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6th Internet World Congress for Biomedical Sciences

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A low cost stereo vision system for vertebral column measures

Constantino F. Mugarra Gonzalez(1), Isaac Llorens i Eixea(2), Juan Gutierrez Aguado(3), Eva M. Perez Vidal(4)
(1)(2)(3)(4)Facultat de Fisica. Universitat de Valencia - Burjassot. Spain

[ABSTRACT] [INTRODUCTION] [MATERIAL & METHODS] [RESULTS] [IMAGES] [DISCUSSION] [CONCLUSIONS] [BIBLIOGRAPHY] [Discussion Board]
INTRODUCTION Previous: Therapeutic consultation automatized system. Previous: Intraarticular Synovial Sarcoma RESULTS
[Health Informatics]
Next: SUPPORT SYSTEM FOR DEAF CHILDREN TEACHING - ( SAECPS ) 		[Medical Electronics & Engineering]
Next: Active contours and medical imaging		 [Orthopedics & Traumatology]
Next: GENTAMICIN CONTAINING SURGICAL BONE CEMENT: IN VITRO ELUTION CHARACTERISTICS OF PALACOS® AND PALAMED® 		[Physical Therapeutics & Rehabilitation]
Next: SUPPORT SYSTEM FOR DEAF CHILDREN TEACHING - ( SAECPS )

MATERIAL & METHODS

The method proposed has no need of infrared beams or reflectors, hence reducing the complexity of the involved devices. Infrared light sensors are also very sensitive to changes on the reflection angle, leading to increasing problems when measuring dynamic images.

Visible light simplifies the patient preparation, and allows using non-invasive marks (self-adhesive white small labels). Marks are put over selected vertebras on the patient´s back (1), and light used is centred in violet for better image thresholding.

The system consists of two monochrome high-resolution TV cameras (non-interlaced Sony XC55) and a image acquisition card (Matrox Meteor II). Cameras are positioned in such a way that each one covers the whole patient´s back.

As a drawback, cameras need to be calibrated, a slow procedure that it is only needed once. If cameras are fixed it is not necessary to recalibrate them. The method chosen to calibrate is the one proposed by Tsai (2).

When these two images for stereo vision are taken they are thesholded and shrank to obtain the points that better represent the selected vertebras. From this moment on, working on images are not necessary because the image has been reduced to the relevant points, each one representing a vertebral position in each camera projection plane. Correspondence between pairs of points will allow calculating the vertebra positions in real world. In order to reconstruct a smooth vertebral column profile, the points obtained are represented by means of a cubic B-Spline curve. This curve has some desirable properties:

  • It belongs to C^2 space so it is easy to obtain its curvature and its inflection points.

  • It gives a smooth representation of data avoiding unwanted noise.

  • It allows measuring angles and lengths between data points.

Everything is integrated in a 3D digital environment in a personal computer, allowing medical professionals to develop functional studies and static measures related to possible deviations in vertebral columns. Becoming a useful method to discriminate if patient needs a more exhaustive study by means of invasive techniques.

Discussion Board
Discussion Board

Any Comment to this presentation?

[ABSTRACT] [INTRODUCTION] [MATERIAL & METHODS] [RESULTS] [IMAGES] [DISCUSSION] [CONCLUSIONS] [BIBLIOGRAPHY] [Discussion Board]
INTRODUCTION Previous: Therapeutic consultation automatized system. Previous: Intraarticular Synovial Sarcoma RESULTS
[Health Informatics]
Next: SUPPORT SYSTEM FOR DEAF CHILDREN TEACHING - ( SAECPS ) 		[Medical Electronics & Engineering]
Next: Active contours and medical imaging		 [Orthopedics & Traumatology]
Next: GENTAMICIN CONTAINING SURGICAL BONE CEMENT: IN VITRO ELUTION CHARACTERISTICS OF PALACOS® AND PALAMED® 		[Physical Therapeutics & Rehabilitation]
Next: SUPPORT SYSTEM FOR DEAF CHILDREN TEACHING - ( SAECPS )
Constantino F. Mugarra Gonzalez, Isaac Llorens i Eixea, Juan Gutierrez Aguado, Eva M. Perez Vidal
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Last update: 15/01/00