Int J Comput Assist Radiol Surg - Computer assisted determination of acetabular cup orientation using 2D-3D image registration.

Tópicos

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Resumo

CKGROUND: 2D-3D image-based registration methods have been developed to measure acetabular cup orientation after total hip arthroplasty (THA). These methods require registration of both the prosthesis and the CT images to 2D radiographs and compute implant position with respect to a reference. The application of these methods is limited in clinical practice due to two limitations: (1) the requirement of a computer-aided design (CAD) model of the prosthesis, which may be unavailable due to the proprietary concerns of the manufacturer, and (2) the requirement of either multiple radiographs or radiograph-specific calibration, usually unavailable for retrospective studies. In this paper, we propose a new method to address these limitations.METHODS: A new formulation for determination of post-operative cup orientation, which couples a radiographic measurement with 2D-3D image matching, was developed. In our formulation, the radiographic measurement can be obtained with known methods so that the challenge lies in the 2D-3D image matching. To solve this problem, a hybrid 2D-3D registration scheme combining a landmark-to-ray 2D-3D alignment with a robust intensity-based 2D-3D registration was used. The hybrid 2D-3D registration scheme allows computing both the post-operative cup orientation with respect to an anatomical reference and the pelvic tilt and rotation with respect to the X-ray imaging table/plate. The method was validated using 2D adult cadaver hips.RESULTS: Using the hybrid 2D-3D registration scheme, our method showed a mean accuracy of 1.0 +/- 0.7 degrees (range from 0.1 degrees to 2.0 degrees) for inclination and 1.7 +/- 1.2 degrees (range from 0.0 degrees to 3.9 degrees) for anteversion, taking the measurements from post-operative CT images as ground truths.CONCLUSIONS: Our new solution formulation and the hybrid 2D-3D registration scheme facilitate estimation of post-operative cup orientation and measurement of pelvic tilt and rotation.

Resumo Limpo

ckground dd imagebas registr method develop measur acetabular cup orient total hip arthroplasti tha method requir registr prosthesi ct imag d radiograph comput implant posit respect refer applic method limit clinic practic due two limit requir computeraid design cad model prosthesi may unavail due proprietari concern manufactur requir either multipl radiograph radiographspecif calibr usual unavail retrospect studi paper propos new method address limitationsmethod new formul determin postop cup orient coupl radiograph measur dd imag match develop formul radiograph measur can obtain known method challeng lie dd imag match solv problem hybrid dd registr scheme combin landmarktoray dd align robust intensitybas dd registr use hybrid dd registr scheme allow comput postop cup orient respect anatom refer pelvic tilt rotat respect xray imag tablepl method valid use d adult cadav hipsresult use hybrid dd registr scheme method show mean accuraci degre rang degre degre inclin degre rang degre degre antevers take measur postop ct imag ground truthsconclus new solut formul hybrid dd registr scheme facilit estim postop cup orient measur pelvic tilt rotat

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