@article {Marker2017, title = {1.5 Tesla augmented reality navigated interventional magnetic resonance imaging: paravertebral sympathetic plexus injections}, journal = {Diagnostic and Interventional Radiology}, year = {In Press}, month = {01/2017}, author = {David R. Marker and Paweena U-Thainual and Tamas Ungi and Aaron J Flammang and Gabor Fichtinger and Iulian Iordachita and John A Carrino and Jan Fritz} } @article {Marker2016, title = {MR-guided perineural injection of the ganglion impar: technical considerations and feasibility}, journal = {Skeletal Radiology}, year = {2016}, month = {01/2016}, abstract = {

Objective

Perineural ganglion impar injections are used in the management of pelvic pain syndromes; however, there is no consensus regarding the optimal image guidance. Magnetic resonance imaging (MRI) provides high soft tissue contrast and the potential to directly visualize and target the ganglion. The purpose of this study was to assess the feasibility of MR-guided percutaneous perineural ganglion impar injections.

Materials and methods

Six MR-guided ganglion impar injections were performed in six human cadavers. Procedures were performed with a clinical 1.5-Tesla MRI system through a far lateral transgluteus approach. Ganglion impar visibility, distance from the sacrococcygeal joint, number of intermittent MRI control steps required to place the needle, target error between the intended and final needle tip location, inadvertent punctures of non-targeted vulnerable structures, injectant distribution, and procedure time were determined.

Results

The ganglion impar was seen on MRI in 4/6 (66\ \%) of cases and located 0.8\ mm cephalad to 16.3\ mm caudad (average 1.2\ mm caudad) to the midpoint of the sacrococcygeal joint. Needle placement required an average of three MRI control steps (range, 2{\textendash}6). The average target error was 2.2 {\textpm} 2.1\ mm. In 6/6 cases (100\ \%), there was appropriate periganglionic distribution and filling of the presacrococcygeal space. No punctures of non-targeted structures occurred. The median procedure time was 20\ min (range, 12{\textendash}29\ min).

Conclusion

Interventional MRI can visualize and directly target the ganglion impar for accurate needle placement and successful periganglionic injection with the additional benefit of no ionizing radiation exposure to patient and staff. Our results support clinical evaluation.

}, url = {http://dx.doi.org/10.1007/s00256-016-2333-7}, author = {David R. Marker and Paweena U-Thainual and Tamas Ungi and Aaron J Flammang and Gabor Fichtinger and Iulian Iordachita and John A Carrino and Jan Fritz} } @article {Fritz2014, title = {MR-Guided Vertebroplasty With Augmented Reality Image Overlay Navigation}, journal = {Cardiovasc Intervent Radiol}, year = {2014}, month = {04/2014}, doi = {10.1007/s00270-014-0885-2}, author = {Jan Fritz and Paweena U-Thainual and Tamas Ungi and Aaron J Flammang and Sudhir Kathuria and Gabor Fichtinger and Iulian Iordachita and John A Carrino} } @article {Fritz2013a, title = {Augmented reality visualisation using an image overlay system for MR-guided interventions: technical performance of spine injection procedures in human cadavers at 1.5 Tesla}, journal = {European Radiology}, volume = {23}, year = {2013}, month = {01/2013}, pages = {235-245}, issn = {0938-7994}, doi = {10.1007/s00330-012-2569-0}, url = {http://www.ncbi.nlm.nih.gov/pubmed/22797956}, author = {Jan Fritz and Paweena U-Thainual and Tamas Ungi and Aaron J Flammang and Gabor Fichtinger and Iulian Iordachita and John A Carrino} } @article {Fritz2013b, title = {Augmented Reality Visualization Using Image Overlay Technology for MR-Guided Interventions: Cadaveric Bone Biopsy at 1.5 T}, journal = {Investigative Radiology}, volume = {48}, number = {6}, year = {2013}, month = {06/2013}, keywords = {augmented reality, image overlay, interventional MR imaging, MR-guided, MRI guidance, MRI-guided bone biopsy, navigation, osscous biopsy}, url = {http://www.ncbi.nlm.nih.gov/pubmed/23328911}, author = {Jan Fritz and Paweena U-Thainual and Tamas Ungi and Aaron J Flammang and McCarthy, EF. and Gabor Fichtinger and Iulian Iordachita and John A Carrino} } @article {Anand2013a, title = {Mobile Image Overlay System for Image Guided Interventions}, year = {2013}, month = {03/2013}, address = {Washington DC, USA, March 21-23, 2013.}, keywords = {image guided interventions, mobile image overlay, needle placement interventions, percutaneous interventions, static image overlay}, author = {Manjunath Anand and Tamas Ungi and Andras Lasso and Paweena U-Thainual and Jagadeesan Jayender and Jan Fritz and John A Carrino and Ferenc Jolesz and Gabor Fichtinger} } @article {Anand2013c, title = {MOBILE IMAGE OVERLAY SYSTEM (MIOS) FOR IMAGE GUIDED INTERVENTIONS}, year = {2013}, month = {06/2013}, address = {Faculty of Health Sciences, Queen{\textquoteright}s University}, author = {Manjunath Anand and Tamas Ungi and Andras Lasso and Paweena U-Thainual and Jagadeesan Jayender and Jan Fritz and John A Carrino and Ferenc Jolesz and Gabor Fichtinger} } @article {U-Thainual2013a, title = {MR Image Overlay Adjustable Plane System for Musculoskeletal Interventions}, year = {2013}, address = {Toronto, Ontario, Canada, February 4-5, 2013}, keywords = {adjustable plane overlay system, augmented reality system, image overlay, MRI-guided}, author = {Paweena U-Thainual and Jan Fritz and Tamas Ungi and John A Carrino and Gabor Fichtinger and Iulian Iordachita} } @article {U-Thainual2013b, title = {MR image overlay guidance: system evaluation for preclinical use}, journal = {International Journal of Computer Assisted Radiology and Surgery}, volume = {8}, year = {2013}, month = {05/2013}, pages = {365-378}, issn = {1861-6410}, doi = {10.1007/s11548-012-0788-0}, author = {Paweena U-Thainual and Jan Fritz and Choladawan Moonjaita and Tamas Ungi and Aaron J Flammang and John A Carrino and Gabor Fichtinger and Iulian Iordachita} } @conference {Anand2013b, title = {Workspace Analysis and Calibration Method for Mobile Image Overlay System used for Image-Guided Interventions}, booktitle = {The Hamlyn Symposium on Medical Robotics - 2013}, year = {2013}, month = {06/2013}, author = {Manjunath Anand and Tamas Ungi and Andras Lasso and Paweena U-Thainual and Jagadeesan Jayender and Jan Fritz and John A Carrino and Ferenc Jolesz and Gabor Fichtinger} } @article {Fritz2012c, title = {Augmented Reality Visualization Using Image-Overlay for MR-guided Interventions: Performance Assessment of Paravertebral Sympathetic Perineural Injections in Cadavers at 1.5 Tesla}, year = {2012}, month = {06/2012}, pages = {S509-S511}, address = {Pisa, Italy, June 27-30}, author = {Jan Fritz and Paweena U-Thainual and Tamas Ungi and Aaron J Flammang and Gabor Fichtinger and Iulian Iordachita and John A Carrino} } @article {Fritz2012a, title = {Augmented Reality Visualization Using Image-Overlay for MR-Guided Interventions: Accuracy for Lumbar Spinal Procedures with a 1.5-Tesla MRI scanner.}, journal = {American Journal of Roentgenology}, volume = {198}, year = {2012}, month = {03/2012}, pages = {W266-73}, author = {Jan Fritz and Paweena U-Thainual and Tamas Ungi and Aaron J Flammang and Nathan Bongjoon Cho and Gabor Fichtinger and Iulian Iordachita and John A Carrino} } @article {Fritz2012b, title = {Augmented Reality Visualization with Use of Image Overlay Technology for MR Imaging{\textendash}guided Interventions: Assessment of Performance in Cadaveric Shoulder and Hip Arthrography at 1.5 T}, journal = {Radiology}, volume = {265}, number = {1}, year = {2012}, month = {10/2012}, pages = {254-259}, doi = {10.1148/radiol.12112640}, author = {Jan Fritz and Paweena U-Thainual and Tamas Ungi and Aaron J Flammang and Gabor Fichtinger and Iulian Iordachita and John A Carrino} } @article {U-Thainual2012a, title = {MR Image Overlay Guidance: System Evaluation for Clinical Use}, year = {2012}, month = {06/2012}, pages = {S179-S180}, address = {Pisa, Italy, June 27-30}, keywords = {augmented reality, image overlay, needle guidance, percutaneous interventions}, author = {Paweena U-Thainual and Jan Fritz and Choladawan Moonjaita and Tamas Ungi and Aaron J Flammang and John A Carrino and Gabor Fichtinger and Iulian Iordachita} } @conference {Ungi2011b, title = {Augmented Reality Needle Guidance Improves Facet Joint Injection Training}, booktitle = {SPIE Medical Imaging}, volume = {7964}, number = {1}, year = {2011}, month = {03/2011}, pages = {79642E 1-7}, publisher = {SPIE}, organization = {SPIE}, address = {Lake Buena Vista, Florida, USA}, doi = {10.1117/12.877830}, url = {http://link.aip.org/link/?PSI/7964/79642E/1}, author = {Tamas Ungi and Yeo, Caitlin T and Paweena U-Thainual and McGraw, Robert C and Gabor Fichtinger} } @conference {Ungi2011a, title = {Augmented reality training to improve needle-based percutaneous interventions}, booktitle = {ImNO2011 - Imaging Network Ontario Symposium}, year = {2011}, month = {01/2011}, address = {Toronto, ON, Canada, Jan 31-Feb 1}, author = {Tamas Ungi and Paweena U-Thainual and Andras Lasso and Yeo, Caitlin T and McGraw, Robert C and Gabor Fichtinger} } @article {Fritz2011, title = {Augmented reality visualization using image-overlay for MR-guided interventions: assessment of accuracy for lumbar spinal procedures with a 1.5-Tesla MRI scanner}, year = {2011}, month = {09/2011}, address = {Munich, Germany}, author = {Jan Fritz and Paweena U-Thainual and Tamas Ungi and Aaron J Flammang and Nathan Bongjoon Cho and Gabor Fichtinger and Iulian Iordachita and John A Carrino} } @conference {Fritz2011a, title = {Augmented Reality Visualization Using Image-overlay for MR-guided Interventions: Assessment of Performance in Cadaveric Shoulder and Hip Arthrography}, booktitle = {RSNA 97th Scientific Assembly and Annual Meeting}, year = {2011}, month = {07/2012}, address = {Chicago, IL}, doi = {10.1148/radiol.12112640}, url = {http://radiology.rsna.org/content/early/2012/07/24/radiol.12112640.abstract}, author = {Jan Fritz and Paweena U-Thainual and Tamas Ungi and Aaron J Flammang and Nathan Bongjoon Cho and Gabor Fichtinger and Iulian Iordachita and John A Carrino} } @article {Yeo2011, title = {The Effect of Augmented Reality Training on Percutaneous Needle Placement in Spinal Facet Joint Injections}, journal = {IEEE Transactions on Biomedical Engineering}, volume = {58}, year = {2011}, month = {07/2011}, pages = {2031-7}, keywords = {augmented reality, surgical training}, issn = {0018-9294}, doi = {10.1109/TBME.2011.2132131}, url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5739103\&tag=1}, author = {Yeo, Caitlin T and Tamas Ungi and Paweena U-Thainual and Andras Lasso and McGraw, Robert C and Gabor Fichtinger} } @article {U-Thainual2011, title = {MR Image Overlay Adjustable Plane System for Percutaneous Musculoskeletal Interventions}, volume = {4}, year = {2011}, month = {10/2011}, address = {Arlington VA, October 12-13, 2011}, author = {Paweena U-Thainual and Tamas Ungi and John A Carrino and Gabor Fichtinger and Iulian Iordachita} } @article {Ungi2011c, title = {Perk Station image overlay improves training of facet joint injections}, volume = {4}, year = {2011}, month = {10/2011}, pages = {118}, address = {Arlington VA, October 12-13, 2011}, author = {Tamas Ungi and Paweena U-Thainual and Yeo, Caitlin T and Andras Lasso and McGraw, Robert C and Gabor Fichtinger} } @article {U-Thainual2010, title = {Evaluation of accuracy and clinical feasibility of the MR-compatible image overlay}, year = {2010}, address = {Leipzig, Germany, September 24-25, 2010}, keywords = {augmented reality, Image overlay system, MRI-guided}, author = {Paweena U-Thainual and Jan Fritz and Nathan Bongjoon Cho and Tamas Ungi and Segundo, AJM and John A Carrino and Gabor Fichtinger and Lewin, JS and Iulian Iordachita} } @conference {Pompeu-Robinson2010, title = {Validation platform for ultrasound-based monitoring of thermal ablation}, booktitle = {SPIE - Medical Imaging}, year = {2010}, address = {San Diego}, abstract = {

PURPOSE: A ground-truth validation platform was developed to provide spatial correlation between ultrasound (US), temperature measurements and histopathology images to validate US based thermal ablation monitoring methods. METHOD: The test-bed apparatus consists of a container box with integrated fiducial lines. Tissue samples are suspended within the box using agar gel as the fixation medium. Following US imaging, the gel block is sliced and pathology images are acquired. Interactive software segments the fiducials as well as structures of interest in the pathology and US images. The software reconstructs the regions in 3D space and performs analysis and comparison of the features identified from both imaging modalities. RESULTS: The apparatus and software were constructed to meet technical requirements. Tissue samples were contoured, reconstructed and registered in the common coordinate system of fiducials. There was agreement between the sample shapes, but systematic shift of several millimeters was found between histopathology and US. This indicates that during pathology slicing shear forces tend to dislocate the fiducial lines. Softer fiducial lines and harder gel material can eliminate this problem. CONCLUSION: Viability of concept was presented. Despite our straightforward approach, further experimental work is required to optimize all materials and customize software.

}, doi = {10.1117/12.844053}, author = {Alexandra M. Pompeu-Robinson and James Gray and Joshua Marble and Hamed Peikari and Jena Hall and Paweena U-Thainual and Mohammad Aboofazeli and Andras Lasso and Gabor Fichtinger} } @conference {U-Thainual2009a, title = {The Perk Station: Systems design for percutaneous intervention training suite}, booktitle = {Procedings IEEE International Conference on Robotics and Biomimetics ROBIO 2009}, year = {2009}, month = {22{\textendash}25 Feb}, pages = {1693{\textendash}1697}, address = {Bangkok, Thailand}, doi = {10 1109/ROBIO 2009 4913256}, author = {Paweena U-Thainual and Gregory Fischer and Iulian Iordachita and Siddharth Vikal and Gabor Fichtinger} } @article {Vikal2009a, title = {Perk Station-Percutaneous surgery training and performance measurement platform}, journal = {Computerized Medical Imaging and Graphics}, volume = {34}, year = {2009}, month = {05/2009}, pages = {19-32}, abstract = {

MOTIVATION: Image-guided percutaneous (through the skin) needle-based surgery has become part of routine clinical practice in performing procedures such as biopsies, injections, therapeutic implants A novice physician typically performs needle interventions under the supervision of a senior physician; a slow, inherently subjective training process that lacks objective, quantitative assessment of the surgical skill, performance Shortening the learning curve, increasing procedural consistency are important factors in assuring high-quality medical care METHODS: This paper describes a laboratory validation system, called Perk Station, for standardized training, performance measurement under different assistance techniques for needle-based surgical guidance systems The initial goal of the Perk Station is to assess, compare different techniques: 2D image overlay, biplane laser guide, laser protractor, conventional freehand The main focus of this manuscript is the planning, guidance software system developed on the 3D Slicer platform, a free, open source software package designed for visualization, analysis of medical image data RESULTS: The prototype Perk Station has been successfully developed, the associated needle insertion phantoms were built, and the graphical user interface was fully implemented The system was inaugurated in undergraduate teaching, a wide array of outreach activities Initial results, experiences, ongoing activities, future plans are reported

}, doi = {10.1016/j.compmedimag.2009.05.001}, url = {http://dx.doi.org/10.1016/j.compmedimag.2009.05.001}, author = {Siddharth Vikal and Paweena U-Thainual and John A Carrino and Iulian Iordachita and Gregory Fischer and Gabor Fichtinger} } @article {U-Thainual2009, title = {Teaching Aid for Computer-Assisted Surgery}, year = {2009}, author = {Paweena U-Thainual and Iulian Iordachita and Siddharth Vikal and Gabor Fichtinger} } @conference {U-Thainual2008, title = {MR/CT Percutaneous Intervention Training Suite}, booktitle = {7th International Symposium on Interventional MRI}, year = {2008}, pages = {81-85}, author = {Paweena U-Thainual and Gregory Fischer and John A Carrino and Gabor Fichtinger and Iulian Iordachita} } @conference {U-Thainual2008b, title = {The Perk Station: Design of a percutaneous intervention training suite}, booktitle = {20th International Conference of the Society for Medical Innovation and Technology (SMIT)}, year = {2008}, month = {08/2008}, pages = {148-153}, address = {Vienna, Austria, August 28-31}, isbn = {3-902087-25-0}, author = {Paweena U-Thainual and Iulian Iordachita and Gabor Fichtinger} } @conference {U-Thainual2008a, title = {The Perk Station: Portable training station for percutaneous interventions}, booktitle = {Orthopaedic Care Conference}, year = {2008}, author = {Paweena U-Thainual and Siddharth Vikal and Iulian Iordachita and Gabor Fichtinger} } @conference {Ahmidi2008, title = {A System for Performance Analysis of Surgeon Dexterity in Percutaneous Needle-based Interventions}, booktitle = {7th Imaging Symposium of the Imaging Network of Ontario}, year = {2008}, author = {Narges Ahmidi and Paweena U-Thainual and Siddharth Vikal and Parvin Mousavi and Iulian Iordachita and Gabor Fichtinger} } @conference {Fischer2008c, title = {A Training Suite for Image Overlay and Other Needle Insertion Techniques}, booktitle = {2008 MICCAI Workshop - Augmented Environments for Medical Imaging and Computer-Aided Surgery (AMI-ARCS)}, year = {2008}, author = {Gregory Fischer and Iulian Iordachita and Paweena U-Thainual and John A Carrino and Gabor Fichtinger} }