Dr. Razvan Iordache Profile

Dr. Razvan Iordache

at GE Healthcare France

SPIE Involvement:

Author

Publications (19)

Proceedings Article | 13 July 2022 Paper

Lesion detection in contrast enhanced spectral mammography

Clément Jailin, Pablo Milioni, Zhijin Li, Răzvan Iordache, Serge Muller

Proceedings Volume 12286, 122860A (2022) https://doi.org/10.1117/12.2624577

KEYWORDS: Breast, Diagnostics, Data modeling, Mammography, Computer aided diagnosis and therapy, Cancer, Image classification

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Proceedings Article | 18 March 2015 Paper

Clinical image benefits after model-based reconstruction for low dose dedicated breast tomosynthesis

Eri Haneda, J. Eric Tkaczyk, Giovanni Palma, Răzvan Iordache, Serge Muller, Bruno De Man

Proceedings Volume 9412, 94120A (2015) https://doi.org/10.1117/12.2080970

KEYWORDS: Data modeling, Digital breast tomosynthesis, Breast, Model-based design, Sensors, Optical spheres, 3D modeling, Medical imaging, 3D image processing, Breast imaging

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Proceedings Article | 18 March 2015 Paper

Influence of DBT reconstruction algorithm on power law spectrum coefficient

Laurence Vancamberg, Ann-Katherine Carton, Ilyes Abderrahmane, Giovanni Palma, Pablo Milioni de Carvalho, Răzvan Iordache, Serge Muller

Proceedings Volume 9412, 941236 (2015) https://doi.org/10.1117/12.2081969

KEYWORDS: Reconstruction algorithms, Digital breast tomosynthesis, Breast, X-ray imaging, Error analysis, X-rays, Image filtering, Spatial frequencies, Signal to noise ratio, Mammography

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Proceedings Article | 17 March 2015 Paper

The effect of NPS calculation method on power-law coefficient estimation accuracy in breast texture modeling

Zhijin Li, Ann-Katherine Carton, Serge Muller, Răzvan Iordache, Agnès Desolneux

Proceedings Volume 9416, 94161I (2015) https://doi.org/10.1117/12.2081764

KEYWORDS: Breast, X-ray imaging, Error analysis, 3D image processing, Mathematical modeling, Image analysis, Numerical simulations, Digital breast tomosynthesis, Image processing, Convolution

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In breast X-ray imaging, breast texture has been characterized by a radial noise power spectrum (NPS) that has an inverse power-law shape with exponent β. The technique to estimate the radial power-law coefficient β is typically based on averaging 2-dimensional noise power spectra (NPS), calculated from partly overlapping image regions each weighted by a suitable window function. The linear regression applied over a selected frequency range to the logarithm of the 1- dimensional NPS as a function of the logarithm of the radial frequencies, gives β. For each step in this process, several alternative techniques have been proposed. This paper investigates the effect of image region of interest (ROI) size, image data windowing and alternative ways to determine radial frequency in terms of bias, variance and root mean square error (RMSE) in the estimated β. The effects of these three factors were analytically derived and evaluated using synthetic images with known β varying from 1 to 4 to cover the range of textures encountered in 2D and 3D breast X-ray imaging. Our results indicate that the RMSE in estimated β is smallest when the ROIs are multiplied with an appropriate window function and either no radial averaging or radial averaging with small frequency bins is applied. The ROI size yielding the smallest RMSE depends on several factors and needs to be validated with numerical simulations. In clinical practice however, there might be a need to compromise in the choice of the ROI size to balance between the RMSE magnitudes inherent to the applied β estimation technique and encompass the breast texture range so as to obtain an accurate shape of the NPS. When using 2.56 cm x 2.56 cm ROI sizes, applying a 2D Hann window and no radial frequency averaging, the RMSE in the estimated β ranges from 0.04 to 0.1 for true β values equal to 1 and 4. While many subtleties in real images were not modeled to simplify the mathematics in deriving our results, this work is illustrative in demonstrating the limits of commonly used algorithm steps to estimate accurate β values.

Proceedings Article | 19 March 2014 Paper

Toward a dose reduction strategy using model-based reconstruction with limited-angle tomosynthesis

Eri Haneda, J. Tkaczyk, Giovanni Palma, Răzvan Iordache, Scott Zelakiewicz, Serge Muller, Bruno De Man

Proceedings Volume 9033, 90330V (2014) https://doi.org/10.1117/12.2042897

KEYWORDS: Signal attenuation, Digital breast tomosynthesis, Sensors, Reconstruction algorithms, Optical spheres, Model-based design, Breast, Data modeling, Computed tomography, Tissues

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Proceedings Article | 11 March 2014 Paper

Detectability and image quality metrics based on robust statistics: following non-linear, noise-reduction filters

J. Eric Tkaczyk, Eri Haneda, Giovanni Palma, Razvan Iordache, Remy Klausz, Mathieu Garayt, Ann-Katherine Carton

Proceedings Volume 9037, 903711 (2014) https://doi.org/10.1117/12.2042922

KEYWORDS: Nonlinear filtering, Image filtering, Digital filtering, Image processing, Image quality, Linear filtering, Denoising, Gaussian filters, Statistical modeling, Signal to noise ratio

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Proceedings Article | 6 March 2013 Paper

Spectra optimization for dual-energy contrast-enhanced breast CT

Pablo Milioni de Carvalho, Ann-Katherine Carton, Sylvie Saab-Puong, Răzvan Iordache, Serge Muller

Proceedings Volume 8668, 86681Z (2013) https://doi.org/10.1117/12.2006911

KEYWORDS: Breast, Iodine, Tissues, Sensors, Monte Carlo methods, X-rays, Spatial resolution, Magnesium, Denoising, Spherical lenses

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Proceedings Article | 9 March 2012 Paper

Impact of image acquisition timing on image quality for dual energy contrast-enhanced breast tomosynthesis

Melissa Hill, James Mainprize, Sylvie Puong, Ann-Katherine Carton, Razvan Iordache, Serge Muller, Martin Yaffe

Proceedings Volume 8313, 831308 (2012) https://doi.org/10.1117/12.911627

KEYWORDS: Iodine, Reconstruction algorithms, Image quality, Breast, Image acquisition, X-rays, X-ray imaging, Mammography, Digital breast tomosynthesis, Image enhancement

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Proceedings Article | 16 March 2011 Paper

Effects of image lag and scatter for dual-energy contrast-enhanced digital breast tomosynthesis using a CsI flat-panel based system

Ann-Katherine Carton, Sylvie Puong, Razvan Iordache, Serge Muller

Proceedings Volume 7961, 79611D (2011) https://doi.org/10.1117/12.877941

KEYWORDS: Breast, X-rays, Sensors, Tissues, X-ray imaging, Digital breast tomosynthesis, Imaging systems, Image quality, Digital imaging, Iodine

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Proceedings Article | 2 March 2011 Paper

3D density estimation in digital breast tomosynthesis: application to needle path planning for breast biopsy

Laurence Vancamberg, Nausikaa Geeraert, Razvan Iordache, Giovanni Palma, Rémy Klausz, Serge Muller

Proceedings Volume 7964, 79640D (2011) https://doi.org/10.1117/12.878169

KEYWORDS: Digital breast tomosynthesis, Breast, 3D modeling, Tissues, Binary data, 3D image processing, Biopsy, 3D acquisition, Reconstruction algorithms, X-rays

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Proceedings Article | 14 March 2009 Paper

Dual-energy contrast enhanced digital mammography: theoretical and experimental study of optimal monoenergetic beam parameters using synchrotron radiation

Sylvie Puong, Razvan Iordache, Xavier Bouchevreau, Serge Muller

Proceedings Volume 7258, 72583U (2009) https://doi.org/10.1117/12.811596

KEYWORDS: Image quality, Iodine, Breast, Sensors, Tissues, Synchrotron radiation, Digital mammography, Mammography, Image enhancement, Signal attenuation

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Proceedings Article | 3 March 2009 Paper

Detection of convergence areas in digital breast tomosynthesis using a contrario modeling

G. Palma, S. Muller, I. Bloch, R. Iordache

Proceedings Volume 7260, 72600P (2009) https://doi.org/10.1117/12.807547

KEYWORDS: Digital breast tomosynthesis, Medical imaging, Computer aided diagnosis and therapy, Current controlled current source, Architectural distortion, Databases, Breast

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Proceedings Article | 18 March 2008 Paper

Optimization of beam parameters and iodine quantification in dual-energy contrast enhanced digital breast tomosynthesis

Sylvie Puong, Xavier Bouchevreau, Nicolas Duchateau, Razvan Iordache, Serge Muller

Proceedings Volume 6913, 69130Z (2008) https://doi.org/10.1117/12.770148

KEYWORDS: Iodine, Breast, Sensors, Point spread functions, Signal attenuation, Image quality, X-rays, Digital breast tomosynthesis, Tissues, Digital mammography

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Proceedings Article | 30 March 2007 Paper

Fast microcalcification detection on digital breast tomosynthesis datasets

S. Bernard, S. Muller, G. Peters, R. Iordache

Proceedings Volume 6514, 65141X (2007) https://doi.org/10.1117/12.709987

KEYWORDS: Optical spheres, Digital breast tomosynthesis, Breast, Wavelets, Calcium, Signal attenuation, Sensors, Visualization, Tissues, Convolution

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Proceedings Article | 21 March 2007 Paper

Dual-energy contrast enhanced digital breast tomosynthesis: concept, method, and evaluation on phantoms

Sylvie Puong, Fanny Patoureaux, Razvan Iordache, Xavier Bouchevreau, Serge Muller

Proceedings Volume 6510, 65100U (2007) https://doi.org/10.1117/12.710106

KEYWORDS: Iodine, Reconstruction algorithms, Breast, Digital breast tomosynthesis, Tomography, Manganese, X-rays, Sensors, Signal to noise ratio, Visibility

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Proceedings Article | 21 March 2007 Paper

Dual-energy contrast enhanced digital mammography using a new approach for breast tissue canceling

Sylvie Puong, Xavier Bouchevreau, Fanny Patoureaux, Razvan Iordache, Serge Muller

Proceedings Volume 6510, 65102H (2007) https://doi.org/10.1117/12.710133

KEYWORDS: Iodine, Breast, Algorithm development, Tissues, Image quality, Digital mammography, Detection and tracking algorithms, Computer simulations, X-rays, Calibration

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Proceedings Article | 10 March 2006 Paper

Reconstruction-independent 3D CAD for mass detection in digital breast tomosynthesis using fuzzy particles

G. Peters, S. Muller, S. Bernard, R. Iordache, I. Bloch

Proceedings Volume 6144, 61441Z (2006) https://doi.org/10.1117/12.653633

KEYWORDS: Particles, Fuzzy logic, Digital breast tomosynthesis, Image processing, Reconstruction algorithms, Computer aided design, Mammography, 3D image processing, Wavelets, Databases

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Proceedings Article | 5 June 2003 Paper

Controlling gray-level variation in contrast-enhanced digital mammography: design of a calibration procedure

Fanny Jeunehomme, Razvan Iordache, Serge Muller, Gordon Mawdsley, Martin Yaffe

Proceedings Volume 5030, (2003) https://doi.org/10.1117/12.480485

KEYWORDS: Calibration, Iodine, Breast, Digital mammography, Sensors, Tissues, Mammography, Tumors, X-ray sources, X-ray imaging

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SPIE Journal Paper | 1 December 2002

Fuzzy block truncation coding

Abdel-Ouahab Boudraa, Azeddine Beghdadi, Sidi-Mohammed Dehak, Razvan Iordache

OE, Vol. 41, Issue 12, (December 2002) https://doi.org/10.1117/12.10.1117/1.1518031

KEYWORDS: Fuzzy logic, Image compression, Image quality, Image processing algorithms and systems, Quantization, Image segmentation, Image processing, Prototyping, Optical engineering, Reconstruction algorithms

Showing 5 of 19 publications

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