Publications

@article{fichtinger0000_28,

title = {MR Image Overlay Guidance System (MR-IOS): System Evaluation for Clinical Use},

author = {P U-Thainual and J Fritz and C Moonjaita and T Ungi and A Flammang and JA Carrino and G Fichtinger and I Iordachita},

url = {http://perk.cs.queensu.ca/sites/perk.cs.queensu.ca/files/LE-477A_UThainual_Paweena.pdf},

abstract = {Purpose 

A clinical augmented reality guidance system was developed for MR imaging guided musculoskeletal and spine interventions (Magnetic Resonance Image Overlay System, MR-IOS)[1]. The MR-IOS was used in conjunction with a laboratory system “Perk Station Platform, PSP”; a training platform for percutaneous needle based interventions [2]. The purpose of this study was to assess the MR environment compatibility, technical accuracy, technical efficacy and operator performance of the MR-IOS.},

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@article{fichtinger0000g,

title = {DCMQI: An open source library for standardized communication of quantitative image analysis results using DICOM},

author = {Jörg Riesmeier and Andras Lasso and Csaba Pinter and Gabor Fichtinger},

url = {https://core.ac.uk/download/pdf/154882139.pdf},

abstract = {Quantitative analysis of clinical image data is an active area of research that holds promise for precision medicine, early assessment of treatment response, and objective characterization of the disease. Interoperability, data sharing, and the ability to mine the resulting data are of increasing importance, given the explosive growth in the number of quantitative analysis methods being proposed. The Digital Imaging and Communications in Medicine (DICOM) standard is widely adopted for image and metadata in radiology. dcmqi (DICOM for Quantitative Imaging) is a free, open source library that implements conversion of the data stored in commonly used research formats into the standard DICOM representation. dcmqi source code is distributed under BSD-style license. It is freely available as a precompiled binary package for every major operating system, as a Docker image, and as an extension to 3D Slicer. Installation and usage instructions are provided in the GitHub repository at https://github. com/qiicr/dcmqi.},

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@article{fichtinger0000z,

title = {Medical image computing and computer-assisted intervention: 14th international conference; proceedings},

author = {Gabor Fichtinger and Anne Martel and Terry Peters},

url = {https://scholar.google.com/scholar?cluster=13217379728334074159&hl=en&oi=scholarr},

publisher = {Springer},

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pubstate = {published},

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@article{fichtinger0000y,

title = {Using Fuzzy Logics to Determine Optimal Oversampling Factor for Rasterizing RT Structures in DVH Computation},

author = {Csaba Pinter and Tim Olding and L John Schreiner and Gabor Fichtinger},

url = {http://perk.cs.queensu.ca/sites/perkd7.cs.queensu.ca/files/Pinter2016-manuscript.pdf},

abstract = {Purpose 

Rasterizing three-dimensional surfaces into binary image volumes is a frequently performed 10 operation in radiation therapy (RT) workflows. For example, in both the clinic and research, dose-volume histograms (DVH) are used to evaluate the quality of an RT treatment plan. To calculate a DVH, the 3D surfaces (ie RT structures, usually targets and organs at risk) need to be rasterized into binary volumes. The details of this step may significantly influence the output DVH, so special attention is needed when setting up the rasterization parameters. 

Methods 

An effective way of improving the quality of the 15 rasterized volume (ie increasing similarity between that and the original structure) is to apply oversampling on the reference volume to simply increase the resolution of the output structure binary volume. However, increasing the oversampling factor significantly raises the computational and storage cost. This paper proposes a fuzzy-based automatic calculation of the oversampling factor so that higher values are only used in cases where necessary and beneficial. A fuzzy inference system was introduced 20 that applies fuzzy rules to determine an optimal oversampling factor based on two measures: relative structure size and structure complexity. 

Results 

The proposed algorithm was used to automatically},

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@article{fichtinger0000x,

title = {MR Image Overlay: an Augmented Reality System for Needle Guidance},

author = {Gabor Fichtinger},

url = {https://scholar.google.com/scholar?cluster=14037511090116778528&hl=en&oi=scholarr},

abstract = {MRI-guided percutaneous needle-based surgery has become part of routine clinical practice. There are millions of these procedures performed in Canada. The conventional MRI-guided needle intervention is usually performed with the primary goal of navigating a needle to a target while sparing healthy and/or critical structures. Potential limitations of conventional unassisted free-hand needle placement include the physician's ability to align and maintain the correct trajectory and angle toward a target, especially in case of deep targets. In contemporary practice, images are displayed on the operator's 2D console only outside the treatment room, where the physician plans the intervention. Then the physician enters the room, mentally registers the images with the anatomy of the actual patient, and uses hand-eye coordination to execute the planned intervention. Previous concept has been shown and preliminary results discussed from demonstrated MRI-guided needle intervention using an augmented reality 2D image overlay system in a closed configuration 1.5T MRI scanner. However, the limited availability of interventional MR imaging systems and the length of time of MR-guided interventions have been limiting factors in the past. This dissertation addresses topics related to evaluating and developing the 2D augmented reality system, the assistance device for MRI-guided needle interventions. This research effort has primarily focused on developing a new adjustable 2D MR image overlay system and validating the previous 2D image overlay system in the clinical environment. The adjustable system requirement is to overcome the oblique …},

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@article{fichtinger0000v,

title = {Flam, T, 122 Foley, DW, 152 Foster, GP, 262},

author = {GP Frivold and J Alcalde and JL Alcázar and D Alezra and BM Anscher and MS Anscher and K Bae and M Baikadi and S Beriwal and DA Bernard and S Bhatia and A Bhatnagar and JC Blasko and KA Bradley and EC Burdette and RW Byhardt and M Cambeiro and A Cantor and L Chauveinc and JCH Chu and G Cohen and C Concejo and JM Cosset and J Crook and KJM Das and RK Das and NR Datta and J De Los Santos and J Dean and T Deguchi and A Dickler and M Donat and GM Duchesne and BF Dunning and J Eastham and RP Edwards and WMH Eijkenboom and K Elliott and WK Evans and E Falkenberg and C Falkson and C Faul and D Ferry and G Fichtinger and S Firat and C Garrán and R Garza and K Gerszten and C Gillan and MT Gillin and T Gotoh and E Gressen and K Greven and KL Griem and A Gupta and CK Gwede},

url = {https://scholar.google.com/scholar?cluster=13867110131218914908&hl=en&oi=scholarr},

journal = {Heron},

volume = {500},

pages = {118},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{fichtinger0000t,

title = {Distinguished Seminar Series},

author = {Lila Kari and Walter Light Hall and Bill Buxton and Buxton Design Principal and Ming Li and Jonathan Schaeffer},

url = {https://scholar.google.com/scholar?cluster=3578342665849253087&hl=en&oi=scholarr},

abstract = {Internet services offered for human use are suffering abuse by programs ('bots, spiders, scrapers, spammers, etc). We mount a defense against such attacks with CAPTCHAs,completely automatic public Turing tests to tell computers and humans apart.'These are special cases ofhuman interactive proofs'(HIPs), a class of security protocols allowing people easily to identify themselves over networks as members of given groups. I will review the five years of evolution of HIP R&D, highlights of the first NSF HIP workshop, and applications of HIPs now in use and on the horizon.},

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@article{fichtinger0000q,

title = {DEVELOPMENT AND PRELIMINARY EVALUATION OF AN ACTUATED MRI-COMPATIBLE ROBOTIC DEVICE FOR MRI-GUIDED PROSTATE INTERVENTION},

author = {I IORDACHITA and SE SONG and NB CHO and LL WHITCOMB and A KRIEGER and G FICHTINGER and P GUION},

url = {https://scholar.google.com/scholar?cluster=18214167030426789194&hl=en&oi=scholarr},

abstract = {This paper reports the design, development, and magnetic resonance imaging (MRI) compatibility evaluation of an actuated transrectal prostate robot for MRI-guided intervention. The robot employs an actuated needle guide with the goal of reducing interventional procedure times and increasing needle placement accuracy. The design of the robot, employing piezo-ceramic-motor actuated needle guide positioning and manual needle insertion, is reported. Results of a MRI compatibility study show no reduction of MRI image signal-to-noise-ratio (SNR) with the motors disabled and a 40% to 60% reduction in SNR with the motors enabled. The addition of radio-frequency (RF) shielding is shown to significantly reduce image SNR degradation due to the presence of the robotic device.© 2010 IEEE.},

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@article{fichtinger0000e,

title = {LACK OF DIFFERENCE OF COLONIC CURVATURE IN SUPINE VERSUS PRONE PATIENT POSITIONS, IN NORMAL AND HIGH BMI INDIVIDUALS, AS ASSESSED BY QUANTITATIVE ASSESSMENT OF COMPUTED …},

author = {P Tan and J Laframboise and K Barr and H Anvari and T Ungi and G Fichtinger and C Scott and R Bechara and L Hookey},

url = {https://pdfs.semanticscholar.org/3cf9/f8646012156e15a2ca02bcc31781f91c171e.pdf},

abstract = {Background: Dynamic positional changes during colonoscopy are commonly used in clinical practice, in particular moving from side to side. It has been shown to improve both adenoma detection rates as well as cecal intubation times. However, perhaps due to an additional level of inconvenience, there have been few studies comparing the anatomy and changes in colonic curvature when patients are in the prone position, which may help to prevent anterior bowing of the scope, particularly in patients with high body mass index (BMI). 

Aims: To compare both the number of colonic curves and degree of change in curves with patients in supine versus prone positioning during computed tomography colonography (CTC). 

Methods: 75 CTC studies, obtained between January and April 2017 at Hotel Dieu Hospital in Kingston, Ontario, were screened and included based on image quality and adequacy of distention. Per standardized protocol, all patients undergoing CTC are imaged both in supine and prone positioning. Using an automated computer algorithm process developed for this study, curves were identified and measured via centerline points placed digitally through the colonic lumen, and compared between supine and prone patient positioning. Results: 75 colonographies were examined. The mean age was 68 years and 37/75 were male. BMI data was available for 56 patients, with mean BMI 29.4 (SD 5.7). There were no significant differences in total mean degrees of curvature between supine and prone positions [75.3 (SD 13.5) vs. 77.3 (SD 15.3)},

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@article{fichtinger0000h,

title = {Novel Mechanism Segments Anatomical Structures for 3D Printing April 27, 2017},

author = {Csaba Pinter},

url = {https://www.kitware.com/novel-mechanism-segments-anatomical-structures-for-3d-printing/},

abstract = {A fundamental task in most aspects of medical image computing is segmentation, ie, delineation of anatomical structures of interest for further processing and quantification. Segmentation can be manual, it can be semi-automatic (through the initialization of an algorithm with limited input), or it can be fully automatic (through an autonomous algorithm). A multitude of software tools and algorithms exist for each type of segmentation, and segmentation has served as the subject of extensive research in the field of medical image computing. 

Most commonly, three-dimensional (3D) binary volumes (labelmaps) store segmentation results. Each volume simply indicates whether a volumetric element (voxel) is inside or outside of the structure of interest. Three-dimensional binary volumes are optimal for most processing algorithms. To visualize structures, however, surface models are optimal. Instead of a structured grid of voxels, each surface model consists of a point cloud. Triangles connect the point cloud, which a 3D visualization can illustrate.},

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@article{fichtinger0000c,

title = {Medical Robotics},

author = {Russell H Taylor and Arianna Menciassi and Gabor Fichtinger and Paolo Dario},

url = {https://scholar.google.ca/citations?view_op=view_citation&hl=en&user=_KxkI6UAAAAJ&cstart=300&pagesize=100&citation_for_view=_KxkI6UAAAAJ:N4u4nq0IxgcC},

journal = {Systems, Research},

volume = {52},

issue = {6Registration},

pages = {1208},

keywords = {},

pubstate = {published},

tppubtype = {article}

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@article{fichtinger0000d,

title = {Virtual Dissection of the Colon},

author = {Erich Sorantin and Emese Balogh and Anna Vilanova Bartroli and Kalman Palagyi and Laszlo G Nyul and Sven Loncaric and Marko Subasic and Domagoj Kovacevic and Marianna Dudasne-Nagy and Eors Mate and Bela Kari and Gabor Fichtinger and Theodore L DeWeese and Alexandru Patriciu and Attila Tanacs and Dumitru Mazilu and James H Anderson and Ken Masamune and Russel H Taylor and Dan Stoianovici and Attila Kuba and Emese Balogh and Laszlo G Nyul and Alexandre X Falcao and Jayaram K Udupa and Kalman Palagyi and Erich Sorantin and Csongor Halmai and Balazs Erdohelyi and Kalman Palagyi and Laszlo G Nyul and Krisztian Olle and Bernhard Geiger and Franz Lindbichler and Gerhard Friedrich and Karl Kiesler},

url = {https://scholar.google.com/scholar?cluster=955860295717033248&hl=en&oi=scholarr},

journal = {3D Image Processing–Techniques and Clinical Applications},

volume = {21},

pages = {263-273},

publisher = {Springer Verlag},

abstract = {In this paper, we present a new mathematical method that synthesizes normal data sets for quantification of regional myocardium perfusion. In clinical practice, regional myocardial perfusion is often measured with a gamma camera and quantified via circumferential profile analysis. Normal reference profile data is used to increase the accuracy of the clinical interpretations. Our goal is to create reference data from an existing set of archived studies. An iterative mathematical method, based on two statistical hypotheses, was used to generate the study set instead of collecting normal examinations from a healthy population. Clinical validation is based on interpretations by six independent observers. Results of evaluation with synthesized normal data and its validation are presented.},

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@article{fichtinger0000b,

title = {Image registration of multiple medical imaging modalities using a multiple degree-of-freedom-encoded fiducial device},

author = {Gabor Fichtinger and Ameet Jain and Tabish Mustufa and Keenan Wyrobek and Greg Chirikijian and Yu Zhou and Everette C Burdette

},

url = {https://scholar.google.ca/citations?view_op=view_citation&hl=en&user=_KxkI6UAAAAJ&cstart=20&pagesize=80&citation_for_view=_KxkI6UAAAAJ:4fKUyHm3Qg0C},

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@article{Ungi2013e,

title = {Ultrasound Snapshots in Percutaneous Pedicle Screw Placement Navigation: A Feasibility Study},

author = {Tamas Ungi and Eric Moult and Joseph H. Schwab and Gabor Fichtinger},

url = {https://labs.cs.queensu.ca/perklab/wp-content/uploads/sites/3/2024/02/Ungi2013e_WebVersion.pdf},

journal = {Clinical Orthopaedics and Related Research},

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pubstate = {published},

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