Prof. Homero Schiabel Profile

Prof. Homero Schiabel

Associate Professor at Univ de São Paulo

SPIE Involvement:

Author

Area of Expertise:

Quality assurance in mammography , Computer-aided diagnosis in mammography , Digital mammographic images

Websites:

Company Website

Publications (41)

Proceedings Article | 3 April 2023 Poster + Paper

Comparative tests between actual and simulated digital mammography images for new computer schemes evaluation database

Fernanda J. Cardoso, Homero Schiabel

Proceedings Volume 12467, 1246710 (2023) https://doi.org/10.1117/12.2653336

KEYWORDS: Mammography, Breast, Databases, Digital mammography, Visualization, Displays, Computer simulations, Computer aided detection, Software development, Image processing

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Proceedings Article | 27 February 2019 Paper

A new method for estimating photometric and colorimetric properties using RGB sensor and ANN

Marcio Mello, Victor A. Lincoln, Robson Barcellos, Giuseppe Cirino, Homero Schiabel, Liliane Ventura

Proceedings Volume 10913, 109131I (2019) https://doi.org/10.1117/12.2510397

KEYWORDS: Transmittance, Photometry, Sensors, Light emitting diodes, Prototyping, Calibration, RGB color model, Optical filters, Spectrophotometry, Light sources

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Proceedings Article | 10 March 2017 Paper

Automatic breast tissue density estimation scheme in digital mammography images

Renan Menechelli, Ana Luisa Pacheco, Homero Schiabel

Proceedings Volume 10136, 101361J (2017) https://doi.org/10.1117/12.2253186

KEYWORDS: Breast, Tissues, Image classification, Digital mammography, Computer aided diagnosis and therapy, Mammography, Image segmentation, Breast cancer, Feature extraction, Neural networks

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Proceedings Article | 10 March 2017 Presentation + Paper

A comparison of methods to evaluate gray scale response of tomosynthesis systems using a software breast phantom

Maria A. Z. Sousa, Predrag Bakic, Homero Schiabel, Andrew D. A. Maidment

Proceedings Volume 10136, 101360J (2017) https://doi.org/10.1117/12.2255554

KEYWORDS: Spatial resolution, Breast, Digital breast tomosynthesis, Digital imaging, Image quality, Computer simulations, Breast cancer, 3D image processing, Signal to noise ratio, Interference (communication), 3D modeling, Reconstruction algorithms

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Proceedings Article | 10 March 2017 Paper

Assessment of automatic exposure control performance in digital mammography using a no-reference anisotropic quality index

Bruno Barufaldi, Lucas Borges, Predrag Bakic, Marcelo A. C. Vieira, Homero Schiabel, Andrew D. Maidment

Proceedings Volume 10136, 101360U (2017) https://doi.org/10.1117/12.2255629

KEYWORDS: Image quality, Breast, Automatic exposure, Automatic control, Mammography, Digital mammography, Anisotropy, Image processing, Skin, Image compression, Binary data

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Proceedings Article | 3 March 2017 Paper

Agreement between a computer-assisted tool and radiologists to classify lesions in breast elastography images

Karem Marcomini, Eduardo F. Fleury, Vilmar Oliveira, Antonio A. Carneiro, Homero Schiabel, Robert Nishikawa

Proceedings Volume 10134, 101342T (2017) https://doi.org/10.1117/12.2255001

KEYWORDS: Breast, Elastography, Breast cancer, Mammography, Color imaging, Databases, Ultrasonography, Diagnostics, Visualization, RGB color model, Visual analytics, Cancer

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Proceedings Article | 3 March 2017 Paper

Evaluation of a processing scheme for calcified atheromatous carotid artery detection in face/neck CBCT images

B. R. Matheus, B. Centurion, I. R. Rubira-Bullen, H. Schiabel

Proceedings Volume 10134, 101344E (2017) https://doi.org/10.1117/12.2255568

KEYWORDS: Arteries, 3D image enhancement, Computed tomography, Neck, 3D image processing, Image processing, Computer aided diagnosis and therapy, Medical imaging, X-ray imaging, Bone, Binary data, Signal detection, Convolution, Tissues

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Proceedings Article | 24 March 2016 Paper

Observer study to evaluate the simulation of mammographic calcification clusters

Maria A. Sousa, Karem Marcomini, Predrag Bakic, Andrew D.A. Maidment, Homero Schiabel

Proceedings Volume 9787, 97871D (2016) https://doi.org/10.1117/12.2217257

KEYWORDS: Mammography, Breast, Digital mammography, Breast cancer, Image quality, Tissues, Image analysis, Computer aided diagnosis and therapy, Digital imaging, Data acquisition

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Proceedings Article | 24 March 2016 Paper

Validation of no-reference image quality index for the assessment of digital mammographic images

Helder C. de Oliveira, Bruno Barufaldi, Lucas Borges, Salvador Gabarda, Predrag Bakic, Andrew D. Maidment, Homero Schiabel, Marcelo A. Vieira

Proceedings Volume 9787, 978713 (2016) https://doi.org/10.1117/12.2217229

KEYWORDS: Image quality, Digital imaging, Digital mammography, Mammography, Spatial resolution, Visual system, Breast, Signal to noise ratio, Image quality standards, Image analysis, Software development

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To ensure optimal clinical performance of digital mammography, it is necessary to obtain images with high spatial resolution and low noise, keeping radiation exposure as low as possible. These requirements directly affect the interpretation of radiologists. The quality of a digital image should be assessed using objective measurements. In general, these methods measure the similarity between a degraded image and an ideal image without degradation (ground-truth), used as a reference. These methods are called Full-Reference Image Quality Assessment (FR-IQA). However, for digital mammography, an image without degradation is not available in clinical practice; thus, an objective method to assess the quality of mammograms must be performed without reference. The purpose of this study is to present a Normalized Anisotropic Quality Index (NAQI), based on the Rényi entropy in the pseudo-Wigner domain, to assess mammography images in terms of spatial resolution and noise without any reference. The method was validated using synthetic images acquired through an anthropomorphic breast software phantom, and the clinical exposures on anthropomorphic breast physical phantoms and patient’s mammograms. The results reported by this noreference index follow the same behavior as other well-established full-reference metrics, e.g., the peak signal-to-noise ratio (PSNR) and structural similarity index (SSIM). Reductions of 50% on the radiation dose in phantom images were translated as a decrease of 4dB on the PSNR, 25% on the SSIM and 33% on the NAQI, evidencing that the proposed metric is sensitive to the noise resulted from dose reduction. The clinical results showed that images reduced to 53% and 30% of the standard radiation dose reported reductions of 15% and 25% on the NAQI, respectively. Thus, this index may be used in clinical practice as an image quality indicator to improve the quality assurance programs in mammography; hence, the proposed method reduces the subjectivity inter-observers in the reporting of image quality assessment.

Proceedings Article | 21 March 2016 Paper

Segmentation techniques evaluation based on a single compact breast mass classification scheme

Bruno R. Matheus, Karem Marcomini, Homero Schiabel

Proceedings Volume 9784, 978426 (2016) https://doi.org/10.1117/12.2217026

KEYWORDS: Image segmentation, Breast, Computer aided diagnosis and therapy, Classification systems, Digital mammography, Mammography, Databases, Image restoration, Image enhancement, Fuzzy logic, Neural networks, Image classification, Statistical analysis

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Proceedings Article | 18 March 2015 Paper

Using digital subtraction in computer simulated images as a tool to aid the visual detection of masked lesions in dense breasts

Homero Schiabel, Luciana Guimarães, Maria Sousa

Proceedings Volume 9412, 94122T (2015) https://doi.org/10.1117/12.2081188

KEYWORDS: Tissues, Breast, Computer simulations, Absorption, X-rays, Signal attenuation, Digital mammography, Mammography, X-ray imaging, Monte Carlo methods

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Proceedings Article | 18 March 2015 Paper

Investigating materials for breast nodules simulation by using segmentation and similarity analysis of digital images

Paula Siqueira, Karem Marcomini, Maria Sousa, Homero Schiabel

Proceedings Volume 9412, 94123F (2015) https://doi.org/10.1117/12.2082184

KEYWORDS: Image segmentation, Breast, Glasses, Databases, Mammography, Visualization, Computer aided diagnosis and therapy, Binary data, Digital mammography, Distortion

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Proceedings Article | 17 March 2015 Paper

Evaluation of a simulation procedure designed to recognize shape and contour of suspicious masses in mammography

Maria A. Sousa, Paula Siqueira, Homero Schiabel

Proceedings Volume 9416, 941618 (2015) https://doi.org/10.1117/12.2081231

KEYWORDS: Breast, Mammography, Visualization, Imaging systems, Computer aided diagnosis and therapy, Shape analysis, Tissues, Digital imaging, Bragg cells, Image quality

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Proceedings Article | 17 March 2015 Paper

Computational assessment of mammography accreditation phantom images and correlation with human observer analysis

Bruno Barufaldi, Kristen Lau, Homero Schiabel, D. Maidment

Proceedings Volume 9416, 941606 (2015) https://doi.org/10.1117/12.2082074

KEYWORDS: Mammography, Computing systems, Image classification, Image quality, Breast, Image processing, Classification systems, Image filtering, Databases, Software development

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Proceedings Article | 18 March 2014 Paper

Development of a computer tool to detect and classify nodules in ultrasound breast images

Karem Marcomini, Antonio Carneiro, Homero Schiabel

Proceedings Volume 9035, 90351O (2014) https://doi.org/10.1117/12.2043048

KEYWORDS: Image segmentation, Breast, Ultrasonography, Computer aided diagnosis and therapy, Feature extraction, Breast cancer, Visualization, Signal detection, Computer aided design, Image classification

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Proceedings Article | 11 March 2014 Paper

Investigating the visual inspection subjectivity on the contrast-detail evaluation in digital mammography images

Maria Sousa, Regina Medeiros, Homero Schiabel

Proceedings Volume 9037, 903716 (2014) https://doi.org/10.1117/12.2042904

KEYWORDS: Optical inspection, Mammography, Digital mammography, Gold, Visibility, Visualization, Inspection, Image quality, Breast, Image quality standards

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Proceedings Article | 11 March 2014 Paper

Study of quality perception in medical images based on comparison of contrast enhancement techniques in mammographic images

B. Matheus, L. Verçosa, B. Barufaldi, H. Schiabel

Proceedings Volume 9037, 90371I (2014) https://doi.org/10.1117/12.2043430

KEYWORDS: Image quality, Databases, Scanners, Digital mammography, Medical imaging, Absorbance, Mammography, Spatial resolution, Image processing, Image contrast enhancement

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Proceedings Article | 28 February 2014 Paper

UV protection for sunglasses: revisiting the standards

Mauro Masili, Homero Schiabel, Liliane Ventura

Proceedings Volume 8930, 89301E (2014) https://doi.org/10.1117/12.2036639

KEYWORDS: Ultraviolet radiation, Sun, Transmittance, Standards development, Lamps, Surface plasmons, Optical filters, Solar radiation, Ozone, Lenses

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Proceedings Article | 26 March 2013 Paper

Ocular UV protection: revisiting safe limits for sunglasses standards

Liliane Ventura, Mauro Masili, Homero Schiabel

Proceedings Volume 8567, 85671K (2013) https://doi.org/10.1117/12.2000355

KEYWORDS: Ultraviolet radiation, Sun, Transmittance, Lamps, Standards development, Surface plasmons, Ozone, Optical filters, Nonionizing radiation, Earth's atmosphere

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Proceedings Article | 28 February 2013 Paper

Quantitative evaluation of automatic methods for lesions detection in breast ultrasound images

Karem Marcomini, Homero Schiabel, Antonio Adilton Carneiro

Proceedings Volume 8670, 867027 (2013) https://doi.org/10.1117/12.2008056

KEYWORDS: Image segmentation, Breast, Ultrasonography, Image processing, Computer aided diagnosis and therapy, Mammography, Tissues, Digital signal processing, Bragg cells, Chromium

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SPIE Journal Paper | 11 February 2013

Automatic scanning software based on the characteristic curve of mammogram digitizers

Renata de Freitas Góes, Homero Schiabel, Maria Angélica Zucareli Sousa

JEI, Vol. 22, Issue 01, 013024, (February 2013) https://doi.org/10.1117/12.10.1117/1.JEI.22.1.013024

KEYWORDS: Image processing, Image segmentation, Mammography, Scanners, Image quality, Digital mammography, Digital imaging, Computer aided diagnosis and therapy, Breast, Software development

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Proceedings Article | 17 March 2011 Paper

Application of parameters for evaluating different technologies for digitizing film mammograms

Renata de Freitas Góes, Homero Schiabel, Maria Angélica Zucareli Sousa

Proceedings Volume 7961, 79615C (2011) https://doi.org/10.1117/12.878032

KEYWORDS: Mammography, Scanners, Image processing, Image quality, Unmanned aerial vehicles, Laser scanners, Computer aided diagnosis and therapy, CCD image sensors, Absorbance, 3D scanning

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Proceedings Article | 9 March 2011 Paper

A prototype of mammography CADx scheme integrated to imaging quality evaluation techniques

Homero Schiabel, Bruno R. Matheus, Michele Angelo, Ana Claudia Patrocínio, Liliane Ventura

Proceedings Volume 7963, 796323 (2011) https://doi.org/10.1117/12.877674

KEYWORDS: Computer aided diagnosis and therapy, Image processing, Mammography, Image segmentation, Prototyping, Image classification, Computer aided design, Breast, Scanners, Chromium

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Proceedings Article | 12 February 2011 Paper

Portable prototype for ultraviolet analysis of donated corneas

Liliane Ventura, Victor A. Lincoln, Homero Schiabel, Sidney Faria e Sousa

Proceedings Volume 7885, 78851M (2011) https://doi.org/10.1117/12.874797

KEYWORDS: Cornea, Ultraviolet radiation, Transmittance, Prototyping, Spectrophotometry, Eye, Tissues, Sensors, Ocean optics, Tissue optics

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Proceedings Article | 27 March 2009 Paper

Detection of clusters of microcalcification based on associated differential and morphological filters in full mammogram

Evanivaldo Silva, Homero Schiabel, Liliane Ventura

Proceedings Volume 7259, 72594G (2009) https://doi.org/10.1117/12.811911

KEYWORDS: Image segmentation, Image filtering, Image processing, Mammography, Optical filters, Breast, Computer aided diagnosis and therapy, Databases, Surface plasmons, Breast cancer

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Proceedings Article | 4 March 2009 Paper

Preprocessing for improving CAD scheme performance for microcalcification detection based on mammography imaging quality parameters

Homero Schiabel, Marcelo A. C. Vieira, Liliane Ventura

Proceedings Volume 7260, 72602G (2009) https://doi.org/10.1117/12.812015

KEYWORDS: Mammography, Image processing, Computer aided diagnosis and therapy, Breast, Optical transfer functions, Databases, Image quality, Computer aided design, Digital mammography, Image segmentation

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SPIE Journal Paper | 1 October 2008

Computational adjustment technique for digital mammographic images based on the digitizer characteristic curve

Renata Góes, Homero Schiabel

JEI, Vol. 17, Issue 04, 043012, (October 2008) https://doi.org/10.1117/12.10.1117/1.3013544

KEYWORDS: Laser scanners, Mammography, Image segmentation, Optical scanning, Image processing, Laser optics, Scanners, Computer aided diagnosis and therapy, Spatial resolution, Digital mammography

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Proceedings Article | 18 March 2008 Paper

Computational method for automatic determination of radiographic equipment anode angle

Marcelo A. Vieira, Paulo de Oliveira, Homero Schiabel

Proceedings Volume 6913, 69133M (2008) https://doi.org/10.1117/12.770942

KEYWORDS: X-rays, Point spread functions, Algorithm development, Image processing, X-ray imaging, Manufacturing, Image quality, Lead, Image analysis, Image filtering

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Proceedings Article | 12 May 2004 Paper

Evaluation of Bayesian network to classify clustered microcalcifications

Ana Patrocinio, Homero Schiabel, Roseli Romero

Proceedings Volume 5370, (2004) https://doi.org/10.1117/12.535757

KEYWORDS: Feature extraction, Mammography, Data modeling, Databases, Computer aided diagnosis and therapy, Breast, Breast cancer, Medical imaging, Image processing, Image segmentation

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Proceedings Article | 6 May 2004 Paper

Choosing proper mammography screen-film system by computer simulation

Kathy Senhorini, Homero Schiabel, Marcelo Vieira, Mauricio Escarpinati

Proceedings Volume 5368, (2004) https://doi.org/10.1117/12.534184

KEYWORDS: Mammography, Absorbance, Computer simulations, Image quality, Fiber optic gyroscopes, X-rays, Computing systems, Image acquisition, Data modeling, X-ray imaging

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Proceedings Article | 6 May 2004 Paper

Evaluation of film digitizer's spatial resolution by slit image computational analysis

Mauricio Escarpinati, Marcelo Vieira, Homero Schiabel

Proceedings Volume 5368, (2004) https://doi.org/10.1117/12.536056

KEYWORDS: Modulation transfer functions, Spatial resolution, Digital imaging, Image analysis, Optical scanning, Medical imaging, Image processing, Microscopes, Image resolution, Analog electronics

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Proceedings Article | 5 June 2003 Paper

Use of a film scanner as a microdensitometer for optical transfer function and focal spot measurements

Marcelo Vieira, Homero Schiabel, Mauricio Escarpinati

Proceedings Volume 5030, (2003) https://doi.org/10.1117/12.480228

KEYWORDS: Optical transfer functions, Modulation transfer functions, Scanners, X-rays, Absorbance, Phase transfer function, Mammography, Image processing, X-ray imaging, Spatial frequencies

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Proceedings Article | 15 May 2003 Paper

Classification of nodules in mammogram image by using wavelet transform

Cesar Santaella, Homero Schiabel, Ana Patrocinio, Fatima Nunes, Roseli Romero

Proceedings Volume 5032, (2003) https://doi.org/10.1117/12.483552

KEYWORDS: Wavelets, Image segmentation, Mammography, Wavelet transforms, Image classification, Mahalanobis distance, Medical imaging, Distance measurement, Shape analysis, Prototyping

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Proceedings Article | 28 May 1999 Paper

Image resolution improvement in nonisotropic mammography systems: determining the optimum region by MTF simulation procedures

Homero Schiabel

Proceedings Volume 3659, (1999) https://doi.org/10.1117/12.349532

KEYWORDS: Modulation transfer functions, Mammography, Point spread functions, Image resolution, Optical spheres, Imaging systems, Spatial resolution, Visualization, Spatial frequencies, X-rays

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Proceedings Article | 21 May 1999 Paper

Application of image processing techniques for contrast enhancement in dense breast digital mammograms

Fatima Nunes, Homero Schiabel, Rodrigo Benatti

Proceedings Volume 3661, (1999) https://doi.org/10.1117/12.348505

KEYWORDS: Signal detection, Image segmentation, Image processing, Linear filtering, Breast, Image filtering, Mammography, Image enhancement, Signal processing, Electronic filtering

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Proceedings Article | 24 July 1998 Paper

Quality assurance in mammography: a new instrument for operational characteristics and focal-spot-sizes measurements

Newton Curi, Annie Frere, Homero Schiabel, Henrique de Oliveira, Marcio Marques

Proceedings Volume 3336, (1998) https://doi.org/10.1117/12.317067

KEYWORDS: Sensors, Mammography, X-rays, Calibration, Software development, Silicon, Image quality, Electronic filtering, Computing systems, Data storage

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Proceedings Article | 24 July 1998 Paper

Computer simulation technique to preview the influence of the recording system on the image sharpness in mammography

Homero Schiabel, Marcia Silva, Henrique de Oliveira, Paulo Azevedo Marques, Annie Frere

Proceedings Volume 3336, (1998) https://doi.org/10.1117/12.317064

KEYWORDS: Mammography, Image quality, Computer simulations, Computing systems, Image processing, X-rays, Image enhancement, Image resolution, X-ray imaging, Absorbance

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Proceedings Article | 14 November 1996 Paper

Computer simulation of the geometric unsharpness effect on radiologic images

Marcio Marques, Annie Frere, Henrique de Oliveira, Homero Schiabel, Paulo Azevedo Marques, Ricardo Ferrari, Aledir Pereira

Proceedings Volume 2847, (1996) https://doi.org/10.1117/12.258274

KEYWORDS: Computer simulations, Computing systems, X-rays, Radiology, Mammography, Device simulation, X-ray imaging, Software, Imaging systems, Algorithm development

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Proceedings Article | 14 November 1996 Paper

Evaluating the radiologic images quality by simulation of objects sharpness

Henrique de Oliveira, Annie Frere, Homero Schiabel, Paulo Azevedo Marques, Marcio Marques, Aledir Pereira

Proceedings Volume 2847, (1996) https://doi.org/10.1117/12.258276

KEYWORDS: Point spread functions, X-ray sources, Optical spheres, Image quality, Computer simulations, Distortion, X-rays, Coded apertures, Mammography, Measurement devices

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Proceedings Article | 14 November 1996 Paper

Evaluating the focal spot MTF in all field locations by computer simulation

Paulo Azevedo Marques, Ricardo Ferrari, Homero Schiabel, Henrique de Oliveira, Marcio Marques, Annie Frere, Aledir Pereira

Proceedings Volume 2847, (1996) https://doi.org/10.1117/12.258266

KEYWORDS: Point spread functions, Modulation transfer functions, Computer simulations, Image quality, Imaging systems, Optical transfer functions, Image analysis, Spatial frequencies, Optical spheres, X-ray imaging

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Proceedings Article | 29 July 1993 Paper

Radiographic systems evaluation: obtaining the MTF by simulation

Homero Schiabel, Annie Frere

Proceedings Volume 1905, (1993) https://doi.org/10.1117/12.148688

KEYWORDS: Modulation transfer functions, X-rays, Imaging systems, Computer simulations, Spatial frequencies, Image processing, X-ray imaging, Image quality, Image filtering, Solids

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Showing 5 of 41 publications

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