r-viard - Publications List


Journal articles

2007	M Vanhoutte, R Viard, M Vermandel, A S Dewalle, N Betrouni, J Rousseau (2007) Characterization and correction of geometric distortion in 0.2 T MR Images Soumis à Concept in Magnetic Resonance en août 2007 Abstract: Notes:
	R Viard, P Tourneux, L Storme, J M Girard, N Betrouni, J Rousseau (2007) MRI spatial and time study of lung water clearance in newborn lamb : Methods and preliminary results. Soumis à Investigative radiology en Juin 2007 Abstract: Notes:
	R Viard, B Piron, A Steiner, B Wassmer, J Rousseau, S Mordon (2007) Temperature monitoring in laser-induced interstitial thermal therapy (LITT) using a low-field MRI : Determination of the lesion size in ex-vivo pig liver. Soumis à International Journal of Computer Assisted Radiology and Surgery en août 2007 Abstract: Notes:
	R Viard, J Rousseau (2007) Imagerie Interventionnelle par Résonance Magntique : Etat de l'art des développements techniques Journal francais de radiologie Abstract: Notes:
2005	DOI N Betrouni, M Vermandel, D Pasquier, R Viard, S Maouche (2005) Reduction de speckle et modelisation pour la segmentation d'images echographiques de la prostate ITBM-RBM 26: 4. 276-278 09 Abstract: This article discusses a method for automatic prostate segmentation from abdominal ultrasound images. A statistical model of prostate is estimated from training set of manually delineated images. The segmentation starts by smoothing the image to enhance edges by applying a special filter designed for abdominal ultrasound images of prostate. It detects individual speckles and removes them, while it preserves valuable details. Then the boundary is initialised starting from the model and an heuristic optimisation scheme is applied to guide the search of the final form. The performances of the algorithm were compared with manual segmentation, the average contour distance was 2.0 mm and the coverage index was about 93%. Notes:
Book chapters

2003	C Serruys, A Giron, R Viard, A Triller, B Fertil (2003) Une approche unifie pour discriminer les tumeurs noires de la peau. Revue des Nouvelles Technologies de l'Information 273-282 Abstract: Notes:
Conference papers

2007	R Viard, M Vermandel, P Tourneux, L Storme, J Rousseau (2007) Lung liquid clearance in newborn lamb: MRI methods and preliminary results In: Engineering in Medicine and Biology Society, EMBS. 29th Annual International Conference of the IEEE Abstract: Notes:
	R Viard, B Wassmer, S Mordon, X Marchandise, J Rousseau (2007) Estimation par IRM de la taille de la nécrose produite lors d'une thermothérapie laser ex-vivo dans du foie de porc In: Journée de Recherche en Imagerie Médicale Abstract: Notes:
	R Viard, N Betrouni, J Rousseau, S Mordon, O Ernst, S Maouche (2007) Needle positioning in interventional MRI procedure: real time optical localisation and accordance with the roadmap. In: Engineering in Medicine and Biology Society, EMBS.29th Annual International Conference of the IEEE Abstract: Notes:
	R Viard, A Steiner, B Piron, Ph Rochon, B Wassmer, S Mordon (2007) DETERMINATION OF THE LESION SIZE IN LASER-INDUCED INTERSTITIAL THERMAL THERAPY (LITT) USING A LOWFIELD MRI. In: Engineering in Medicine and Biology Society, EMBS.29th Annual International Conference of the IEEE Abstract: Notes:
	B Wassmer, R Viard, Ph Rochon, J Zemmouri, J Rousseau, S Mordon (2007) Modelisation of laser-tissu interaction for the treatment of liver tumor In: Comsol conference Abstract: Notes:

	R Viard, M Vermandel, P Tourneux, X Marchandise, L Storme, J Rousseau (2007) Etude IRM du contenu aqueux pulmonaire chez l'agneau nouveau-né In: Journée de Recherche en Imagerie Médicale Abstract: Notes:
	DOI N Betrouni, D Pasquier, M Vermandel, R Viard, P Dubois, Ph Puech (2007) Automatic 3D segmentation of pelvic structures for prostate cancer radiotherapy planning In: International Journal of Computer Assisted Radiology and Surgery Volume 2, Supplement 1 445-478 Abstract: Notes:
	DOI R Viard, B Piron, A Steiner, B Wassmer, J Rousseau, S Mordon (2007) Laser-induced interstitial thermal therapy: correlation between lesion size and temperature mapping using low-field MRI. In: Lasers in Surgery and Medicine 46-50 Abstract: Background and Objectives: The introduction of open MRI systems has made possible the use of reproducible thermosensitive sequences in order to determine the temperature distribution inside biological tissue. This study aimed to perform thermal mapping during Laser-induced Interstitial Thermal Therapy (LITT) when using this technique. Study Design/Materials and Methods: Laser irradiation was performed with a 980nm laser (Pharaon, Osyris France) in porcine liver ex-vivo in a low-field open scanner (Hitachi Airis 0.2 T). The laser light was transmitted through a 1040 Î¼m (outer diameter) bare-tip silica fibre. The laser energy was applied on an intermittent mode (10 s laser-on, 10 s laser-off) for 12 minutes, power: 6W, energy: 2360 J. MR-T1 method was used for its simplicity and its efficiency at low magnetic field. Gradient-echo images acquired during laser irradiation were used for real-time temperature mapping. The method was then validated by a comparison between calculated isotherm and macroscopic lesion size. Results: Images of sufficient quality were obtained with a mean SNR of 50.0. Temperature accuracy was 2.2 Â°C, temporal resolution was 20 sec. and spatial resolution was 2.52.52.5 mm3. Coagulation necrosis was observed in all laser-irradiated zones. Volumes calculated from isotherms were correlated (r2=0.64 p<0.05) to lesion size determined from macroscopic measurement Conclusion: Using fast gradient-echo sequence, laser monitoring is achieved efficiently with a fast temperature mapping. Using T1-weighted images appears promising for a monitoring of lesion size evolution in future low magnetic filed in-vivo studies. Notes:
	DOI N Betrouni, D Pasquier, M Vermandel, R Viard, P Dubois, Ph Puech (2007) New simple procedure for spatial calibration of freehand ultrasound machine In: International Journal of Computer Assisted Radiology and Surgery Volume 2, Supplement 1 2-42 Abstract: Notes:
	DOI R Viard, S Mordon, N Betrouni, M Vermandel, R Lopes, S Maouche (2007) Positioning of rigid surgical tools in interventional MRI assisted by stereovision: accordance with the road map In: International Journal of Computer Assisted Radiology and Surgery Volume 2, Supplement 1 483-507 Abstract: Notes:
2006	C Rubod, M Boukerrou, J Rousseau, R Viard, M Brieu, P Dubois (2006) A biomechanical model of the pelvic cavity : first steps In: Engineering in Medicine and Biology Society, 2006.EMBS'06.28th Annual International Conference of the IEEE 968-971 Abstract: Notes:
2003	C Serruys, A Giron, R Viard, A Triller, B Fertil (2003) Une approche unifie pour discriminer les tumeurs noires de la peau. In: 35èmes journées de statistiques 839-842 Abstract: Notes:

Journal articles

Book chapters

Conference papers