3D reconstruction of the spine from biplanar X-rays using parametric models based on transversal and longitudinal inferences

Humbert, Ludovic; Guise, Jacques A. de; Aubert, B.; Godbout, B.; Skalli, Wafa

doi:10.1016/j.medengphy.2009.01.003

Cited by 322 publications

(271 citation statements)

References 27 publications

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“…23 girls and 7 boys were included. The mean age at radiological examination was 11 [range [8][9][10][11][12][13][14]. 10 were classified Risser 0 or 1, 7 were Risser 2, 8 were Risser 3 and 5 were Risser 4.…”

Section: Imaging Protocol and 3d Modelingmentioning

confidence: 99%

“…This low dose imaging system provides simultaneous AP and lateral views in the standing position. Computerized reconstructions based on identifiable anatomic points provide a 3D image of the entire spine which offers a novel approach to the scoliotic deformity giving measurements of vertebral and intervertebral axial rotation [11]. The imaging protocol was approved by our national ethics committee (CCPPRB 6001).…”

Section: Imaging Protocol and 3d Modelingmentioning

confidence: 99%

“…3D shape parameters were automatically computed in Stereos [11]. The parameters computed were as follows:…”

Section: Imaging Protocol and 3d Modelingmentioning

confidence: 99%

“…These methods of 3D reconstruction of the spine have been validated in asymptomatic and scoliotic patients [10][11][12][13]. The purpose of the current study was to analyze the variability of the effect of brace treatment on the 3D shape of idiopathic scoliosis.…”

Section: Introductionmentioning

confidence: 99%

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3D analysis of brace treatment in idiopathic scoliosis

et al. 2013

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Purpose We have evaluated the effect of bracing in scoliosis on coronal alignment in a cohort of patients. Current literature has not described the specific effect of bracing on the 3D shape of the scoliotic curves. The purpose of this study was to analyze the variability of the 3D effect of bracing on idiopathic scoliosis. Materials and methods The spines of 30 patients with adolescent idiopathic scoliosis were reconstructed using biplanar stereoradiography with and without the brace. The Cobb angle, sagittal and pelvic parameters and transverse plane parameters were calculated. The variability and the mean values of each parameter, with and without a brace, were analyzed and compared using a student t test. Results The Cobb angle improved in 50 % of patients but remained unchanged in 50 % cases. In 90 % of the cases lordosis was decreased. The thoracic kyphosis was decreased in 26 % cases, unchanged in 57 % of cases and increased in 17 % cases. The AVR was improved ([5°) in 26 % cases, worsened in 23 % and unchanged in 50 %. Only the differences of Cobb angle and the lordosis were statistically significant.Conclusions Global statistics of this study concur with the literature. The Cobb angle was significantly improved. It also showed a significant hypolordotic effect. However, the results showed a high variability of the brace treatment effect in almost every parameter. Analysis of this variability by means of 3D reconstructions instead of global statistics should help characterize the mechanisms of correction of brace treatment.

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Section: Imaging Protocol and 3d Modelingmentioning

confidence: 99%

Section: Imaging Protocol and 3d Modelingmentioning

confidence: 99%

“…3D shape parameters were automatically computed in Stereos [11]. The parameters computed were as follows:…”

Section: Imaging Protocol and 3d Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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3D analysis of brace treatment in idiopathic scoliosis

et al. 2013

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“…However, this technique fails in the description of 3D orientation of the planes of regional curves [4]. Many techniques were developed to overcome this problem by the help of appropriate image analysis algorithms [5,6]. In these studies, however, mean thoracic kyphosis angles of the subjects under investigation were rather normal ([30°) and no metal hardware was implanted.…”

Section: Discussionmentioning

confidence: 99%

The assessment of the postoperative spinal alignment: MRI adds up on accuracy

et al. 2011

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Introduction The sagittal profile of conventionally and surgically treated scoliotic spines is usually analyzed via lateral views of whole-spine X-rays in an upright position. Due to a more hypokyphotic configuration of scoliotic spines, the view onto the upper thoracic vertebrae is often difficult. We investigated whether additional supine MRI measurement supports valid kyphosis angle measurement. Patients and methods Twenty patients with either short (n = 10, Halm-Zielke, VDS) or long spondylodesis (n = 10, dorsoventral) were assessed 5 years after surgery with standing radiographs and supine whole-spine MRI. Results Up to 90% of the upper thoracic vertebrae were invisible on radiographs, whereas MRI allowed visibility of almost many vertebrae. No significant difference in thoracal kyphosis angles could be observed in the comparison of X-ray and MRI data. Conclusion Thoracal kyphosis measurement of postoperative spines in MRI is a valid diagnostic tool with reliability comparable to that of X-ray. These results cannot be transferred to lumbar lordosis measurement and transferred only partly to coronal COBB angle measurement.

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Hough transform‐based approach for estimating 3D rotation angles of vertebrae from biplanar radiographs using GPU‐acceleration

Zhang

Shi

et al. 2013

Int J Imaging Syst Tech

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For scoliosis assessment, a system was developed to estimate the three‐dimensional (3D) rotation angles of vertebrae from biplanar radiographs. The proposed approach was based on the generalized Hough transform (GHT) technique to match the projected contours of the standard 3D primitive with vertebral edges detected in biplanar radiographs. A deformation tolerant matching strategy was proposed to extend the GHT for an inexact contour matching. The system was implemented on a graphics processing unit (GPU). Seventeen dry vertebral specimens were used to evaluate accuracy. Precision was tested by three operators on 181 vertebrae from radiographs of 15 patients. With GPU computing, the average estimation time was 10 s for a vertebra. Results showed that the 3D estimation error was less than 2.5° with the mean value of 1.6°. The intraoperator variability was within 1.6° and the interoperator variability was within 2.2°. These promising results indicate that the proposed system can help orthopedic surgeons measure the 3D vertebral rotation angles from two‐dimensional radiographs for better assessment of scoliosis. © 2013 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 23, 272–279, 2013

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3D reconstruction of the spine from biplanar X-rays using parametric models based on transversal and longitudinal inferences

Cited by 322 publications

References 27 publications

3D analysis of brace treatment in idiopathic scoliosis

3D analysis of brace treatment in idiopathic scoliosis

The assessment of the postoperative spinal alignment: MRI adds up on accuracy

Hough transform‐based approach for estimating 3D rotation angles of vertebrae from biplanar radiographs using GPU‐acceleration

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