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WITHDRAWN: Neoadjuvant therapy leads to objective response in intrahepatic cholangiocarcinoma. HPB (Oxford) 2024:S1365-182X(24)01277-2. [PMID: 38789383 DOI: 10.1016/j.hpb.2024.04.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Accepted: 04/19/2024] [Indexed: 05/26/2024]
Abstract
The Publisher regrets that this article is an accidental duplication of an article that has already been published, https://doi.org/10.1016/j.hpb.2024.04.011. The duplicate article has therefore been withdrawn. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/policies/article-withdrawal.
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Neoadjuvant therapy leads to objective response in intrahepatic cholangiocarcinoma. HPB (Oxford) 2024:S1365-182X(24)01259-0. [PMID: 38705793 DOI: 10.1016/j.hpb.2024.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 04/08/2024] [Accepted: 04/18/2024] [Indexed: 05/07/2024]
Abstract
BACKGROUND Intrahepatic cholangiocarcinoma (iCCA) is the second most common hepatic malignancy and has a poor prognosis. Surgical resection is the standard of care for patients with resectable disease, representing 30-40% of cases. Increasingly, neoadjuvant systemic therapy is being utilized in patients due to high-risk anatomic or biologic considerations. However, data on the clinical effect of this approach are limited. We performed a cohort study to evaluate the effect of neoadjuvant therapy in patients with oncologically high-risk iCCA. METHODS iCCA patients (n = 181) between the years 2014-2020 were reviewed for clinical, histopathologic, treatment, and outcome-related data. Tumor regression grade was scored per CAP criteria for gastrointestinal carcinomas. RESULTS 47 iCCA patients received neoadjuvant therapy and 72 did not. Neoadjuvant treatment led to objective response and tumor regression by CAP score. After adjustment for age, clinical stage, and tumor size, the outcomes of patients who had neoadjuvant therapy followed by surgery were not significantly different from those patients who had surgery first. DISCUSSION In conclusion, neoadjuvant therapy in iCCA facilitated surgical care. The progression-free and overall survival for surgical patients with and without neoadjuvant therapy were not significantly different suggesting this approach needs further exploration as an effective treatment paradigm.
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Systematic Review of Procedural Skill Simulation in Health Care in Low- and Middle-Income Countries. Simul Healthc 2023:01266021-990000000-00076. [PMID: 37440427 DOI: 10.1097/sih.0000000000000737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/15/2023]
Abstract
ABSTRACT Low- and middle-income countries (LMICs) have adopted procedural skill simulation, with researchers increasingly investigating simulation efforts in resource-strained settings. We aim to summarize the current state of procedural skill simulation research in LMICs focusing on methodology, clinical area, types of outcomes and cost, cost-effectiveness, and overall sustainability. We performed a comprehensive literature review of original articles that assessed procedural skill simulation from database inception until April 2022.From 5371 screened articles, 262 were included in this review. All included studies were in English. Most studies were observational cohort studies (72.9%) and focused on obstetrics and neonatal medicine (32.4%). Most measured outcome was the process of task performance (56.5%). Several studies mentioned cost (38.9%) or sustainability (29.8%). However, few articles included actual monetary cost information (11.1%); only 1 article assessed cost-effectiveness. Based on our review, future research of procedural skill simulation in LMICS should focus on more rigorous research, cost assessments, and on less studied areas.
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Abstract 814: Novel strategy for aptamer-directed nanovesicle targeting in cholangiocarcinoma. Cancer Res 2023. [DOI: 10.1158/1538-7445.am2023-814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
Abstract
Abstract
Background: Cholangiocarcinoma (CCA) is a heterogeneous malignancy arising from the biliary epithelium. Its diverse molecular landscape and aggressive biology render many anti-cancer therapies ineffective. Nanovesicle technology provides an opportunity for therapeutic inhibition of oncogenic targets that have been previously classified as undruggable. EpCAM is an epithelial-specific, transmembrane glycoprotein with increased expression in human and murine CCA which can be used for nanovesicle targeting. As a proof of concept study, we designed and validated a novel strategy to direct therapeutic milk-derived nanovesicles (tMNVs) to CCA tumors.
Methods: tMNVs were decorated with RNA nanoparticles containing a validated aptamer (EpDT3) against EpCAM conjugated to a cholesterol-triethylene-glycol (TEG) scaffold containing an Alexa647 fluorophore. Human and murine CCA cell lines were treated with aptamer directed tMNVs and assessed for nanovesicle uptake by fluorescent microscopy. CCA tumor tissue, derived from orthotopic implantation of a syngeneic CCA cell line, SB1, into a C57BL/6 mouse, was collected and treated with either aptamer-directed or bare tMNVs ex vivo, and compared with adjacent normal liver tissue. Flow cytometry was utilized to characterize tMNVs absorption profile. C57BL/6 mice who had previously undergone SB1 orthotopic and flank implantation were treated with aptamer-directed tMNVs by tail-vein injection and subsequently euthanized. Tissue was collected for biodistribution analyses by fluorescent microscopy. The experiment was repeated in NOD-scid mice following orthotopic implantation of patient derived xenograft (PDX) CCA tumor.
Results: Both human and murine CCA cells treated with aptamer-directed tMNVs demonstrated high fluorescent signal consistent with tMNV absorption within 12 hours of application. Flow cytometry analysis showed aptamer-directed tMNVs were absorbed at a higher proportion by CCA tumors than bare tMNVs ex vivo. Aptamer-directed tMNVs also had better absorption by CCA tumors compared to adjacent normal liver tissue. Following treatment with aptamer-directed or bare tMNVs in vivo, fluorescent microscopy demonstrated that aptamer-directed tMNVs were significantly better absorbed in the orthotopic SB1 tumors, followed by the subcutaneous tumors. Minimal fluorescent signal was noted in the normal adjacent liver. Orthotopically implanted PDX tumors also demonstrated high fluorescent signals following intravenous treatment with aptamer-directed tMNVs.
Conclusions: Utilizing a novel targeting strategy, we were able to design tMNVs capable of reliably and specifically targeting CCA in preclinical models. This work is foundational to the future application of nanovesicle technology in the CCA treatment paradigm.
Citation Format: Mincheng Yu, Jennifer L. Tomlinson, Emilien J. Loeuillard, Ryan D. Watkins, Caitlin B. Conboy, Shohei Takaichi, Nathan W. Werneburg, Roberto Alva-Ruiz, Amro Abdelrahman, Danielle M. Carlson, Jingchun Yang, Sumera I. Ilyas, Gregory J. Gores, Tushar Patel, Rory L. Smoot. Novel strategy for aptamer-directed nanovesicle targeting in cholangiocarcinoma [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 814.
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Discovery of novel interactions with LCK in cholangiocarcinoma using proximity-dependent biotinylation. J Clin Oncol 2023. [DOI: 10.1200/jco.2023.41.4_suppl.575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
575 Background: Cholangiocarcinoma (CCA) is a lethal hepatobiliary adenocarcinoma with increasing incidence and poor outcomes. Treatment success has been hindered by resistance, and new therapeutic strategies are necessary. The Src-family tyrosine kinase, LCK, activates Yes-associated protein (YAP), a known oncogene in CCA. While YAP has been historically difficult to target, we recently described LCK inhibition as a potential therapeutic option in CCA. We probed the LCK interactome employing biotinylation site identification technology (BioSITe) to discover molecular co-dependencies in the LCK-YAP axis. Methods: LCK-deficient HuCCT1, wild-type HuCCT1, and wild-type RBE cells were transfected with pEF-LCK-TurboID and used to reveal protein-protein interactions. Biotinylated peptides were enriched using anti-biotin antibodies followed by mass spectrometry analysis. Co-immunoprecipitation (Co-IP) was used to confirm interactions between LCK and identified interactors. Phosphoproteome profiling of human CCA tumors and patient derived xenografts was conducted to identify active kinase signatures in CCA. Tyrosine phosphorylated peptides were enriched using anti-phosphotyrosine antibody beads and analyzed by high-resolution mass spectrometery/liquid chromatography. Immunoblot analysis of HuCCT1 and LCK-deficient HuCCT1 cells was used to map the mechanistic interaction between LCK and epidermal growth factor receptor, EGFR. Inhibitors of EGFR and LCK, afatinib and NTRC 0652-0, respectively, were tested in vitro on human and murine CCA cell lines. Cell viability was determined with CellTiter-Glo; Calcusyn software was used to determine synergistic drug effects. Results: We discovered intracellular interactors of LCK in CCA using BioSITe. We identified both known and novel LCK interactors, including EGFR. Given that EGFR functions as a molecular driver of tumorigenesis and is increasingly recognized as a biomarker of resistance in a variety of tumors, we performed a phosphoproteomic evaluation of CCA tumors in which activated EGFR was identified by the presence of EGFR-Y1092, Y1197, and Y1172 phosphorylation. EGFR phosphorylation decreased under conditions of genetic LCK knock out and inhibition by NTRC 0652-0. Co-IP confirmed the interaction of EGFR with LCK. EGFR-Y1092 phosphorylation was downregulated with genetic knockout of LCK by immunoblot. Finally, EGFR inhibition was evaluated as a therapeutic strategy utilizing afatinib. Effects on cell viability were noted in both human and murine CCA cells. Afatinib and NTRC 0652-0 demonstrated a synergistic effect in vitro, with calculated combination indices of 0.007 – 0.790. Conclusions: A novel interaction between EGFR and LCK in CCA was identified using an unbiased proximity-dependent biotinylation technique. Dual blockade of LCK and EGFR is synergistic in CCA and may be a viable therapeutic approach for patients.
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SHP2 inhibition enhances Yes-associated protein mediated liver regeneration in murine partial hepatectomy models. JCI Insight 2022; 7:159930. [PMID: 35763355 PMCID: PMC9462473 DOI: 10.1172/jci.insight.159930] [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: 03/15/2022] [Accepted: 06/24/2022] [Indexed: 11/17/2022] Open
Abstract
Disrupted liver regeneration following hepatectomy represents an “undruggable” clinical challenge associated with poor patient outcomes. Yes-associated protein (YAP), a transcriptional coactivator that is repressed by the Hippo pathway, is instrumental in liver regeneration. We have previously described an alternative, Hippo-independent mechanism of YAP activation mediated by downregulation of protein tyrosine phosphatase nonreceptor type 11 (PTPN11, also known as SHP2) inhibition. Herein, we examined the effects of YAP activation with a selective SHP1/SHP2 inhibitor, NSC-87877, on liver regeneration in murine partial hepatectomy models. In our studies, NSC-87877 led to accelerated hepatocyte proliferation, improved liver regeneration, and decreased markers of injury following partial hepatectomy. The effects of NSC-87877 were lost in mice with hepatocyte-specific Yap/Taz deletion, and this demonstrated dependence on these molecules for the enhanced regenerative response. Furthermore, administration of NSC-87877 to murine models of nonalcoholic steatohepatitis was associated with improved survival and decreased markers of injury after hepatectomy. Evaluation of transcriptomic changes in the context of NSC-87877 administration revealed reduction in fibrotic signaling and augmentation of cell cycle signaling. Cytoprotective changes included downregulation of Nr4a1, an apoptosis inducer. Collectively, the data suggest that SHP2 inhibition induces a pro-proliferative and cytoprotective enhancement of liver regeneration dependent on YAP.
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Post-injury outcomes of children with behavioral health disorders. J Pediatr Surg 2022; 57:462-468. [PMID: 34052006 DOI: 10.1016/j.jpedsurg.2021.04.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/28/2021] [Accepted: 04/10/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND The impact of Behavioral Health Disorders (BHDs) on pediatric injury is poorly understood. We investigated the relationship between BHDs and outcomes following pediatric trauma. METHODS We analyzed injured children (age 5-15) from 2014 to 2016 using the Pediatric Trauma Quality Improvement Program. The primary outcome was in-hospital mortality. Univariable and multivariable analyses compared children with and without a comorbid BHD. RESULTS Of 69,305 injured children, 3,448 (5%) had a BHD. These 3,448 children had a median of 1 [IQR: 1, 1] BHD diagnosis: ADHD (n = 2491), major psychiatric disorder (n = 1037), drug use disorder (n = 250), and alcohol use disorder (n = 29). A higher proportion of injured children with BHDs suffered intentional and penetrating injury. Firearm injuries were more common for BHD patients (3% vs 1%, p<0.001). Children with BHDs were more likely to have an ISS>25 compared to children without (5% vs 3%, p<0.001). While median LOS was longer for BHD patients (2 [1, 3] vs 2 [1, 4], p<0.001), mortality was similar (1% vs 1%, p = 0.76) and complications were less frequent (7% vs 8%, p = 0.002). BHD was associated with lower risk of mortality (OR 0.45, 95%CI [0.30, 0.69]) after controlling for age, sex, race, trauma type, and injury intent and severity. CONCLUSION Children with BHDs experienced lower in-hospital mortality risk after traumatic injury despite more severe injury upon presentation. Intentional and penetrating injuries are particularly concerning, and future work should assess prevention efforts in this vulnerable group.
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ACP Journal Club. Review: DOACs do not differ from standard anticoagulants for recurrent VTE; factor Xa inhibitors reduce bleeding. Ann Intern Med 2015; 163:JC3. [PMID: 26502140 DOI: 10.7326/acpjc-2015-163-8-003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Abstract
Noninvasive magnetic resonance temperature maps that are used to monitor thermal ablation of tissue are described. In magnetic resonance images, thermally induced proton nuclear magnetic resonance frequency shifts, and changes in the longitudinal relaxation time produce both phase and magnitude changes in the MR signal. Temperature maps with improved sensitivity are derived from the complex-difference nuclear magnetic resonance signal. Bovine muscle specimens were heated with focused ultrasound to model thermal surgery and create a known thermal distribution to test the method. Resulting MR images acquired in 2 s produce temperature maps with 1 min resolution and 2 degrees C temperature sensitivity. The temperature sensitivity was increased by extending the acquisition to 5 s, by decreasing the receiver bandwidth, and increasing the echo time.
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Abstract
A noninvasive method of tissue ablation that is guided and monitored with magnetic resonance (MR) imaging has been developed. The method uses sharply focused ultrasound transducers of different focal lengths to induce a localized temperature elevation during a short exposure (1-20 seconds). A hydraulic, computer-controlled positioning device moves the transducer in an MR imager. The positioner is built into a standard cradle in the imager. The system includes cavitation detection and power monitoring circuitry for patient safety. The target volume is outlined with cross-sectional MR images obtained immediately before sonication. By means of the software, the focus is moved to ablate the volume defined with the images. The temperature elevation during the exposure is monitored by means of the proton resonance frequency shift with fast gradient-echo sequences, and the necrosed volume is demonstrated with T2-weighted fast spin-echo images. This method has been extensively tested in in vivo animal experiments and is now undergoing clinical trial.
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Abstract
PURPOSE To measure the performance characteristics of a focused ultrasound (US) system for magnetic resonance (MR) imaging-guided tumor ablation. MATERIALS AND METHODS The authors constructed a focused US system for MR imaging-guided tumor ablation. The location of the heated region and thermal dose were monitored with temperature-sensitive MR images obtained in phantoms and rabbit skeletal muscle after application of each sonic pulse. RESULTS The region heated by the focused ultrasound beam was within 1 mm of that observed on temperature-sensitive fast gradient-echo MR images of in vivo rabbit skeletal muscle. Analysis of heat flow and the rate of coagulation necrosis provided an estimate of the size of the ablated region that was in agreement with experimental findings. CONCLUSION MR imaging provides target definition and control for thermal therapy in regions of variable perfusion or in tissues that are not well characterized.
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Abstract
Deep lying soft tissue tumors may be treated by a nonincisional surgical procedure executed inside an MR imaging system using a thermal effect delivered by a focused ultrasound transducer. A prototype system is constructed to assess MRI thermal monitoring and the localization of the heat zone in muscle. The temperature distribution of the focal spot is imaged with MRI while mechanically moving the transducer with an hydraulic 3-axis positioner. Acoustic power is applied with a spherical shell transducer using 1- to 10-s duration pulses at frequencies of 1.5 MHz to selectively coagulate tissue at 60-70 degrees C. The procedure is monitored with a series of fast second gradient echo, T1-weighted, temperature sensitive MR sequences. Acquisitions are optimized for high temperature sensitive images that yield the thermal diffusivity, heat flow time constant and the focal spot size in muscle. MR temperature maps of muscle provide localization and dosimetry both in the focal region and near field.
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Abstract
OBJECTIVE The aim of this study was to evaluate a technique for real-time monitoring of tissue temperature and tracking of the heat source during minimally invasive thermal interventions such as focused ultrasound surgery. MATERIALS AND METHODS A temperature-sensitive NMR line scan pulse sequence was directed interactively from a workstation during the application of focused ultrasound to samples of excised bovine skeletal muscle. The NMR signal along a sensitive line was monitored during and after heating by means of a scrolling display on the workstation. RESULTS The temperature sensitivity was found to be approximately 2 degrees C with a time resolution of 300 ms along a line intersecting the ultrasonic focal point. Experimental temperature rises determined from the NMR signal showed close agreement with theoretical temperature behavior derived from the heat equation. Temperature quantitation capabilities were lost upon onset of thermal denaturation and coagulation. CONCLUSION This technique could serve as a noninvasive guide in tracking the heat source and in monitoring thermal dose during focused ultrasound surgery and other minimally invasive thermal interventions.
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Abstract
A demonstration of MR guided thermal surgery involved experiments with imaging of focused ultrasound in an MRI system, measurements of the thermal transients and a thermal analysis of the resulting images. Both the heat distribution and the creation of focused ultrasound lesions in gel phantoms, in vitro bovine muscle and in vivo rabbit muscle were monitored with magnetic resonance imaging. Thermal surgical procedures were modeled by an elongated gaussian heat source where heat flow is controlled by tissue thermal properties and tissue perfusion. Temperature profiles were measured with thermocouples or calculated from magnetic resonance imaging in agreement with the model. A 2-s T1-weighted gradient-refocused acquisition provided thermal profiles needed to localize the heat distribution produced by a 4-s focused ultrasound pulse. Thermal analysis of the images give an effective thermal diffusion coefficient of 0.0015 cm2/s in gel and 0.0033 cm2/s in muscle. The lesions were detected using a T2-weighted spin-echo or fast spin-echo pulse sequence in agreement with muscle tissue sections. Potential thermal surgery applications are in the prostate, liver, kidney, bladder, breast, eye and brain.
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Real-time acquisition, display, and interactive graphic control of NMR cardiac profiles and images. Magn Reson Med 1993; 29:667-73. [PMID: 8505903 DOI: 10.1002/mrm.1910290514] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A highly interactive MRI scanner interface has been developed that allows, for the first time, real-time graphic control of one-dimensional (1D) and two-dimensional (2D) cardiac MRI exams. The system comprises a Mercury array processor (AP) in a Sun SPARCserver with two connections to the MRI scanner, a data link that passes the NMR data directly to the AP as they are collected, and a control link that passes commands from the Sun to the scanner to redirect the imaging pulse sequence in real time. In the 1D techniques, a cylinder or "pencil" of magnetization is repeatedly excited using gradient-echo or spin-echo line-scan sequences, with the magnetization read out each time along the length of the cylinder, and a scrolling display generated on the Sun monitor. Rubber-band lines drawn on the scout image redirect the pencil or imaging slice to different locations, with the changes immediately visible in the display. M-mode imaging, 1D flow imaging, and 2D fast cardiac imaging have been demonstrated on normal volunteers using this system. This platform represents an operator-"friendly" way of directing real-time imaging of the heart.
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Abstract
Magnetic resonance guided focused ultrasound surgery provides a minimally invasive controlled method for selectively destroying deep-lying tissue. A thermal analysis of focused ultrasound provides an estimate of the time-dependent temperature distribution and thermal dose required for ultrasound surgery. The temperature distribution is estimated by accumulating heat sources, considering the effects of thermal conductivity, heat content, and perfusion. In this study, both gel phantoms and excised in vitro bovine muscle specimens were imaged in a 1.5 T MR system while heated with a 5 cm diameter, 10 cm focal length, 1.1 MHz transducer. During sonication, the thermal effects were observed with T1-weighted pulse sequences. Below a critical temperature, the heat zone appeared as a dark spot that moved with the focal spot. Above a critical thermal dose, the in vitro tissue was irreversibly altered and the focal lesion was observed on both the MR image and the specimen slice.
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Mode conversion of Rayleigh and Lamb waves to compression waves at a metal-liquid interface. ULTRASONICS 1981; 19:249-258. [PMID: 7292773 DOI: 10.1016/0041-624x(81)90014-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
A theoretical treatment is given of a potentially useful ultrasonic mode-conversion process, from Rayleigh or Lamb waves (SAW's) to angled compression waves in an adjacent liquid. Since the compression waves can form a well-defined beam, with typical angular width of only 1 degree or 2 degrees, it is possible to use this technique in under-liquid viewing applications. Another use, in liquid level measurement, has advantages over conventional ultrasonic methods. Attractive features are the high power efficiency of the mode-conversion, in both directions, and its inherent separation of electromechanical transducer from the liquid, which may be vital in certain hazardous environments. With such applications in mind, the emphasis here is on ultrasonic processes in the liquid. After a descriptive account of pressure wave generation in the liquid, the main part of the paper is a general treatment of far-field beam profiles and includes transverse beam-width and discussion of pulsed operation. Finally we examine inverse mode conversion (compression wave to SAW), to identify the main physical processes occurring and arrive at a figure for power efficiency. This turns out to be 80% (max) against nearly 100% for transmission.
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Flight-deck vision of professional pilots. AEROSPACE MEDICINE 1970; 41:337-42. [PMID: 5417376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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