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Zhang Q, Li Y, Liu J, Huang J, Tan Q, Wang C, Xiao Y, Zheng H, Ma T. A PMN-PT Composite-Based Circular Array for Endoscopic Ultrasonic Imaging. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2020; 67:2354-2362. [PMID: 32746191 DOI: 10.1109/tuffc.2020.3005029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Endoscopic ultrasound (EUS), an interventional imaging technology, utilizes a circular array to delineate the cross-sectional morphology of internal organs through the gastrointestinal (GI) track. However, the performance of conventional EUS transducers has scope for improvement because of the ordinary piezoelectric parameters of Pb(Zr, Ti) [Formula: see text] (PZT) bulk ceramic as well as its inferior mechanical flexibility which can cause material cracks during the circular shaping process. To achieve both prominent imaging capabilities and high device reliability, a 128-element 6.8-MHz circular array transducer is developed using a Pb(Mg [Formula: see text]Nb [Formula: see text]) [Formula: see text]-PbTiO3 (PMN-PT) 1-3 composite with a coefficient of high electromechanical coupling ( [Formula: see text]) and good mechanical flexibility. The characterization results exhibit a large average bandwidth of 58%, a high average sensitivity of 100 mVpp, and a crosstalk of less than -37 dB near the center frequency. Imaging performance of the PMN-PT composite-based array transducer is evaluated by a wire phantom, an anechoic cyst phantom, and an ex-vivo swine intestine. This work demonstrates the superior performance of the crucial ultrasonic device based on an advanced PMN-PT composite material and may lead to the development of next-generation biomedical ultrasonic devices for clinical diagnosis and treatment.
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Gagnani SP, Kholakiya YR, Arora A, Bhutia O, Seith A, Khandelwal RK, Roychoudhury A. Ultrasound-guided autologous blood injection in patients with chronic recurrent temporomandibular joint dislocation. Natl J Maxillofac Surg 2020; 11:34-39. [PMID: 33041574 PMCID: PMC7518496 DOI: 10.4103/njms.njms_57_18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 02/18/2019] [Accepted: 04/17/2019] [Indexed: 11/16/2022] Open
Abstract
Objective: To evaluate the accuracy and effectiveness of ultrasound (US) guided autologous blood injection (ABI) for the treatment of chronic recurrent TMJ dislocation. Design: Prospective cohort study. Setting: Centre for medical education and research. Participants (or Animals, Specimens, Cadavers): Ninteen patients with chronic recurrent TMJ dislocation (Fifteen bilateral and fourteen unilateral). Interventions: Autologous blood injected, 2ml in superior joint space (SJS) and 1 ml in peri-capsular tissue (PT) under ultra sound guidance. Main Outcome Measure(s): Reduction in number of dislocation episodes, maximal mouth opening, pain (visual analogue scale) and TMJ sounds (present or absent) at the end of 2 weeks, 3 months, 6 months and 1 year. Results: At 2 weeks post operatively 18 patients (95%) were asymptomatic only one patient (5%) complained of Recurrence of dislocation and was treated successfully by a 2nd injection. At subsequent follow up visits none reported dislocation. Conclusion(s): US guided ABI for patients with chronic recurrent TMJ dislocations serves as an alternative, minimally invasive, highly effective and accurate modality of treatment since it includes exposure without radiation, real-time visualization of soft tissues, visualization of the needle tip advancement, local anesthetic spread relevant to the surrounding structures which can be performed on an outpatient basis.
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Affiliation(s)
- Sahil Parvez Gagnani
- Department of Oral and Maxillofacial Surgery, All India Institute of Medical Sciences, New Delhi, India
| | | | - Ankit Arora
- Department of Oral and Maxillofacial Surgery, All India Institute of Medical Sciences, New Delhi, India
| | - Ongkila Bhutia
- Department of Oral and Maxillofacial Surgery, All India Institute of Medical Sciences, New Delhi, India
| | - Ashu Seith
- Department of Radiology, All India Institute of Medical Sciences, New Delhi, India
| | | | - Ajoy Roychoudhury
- Department of Oral and Maxillofacial Surgery, All India Institute of Medical Sciences, New Delhi, India
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Cassani L, Aihara H, Anand GS, Chahal P, Dacha S, Duloy A, Ghassemi S, Huang C, Kowalski TE, Kushnir V, Qayed E, Sheth SG, Simons-Linares CR, Taylor JR, Umar SB, Vela SAF, Walsh CM, Williams RL, Wagh MS. Core curriculum for EUS. Gastrointest Endosc 2020; 92:469-473. [PMID: 32713612 DOI: 10.1016/j.gie.2020.04.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Accepted: 04/11/2020] [Indexed: 02/08/2023]
Affiliation(s)
- Lisa Cassani
- Department of Medicine, Division of Digestive Diseases, Emory University School of Medicine, and Atlanta VA Medical Center, Atlanta, GA, USA
| | - Hiroyuki Aihara
- Division of Gastroenterology, Hepatology and Endoscopy, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Gobind S Anand
- Division of Gastroenterology, University of California San Diego, San Diego, CA, USA
| | - Prabhleen Chahal
- Digestive Disease and Surgery Institute, Cleveland Clinic, OH, USA; Digestive Disease and Surgery Institute, Cleveland Clinic, OH
| | - Sunil Dacha
- Division of Gastroenterology, Department of Internal Medicine, Houston Methodist Hospital and Texas A&M University, Houston, Texas, USA
| | - Anna Duloy
- Division of Gastroenterology, University of Colorado-Denver, Aurora, CO, USA; Division of Gastroenterology, University of Colorado-Denver, Aurora, CO, USA
| | - Sahar Ghassemi
- Division of Gastroenterology and Hepatology, Duke University, Durham, NC
| | - Christopher Huang
- Section of Gastroenterology, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, USA
| | - Thomas E Kowalski
- Division of Gastroenterology and Hepatology, Thomas Jefferson University Hospital, Philadelphia, PA, USA
| | - Vladimir Kushnir
- Division of Gastroenterology, John T. Milliken Department of Medicine, Washington University School of Medicine in St. Louis, St. Louis, MO, USA
| | - Emad Qayed
- Department of Medicine, Division of Digestive Diseases, Emory University School of Medicine, Atlanta, GA, USA
| | - Sunil G Sheth
- Division of Gastroenterology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
| | | | - Jason R Taylor
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, Saint Louis University, St Louis, Missouri, USA
| | - Sarah B Umar
- Division of Gastroenterology Mayo Clinic Arizona, Scottsdale, AZ, USA
| | - Stacie A F Vela
- Gastroenterology Section, Phoenix VA Health Care System, University of Arizona-Phoenix
| | - Catharine M Walsh
- Division of Gastroenterology, Hepatology and Nutrition and the Research and Learning Institutes, Hospital for Sick Children, Department of Paediatrics and the Wilson Centre, University of Toronto, Toronto, Canada
| | - Renee L Williams
- Department of Medicine, Division of Gastroenterology, NYU Grossman School of Medicine, New York, USA
| | - Mihir S Wagh
- Division of Gastroenterology, University of Colorado-Denver, Aurora, CO, USA
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Abstract
High resolution, microultrasound (μUS) scanning of the gastrointestinal (GI) tract has potential as an important transmural imaging modality to aid in diagnosis. Operating at higher frequencies than conventional clinical ultrasound instruments, μUS is capable of providing scanned images of the GI tract with higher resolution. To investigate the use of μUS for this application, a phantom which is cost effective, within ethical guidelines and, most importantly, similar in histology to the human GI tract is necessary. Therefore, a phantom utilizing porcine small bowel tissue has been developed for custom assembled μUS scanning systems. Two such systems, a stepping scanner and a continuous sweep scanner were utilized to repeatedly scan regions of prepared samples of porcine small bowel tissue. The porcine small bowel tissue phantom was perfused with degassed phosphate buffer saline (dPBS) solution through a cannula inserted in its mesenteric vessel to simulate in vivo conditions and achieve better μUS mucosal characterization. The μUS system scans a transducer across the tissue phantom to acquire RF echo data, which is then processed using MATLAB. A B-scan reconstruction produces 2D images with relative echo strength mapped to a color map of the user's choice. The phantom developed also allows for modifications such as the insertion of fiducial markers to detect tissue change over time and simultaneous perfusion and scanning, providing a platform for more detailed research and investigation into μUS scanning of the GI tract.
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Varas Lorenzo MJ, Abad Belando R, Sánchez-Vizcaíno Mengual E. Miniprobe Endoscopic Sonography for Gastrointestinal Tract Assessment: A Case Series of 1451 Procedures. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2018; 37:293-303. [PMID: 28748539 DOI: 10.1002/jum.14330] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 04/10/2017] [Accepted: 04/18/2017] [Indexed: 06/07/2023]
Abstract
Conventional endoscopic sonography has allowed precise diagnostics without disturbances, and miniprobes can be easily introduced through the biopsy channel of the endoscope. Miniprobe endoscopic sonography has many benefits compared with conventional endoscopic sonography. Although there are well-known indications for miniprobe endoscopic sonography in endoscopic digestive tract assessment, there is still a need for this method to be widely spread among physicians and commonly used by most endoscopists. The aim of this series was to describe a multicenter retrospective experience with 1451 procedures using miniprobes, presenting examples and the applicability and usefulness of this technology in the daily activities of an endoscopy department.
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Affiliation(s)
- Modesto J Varas Lorenzo
- Endoscopy Unit, Sanitas CIMA Hospital, Barcelona, Spain
- Department of Gastroenterology, Sanitas CIMA Hospital, Barcelona, Spain
- Teknon Medical Center, Barcelona, Spain
- Faculty of Health Sciences, Universitat Oberta de Cataluny (UOC), Barcelona, Spain
| | - Ramón Abad Belando
- Endoscopy Unit, Sanitas CIMA Hospital, Barcelona, Spain
- Department of Gastroenterology, Sanitas CIMA Hospital, Barcelona, Spain
- Planas Clinic, Barcelona, Spain
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Santander C, Perea E, Caldas M, Clave P. Catheter-based high-frequency intraluminal ultrasound imaging is a powerful tool to study esophageal dysmotility patients. Ann N Y Acad Sci 2017; 1395:60-66. [PMID: 28141904 DOI: 10.1111/nyas.13313] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 12/19/2016] [Accepted: 12/22/2016] [Indexed: 02/06/2023]
Abstract
High-resolution manometry (HRM) is currently the most important diagnostic test for esophageal motility disorders, providing information on the contraction pattern of the circular muscle layer, which helps classify these esophageal motor diseases. However, with the increasing development of ultrasound, other techniques, such as high-frequency intraluminal ultrasound (HFIUS), have gained importance. This technique uses a flexible shaft with a central wire integrated into a standard endoscope, which facilitates real-time sonography. Its main utility is to provide anatomical information on the structure of the esophageal wall, including both the circular and longitudinal layers that constitute the esophageal muscularis propria. Increasing knowledge about these motility disorders has led to the hypothesis that, in addition to an abnormal contraction pattern of the circular muscle, an overall increased muscle thickness and an abnormal longitudinal muscle contraction could be added as pathophysiological factors. The increase in muscle thickness could be an important indicator of the severity of diseases, such as achalasia, distal esophageal spasm, or hypercontractile esophagus. More studies are required before definitive conclusions can be reached, but HFIUS employed simultaneously with HRM could provide a more complete and precise evaluation of these esophageal motor disorders.
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Affiliation(s)
- Cecilio Santander
- Division of Gastroenterology and Hepatology, Digestive Motility Unit, IIS-IP and CIBEREHD, Universidad Autónoma de Madrid, Hospital Universitario de La Princesa (HULP), Madrid, Spain
| | - Elena Perea
- Division of Gastroenterology and Hepatology, Digestive Motility Unit, IIS-IP and CIBEREHD, Universidad Autónoma de Madrid, Hospital Universitario de La Princesa (HULP), Madrid, Spain
| | - María Caldas
- Division of Gastroenterology and Hepatology, Digestive Motility Unit, IIS-IP and CIBEREHD, Universidad Autónoma de Madrid, Hospital Universitario de La Princesa (HULP), Madrid, Spain
| | - Pere Clave
- Universitat Autònoma de Barcelona, Hospital de Mataró, Barcelona, Spain
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High performance relaxor-based ferroelectric single crystals for ultrasonic transducer applications. SENSORS 2014; 14:13730-58. [PMID: 25076222 PMCID: PMC4178991 DOI: 10.3390/s140813730] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Revised: 07/18/2014] [Accepted: 07/18/2014] [Indexed: 01/21/2023]
Abstract
Relaxor-based ferroelectric single crystals Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) have drawn much attention in the ferroelectric field because of their excellent piezoelectric properties and high electromechanical coupling coefficients (d33∼2000 pC/N, kt∼60%) near the morphotropic phase boundary (MPB). Ternary Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT) single crystals also possess outstanding performance comparable with PMN-PT single crystals, but have higher phase transition temperatures (rhombohedral to tetragonal Trt, and tetragonal to cubic Tc) and larger coercive field Ec. Therefore, these relaxor-based single crystals have been extensively employed for ultrasonic transducer applications. In this paper, an overview of our work and perspectives on using PMN-PT and PIN-PMN-PT single crystals for ultrasonic transducer applications is presented. Various types of single-element ultrasonic transducers, including endoscopic transducers, intravascular transducers, high-frequency and high-temperature transducers fabricated using the PMN-PT and PIN-PMN-PT crystals and their 2-2 and 1-3 composites are reported. Besides, the fabrication and characterization of the array transducers, such as phased array, cylindrical shaped linear array, high-temperature linear array, radial endoscopic array, and annular array, are also addressed.
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Cardoso R, Coburn N, Seevaratnam R, Sutradhar R, Lourenco LG, Mahar A, Law C, Yong E, Tinmouth J. A systematic review and meta-analysis of the utility of EUS for preoperative staging for gastric cancer. Gastric Cancer 2012; 15 Suppl 1:S19-26. [PMID: 22237654 DOI: 10.1007/s10120-011-0115-4] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Accepted: 10/31/2011] [Indexed: 02/07/2023]
Abstract
BACKGROUND Accurate preoperative staging is important in determining the appropriate treatment of gastric cancer. Recently, endoscopic ultrasound (EUS) has been introduced as a staging modality. However, reported test characteristics for EUS in gastric cancer vary. Our purpose in this study was to identify, synthesize, and evaluate findings from all articles on the performance of EUS in the preoperative staging of gastric cancer. METHODS Electronic literature searches were conducted using Medline, Embase, and the Cochrane Central Register of Controlled Trials from 1 January 1998 to 1 December 2009. All search titles and abstracts were independently rated for relevance by a minimum of two reviewers. Meta-analysis for the performance of EUS was analyzed by calculating agreement (Kappa statistic), and pooled estimates of accuracy, sensitivity, and specificity for all EUS examinations, using histopathology as the reference standard. Subgroup analyses were also performed. RESULTS Twenty-two articles met our inclusion criteria and were included in the review. EUS pooled accuracy for T staging was 75% with a moderate Kappa (0.52). EUS was most accurate for T3 disease, followed by T4, T1, and T2. EUS pooled accuracy for N staging was 64%, sensitivity was 74%, and specificity was 80%. There was significant heterogeneity between the included studies. Subgroup analyses found that annual EUS volume was not associated with EUS T and N staging accuracy (P = 0.836, 0.99, respectively). CONCLUSION EUS is a moderately accurate technique that seems to describe advanced T stage (T3 and T4) better than N or less advanced T stage. Stratifying by EUS annual volume did not affect EUS performance in staging gastric cancer.
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Affiliation(s)
- Roberta Cardoso
- Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Canada
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Is ultrasonography of the temporomandibular joint ready for prime time? Is there a "window" of opportunity? J Oral Maxillofac Surg 2012; 70:1310-4. [PMID: 22608815 DOI: 10.1016/j.joms.2012.02.034] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Revised: 02/27/2012] [Accepted: 02/28/2012] [Indexed: 11/24/2022]
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Colonic Perforation Following Polypectomy of a Gastrointestinal Follicular Lymphoma Masquerading as a Colon Polyp. J Gastrointest Cancer 2010; 43:382-4. [PMID: 20922579 DOI: 10.1007/s12029-010-9217-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Gastrointestinal Endoscopy. Crit Care Med 2008. [DOI: 10.1016/b978-032304841-5.50020-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Tierney WM, Adler DG, Chand B, Conway JD, Croffie JMB, DiSario JA, Mishkin DS, Shah RJ, Somogyi L, Wong Kee Song LM, Petersen BT. Echoendoscopes. Gastrointest Endosc 2007; 66:435-42. [PMID: 17640635 DOI: 10.1016/j.gie.2007.05.028] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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