Int J Comput Assist Radiol Surg - Fully automatic extraction of human spine curve from MR images using methods of efficient intervertebral disk extraction and vertebra registration.


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RPOSE: A fully automatic method is proposed for extracting human spine curve which is required for gait modeling. By means of the gait modeling, origin of the gait pathology of patients could be found.METHODS: Our method is composed of two parts. The first part is the extraction of intervertebral disk positions where an efficient method is proposed. At the beginning of this part, all possible positions of intervertebral disks are located using a gradient-based method. Then, non-intervertebral disks are filtered out by a graph-based and an active shape model-based methods. In the second part, extracted disk positions are used by a vertebra registration method to segment spine vertebrae. Finally, spine curve is obtained by interpolating centers of segmented vertebrae using cubic spline.RESULTS: We tested our method with 13 MR data sets of patients. All disk positions of each MR data set were correctly extracted in the first part. The mean deviation of centers of segmented vertebrae that were obtained in the second part and used to interpolate spine curve was around 1.4 mm.CONCLUSIONS: Our method achieves a fully automatic extraction of the spine curve. The extraction of intervertebral disk positions in the first part of our method when compared to model-based methods and manual selection which were proposed in other papers is highly efficient. In the second part including the vertebra registration, a new similarity measurement method, which is used to guide the vertebra atlas fitting process, is proposed to solve the problem of changes in overlap. Through our experiment, results of spine curves are at a highly accurate level.

Resumo Limpo

rpose fulli automat method propos extract human spine curv requir gait model mean gait model origin gait patholog patient foundmethod method compos two part first part extract intervertebr disk posit effici method propos begin part possibl posit intervertebr disk locat use gradientbas method nonintervertebr disk filter graphbas activ shape modelbas method second part extract disk posit use vertebra registr method segment spine vertebra final spine curv obtain interpol center segment vertebra use cubic splineresult test method mr data set patient disk posit mr data set correct extract first part mean deviat center segment vertebra obtain second part use interpol spine curv around mmconclus method achiev fulli automat extract spine curv extract intervertebr disk posit first part method compar modelbas method manual select propos paper high effici second part includ vertebra registr new similar measur method use guid vertebra atlas fit process propos solv problem chang overlap experi result spine curv high accur level

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