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Lemine AS, Ahmad Z, Al-Thani NJ, Hasan A, Bhadra J. Mechanical properties of human hepatic tissues to develop liver-mimicking phantoms for medical applications. Biomech Model Mechanobiol 2024; 23:373-396. [PMID: 38072897 DOI: 10.1007/s10237-023-01785-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 10/17/2023] [Indexed: 03/26/2024]
Abstract
Using liver phantoms for mimicking human tissue in clinical training, disease diagnosis, and treatment planning is a common practice. The fabrication material of the liver phantom should exhibit mechanical properties similar to those of the real liver organ in the human body. This tissue-equivalent material is essential for qualitative and quantitative investigation of the liver mechanisms in producing nutrients, excretion of waste metabolites, and tissue deformity at mechanical stimulus. This paper reviews the mechanical properties of human hepatic tissues to develop liver-mimicking phantoms. These properties include viscosity, elasticity, acoustic impedance, sound speed, and attenuation. The advantages and disadvantages of the most common fabrication materials for developing liver tissue-mimicking phantoms are also highlighted. Such phantoms will give a better insight into the real tissue damage during the disease progression and preservation for transplantation. The liver tissue-mimicking phantom will raise the quality assurance of patient diagnostic and treatment precision and offer a definitive clinical trial data collection.
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Affiliation(s)
- Aicha S Lemine
- Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, 2713, Doha, Qatar
- Qatar University Young Scientists Center (QUYSC), Qatar University, 2713, Doha, Qatar
| | - Zubair Ahmad
- Qatar University Young Scientists Center (QUYSC), Qatar University, 2713, Doha, Qatar
- Center for Advanced Materials (CAM), Qatar University, PO Box 2713, Doha, Qatar
| | - Noora J Al-Thani
- Qatar University Young Scientists Center (QUYSC), Qatar University, 2713, Doha, Qatar
| | - Anwarul Hasan
- Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, 2713, Doha, Qatar
| | - Jolly Bhadra
- Qatar University Young Scientists Center (QUYSC), Qatar University, 2713, Doha, Qatar.
- Center for Advanced Materials (CAM), Qatar University, PO Box 2713, Doha, Qatar.
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Prakash R, Yamamoto KK, Oca SR, Ross W, Codd PJ. Brain-Mimicking Phantom for Photoablation and Visualization. ... INTERNATIONAL SYMPOSIUM ON MEDICAL ROBOTICS. INTERNATIONAL SYMPOSIUM ON MEDICAL ROBOTICS 2023; 2023:10.1109/ismr57123.2023.10130243. [PMID: 37274088 PMCID: PMC10237535 DOI: 10.1109/ismr57123.2023.10130243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
While the use of tissue-mimicking (TM) phantoms has been ubiquitous in surgical robotics, the translation of technology from laboratory experiments to equivalent intraoperative tissue conditions has been a challenge. The increasing use of lasers for surgical tumor resection has introduced the need to develop a modular, low-cost, functionally relevant TM phantom to model the complex laser-tissue interaction. In this paper, a TM phantom with mechanically and thermally similar properties as human brain tissue suited for photoablation studies and subsequent visualization is developed. The proposed study demonstrates the tuned phantom response to laser ablation for fixed laser power, time, and angle. Additionally, the ablated crater profile is visualized using optical coherence tomography (OCT), enabling high-resolution surface profile generation.
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Affiliation(s)
- Ravi Prakash
- Department of Mechanical Engineering and Materials Science, Duke University
| | - Kent K. Yamamoto
- Department of Mechanical Engineering and Materials Science, Duke University
| | - Siobhan R. Oca
- Department of Mechanical Engineering and Materials Science, Duke University
| | - Weston Ross
- Department of Neurosurgery, Duke University School of Medicine
| | - Patrick J. Codd
- Department of Mechanical Engineering and Materials Science, Duke University
- Department of Neurosurgery, Duke University School of Medicine
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Amiri SA, Berckel PV, Lai M, Dankelman J, Hendriks BHW. Tissue-mimicking phantom materials with tunable optical properties suitable for assessment of diffuse reflectance spectroscopy during electrosurgery. BIOMEDICAL OPTICS EXPRESS 2022; 13:2616-2643. [PMID: 35774339 PMCID: PMC9203083 DOI: 10.1364/boe.449637] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 02/08/2022] [Accepted: 02/09/2022] [Indexed: 06/15/2023]
Abstract
Emerging intraoperative tumor margin assessment techniques require the development of more complex and reliable organ phantoms to assess the performance of the technique before its translation into the clinic. In this work, electrically conductive tissue-mimicking materials (TMMs) based on fat, water and agar/gelatin were produced with tunable optical properties. The composition of the phantoms allowed for the assessment of tumor margins using diffuse reflectance spectroscopy, as the fat/water ratio served as a discriminating factor between the healthy and malignant tissue. Moreover, the possibility of using polyvinyl alcohol (PVA) or transglutaminase in combination with fat, water and gelatin for developing TMMs was studied. The diffuse spectral response of the developed phantom materials had a good match with the spectral response of porcine muscle and adipose tissue, as well as in vitro human breast tissue. Using the developed recipe, anatomically relevant heterogeneous breast phantoms representing the optical properties of different layers of the human breast were fabricated using 3D-printed molds. These TMMs can be used for further development of phantoms applicable for simulating the realistic breast conserving surgery workflow in order to evaluate the intraoperative optical-based tumor margin assessment techniques during electrosurgery.
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Affiliation(s)
- Sara Azizian Amiri
- Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, The Netherlands
| | - Pieter Van Berckel
- Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, The Netherlands
| | - Marco Lai
- Philips Research, IGT & US Devices and Systems Department, Eindhoven, The Netherlands
- Eindhoven University of Technology (TU/e), Eindhoven, The Netherlands
| | - Jenny Dankelman
- Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, The Netherlands
| | - Benno H. W. Hendriks
- Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, The Netherlands
- Philips Research, IGT & US Devices and Systems Department, Eindhoven, The Netherlands
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Sadaphal V, Prasad B, Kay W, Nehring L, Nyugen T, Tepper J, Tanner M, Williams D, Ashton N, Greenberg DE, Chopra R. Feasibility of heating metal implants with alternating magnetic fields (AMF) in scaled up models. Int J Hyperthermia 2021; 39:81-96. [DOI: 10.1080/02656736.2021.2011434] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Affiliation(s)
- Varun Sadaphal
- Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Bibin Prasad
- Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Walker Kay
- Department of Orthopedics, University of Utah, Salt Lake City, UT, USA
| | - Lisa Nehring
- Department of Orthopedics, University of Utah, Salt Lake City, UT, USA
| | - Trung Nyugen
- Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - John Tepper
- Solenic Medical, Inc., College Station, TX, USA
| | | | - Dustin Williams
- Department of Orthopedics, University of Utah, Salt Lake City, UT, USA
- Department of Pathology, University of Utah, Salt Lake City, UT, USA
- Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, USA
- Department of Physical Medicine and Rehabilitation, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Nicholas Ashton
- Department of Orthopedics, University of Utah, Salt Lake City, UT, USA
| | - David E. Greenberg
- Department of Microbiology, UT Southwestern Medical Center, Dallas, TX, USA
- Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX, USA
| | - Rajiv Chopra
- Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA
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In Situ Visualization for 3D Ultrasound-Guided Interventions with Augmented Reality Headset. Bioengineering (Basel) 2021; 8:bioengineering8100131. [PMID: 34677204 PMCID: PMC8533537 DOI: 10.3390/bioengineering8100131] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 09/16/2021] [Accepted: 09/21/2021] [Indexed: 12/03/2022] Open
Abstract
Augmented Reality (AR) headsets have become the most ergonomic and efficient visualization devices to support complex manual tasks performed under direct vision. Their ability to provide hands-free interaction with the augmented scene makes them perfect for manual procedures such as surgery. This study demonstrates the reliability of an AR head-mounted display (HMD), conceived for surgical guidance, in navigating in-depth high-precision manual tasks guided by a 3D ultrasound imaging system. The integration between the AR visualization system and the ultrasound imaging system provides the surgeon with real-time intra-operative information on unexposed soft tissues that are spatially registered with the surrounding anatomic structures. The efficacy of the AR guiding system was quantitatively assessed with an in vitro study simulating a biopsy intervention aimed at determining the level of accuracy achievable. In the experiments, 10 subjects were asked to perform the biopsy on four spherical lesions of decreasing sizes (10, 7, 5, and 3 mm). The experimental results showed that 80% of the subjects were able to successfully perform the biopsy on the 5 mm lesion, with a 2.5 mm system accuracy. The results confirmed that the proposed integrated system can be used for navigation during in-depth high-precision manual tasks.
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Skyrman S, Lai M, Edström E, Burström G, Förander P, Homan R, Kor F, Holthuizen R, Hendriks BHW, Persson O, Elmi-Terander A. Augmented reality navigation for cranial biopsy and external ventricular drain insertion. Neurosurg Focus 2021; 51:E7. [PMID: 34333469 DOI: 10.3171/2021.5.focus20813] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 05/17/2021] [Indexed: 11/06/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the accuracy (deviation from the target or intended path) and efficacy (insertion time) of an augmented reality surgical navigation (ARSN) system for insertion of biopsy needles and external ventricular drains (EVDs), two common neurosurgical procedures that require high precision. METHODS The hybrid operating room-based ARSN system, comprising a robotic C-arm with intraoperative cone-beam CT (CBCT) and integrated video tracking of the patient and instruments using nonobtrusive adhesive optical markers, was used. A 3D-printed skull phantom with a realistic gelatinous brain model containing air-filled ventricles and 2-mm spherical biopsy targets was obtained. After initial CBCT acquisition for target registration and planning, ARSN was used for 30 cranial biopsies and 10 EVD insertions. Needle positions were verified by CBCT. RESULTS The mean accuracy of the biopsy needle insertions (n = 30) was 0.8 mm ± 0.43 mm. The median path length was 39 mm (range 16-104 mm) and did not correlate to accuracy (p = 0.15). The median device insertion time was 149 seconds (range 87-233 seconds). The mean accuracy for the EVD insertions (n = 10) was 2.9 mm ± 0.8 mm at the tip with a 0.7° ± 0.5° angular deviation compared with the planned path, and the median insertion time was 188 seconds (range 135-400 seconds). CONCLUSIONS This study demonstrated that ARSN can be used for navigation of percutaneous cranial biopsies and EVDs with high accuracy and efficacy.
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Affiliation(s)
- Simon Skyrman
- 1Department of Neurosurgery, Karolinska University Hospital, and Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Marco Lai
- 2Philips Research, High Tech Campus 34, Eindhoven.,3Eindhoven University of Technology (TU/e), Eindhoven
| | - Erik Edström
- 1Department of Neurosurgery, Karolinska University Hospital, and Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Gustav Burström
- 1Department of Neurosurgery, Karolinska University Hospital, and Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Petter Förander
- 1Department of Neurosurgery, Karolinska University Hospital, and Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | | | - Flip Kor
- 5Department of Biomechanical Engineering, Delft University of Technology, Delft, The Netherlands
| | | | - Benno H W Hendriks
- 2Philips Research, High Tech Campus 34, Eindhoven.,5Department of Biomechanical Engineering, Delft University of Technology, Delft, The Netherlands
| | - Oscar Persson
- 1Department of Neurosurgery, Karolinska University Hospital, and Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Adrian Elmi-Terander
- 1Department of Neurosurgery, Karolinska University Hospital, and Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
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Brzozowski P, Penev KI, Mequanint K. Gellan gum gel tissue phantoms and gel dosimeters with tunable electrical, mechanical and dosimetric properties. Int J Biol Macromol 2021; 180:332-338. [PMID: 33722624 DOI: 10.1016/j.ijbiomac.2021.03.047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 02/16/2021] [Accepted: 03/09/2021] [Indexed: 10/21/2022]
Abstract
Gellan gum gels have been proposed as tissue- and water-mimicking materials (phantoms) applied in medical imaging and radiotherapy dosimetry. Phantoms often require ionic additives to induce desirable electrical conductivity, resistance to biological spoilage, and radical scavenging properties. However, gellan gum is strongly crosslinked by the typically used sodium salts, forming difficult-to-work with gels with reduced optical clarity. Herein we investigated lithium and tetramethylammonium chloride to induce the required electrical conductivity while maintaining optical clarity; lithium formate and methylparaben were used as a radical scavenger and antimicrobial additive, respectively. Using a multifactorial design of experiments, we studied and modeled the electrical and mechanical properties and liquid expulsion (syneresis) properties of the gels. Finally, by the addition of a radiation-sensitive tetrazolium salt, dosimeters with favorable properties were produced. The results described herein may be used to prepare tissue phantoms and dosimeters with tuned electrical, mechanical, and dosimetric properties.
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Affiliation(s)
- Pawel Brzozowski
- School of Biomedical Engineering, The University of Western Ontario, London, Canada
| | - Kalin I Penev
- Department of Chemical and Biomedical Engineering, The University of Western Ontario, London, Canada
| | - Kibret Mequanint
- School of Biomedical Engineering, The University of Western Ontario, London, Canada; Department of Chemical and Biomedical Engineering, The University of Western Ontario, London, Canada.
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Cortela GA, Negreira CA, Pereira WCA. Durability study of a gellan gum-based tissue-mimicking phantom for ultrasonic thermal therapy. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2020; 147:1531. [PMID: 32237853 DOI: 10.1121/10.0000813] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 02/12/2020] [Indexed: 06/11/2023]
Abstract
Stability and duration of ultrasonic phantoms are still subjects of research. This work presents a tissue-mimicking material (TMM) to evaluate high-intensity therapeutic ultrasound (HITU) devices, composed of gellan gum (matrix), microparticles (scatterers), and chemicals. The ultrasonic velocity and attenuation coefficient were characterized as a function of temperature (range 20 °C-85 °C). The nonlinear parameter B/A was determined by the finite amplitude insertion substitution (FAIS) method, and the shear modulus was determined by a transient elastography technique. The thermal conductivity and specific heat were determined by the line source method. The attenuation was stable for 60 days, and in an almost linear frequency dependence (0.51f0.96 dB cm-1), at 20 °C (1-10 MHz). All other evaluated physical parameters are also close to typical soft tissue values. Longitudinal ultrasonic velocities were between 1.49 and 1.75 mm μs-1, the B/A parameter was 7.8 at 30 °C, and Young's modulus was 23.4 kPa. The thermal conductivity and specific heat values were 0.7 W(m K)-1 and 4.7 kJ(kg K)-1, respectively. Consistent temperature increases and thermal doses occurred under identical HITU exposures. Low cost, longevity, thermal stability, and thermal repeatability make TMM an excellent material for ultrasonic thermal applications. The TMM developed has the potential to assess the efficacy of hyperthermia devices and could be used to adjust the ultrasonic emission of HITU devices.
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Affiliation(s)
- Guillermo A Cortela
- Institute of Physics, Faculty of Sciences, Universidad de la Republica Montevideo, Iguá 4225, 11400, Montevideo, Uruguay
| | - Carlos A Negreira
- Institute of Physics, Faculty of Sciences, Universidad de la Republica Montevideo, Iguá 4225, 11400, Montevideo, Uruguay
| | - Wagner C A Pereira
- Biomedical Engineering Program-COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Role of Simulations in the Treatment Planning of Radiofrequency Hyperthermia Therapy in Clinics. JOURNAL OF ONCOLOGY 2019; 2019:9685476. [PMID: 31558904 PMCID: PMC6735211 DOI: 10.1155/2019/9685476] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 07/20/2019] [Accepted: 07/28/2019] [Indexed: 12/26/2022]
Abstract
Hyperthermia therapy is a treatment modality in which tumor temperatures are elevated to higher temperatures to cause damage to cancerous tissues. Numerical simulations are integral in the development of hyperthermia treatment systems and in clinical treatment planning. In this study, simulations in radiofrequency hyperthermia therapy are reviewed in terms of their technical development and clinical aspects for effective clinical use. This review offers an overview of mathematical models and the importance of tissue properties; locoregional mild hyperthermia therapy, including phantom and realistic human anatomy models; phase array systems; tissue damage; thermal dose analysis; and thermoradiotherapy planning. This review details the improvements in numerical approaches in treatment planning and their application for effective clinical use. Furthermore, the modeling of thermoradiotherapy planning, which can be integrated with radiotherapy to provide combined hyperthermia and radiotherapy treatment planning strategies, are also discussed. This review may contribute to the effective development of thermoradiotherapy planning in clinics.
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Javan R, Ellenbogen AL, Greek N, Haji-Momenian S. A prototype assembled 3D-printed phantom of the glenohumeral joint for fluoroscopic-guided shoulder arthrography. Skeletal Radiol 2019; 48:791-802. [PMID: 29948036 DOI: 10.1007/s00256-018-2979-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Revised: 05/07/2018] [Accepted: 05/14/2018] [Indexed: 02/02/2023]
Abstract
PURPOSE To describe the methodology of constructing a three-dimensional (3D) printed model of the glenohumeral joint, to serve as an interventional phantom for fluoroscopy-guided shoulder arthrography training. MATERIALS AND METHODS The osseous structures, intra-articular space and skin surface of the shoulder were digitally extracted as separate 3D meshes from a normal CT arthrogram of the shoulder, using commercially available software. The osseous structures were 3D-printed in gypsum, a fluoroscopically radiopaque mineral, using binder jet technology. The joint capsule was 3D printed with rubber-like TangoPlus material, using PolyJet technology. The capsule was secured to the humeral head and glenoid to create a sealed intra-articular space. A polyamide mold of the skin was printed using selective laser sintering. The joint was stabilized inside the mold, and the surrounding soft tissues were cast in silicone of varying densities. Fluoroscopically-guided shoulder arthrography was performed using anterior, posterior, and rotator interval approaches. CT arthrographic imaging of the phantom was also performed. RESULTS A life-size phantom of the glenohumeral joint was constructed. The radiopaque osseous structures replicated in-vivo osseous corticomedullary differentiation, with dense cortical bone and less dense medullary cancellous bone. The glenoid labrum was successfully integrated into the printed capsule, and visualized on CT arthrography. The phantom was repeatedly used to perform shoulder arthrography using all three conventional approaches, and simulated the in vivo challenges of needle guidance. CONCLUSIONS 3D printing of a complex capsule, such as the glenohumeral joint, is possible with this technique. Such a model can serve as a valuable training tool.
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Affiliation(s)
- Ramin Javan
- Department of Radiology, George Washington University Hospital, 900 23rd St NW, Suite G2092, Washington, DC, 20037, USA.
| | - Amy L Ellenbogen
- Department of Radiology, George Washington University Hospital, 900 23rd St NW, Suite G2092, Washington, DC, 20037, USA
| | - Nicholas Greek
- Clinical Learning and Simulation Skills (CLASS) Center, George Washington University School of Medicine, 2300 I (Eye) Street, NW, Ross Hall 405, Washington, DC, USA
| | - Shawn Haji-Momenian
- Department of Radiology, George Washington University Hospital, 900 23rd St NW, Suite G2092, Washington, DC, 20037, USA
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Brzozowski P, Penev KI, Martinez FM, Scholl TJ, Mequanint K. Gellan gum-based gels with tunable relaxation properties for MRI phantoms. Magn Reson Imaging 2019; 57:40-49. [DOI: 10.1016/j.mri.2018.10.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 10/26/2018] [Accepted: 10/27/2018] [Indexed: 11/16/2022]
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Carolus A, Hesse M, Rudak B, Weihe S, Brenke C. Development of a brain simulator for intracranial targeting: Technical note. J Clin Neurosci 2018; 59:378-383. [PMID: 30377042 DOI: 10.1016/j.jocn.2018.10.060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 10/07/2018] [Indexed: 11/26/2022]
Abstract
Learning and enhancing of manual skills in the field of neurosurgery requires an intensive training which can be maintained by using virtual reality (VR)-based or physical model (PM)-based simulators. However, both simulator types are limited to one specific intracranial procedure, e.g. the application of an external ventricular drainage (EVD), and they do not provide any accuracy verification. We present a brain simulator which consists of a 3D human skull model having five electroconductive balls in its interior. The installed balls represent intracranial target points providing various accuracy problems in neuronavigation. They are electrically contacted to lamps getting an optical signal by touching them with a current-carrying target tool. The simulator fulfills two requirements: First, it can prove the accuracy of navigation systems and algorithms. Second, it allows becoming familiar with a navigation system's application in an ex vivo setting. It could be a helpful device in neurosurgical skills labs.
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Affiliation(s)
- A Carolus
- Department of Neurosurgery, University Hospital Knappschaftskrankenhaus Bochum, Ruhr-University Bochum, Bochum, Germany.
| | - M Hesse
- DMD GmbH Digital Medical Design, Dortmund, Germany; IMDI GmbH - Institute for Medical and Dental Innovations, Affiliated Institute of the University Witten/Herdecke, Witten, Germany
| | - B Rudak
- DMD GmbH Digital Medical Design, Dortmund, Germany; IMDI GmbH - Institute for Medical and Dental Innovations, Affiliated Institute of the University Witten/Herdecke, Witten, Germany
| | - S Weihe
- DMD GmbH Digital Medical Design, Dortmund, Germany; IMDI GmbH - Institute for Medical and Dental Innovations, Affiliated Institute of the University Witten/Herdecke, Witten, Germany
| | - C Brenke
- Department of Neurosurgery, University Hospital Knappschaftskrankenhaus Bochum, Ruhr-University Bochum, Bochum, Germany
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Zhang H, Hou K, Chen J, Dyer BA, Chen JC, Liu X, Zhang F, Rong Y, Qiu J. Fabrication of an anthropomorphic heterogeneous mouse phantom for multimodality medical imaging. Phys Med Biol 2018; 63:195011. [PMID: 30183686 DOI: 10.1088/1361-6560/aadf2b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
This work presents a comprehensive methodology for constructing a tissue equivalent mouse phantom using image modeling and 3D printing technology. The phantom can be used in multimodality imaging and irradiation experiments, quality control, and management. Computed tomography (CT) images of a mouse were acquired and imported into 3D modeling software. A skeleton and skin shell models were segmented in the modeling software and manufactured using 3D printing technology. The bone model was constructed with VERO-WHITE printing material with additional ingredients, including a photosensitive resin, polyurethane epoxy resin, and acrylate. Acrylonitrile butadiene styrene resin material was used to construct the skin shell. The skin shell was attached to the skeleton and filled with a specially formulated gel to act as a soft tissue substitute. The gel consisted of agarose, micro-pearl powder, sodium chloride, and magnevist solution (gadopentetate dimeglumine). A micro-container filled with 18F-fluorodeoxyglucose (18F-FDG) radioactive tracer was placed in the abdomen for micro and human positron emission tomography (PET)/CT imaging. The mouse phantom had tissue equivalency in dose attenuation with x-rays and relaxation times with magnetic resonance imaging (MRI). The CT Hounsfield Unit (HU) range for the gel soft tissue material was 31-36 HU. The 3D printed bone mimetic material had equivalent tissue/bone contrast compared with in vivo mouse measurements with a mean value of 130 ± 10 HU. At different magnetic field strengths, the T 1 relaxation time of the soft tissue was 382.75-506.48 ms, and T 2 was 51.11-70.76 ms. 18F-FDG tracer could be clearly observed in PET imaging. The 3D printed mouse phantom was successfully constructed with tissue-equivalent materials. Our model can be used for CT, MRI, and PET as a standard device for small-animal imaging and quality control.
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Affiliation(s)
- Haozhao Zhang
- Medical Engineering and Technology Research Center, Taishan Medical University, Taian, Shandong, 271016, People's Republic of China. HZ and KH contributed equally to this work
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Li P, Yang Z, Jiang S. Tissue mimicking materials in image-guided needle-based interventions: A review. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 93:1116-1131. [PMID: 30274042 DOI: 10.1016/j.msec.2018.09.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 08/25/2018] [Accepted: 09/07/2018] [Indexed: 12/17/2022]
Abstract
Image-guided interventions are widely employed in clinical medicine, which brings significant revolution in healthcare in recent years. However, it is impossible for medical trainees to experience the image-guided interventions physically in patients due to the lack of certificated skills. Therefore, training phantoms, which are normally tissue mimicking materials, are widely used in medical research, training, and quality assurance. This review focuses on the tissue mimicking materials used in image-guided needle-based interventions. In this case, we need to investigate the microstructure characteristics and mechanical properties (for needle intervention), optical properties and acoustical properties (for imaging) of these training phantoms to compare with the related properties of human real tissues. The widely used base materials, additives and the corresponding concentrations of the training phantoms are summarized from the literatures in recent ten years. The microstructure characteristics, mechanical behavior, optical properties and acoustical properties of the tissue mimicking materials are investigated, accompanied with the common experimental methods, apparatus and theoretical algorithm. The influence of the concentrations of the base materials and additives on these characteristics are compared and classified. In this review, we assess a comprehensive overview of the existing techniques with the main accomplishments, and limitations as well as recommendations for tissue mimicking materials used in image-guided needle-based interventions.
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Affiliation(s)
- Pan Li
- Centre for Advanced Mechanisms and Robotics, School of Mechanical Engineering, Tianjin University, No. 135, Yaguan Road, Jinnan District, Tianjin City 300354, China
| | - Zhiyong Yang
- Centre for Advanced Mechanisms and Robotics, School of Mechanical Engineering, Tianjin University, No. 135, Yaguan Road, Jinnan District, Tianjin City 300354, China
| | - Shan Jiang
- Centre for Advanced Mechanisms and Robotics, School of Mechanical Engineering, Tianjin University, No. 135, Yaguan Road, Jinnan District, Tianjin City 300354, China.
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Ma M, Zhang Y, Gu N. Estimation the tumor temperature in magnetic nanoparticle hyperthermia by infrared thermography: Phantom and numerical studies. J Therm Biol 2018; 76:89-94. [DOI: 10.1016/j.jtherbio.2018.07.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 07/06/2018] [Accepted: 07/09/2018] [Indexed: 10/28/2022]
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16
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Wu H, Song L, Chen L, Zhang W, Chen Y, Zang F, Chen H, Ma M, Gu N, Zhang Y. Injectable magnetic supramolecular hydrogel with magnetocaloric liquid-conformal property prevents post-operative recurrence in a breast cancer model. Acta Biomater 2018; 74:302-311. [PMID: 29729897 DOI: 10.1016/j.actbio.2018.04.052] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Revised: 04/25/2018] [Accepted: 04/26/2018] [Indexed: 10/17/2022]
Abstract
Locoregional recurrence of breast cancer after tumor resection represents several clinical challenges. Here, we demonstrate that co-delivery of chemotherapy and thermotherapeutic agents by a magnetic supramolecular hydrogel (MSH) following tumor resection prevents tumor recurrence in a breast cancer mouse model. The self-assembled MSH was designed through the partial inclusion complexation associated with the threading of α-CD on the copolymer moieties on the surface of the PEGylated iron oxide (Fe3O4) nanoparticles, which enables shear-thinning injection and controllable thermoreversible gel-sol transition. MSH was injected to the postoperative wound uniformly, which became mobile and perfect match with irregular cavity without blind angle due to the magnetocaloric gel-sol transition when exposed to alternating current magnetic field (ACMF). The magnetic nanoparticle-mediated induction heat during the gel-sol transition process caused the triggered release of dual-encapsulated chemotherapeutic drugs and provided an effect of thermally induced cell damage. The hierarchical structure of the MSH ensured that both hydrophobic and hydrophilic drugs can be loaded and consecutively delivered with different release curves. The hydrogel nanocomposite might provide a potential locally therapeutic approach for the precise treatment of locoregional recurrence of cancer. STATEMENT OF SIGNIFICANCE Tumor recurrence after resection represents several clinical challenges. In this study, we prepared shear-thinning injectable magnetic supramolecular hydrogel (MSH) and demonstrated their therapeutic applications in preventing the post-operative recurrence of breast cancer with facile synthesis and minimally invasive implantation in vivo. MSH was injected to the postoperative wound uniformly, which become mobile and perfect match with irregular cavity without blind angle through magnetocaloric gel-sol transition when exposed to ACMF. The magnetic nanoparticles mediated induction heat during the gel-sol transition process caused the triggered release of dual-encapsulated chemotherapeutic drugs as well as thermally induced cell damage. This study demonstrates that MSH with the controlled administration of combined thermo-chemotherapy exhibit great superiority in terms of preventing post-operation cancer relapse.
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Mirbeik-Sabzevari A, Tavassolian N. Ultrawideband, Stable Normal and Cancer Skin Tissue Phantoms for Millimeter-Wave Skin Cancer Imaging. IEEE Trans Biomed Eng 2018; 66:176-186. [PMID: 29993432 DOI: 10.1109/tbme.2018.2828311] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This work introduces new, stable, and broadband skin-equivalent semisolid phantoms for mimicking interactions of millimeter waves with the human skin and skin tumors. Realistic skin phantoms serve as an invaluable tool for exploring the feasibility of new technologies and improving design concepts related to millimeter-wave skin cancer detection methods. Normal and malignant skin tissues are separately mimicked by using appropriate mixtures of deionized water, oil, gelatin powder, formaldehyde, TX-150 (a gelling agent, widely referred to as "super stuff"), and detergent. The dielectric properties of the phantoms are characterized over the frequency band of 0.5-50 GHz using a slim-form open-ended coaxial probe in conjunction with a millimeter-wave vector network analyzer. The measured permittivity results show excellent match with ex vivo, fresh skin (both normal and malignant) permittivities determined in our prior work over the entire frequency range. This work results in the closest match among all phantoms reported in the literature to surrogate human skin tissues. The stability of dielectric properties over time is also investigated. The phantoms demonstrate long-term stability (up to 7 months was investigated). In addition, the penetration depth of millimeter waves into normal and malignant skin phantoms is calculated. It is determined that millimeter waves penetrate the human skin deep enough (0.6 mm on average at 50 GHz) to affect the majority of the epidermis and dermis skin structures.
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18
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Malukhin K, Ehmann K. Mathematical Modeling and Virtual Reality Simulation of Surgical Tool Interactions With Soft Tissue: A Review and Prospective. ACTA ACUST UNITED AC 2018. [DOI: 10.1115/1.4039417] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This is an informed assessment of the state of the art and an extensive inventory of modeling approaches and methods for soft tissue/medical cutting tool interaction and of the associated medical processes and phenomena. Modeling and simulation through numerical, theoretical, computational, experimental, and other methods was discussed in comprehensive review sections each of which is concluded with a plausible prospective discussion biased toward the development of so-called virtual reality (VR) simulator environments. The finalized prospective section reflects on the future demands in the area of soft tissue cutting modeling and simulation mostly from a conceptual angle with emphasis on VR development requirements including real-time VR simulator response, cost-effective “close-to-reality” VR implementations, and other demands. The review sections that serve as the basis for the suggested prospective needs are categorized based on: (1) Major VR simulator applications including virtual surgery education, training, operation planning, intraoperative simulation, image-guided surgery, etc. and VR simulator types, e.g., generic, patient-specific and surgery-specific and (2) Available numerical, theoretical, and computational methods in terms of robustness, time effectiveness, computational cost, error control, and accuracy of modeling of certain types of virtual surgical interventions and their experimental validation, geared toward ethically driven artificial “phantom” tissue-based approaches. Digital data processing methods used in modeling of various feedback modalities in VR environments are also discussed.
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Affiliation(s)
- Kostyantyn Malukhin
- McCormick School of Engineering, Mechanical Engineering Department, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 e-mail:
| | - Kornel Ehmann
- Fellow ASME McCormick School of Engineering, Mechanical Engineering Department, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 e-mail:
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19
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Ventriculostomy Simulation in Neurosurgery. COMPREHENSIVE HEALTHCARE SIMULATION: NEUROSURGERY 2018. [DOI: 10.1007/978-3-319-75583-0_2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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20
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Li H, Chen RK, Tang Y, Meurer W, Shih AJ. An experimental study and finite element modeling of head and neck cooling for brain hypothermia. J Therm Biol 2017; 71:99-111. [PMID: 29301706 DOI: 10.1016/j.jtherbio.2017.10.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 10/31/2017] [Accepted: 10/31/2017] [Indexed: 11/28/2022]
Abstract
Reducing brain temperature by head and neck cooling is likely to be the protective treatment for humans when subjects to sudden cardiac arrest. This study develops the experimental validation model and finite element modeling (FEM) to study the head and neck cooling separately, which can induce therapeutic hypothermia focused on the brain. Anatomically accurate geometries based on CT images of the skull and carotid artery are utilized to find the 3D geometry for FEM to analyze the temperature distributions and 3D-printing to build the physical model for experiment. The results show that FEM predicted and experimentally measured temperatures have good agreement, which can be used to predict the temporal and spatial temperature distributions of the tissue and blood during the head and neck cooling process. Effects of boundary condition, perfusion, blood flow rate, and size of cooling area are studied. For head cooling, the cooling penetration depth is greatly depending on the blood perfusion in the brain. In the normal blood flow condition, the neck internal carotid artery temperature is decreased only by about 0.13°C after 60min of hypothermia. In an ischemic (low blood flow rate) condition, such temperature can be decreased by about 1.0°C. In conclusion, decreasing the blood perfusion and metabolic reduction factor could be more beneficial to cool the core zone. The results also suggest that more SBC researches should be explored, such as the optimization of simulation and experimental models, and to perform the experiment on human subjects.
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Affiliation(s)
- Hui Li
- Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA; Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China; Electronic Paper Display Institute, South China Normal University, Guangzhou 510006, China.
| | - Roland K Chen
- Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920, USA
| | - Yong Tang
- Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
| | - William Meurer
- Department of Emergency Medicine, Department of Neurology, Michigan Center for Integrative Research in Critical Care, University of Michigan Health System, Ann Arbor, MI 48109-5303, USA
| | - Albert J Shih
- Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
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21
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Chopra R, Shaikh S, Chatzinoff Y, Munaweera I, Cheng B, Daly SM, Xi Y, Bing C, Burns D, Greenberg DE. Employing high-frequency alternating magnetic fields for the non-invasive treatment of prosthetic joint infections. Sci Rep 2017; 7:7520. [PMID: 28790407 PMCID: PMC5548742 DOI: 10.1038/s41598-017-07321-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 06/29/2017] [Indexed: 11/16/2022] Open
Abstract
Treatment of prosthetic joint infection (PJI) usually requires surgical replacement of the infected joint and weeks of antibiotic therapy, due to the formation of biofilm. We introduce a non-invasive method for thermal destruction of biofilm on metallic implants using high-frequency (>100 kHz) alternating magnetic fields (AMF). In vitro investigations demonstrate a >5-log reduction in bacterial counts after 5 minutes of AMF exposure. Confocal and scanning electron microscopy confirm removal of biofilm matrix components within 1 minute of AMF exposure, and combination studies of antibiotics and AMF demonstrate a 5-log increase in the sensitivity of Pseudomonas aeruginosa to ciprofloxacin. Finite element analysis (FEA) simulations demonstrate that intermittent AMF exposures can achieve uniform surface heating of a prosthetic knee joint. In vivo studies confirm thermal damage is confined to a localized region (<2 mm) around the implant, and safety can be achieved using acoustic monitoring for the presence of surface boiling. These initial studies support the hypothesis that AMF exposures can eradicate biofilm on metal implants, and may enhance the effectiveness of conventional antibiotics.
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Affiliation(s)
- Rajiv Chopra
- Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA.
- Advanced Imaging Research Center, UT Southwestern Medical Center, Dallas, TX, USA.
| | - Sumbul Shaikh
- Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Yonatan Chatzinoff
- Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Imalka Munaweera
- Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Bingbing Cheng
- Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Seth M Daly
- Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX, USA
| | - Yin Xi
- Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Chenchen Bing
- Department of Radiology, UT Southwestern Medical Center, Dallas, TX, USA
| | - Dennis Burns
- Department of Pathology, UT Southwestern Medical Center, Dallas, TX, USA
| | - David E Greenberg
- Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX, USA
- Department of Microbiology, UT Southwestern Medical Center, Dallas, TX, USA
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22
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Bui L, Aleid A, Alassaf A, Wilson OC, Raub CB, Frenkel V. Development of a custom biological scaffold for investigating ultrasound-mediated intracellular delivery. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 70:461-470. [DOI: 10.1016/j.msec.2016.09.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 08/08/2016] [Accepted: 09/12/2016] [Indexed: 01/15/2023]
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Marshall SP, Patel PR, Shih AJ, Chestek CA. Effects of geometry and material on the insertion of very small neural electrode. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2016; 2016:2784-2788. [PMID: 28268896 DOI: 10.1109/embc.2016.7591308] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
For neural probes to be used chronically for years in the human body, they must provoke minimal scarring. Recently, a number of groups have reported substantially reduced scar tissue using cellular scale electrodes below 15 μm in size. This size scale is accessible to manufacturing techniques, but can be very difficult to insert in the brain for most common electrode materials. In this study, we explore the design space available to cellular scale electrodes that will self-insert into the brain. First a mathematical model is developed using beam buckling equations for different materials and geometries. Buckling mode was found to be one fixed and one hinged end resulting in a mode conditional constant of, n, 2.045. Model predicts insertion success between 90-100% for a 6.8 μm diameter electrode and was used to approximate applied force as 750 μN which is close to reference data of 780 μN [1]. Second, we developed a PVC phantom that mimics the brain's elastic modulus. This phantom was matched to insertion success data obtained from carbon fiber arrays [1]. Overall, these results enable studies to be conducted on other proposed cellular scale electrodes prior to animal testing or large scale fabrication.
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Combination of a peptide-modified gellan gum hydrogel with cell therapy in a lumbar spinal cord injury animal model. Biomaterials 2016; 105:38-51. [PMID: 27505621 DOI: 10.1016/j.biomaterials.2016.07.019] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 07/09/2016] [Accepted: 07/16/2016] [Indexed: 12/30/2022]
Abstract
Spinal Cord Injury (SCI) is a highly incapacitating condition for which there is still no cure. Current clinical approaches are mainly based on palliative care, so there is a need to find possible treatments to SCI. Cellular transplantation is regarded with great expectation due to the therapeutic potential of cells such as Adipose tissue-derived Stromal/Stem Cells (ASCs) or Olfactory Ensheathing Cells (OECs). Both are accessible sources and present positive paracrine and cell-to-cell interactions, previously reported by our group. Additionally, biomaterials such as hydrogels have been applied in SCI repair with promising results. We propose to combine a GRGDS-modified gellan gum hydrogel with ASCs and OECs in order to promote SCI regeneration. In vitro, ASCs and OECs could be co-cultured within GG-GRGDS hydrogels inducing a more robust neurite outgrowth when compared to controls. In vivo experiments in a hemisection SCI rat model revealed that the administration of ASCs and OECs encapsulated in a GG-GRGDS hydrogel led to significant motor improvements when compared to both control (SCI) and hydrogel alone (GG-GRGDS) groups. This was accompanied by a decreased infiltration of inflammatory cells and astrocytes, and by an increased intensity of neurofilament. These results suggest evident gains induced by the encapsulation of ASCs and OECs in GG-GRGDS based hydrogels.
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25
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Tam AL, Lim HJ, Wistuba II, Tamrazi A, Kuo MD, Ziv E, Wong S, Shih AJ, Webster RJ, Fischer GS, Nagrath S, Davis SE, White SB, Ahrar K. Image-Guided Biopsy in the Era of Personalized Cancer Care: Proceedings from the Society of Interventional Radiology Research Consensus Panel. J Vasc Interv Radiol 2015; 27:8-19. [PMID: 26626860 DOI: 10.1016/j.jvir.2015.10.019] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 10/23/2015] [Accepted: 10/23/2015] [Indexed: 02/07/2023] Open
Affiliation(s)
- Alda L Tam
- Departments of Interventional Radiology, Houston, Texas.
| | - Howard J Lim
- Division of Medical Oncology, University of British Columbia, British Columbia Cancer Agency, Vancouver, British Columbia, Canada
| | | | - Anobel Tamrazi
- Division of Vascular and Interventional Radiology, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Michael D Kuo
- Department of Radiological Sciences, David Geffen School of Medicine at UCLA, Los Angeles, California
| | - Etay Ziv
- Departments of Interventional Radiology and Computational Biology, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Stephen Wong
- Department of Systems Medicine & Bioengineering, Houston Methodist Research Institute, Houston, Texas
| | - Albert J Shih
- Departments of Mechanical and Biomechanical Engineering, University of Michigan, Ann Arbor, Michigan
| | - Robert J Webster
- Department of Mechanical Engineering, Vanderbilt University, Nashville, Tennessee
| | - Gregory S Fischer
- Automation and Interventional Medicine Robotics Lab, Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts
| | - Sunitha Nagrath
- Chemical and Biomedical Engineering, University of Michigan, Ann Arbor, Michigan
| | - Suzanne E Davis
- Division of Cancer Medicine, Research Planning and Development, University of Texas M.D. Anderson Cancer Center, Houston, Texas
| | - Sarah B White
- Department of Systems Medicine & Bioengineering, Houston Methodist Research Institute, Houston, Texas; Departments of Radiology, Neuroscience, Pathology & Laboratory Medicine, Weill Cornell Medical College of Cornell University, New York, New York; Division of Vascular and Interventional Radiology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Kamran Ahrar
- Departments of Interventional Radiology, Houston, Texas
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Tai BL, Rooney D, Stephenson F, Liao PS, Sagher O, Shih AJ, Savastano LE. Development of a 3D-printed external ventricular drain placement simulator: technical note. J Neurosurg 2015; 123:1070-6. [DOI: 10.3171/2014.12.jns141867] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In this paper, the authors present a physical model developed to simulate accurate external ventricular drain (EVD) placement with realistic haptic and visual feedbacks to serve as a platform for complete procedural training. Insertion of an EVD via ventriculostomy is a common neurosurgical procedure used to monitor intracranial pressures and/or drain CSF. Currently, realistic training tools are scarce and mainly limited to virtual reality simulation systems. The use of 3D printing technology enables the development of realistic anatomical structures and customized design for physical simulators. In this study, the authors used the advantages of 3D printing to directly build the model geometry from stealth head CT scans and build a phantom brain mold based on 3D scans of a plastinated human brain. The resultant simulator provides realistic haptic feedback during a procedure, with visualization of catheter trajectory and fluid drainage. A multiinstitutional survey was also used to prove content validity of the simulator. With minor refinement, this simulator is expected to be a cost-effective tool for training neurosurgical residents in EVD placement.
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Affiliation(s)
- Bruce L. Tai
- Departments of 1Mechanical Engineering,
- 2Neurosurgery, and
| | - Deborah Rooney
- 3Learning Health Sciences, University of Michigan, Ann Arbor, Michigan; and
| | | | - Peng-Siang Liao
- 4Advanced Institute of Manufacturing with High-Tech Innovations, National Chung Cheng University, Taiwan
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27
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Wang Y, Tai BL, Yu H, Shih AJ. Silicone-Based Tissue-Mimicking Phantom for Needle Insertion Simulation. J Med Device 2014. [DOI: 10.1115/1.4026508] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Silicone-based tissue-mimicking phantom is widely used as a surrogate of tissue for clinical simulators, allowing clinicians to practice medical procedures and researchers to study the performance of medical devices. This study investigates using the mineral oil in room-temperature vulcanizing silicone to create the desired mechanical properties and needle insertion characteristics of a tissue-mimicking phantom. Silicone samples mixed with 0, 20, 30, and 40 wt. % mineral oil were fabricated for indentation and needle insertion tests and compared to four types of porcine tissues (liver, muscle with the fiber perpendicular or parallel to the needle, and fat). The results demonstrated that the elastic modulus and needle insertion force of the phantom both decrease with an increasing concentration of mineral oil. Use of the mineral oil in silicone could effectively tailor the elastic modulus and needle insertion force to mimic the soft tissue. The silicone mixed with 40 wt. % mineral oil was found to be the best tissue-mimicking phantom and can be utilized for needle-based medical procedures.
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Affiliation(s)
- Yancheng Wang
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109 e-mail:
| | - Bruce L. Tai
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109 e-mail:
| | - Hongwei Yu
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109 e-mail:
| | - Albert J. Shih
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109 e-mail:
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