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1. Tests of CPT and Quantum Mechanics: experiment

Author

M. Moulson, A. De Santis, Francesco Lacava, Juliet Lee-Franzini, C. Forti, F. Perfetto, M. Napolitano, M. A. Matsyuk, Andrea Doria, Luca Tortora, V. V. Kulikov, Enrico Pasqualucci, B. Valeriani, F. Cervelli, Ludovico Pontecorvo, M. Testa, G. Lanfranchi, G. Venanzoni, A. Di Domenico, E. De Lucia, M. L. Ferrer, P. De Simone, P. Campana, S. Dell'Agnello, M. Martemianov, Margherita Primavera, Paolo Santangelo, W. Mei, S. Chi, S. Giovannella, F. Murtas, E. Spiriti, L. Passalacqua, D. Leone, P. Massarotti, T. Spadaro, S. Bocchetta, Barbara Sciascia, M. Martini, P. Branchini, M. Dreucci, M. Barva, S. Fiore, F. Nguyen, A. G. Denig, Stefano Veneziano, D. Bowring, E. Graziani, S. Bertolucci, S. Ventura, Claudio Gatti, A. Ventura, R. Messi, G. Chiefari, E. Santovetti, M. Palutan, C. Di Donato, T. Capussela, G. Capon, B. Di Micco, C. Bacci, Cesare Bini, Filippo Ceradini, G. Carboni, S. Conetti, W. Kluge, S. Di Falco, G. Felici, M. Incagli, R. D. Schamberger, P. Beltrame, S. Miscetti, G. Saracino, Fabrizio Scuri, Paolo Ciambrone, F. Ambrosino, M. Antonelli, R. Caloi, S. Meola, G. Finocchiaro, A. Antonelli, A.L. Sibidanov, I. Villella, V. Bocci, M. Tabidze, G. De Zorzi, A. Passeri, P. Gauzzi, R. Versaci, A. Farilla, Igor Sfiligoi, Edoardo Gorini, F. Bossi, G. Xu, C. Bloise, P. Franzini, S. Müller, S. A. Bulychjov, G. Bencivenni, Vincenzo Patera, A. Sciubba, P. Valente, and A. Ferrari

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Quantum decoherence, T-symmetry, CPT symmetry, Quantum mechanics, High Energy Physics::Phenomenology, Quantum interference, Time evolution, High Energy Physics::Experiment, Atomic and Molecular Physics, and Optics, Communication channel
Abstract

Neutral kaons provide one of the systems most sensitive to quantum mechanics and CPT violation. Models predicting quantum mechanics violation, also related to CPT violation, have been tested at the CPLEAR and KLOE experiments. In this report results of CPLEAR obtained by studying the time evolution of single and two entangled kaons are reviewed. New or improved limits on decoherence and CPT violation parameters have been obtained by KLOE studying the quantum interference in the channel ϕ → K S K L → π + π − π + π − . No deviations from the expectations of quantum mechanics and CPT symmetry have been observed.

Published
2007
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2. Measurement of σ(e+e−→π+π−γ) and extraction of σ(e+e−→π+π−) below 1 GeV with the KLOE detector

Author

L. Passalacqua, L. Tortora, F. Murtas, A. Denig, Enrico Pasqualucci, C. Forti, Alberto Aloisio, G. Finocchiaro, O. Erriquez, R. Messi, A. Passeri, R. D. Schamberger, A. Ferrari, S. Miscetti, G. Felici, F. Bossi, M. Napolitano, M. Palutan, G. Saracino, F. Perfetto, P. Gauzzi, W. Mei, E. Spiriti, M. Incagli, G. Capon, M. Barva, B. Valeriani, F. Cervelli, I. Villella, V. Bocci, T. Spadaro, M. A. Matsyuk, Fabrizio Scuri, M. Testa, J. Lee-Franzini, P. Santangelo, Massimo Antonelli, E. Santovetti, P. De Simone, R. Caloi, Barbara Sciascia, Andrea Ventura, M. Martini, Alessandra Doria, S. Giovannella, P. Valente, G. Lanfranchi, S. Di Falco, P. Branchini, M. Dreucci, S. Müller, S. Bertolucci, S. Conetti, S.A. Bulychjov, F. Nguyen, Margherita Primavera, Leonardo Merola, G. De Zorzi, F. Ambrosino, Addolorata Farilla, G. Xu, Ludovico Pontecorvo, G. Venanzoni, G. Bencivenni, M. Moulson, A. De Santis, M. L. Ferrer, S. Dell'Agnello, F. Cevenini, Francesco Lacava, C. Bloise, M. Martemianov, G. Carboni, C. Gatti, Edoardo Gorini, E. Graziani, A.L. Sibidanov, A. Di Domenico, D. Leone, G. Chiefari, C. Di Donato, P. Campana, Stefano Veneziano, P. Ciambrone, F. Ceradini, B. Di Micco, Emilio Petrolo, Vincenzo Patera, R. Versaci, Igor Sfiligoi, A. Sciubba, W. Kluge, E. De Lucia, V. Kulikov, S. Ventura, P. Franzini, T. Capussela, A. Antonelli, C. Bacci, and Cesare Bini

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Electron–positron annihilation, Hadron, Form factor (quantum field theory), law.invention, Nuclear physics, Pion, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Invariant mass, Anomaly (physics), Nuclear Experiment, Collider
Abstract

We have measured the cross section σ ( e + e − → π + π − γ ) at an energy W = m ϕ = 1.02 GeV with the KLOE detector at the electron–positron collider DA Φ NE . From the dependence of the cross section on the invariant mass of the two-pion system, we extract σ ( e + e − → π + π − ) for the mass range 0.35 s 0.95 GeV 2 . From this result, we calculate the pion form factor and the hadronic contribution to the muon anomaly, a μ .

Published
2005
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3. Upper limit on the η→π+π− branching ratio with the KLOE detector

Author

G. Finocchiaro, P. Franzini, Stefan E. Müller, G. Capon, Margherita Primavera, B. Di Micco, P. Gauzzi, R. Caloi, Claudio Gatti, C. Bloise, S. Chi, Maddalena Napolitano, L. Passalacqua, P. Massarotti, Barbara Sciascia, Andrea Ventura, M. Martini, S. Miscetti, Enrico Pasqualucci, P. Branchini, M. Dreucci, Cesare Bini, R. Versaci, A. Farilla, Igor Sfiligoi, G. Saracino, G. Carboni, Francesco Lacava, S. Ventura, D. Leone, C. Bacci, Massimo Antonelli, G. Venanzoni, Stefano Veneziano, P. Beltrame, E. De Lucia, M. L. Ferrer, G. Bencivenni, Andrea Ferrari, F. Nguyen, W. Kluge, Marianna Testa, E. Spiriti, A. Di Domenico, S. Meola, E. Graziani, L. Tortora, S. Dell'Agnello, M. Palutan, G. Lanfranchi, R. Messi, F. Bossi, W. Mei, T. Spadaro, Paolo Santangelo, Pierluigi Campana, F. Murtas, T. Capussela, G. Xu, A. Passeri, C. Forti, I. Villella, V. Bocci, A. Antonelli, S. Di Falco, M. Barva, M. A. Matsyuk, M. Moulson, A. De Santis, S. Bertolucci, V. V. Kulikov, G. Felici, G. De Zorzi, Alessandra Doria, F. Ambrosino, Ludovico Pontecorvo, P. De Simone, M. Martemianov, Filippo Ceradini, A. G. Denig, F. Perfetto, Paolo Ciambrone, B. Valeriani, G. Chiefari, F. Cervelli, C. Di Donato, Edoardo Gorini, Vincenzo Patera, Juliet Lee-Franzini, A. Sciubba, S. Giovannella, P. Valente, E. Santovetti, D. Bowring, S. Conetti, M. Incagli, and Fabrizio Scuri

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Electron–positron annihilation, Detector, Pi, High Energy Physics::Experiment, Limit (mathematics)
Abstract

We have searched with the KLOE detector for the P and CP violating decay eta --> pi(+)pi(-) in a sample of 1.55 x 10(7) eta's from the decay phi --> etagamma of phi-mesons produced in e(+)e(-) annihilations at DAPhiNE. No signal is found. We obtain the upper limit BR(eta --> pi(+)pi(-)) < 1.3 x 10(-5) at 90% confidence level. (C) 2004 Elsevier B.V. All rights reserved.

Published
2005
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4. Measurement of the branching ratio for the decay K±→π±π0π0 with the KLOE detector

Author

Paolo Santangelo, Pierluigi Campana, B. Di Micco, F. Murtas, Emilio Petrolo, E. Santovetti, Leonardo Merola, G. Capon, F. Bossi, R. Versaci, G. De Zorzi, Enrico Pasqualucci, Filippo Ceradini, Igor Sfiligoi, S. Conetti, L. Passalacqua, Juliet Lee-Franzini, F. Ambrosino, G. Finocchiaro, O. Erriquez, C. Bacci, Cesare Bini, A. Denig, A.L. Sibidanov, S. Bertolucci, Addolorata Farilla, P. Franzini, S. Giovannella, G. Chiefari, R. Messi, Alberto Aloisio, Margherita Primavera, C. Di Donato, F. Lu, P. Gauzzi, W. Mei, Massimo Antonelli, Luca Tortora, Stefano Veneziano, Alessandra Doria, F. Perfetto, F. Cevenini, G. Saracino, S. Miscetti, Barbara Sciascia, Andrea Ventura, B. Valeriani, Paolo Ciambrone, V. Bocci, M. Martini, G. Bencivenni, P. Valente, M. Incagli, S. Dell'Agnello, F. Cervelli, E. Spiriti, A. Di Domenico, G. Xu, W. Kluge, C. Gatti, G. Venanzoni, R. Caloi, Ludovico Pontecorvo, Fabrizio Scuri, Stefan E. Müller, Massimo Testa, M. L. Ferrer, D. Leone, C. Bloise, E. De Lucia, M. Martemianov, T. Spadaro, Edoardo Gorini, G. Carboni, A. Ferrari, I. Villella, R. D. Schamberger, G. Lanfranchi, P. De Simone, S. Di Falco, S.A. Bulychjov, P. Branchini, A. Passeri, M. Dreucci, F. Nguyen, M. Palutan, Vincenzo Patera, A. Sciubba, Francesco Lacava, E. Graziani, M. Moulson, A. De Santis, V. V. Kulikov, C. Forti, M. Napolitano, M. Barva, M. A. Matsyuk, G. Felici, T. Capussela, and A. Antonelli

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, law, Detector, Pi, Collider, law.invention
Abstract

We have measured the absolute branching ratio BR ( K ± → π ± π 0 π 0 ) with the KLOE detector at the DAΦNE e + e − collider. We collected ∼ 3.3 × 10 7 tagged charged kaons, from the reaction e + e − → ϕ → K + K − . We find BR ( K ± → π ± π 0 π 0 ) = ( 1.763 ± 0.013 stat ± 0.022 syst ) × 10 − 2 .

Published
2004
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5. Recent KLOE Results on Kaon Physics

Author

AMBROSINO, FABIO, CHIEFARI, GIOVANNI, DI DONATO, CAMILLA, MASSAROTTI, PAOLO, MEOLA, SABINO, NAPOLITANO, MARCO, PERFETTO, FRANCESCO, SARACINO, GIULIO, A. Antonelli, M. Antonelli, C. Bacci, M. Barva, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, D. Bowring, P. Branchini, S. A. Bulychjov, R. Caloi, P. Campana, G. Capon, T. Capussela, G. Carboni, F. Ceradini, F. Cervelli, S. Chi, P. Ciambrone, S. Conetti, E. D. Lucia, A. D. Santis, P. d. Simone, G. D. Zorzi, S. Dell'Agnello, A. Denig, A. D. Domenico, S. D. Falco, B. D. Micco, A. Doria, M. Dreucci, A. Farilla, G. Felici, A. Ferrari, M. L. Ferrer, G. Finocchiaro, C. Forti, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Gorini, E. Graziani, M. Incagli, W. Kluge, V. Kulikov, F. Lacava, G. Lanfranchi, J. Lee Franzini, D. Leone, M. Martemianov, M. Martini, M. Matsyuk, W. Mei, R. Messi, S. Miscetti, M. Moulson, S. Muller, F. Murtas, F. Nguyen, M. Palutan, E. Pasqualucci, L. Passalacqua, A. Passeri, V. Patera, L. Pontecorvo, M. Primavera, P. Santangelo, E. Santovetti, R. D. Schamberger, B. Sciascia, A. Sciubba, F. Scuri, I. Sfiligoi, A. Sibidanov, T. Spadaro, E. Spiriti, M. Tabidze, M. Testa, L. Tortora, P. Valente, B. Valeriani, G. Venanzoni, S. Veneziano, A. Ventura, R. Versaci, I. Villella, G. Xu, Ambrosino, Fabio, A., Antonelli, M., Antonelli, C., Bacci, M., Barva, P., Beltrame, G., Bencivenni, S., Bertolucci, C., Bini, C., Bloise, V., Bocci, F., Bossi, D., Bowring, P., Branchini, S. A., Bulychjov, R., Caloi, P., Campana, G., Capon, T., Capussela, G., Carboni, F., Ceradini, F., Cervelli, S., Chi, Chiefari, Giovanni, P., Ciambrone, S., Conetti, E. D., Lucia, A. D., Santi, P. d., Simone, G. D., Zorzi, S., Dell'Agnello, A., Denig, A. D., Domenico, DI DONATO, Camilla, S. D., Falco, B. D., Micco, A., Doria, M., Dreucci, A., Farilla, G., Felici, A., Ferrari, M. L., Ferrer, G., Finocchiaro, C., Forti, P., Franzini, C., Gatti, P., Gauzzi, S., Giovannella, E., Gorini, E., Graziani, M., Incagli, W., Kluge, V., Kulikov, F., Lacava, G., Lanfranchi, J., Lee Franzini, D., Leone, M., Martemianov, M., Martini, Massarotti, Paolo, M., Matsyuk, W., Mei, Meola, Sabino, R., Messi, S., Miscetti, M., Moulson, S., Muller, F., Murta, Napolitano, Marco, F., Nguyen, M., Palutan, E., Pasqualucci, L., Passalacqua, A., Passeri, V., Patera, Perfetto, Francesco, L., Pontecorvo, M., Primavera, P., Santangelo, E., Santovetti, Saracino, Giulio, R. D., Schamberger, B., Sciascia, A., Sciubba, F., Scuri, I., Sfiligoi, A., Sibidanov, T., Spadaro, E., Spiriti, M., Tabidze, M., Testa, L., Tortora, P., Valente, B., Valeriani, G., Venanzoni, S., Veneziano, A., Ventura, R., Versaci, I., Villella, and G., Xu

Subjects
Physics, Nuclear physics, Particle physics, Annihilation, Branching fraction, Center of mass
Abstract

The KLOE experiment at DAΦNE has collected ∼ 450 pb−1 of e+e− collisions at center of mass energy W ∼ 1.02 GeV. Final results on the BR(KS → 3π0), KL dominant Branching ratio, KL lifetime and the extraction of the CKM parameter Vus are presented.

Published
2005
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6. Light meson spectroscopy with the KLOE experiment

Author

AMBROSINO, FABIO, CHIEFARI, GIOVANNI, DI DONATO, CAMILLA, MASSAROTTI, PAOLO, NAPOLITANO, MARCO, PERFETTO, FRANCESCO, SARACINO, GIULIO, A. Antonelli, M. Antonelli, C. Bacci, M. Barva, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, D. Bowring, P. Branchini, R. Caloi, P. Campana, G. Capon, T. Capussela, G. Carboni, F. Ceradini, F. Cervelli, S. Chi, P. Ciambrone, S. Conetti, E. D. Lucia, A. D. Santis, P. D. Simone, G. D. Zorzi, S. Dell'Agnello, A. Denig, A. D. Domenico, S. D. Falco, B. D. Micco, A. Doria, M. Dreucci, A. Farilla, G. Felici, A. Ferrari, M. L. Ferrer, G. Finocchiaro, C. Forti, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Gorini, E. Graziani, M. Incagli, W. Kluge, V. Kulikov, F. Lacava, G. Lanfranchi, J. Lee Franzini, D. Leone, M. Martemianov, M. Martini, M. Matsyuk, W. Mei, S. Meola, R. Messi, S. Miscetti, F. Nguyen, M. Palutan, E. Pasqualucci, L. Passalacqua, A. Passeri, V. Patera, L. Pontecorvo, M. Primavera, P. Santangelo, E. Santovetti, B. Sciascia, A. Sciubba, F. Scuri, I. Sfiligoi, T. Spadaro, E. Spiriti, M. Testa, L. Tortora, P. Valente, B. Valeriani, G. Venanzoni, S. Veneziano, A. Ventura, S. Ventura, R. Versaci, I. Villella, G. Xu, Ambrosino, Fabio, A., Antonelli, M., Antonelli, C., Bacci, M., Barva, P., Beltrame, G., Bencivenni, S., Bertolucci, C., Bini, C., Bloise, V., Bocci, F., Bossi, D., Bowring, P., Branchini, R., Caloi, P., Campana, G., Capon, T., Capussela, G., Carboni, F., Ceradini, F., Cervelli, S., Chi, Chiefari, Giovanni, P., Ciambrone, S., Conetti, E. D., Lucia, A. D., Santi, P. D., Simone, G. D., Zorzi, S., Dell'Agnello, A., Denig, A. D., Domenico, DI DONATO, Camilla, S. D., Falco, B. D., Micco, A., Doria, M., Dreucci, A., Farilla, G., Felici, A., Ferrari, M. L., Ferrer, G., Finocchiaro, C., Forti, P., Franzini, C., Gatti, P., Gauzzi, S., Giovannella, E., Gorini, E., Graziani, M., Incagli, W., Kluge, V., Kulikov, F., Lacava, G., Lanfranchi, J., Lee Franzini, D., Leone, M., Martemianov, M., Martini, Massarotti, Paolo, M., Matsyuk, W., Mei, S., Meola, R., Messi, S., Miscetti, Napolitano, Marco, F., Nguyen, M., Palutan, E., Pasqualucci, L., Passalacqua, A., Passeri, V., Patera, Perfetto, Francesco, L., Pontecorvo, M., Primavera, P., Santangelo, E., Santovetti, Saracino, Giulio, B., Sciascia, A., Sciubba, F., Scuri, I., Sfiligoi, T., Spadaro, E., Spiriti, M., Testa, L., Tortora, P., Valente, B., Valeriani, G., Venanzoni, S., Veneziano, A., Ventura, S., Ventura, R., Versaci, I., Villella, and G., Xu

Subjects
BRANCHING RATIO, DECAY, DETECTOR, ETA, PHI
Published
2005

7. Parallel integral projection transform for straight electrode localization in 3-D ultrasound images

Author

Marian Uhercik, Herve Liebgott, Jean Martial Mari, Václav Hlaváč, M. Barva, Jean-René Duhamel, Christian Cachard, and Jan Kybic

Subjects
Acoustics and Ultrasonics, Computer science, Image processing, Sensitivity and Specificity, Prosthesis Implantation, Speckle pattern, Optics, Imaging, Three-Dimensional, Position (vector), Image Interpretation, Computer-Assisted, Medical imaging, Humans, Computer vision, Electrical and Electronic Engineering, Instrumentation, Image resolution, Ultrasonography, Interventional, Radon transform, business.industry, Phantoms, Imaging, Reproducibility of Results, Speckle noise, Image segmentation, Image Enhancement, Electrodes, Implanted, Artificial intelligence, business
Abstract

In surgical practice, small metallic instruments are frequently used to perform various tasks inside the human body. We address the problem of their accurate localization in the tissue. Recent experiments using medical ultrasound have shown that this modality is suitable for real-time visualization of anatomical structures as well as the position of surgical instruments. We propose an image- processing algorithm that permits automatic estimation of the position of a line-segment-shaped object. This method was applied to the localization of a thin metallic electrode in biological tissue. We show that the electrode axis can be found through maximizing the parallel integral projection transform that is a form of the Radon transform. To accelerate this step, hierarchical mesh-grid algorithm is implemented. Once the axis position is known, localization of the electrode tip is performed. The method was tested on simulated images, on ultrasound images of a tissue mimicking phantom containing a metallic electrode, and on real ultrasound images from breast biopsy. The results indicate that the algorithm is robust with respect to variations in electrode position and speckle noise. Localization accuracy is of the order of hundreds of micrometers and is comparable to the ultrasound system axial resolution.

Published
2008

8. P3A-3 Comparison of Methods for Tool Localization in Biological Tissue from 3D Ultrasound Data

Author

Herve Liebgott, Jan Kybic, H. Hlavac, M. Barva, and Christian Cachard

Subjects
Radon transform, medicine.diagnostic_test, business.industry, Computer science, Ultrasound, Estimator, 02 engineering and technology, RANSAC, computer.software_genre, Imaging phantom, 03 medical and health sciences, 0302 clinical medicine, Transformation (function), Voxel, 020204 information systems, 0202 electrical engineering, electronic engineering, information engineering, medicine, Computer vision, 3D ultrasound, Artificial intelligence, business, computer, 030217 neurology & neurosurgery
Abstract

In medical applications, miniature surgical instruments such as needles, or electrodes are introduced into human body. The position of instrument in tissue can be estimated using 3D ultrasound. In previous publications, we introduced two novel algorithms for automatic electrode localization from 3D ultrasound images. The first method is based on the parallel integral projection (PIP) transform, a modification of the Radon transform. We showed that the axis of the electrode can be estimated from the maximum of PIP transformation. To accelerate search for the maximum, a hierarchical mesh-grid algorithm is implemented. In second method, the electrode axis is described by a cubic polynomial. The distribution of voxel intensities inside the electrode region is a priori estimated from acquired data. The model parameters are robustly estimated using the RANSAC estimator. In this paper, their performance in terms of accuracy is compared. A series of tests on numerical phantoms created with the FIELD II simulation program were performed to quantitatively evaluate the localization accuracy. We observed a decrease in accuracy when artificial noise was added to the input data. The algorithms were also tested on real ultrasound data of a cryogel phantom comprising metallic electrode

Published
2006
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9. Automatic localization of curvilinear object in 3D ultrasound images

Author

Václav Hlaváč, Jean Martial Mari, Jan Kybic, Christian Cachard, and M. Barva

Subjects
Curvilinear coordinates, Data processing, medicine.diagnostic_test, business.industry, RANSAC, Curvature, Thresholding, Position (vector), medicine, 3D ultrasound, Computer vision, Artificial intelligence, business, Mathematics, Statistical hypothesis testing
Abstract

Utilization of tools during surgical interventions sets the problem of their accurate localization within biological tissue. The ultrasound imaging represents an inexpensive and a flexible approach for a real-time image acquisition of tissue structure with metal instruments. There are several difficulties involving processing of ultrasound images: Their noisy nature makes the localization task difficult; the objects appear irregular and incomplete. Our task is to determine the position of a curvilinear electrode in biological tissue from a three-dimensional ultrasound image. Initially, the data are segmented by thresholding and processed with the randomized version of the RANSAC (R-RANSAC) algorithm. The curvilinear electrode is modeled by a three-dimensional cubic curve. Its shape is subject to check using a curvature measure in the hypothesis evaluation step of the R-RANSAC algorithm. Subsequently, we perform the least squares curve fitting to the data that have been marked by the R-RANSAC as the ones corresponding to the sought object. The position estimation is optimal with respect to the mean square criterion. Finally, the localization of the electrode tips is carried out by a hypothesis testing on the distances between projections of inliers on the estimated curve. The algorithm has been tested on real three-dimensional ultrasound images of a tissue mimicking phantom with a curvilinear object. From the results, we conclude that the method is very stable even if the data contain high percentage of outliers. The computational cost of the algorithm shows the possibility of real-time data processing.

Published
2005
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10. Radial radon transform dedicated to micro-object localization from radio frequency ultrasound signal

Author

M. Barva, Jean Martial Mari, Jan Kybic, and Christian Cachard

Subjects
Radon transform, Property (programming), business.industry, Computer science, Acoustics, Electrode, Ultrasound, Process (computing), Electrical engineering, Radio frequency, business, Signal, Imaging phantom
Abstract

In this paper we describe a method for automatic electrode localization in soft tissue from a radiofrequency signal. The method exploits a property of the Radon transform (RT) that allows us to localize a line-segment in 3D data. The method directly processes the radiofrequency (RF) signal provided by the ultrasound (US) probe. Thus, there is no need for ultrasound image reconstruction. The method is able to detect line-segments that are discontinuous. The low computational cost allows us to process data in real-time. The algorithm was tested on a radiofrequency signal acquired by scanning a phantom containing a thin metal electrode of 150 /spl mu/m in diameter. The experiments show that the developed technique is capable of reliably finding an arbitrarily positioned line-segment in a 3D image.

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