending, but is also valuable in sagittal analysis (e.g. indicating an absence of coupled axial rotation). Combining a fluoroscopic projection of a vertebra with volumetric information provided by CT data, vertebra 3D position can be estimated. Out-of-plane vertebral rotations are estimated by comparing Digitally Reconstructed Radiographs (DRRs) in different orientations with a reference fluoroscopic projection, maximising the image cross-correlation index. DRRs have been computed from CT-data using a ray-casting algorithm. In this work a feasibility study of the method was performed by means of a computer simulation. To this end the CT volume (vertebra L4, segmented) provided by the Visible Human Project was utilised and reference fluoroscopic projections were simulated in different orientations adding various levels of noise. Accuracy and precision of the proposed method was determined. Error analysis reveals that an accuracy of less than 1 degree can be achieved in computation of out-of-plane vertebral angles.
spine kinematics, 3D pose estimation, digitally reconstructed radiograph (DRR)
1350-4533
295-300
Bifulco, Paolo
1e727d82-a929-469d-b0cf-af7c1e99b7cc
Sansone, Mario
a2ff70bc-6160-494e-b499-4cb248b5c1c2
Cesarelli, Mario
e120e865-e5a3-4c65-bf03-29d6c1a3352b
Allen, Robert
956a918f-278c-48ef-8e19-65aa463f199a
Bracale, Marcello
cc14905f-c294-480d-a64b-e657dcbb91f4
Bifulco, Paolo
1e727d82-a929-469d-b0cf-af7c1e99b7cc
Sansone, Mario
a2ff70bc-6160-494e-b499-4cb248b5c1c2
Cesarelli, Mario
e120e865-e5a3-4c65-bf03-29d6c1a3352b
Allen, Robert
956a918f-278c-48ef-8e19-65aa463f199a
Bracale, Marcello
cc14905f-c294-480d-a64b-e657dcbb91f4

Bifulco, Paolo, Sansone, Mario, Cesarelli, Mario, Allen, Robert and Bracale, Marcello (2002) Estimation of out-of-plane vertebra rotations on radiographic projections using CT data: A simulation study. Medical Engineering & Physics, 24 (4), 295-300. (doi:10.1016/S1350-4533(02)00021-8).

Record type: Article

Abstract

This study extends previous research concerning in vivo intervertebral motion by means of single-plane fluoroscopy in an attempt to overcome 2D analysis limitations. Knowledge of out-of-plane vertebra rotations will extend the results provided by planar kinematic studies, which is particularly important for lateral bending investigation where axial rotation accompanies side bending, but is also valuable in sagittal analysis (e.g. indicating an absence of coupled axial rotation). Combining a fluoroscopic projection of a vertebra with volumetric information provided by CT data, vertebra 3D position can be estimated. Out-of-plane vertebral rotations are estimated by comparing Digitally Reconstructed Radiographs (DRRs) in different orientations with a reference fluoroscopic projection, maximising the image cross-correlation index. DRRs have been computed from CT-data using a ray-casting algorithm. In this work a feasibility study of the method was performed by means of a computer simulation. To this end the CT volume (vertebra L4, segmented) provided by the Visible Human Project was utilised and reference fluoroscopic projections were simulated in different orientations adding various levels of noise. Accuracy and precision of the proposed method was determined. Error analysis reveals that an accuracy of less than 1 degree can be achieved in computation of out-of-plane vertebral angles.

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More information

Published date: 2002
Keywords: spine kinematics, 3D pose estimation, digitally reconstructed radiograph (DRR)

Identifiers

Local EPrints ID: 10879
URI: http://eprints.soton.ac.uk/id/eprint/10879
ISSN: 1350-4533
PURE UUID: d1542b2a-8644-4c2c-a937-948eb5d7926c

Catalogue record

Date deposited: 10 Feb 2006
Last modified: 15 Jul 2019 19:36

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