Dr. Luis F. Gutiérrez Profile

Dr. Luis F. Gutiérrez

Senior Member Technical Staff at Philips Research North America

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Publications (5)

Proceedings Article | 24 February 2010 Paper

Absolute vs. relative error characterization of electromagnetic tracking accuracy

Mohammad Matinfar, Ganesh Narayanasamy, Luis Gutierrez, Raymond Chan, Ameet Jain

Proceedings Volume 7625, 762524 (2010) https://doi.org/10.1117/12.844326

KEYWORDS: Sensors, Calibration, Environmental sensing, Electromagnetism, Error analysis, Optical tracking, Visualization, X-rays, Navigation systems, Phase measurement

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Electromagnetic (EM) tracking systems are often used for real time navigation of medical tools in an Image Guided Therapy (IGT) system. They are specifically advantageous when the medical device requires tracking within the body of a patient where line of sight constraints prevent the use of conventional optical tracking. EM tracking systems are however very sensitive to electromagnetic field distortions. These distortions, arising from changes in the electromagnetic environment due to the presence of conductive ferromagnetic surgical tools or other medical equipment, limit the accuracy of EM tracking, in some cases potentially rendering tracking data unusable. We present a mapping method for the operating region over which EM tracking sensors are used, allowing for characterization of measurement errors, in turn providing physicians with visual feedback about measurement confidence or reliability of localization estimates. In this instance, we employ a calibration phantom to assess distortion within the operating field of the EM tracker and to display in real time the distribution of measurement errors, as well as the location and extent of the field associated with minimal spatial distortion. The accuracy is assessed relative to successive measurements. Error is computed for a reference point and consecutive measurement errors are displayed relative to the reference in order to characterize the accuracy in near-real-time. In an initial set-up phase, the phantom geometry is calibrated by registering the data from a multitude of EM sensors in a non-ferromagnetic ("clean") EM environment. The registration results in the locations of sensors with respect to each other and defines the geometry of the sensors in the phantom. In a measurement phase, the position and orientation data from all sensors are compared with the known geometry of the sensor spacing, and localization errors (displacement and orientation) are computed. Based on error thresholds provided by the operator, the spatial distribution of localization errors are clustered and dynamically displayed as separate confidence zones within the operating region of the EM tracker space.

Proceedings Article | 22 March 2007 Paper

Augmenting CT cardiac roadmaps with segmented streaming ultrasound

Qi Duan, Guy Shechter, Luis Gutiérrez, Douglas Stanton, Lyubomir Zagorchev, Andrew Laine, Daniel Elgort

Proceedings Volume 6509, 65090V (2007) https://doi.org/10.1117/12.711431

KEYWORDS: Image segmentation, Ultrasonography, Image registration, X-ray computed tomography, 3D modeling, Finite element methods, 3D image processing, Computed tomography, Image resolution, Motion models

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Proceedings Article | 21 March 2007 Paper

Multimodality image guidance system integrating x-ray fluoroscopy and ultrasound image streams with electromagnetic tracking

Luis Gutiérrez, Guy Shechter, Douglas Stanton, Sandeep Dalal, Daniel Elgort, Robert Manzke, Raymond Chan, Lyubomir Zagorchev

Proceedings Volume 6509, 65090K (2007) https://doi.org/10.1117/12.711527

KEYWORDS: X-rays, Ultrasonography, X-ray imaging, Imaging systems, Image registration, Electromagnetism, Computer programming, Sensors, 3D acquisition, 3D modeling

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Proceedings Article | 13 March 2006 Paper

Targeted endomyocardial injections of therapeutic cells using x-ray fused with MRI guidance

Luis Gutiérrez, Ranil de Silva, Elliot McVeigh, Cengizhan Ozturk, Robert Lederman

Proceedings Volume 6141, 614113 (2006) https://doi.org/10.1117/12.654279

KEYWORDS: Magnetic resonance imaging, Heart, Image segmentation, Image registration, Image fusion, 3D image processing, X-rays, Tissues, In vivo imaging, 3D acquisition

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Proceedings Article | 12 April 2005 Paper

Distortion correction, calibration, and registration: toward an integrated MR and x-ray interventional suite

Luis Gutierrez, Guy Shechter, Robert Lederman, Elliot McVeigh, Cengizhan Ozturk

Proceedings Volume 5744, (2005) https://doi.org/10.1117/12.597823

KEYWORDS: Image registration, Magnetic resonance imaging, 3D image reconstruction, Calibration, Distortion, Image segmentation, X-rays, X-ray imaging, 3D image processing, Electrons

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