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This article presents a method for automatic segmentation of prostate from abdominal freehand ultrasound images. A statistical model of prostate is estimated from a manually delineated images. The segmentation starts by smoothing the image to enhance edges by applying a morphological and adaptive filter which detects individual speckles and remove them, while it preserves valuable details. Then the boundary is initialised starting from the model and the final form is estimated by a simulated annealing optimisation algorithm. The performances of the algorithm were compared with manual segmentation by an expert, the average distance was 3.7 pixels and an overlap surface of 93%. 相似文献
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Segmentation of abdominal ultrasound images of the prostate using a priori information and an adapted noise filter. 总被引:2,自引:0,他引:2
Nacim Betrouni Maximilien Vermandel David Pasquier Salah Maouche Jean Rousseau 《Computerized medical imaging and graphics》2005,29(1):43-51
This article discusses a method for the automatic segmentation of trans-abdominal ultrasound images of the prostate. Segmentation begins with the application of a filter to enhance the contours without modifying the image information. It combines adaptive morphological filtering and median filtering to detect the noise-containing regions and smooth them. A heuristic optimization algorithm searches for the contour initialized from a prostate model. The performance of the algorithm was tested by comparing the resulting contours with those obtained by manual segmentation. The average distance between the contours was 2.5 mm and the average coverage index was 93%. 相似文献
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Colin P Estevez JP Betrouni N Nevoux P Puech P Leroy X Biserte J Villers A Mordon S 《Bulletin du cancer》2011,98(7):769-778
PurposePhotodynamic therapy (PDT) is an innovative therapeutic modality in urologic oncology.Material and methodsWe reviewed the current literature on principles and modalities of PDT in urothelial and penile oncology.ResultsPDT has been tested for the treatment recurrent superficial bladder tumors and in situ carcinoma. Carcinologic efficacy has been observed with first generation photosensitizer. The lack of selectivity for tumoral cells was responsible of serious adverse events. Development of selective photosensitizers has reduced the importance of side effects. Data concerning PDT for upper urinary tract urethra and carcinoma are still limited.ConclusionFirst PDT clinical applications in urothelial oncology have shown some effectiveness at the cost of significant morbidity. The development of selective photosensitizers should help to reduce side effects. 相似文献
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Thomas Cazaentre Franck Morschhauser Maximilien Vermandel Nacim Betrouni Thierry Prangère Marc Steinling Damien Huglo 《European journal of nuclear medicine and molecular imaging》2010,37(3):494-504
Purpose
Radioimmunotherapy (RIT) is a new treatment option for patients with non-Hodgkin lymphoma (NHL). Response to RIT currently remains difficult to predict using conventional prognostic factors and could be refined using functional imaging. The goal of this work is to evaluate the value of 18F-fluorodeoxyglucose (FDG) positron emission tomography (PET) in predicting response to Yttrium 90-labeled monoclonal antibodies for patients with NHL. 相似文献5.
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Ga?l?Pages Nacim?Ramdani Philippe?Fraisse David?Guiraud 《Medical & biological engineering & computing》2009,47(6):625-633
This paper presents a contribution for restoring standing in paraplegia while using functional electrical stimulation (FES).
Movement generation induced by FES remains mostly open looped and stimulus intensities are tuned empirically. To design an
efficient closed-loop control, a preliminary study has been carried out to investigate the relationship between body posture
and voluntary upper body movements. A methodology is proposed to estimate body posture in the sagittal plane using force measurements
exerted on supporting handles during standing. This is done by setting up constraints related to the geometric equations of
a two-dimensional closed chain model and the hand–handle interactions. All measured quantities are subject to an uncertainty
assumed unknown but bounded. The set membership estimation problem is solved via interval analysis. Guaranteed uncertainty
bounds are computed for the estimated postures. In order to test the feasibility of our methodology, experiments were carried
out with complete spinal cord injured patients.
相似文献
David Guiraud (Corresponding author)Email: |
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O. Chilali P. Puech S. Lakroum M. Diaf S. Mordon N. Betrouni 《Journal of digital imaging》2016,29(6):730-736
For many years, prostate segmentation on MR images concerned only the extraction of the entire gland. Currently, in the focal treatment era, there is a continuously increasing need for the separation of the different parts of the organ. In this paper, we propose an automatic segmentation method based on the use of T2W images and atlas images to segment the prostate and to isolate the peripheral and transition zones. The algorithm consists of two stages. First, the target image is registered with each zonal atlas image then the segmentation is obtained by the application of an evidential C-Means clustering. The method was evaluated on a representative and multi-centric image base and yielded mean Dice accuracy values of 0.81, 0.70, and 0.62 for the prostate, the transition zone, and peripheral zone, respectively. 相似文献
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Vincent M. Borderie Cristina Georgeon Marie Borderie Nacim Bouheraoua Olivier Touzeau Laurent Laroche 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2014,252(3):449-456