Analysis of changes in the scoliotic spine using a three-dimensional radiographic technique

Hindmarsh, James; Larsson, Jan; Mattsson, Ove

doi:10.1016/0021-9290(80)90370-x

Cited by 29 publications

(8 citation statements)

References 7 publications

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“…The 3D reconstruction of the spine in upright posture can be obtained by stereo-radiographic or bi-planar radiographic methods, developed since the 1970s [10,13,15,20,33,35,48,53,61]. The principle is to identify 4-25 anatomical landmarks per vertebrae, in two (or more) calibrated radiographs and to compute their 3D positions using algorithms such as DLT [13,48] or Non Stereo Corresponding Points [43].…”

Section: Introductionmentioning

confidence: 99%

A semi-automated method using interpolation and optimisation for the 3D reconstruction of the spine from bi-planar radiography: a precision and accuracy study

Dumas

Blanchard²,

Carlier

et al. 2007

Med Bio Eng Comput

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The 3D reconstruction of the spine in upright posture can be obtained by bi-planar radiographic methods, developed since the 1970s. The principle is to identify 4-25 anatomical landmarks per vertebrae and per images. This identification time is hardly manageable in clinical practice. A semi-automated method is used: 3D standard vertebral models are positioned along with a 3D curve (identified all the way through the vertebral bodies). The silhouettes of the models of C7 and L5 vertebrae are first adjusted and the positions of the other vertebrae are interpolated and optimised. The inter- and intra-operator variabilities and the errors between the semi-automated method and the manual identification of six anatomical landmarks per vertebra are evaluated on 20 pairs of X-ray images of subjects with different spinal deformities. The identification time for the semi-automated method is 5 min. For scolitic subjects, the precision is under 2.2 degrees and the accuracy is under 3.2 degrees for all lateral, sagittal and axial rotations.

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Section: Introductionmentioning

confidence: 99%

A semi-automated method using interpolation and optimisation for the 3D reconstruction of the spine from bi-planar radiography: a precision and accuracy study

Dumas

Blanchard²,

Carlier

et al. 2007

Med Bio Eng Comput

View full text Add to dashboard Cite

show abstract

“…Enfin, la mé-thode « rapide » proposée remplit bien l'objectif imparti de rapidité, puisque les temps d'identification des points le long de la colonne, évalués à 7,5 et 10 minutes pour les vues frontales et latérales respectivement, sont très inférieurs aux deux heures indispensables au traitement de ces radiographies par la méthode « standard ». Le temps octroyé ici est donc du même ordre que les 15 minutes employées à l'identification des points par la méthode de Godillon et al [13], mais très inférieur à celui rapporté par Hindmarsh et al [15] (1 heure 30 minutes). De plus, les temps mesurés dans la présente étude devraient être divisés par un facteur deux ou trois avec l'entraînement de l'utilisateur, l'incorporation de filtres d'image permettant une meilleure visualisation des repères anatomiques sur les radiographies par variation de contraste notamment, l'optimisation du programme et le passage du logiciel de programmation Matlab au langage C++.…”

Section: Discussionunclassified

“…Pour ce faire, plusieurs techniques informatiques de reconstruction 3D ont été proposées [4,[6][7][8][9][10][11][12][13][14][15][16][17][18]. Parmi celles-ci, une approche, (ici nommée, méthode « standard ») est utilisée de routine afin de caractériser en 3D les déformations des patients atteints de scoliose idiopathique de l'adolescence à l'hôpital Sainte-Justine (Montréal, Canada) [6][7][8][9]18].…”

Section: Introductionunclassified

Évaluation d'une méthode clinique d'acquisition rapide de la géométrie 3D de colonnes vertébrales scoliotiques

et al. 2004

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“…Brown et al [4] used a similar technique for spine reconstruction, positioning the X-ray sources for sequential frontal and lateral views. Hindmarsh et al [17] used two antero-posterior radiographs (0°and 10°angled down), the patient's position being maintained by tapes at the shoulders and pelvis. Stokes et al [28] developed a stereo-radiographic technique comprising postero-anterior (PA) and oblique planes (rotation of 15°about the projection axis).…”

Section: Introductionmentioning

confidence: 99%

“…Other approaches using the frontal and lateral (LAT) views were also developed for the spine [2,9,11,15]. All these techniques involve the identification and matching of anatomical landmarks on pairs of radiographs, which are then reconstructed in 3D using one of many possible methods: triangulation based [4,19]; stereoscopic [16,17]; Direct Linear Transformation [9,10]. The average error of these reconstruction methods is on the order of a few millimetres (2.1-4.7 mm), depending on the nature of the reconstructed landmark (some are more accurately identified than others) [9,19].…”

Section: Introductionmentioning

confidence: 99%

A versatile 3D reconstruction system of the spine and pelvis for clinical assessment of spinal deformities

et al. 2007

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This paper presents a three-dimensional (3D) reconstruction system of the human spine for the routine evaluation of musculoskeletal pathologies like idiopathic scoliosis. The main objective of this 3D reconstruction system is to offer a versatile and robust tool for the 3D analysis of spines in any healthcare centre with standard clinical setup using standard uncalibrated radiographic images. The novel system uses a self-calibration algorithm and a weak-perspective method to reconstruct the 3D coordinates of anatomical landmarks from bi-planar radiographic images of a patient's trunk. Additionally, a small planar object of known dimensions is proposed to warrant an accurately scaled model of the spine. In order to assess the validity of the 3D reconstructions yielded by the proposed system, a clinical study using 60 pairs of digitized X-rays of adolescents was conducted. The subject cohort in the study group was composed of 51 scoliotic and 9 non-scoliotic patients, with an average Cobb angle on the frontal plane of 25 degrees. For each case, a 3D reconstruction of the spine and pelvis was obtained with the previous system used at our hospital (which requires a positioning apparatus and a calibration jacket), and with the proposed method. Results show that 3D reconstructions obtained with the new system using uncalibrated X-ray images yield geometrically accurate models with insignificant differences for 2D and 3D clinical indexes commonly used in the evaluation of spinal deformities. This demonstrates the system to be a viable and accurate tool for clinical studies and biomechanical analysis purposes, with the added advantage of versatility to any clinical setup for routine follow-ups and surgical planning.

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Analysis of changes in the scoliotic spine using a three-dimensional radiographic technique

Cited by 29 publications

References 7 publications

A semi-automated method using interpolation and optimisation for the 3D reconstruction of the spine from bi-planar radiography: a precision and accuracy study

A semi-automated method using interpolation and optimisation for the 3D reconstruction of the spine from bi-planar radiography: a precision and accuracy study

Évaluation d'une méthode clinique d'acquisition rapide de la géométrie 3D de colonnes vertébrales scoliotiques

A versatile 3D reconstruction system of the spine and pelvis for clinical assessment of spinal deformities

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