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Toffessi Siewe S, Callé S, Vander Meulen F, Valente D, Grégoire JM, Banquart A, Chevalliot S, Capri A, Levassort F. High Acoustic Impedance and Attenuation Backing for High-Frequency Focused P(VDF-TrFE)-Based Transducers. SENSORS (BASEL, SWITZERLAND) 2023; 23:4686. [PMID: 37430599 DOI: 10.3390/s23104686] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 04/28/2023] [Accepted: 05/09/2023] [Indexed: 07/12/2023]
Abstract
Backing materials with tailored acoustic properties are beneficial for miniaturized ultrasonic transducer design. Whereas piezoelectric P(VDF-TrFE) films are common elements in high-frequency (>20 MHz) transducer design, their low coupling coefficient limits their sensitivity. Defining a suitable sensitivity-bandwidth trade-off for miniaturized high-frequency applications requires backings with impedances of >25 MRayl and strongly attenuating to account for miniaturized requirements. The motivation of this work is related to several medical applications such as small animal, skin or eye imaging. Simulations showed that increasing the acoustic impedance of the backing from 4.5 to 25 MRayl increases transducer sensitivity by 5 dB but decreases the bandwidth, which nevertheless remains high enough for the targeted applications. In this paper, porous sintered bronze material with spherically shaped grains, size-adapted for 25-30 MHz frequency, was impregnated with tin or epoxy resin to create multiphasic metallic backings. Microstructural characterizations of these new multiphasic composites showed that impregnation was incomplete and that a third air phase was present. The selected composites, sintered bronze-tin-air and sintered bronze-epoxy-air, at 5-35 MHz characterization, produced attenuation coefficients of 1.2 and >4 dB/mm/MHz and impedances of 32.4 and 26.4 MRayl, respectively. High-impedance composites were adopted as backing (thickness = 2 mm) to fabricate focused single-element P(VDF-TrFE)-based transducers (focal distance = 14 mm). The center frequency was 27 MHz, while the bandwidth at -6 dB was 65% for the sintered-bronze-tin-air-based transducer. We evaluated imaging performance using a pulse-echo system on a tungsten wire (diameter = 25 μm) phantom. Images confirmed the viability of integrating these backings in miniaturized transducers for imaging applications.
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Affiliation(s)
- Sean Toffessi Siewe
- GREMAN, UMR 7347, University of Tours, CNRS, INSA Centre Val de la Loire, 37200 Tours, France
- INSERM Imaging and Brain, UMR 1253, 37000 Tours, France
- Carestream Dental France, 77183 Croissy-Beaubourg, France
| | - Samuel Callé
- GREMAN, UMR 7347, University of Tours, CNRS, INSA Centre Val de la Loire, 37200 Tours, France
| | - François Vander Meulen
- GREMAN, UMR 7347, University of Tours, CNRS, INSA Centre Val de la Loire, 37200 Tours, France
| | - Damien Valente
- GREMAN, UMR 7347, University of Tours, CNRS, INSA Centre Val de la Loire, 37200 Tours, France
| | | | - Aline Banquart
- Carestream Dental France, 77183 Croissy-Beaubourg, France
| | | | - Arnaud Capri
- Carestream Dental France, 77183 Croissy-Beaubourg, France
| | - Franck Levassort
- GREMAN, UMR 7347, University of Tours, CNRS, INSA Centre Val de la Loire, 37200 Tours, France
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Orlova A, Pavlova K, Kurnikov A, Maslennikova A, Myagcheva M, Zakharov E, Skamnitskiy D, Perekatova V, Khilov A, Kovalchuk A, Moiseev A, Turchin I, Razansky D, Subochev P. Noninvasive optoacoustic microangiography reveals dose and size dependency of radiation-induced deep tumor vasculature remodeling. Neoplasia 2022; 26:100778. [PMID: 35220045 PMCID: PMC8889238 DOI: 10.1016/j.neo.2022.100778] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 02/04/2022] [Accepted: 02/11/2022] [Indexed: 01/07/2023]
Abstract
Tumor microvascular responses may provide a sensitive readout indicative of radiation therapy efficacy, its time course and dose dependencies. However, direct high-resolution observation and longitudinal monitoring of large-scale microvascular remodeling in deep tissues remained challenging with the conventional microscopy approaches. We report on a non-invasive longitudinal study of morphological and functional neovascular responses by means of scanning optoacoustic (ОА) microangiography. In vivo imaging of CT26 tumor response to a single irradiation at varying dose (6, 12, and 18 Gy) has been performed over ten days following treatment. Tumor oxygenation levels were further estimated using diffuse optical spectroscopy (DOS) with a contact fiber probe. OA revealed the formation of extended vascular structures on the whole tumor scale during its proliferation, whereas only short fragmented vascular regions were identified following irradiation. On the first day post treatment, a decrease in the density of small (capillary-sized) and medium-sized vessels was revealed, accompanied by an increase in their fragmentation. Larger vessels exhibited an increase in their density accompanied by a decline in the number of vascular segments. Short-lasting response has been observed after 6 and 12 Gy irradiations, whereas 18 Gy treatment resulted in prolonged responses, up to the tenth day after irradiation. DOS measurements further revealed a delayed increase of tumor oxygenation levels for 18 Gy irradiations, commencing on the sixth day post treatment. The ameliorated oxygenation is attributed to diminished oxygen consumption by inhibited tumor cells but not to the elevation of oxygen supply. This work is the first to demonstrate the differential (size-dependent) nature of vascular responses to radiation treatments at varying doses in vivo. The OA approach thus facilitates the study of radiation-induced vascular changes in an unperturbed in vivo environment while enabling deep tissue high-resolution observations at the whole tumor scale.
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Zhang Q, Piao S, Chen H, Wu J, Nakamura K. A Linear Piezoelectric Actuator Using "A-Shaped" Structure. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2022; 69:1382-1391. [PMID: 35073260 DOI: 10.1109/tuffc.2022.3145366] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A new design of linear piezoelectric actuator using "A-shaped" structure was proposed, designed, fabricated, and tested. By fusion design of the piezoelectric transducer and the mechanical structure, the proposed actuator only uses the first bending vibration of the center piezoelectric transducer to work. Frequency degeneration is no longer needed, which enables the actuator to adjust its structural parameters according to the application conditions. When applying an alternating voltage at resonance frequency, the center piezoelectric transducer will be stimulated in the first bending vibration. The vibration energy transmitted to the two driving arms generates alternating tilting movements with a phase difference of 180° between the two driving feet, which enables the actuator to push the linear guide when a vertical preload is applied. Under the preload of 120 N, the actuator gained a maximum thrust force of 9.8 N and a maximum output power of 0.62 W with a self-weight of 0.061 kg. The maximum output thrust density and the maximum output power density were 160.6 N/kg and 10.2 W/kg, respectively.
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Babazadeh Khameneh A, Chabok HR, Nejat Pishkenari H. Optimized integrated design of a high-frequency medical ultrasound transducer with genetic algorithm. SN APPLIED SCIENCES 2021. [DOI: 10.1007/s42452-021-04627-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
AbstractDesigning efficient acoustic stack and elements for high-frequency (HF) medical ultrasound (US) transducers involves various interrelated parameters. So far, optimizing spatial resolution and acoustic field intensity simultaneously has been a daunting task in the area of HF medical US imaging. Here, we introduce optimized design for a 50-MHz US probe for skin tissue imaging. We have developed an efficient design and simulation approach using Krimholtz, Leedom and Matthaei (KLM) equivalent circuit model and spatial impulse response method by means of Field II software. These KLM model and Field II software are integrated, and a GA algorithm is used to optimize the design of the US transducer to obtain the best imaging performance. As a result, a 50-MHz single element probe is effectively optimized with 5 mm acoustic focal length, 72 $$\upmu {\text{m}}$$
μ
m
lateral, and 42 $$\upmu {\text{m}}$$
μ
m
axial imaging resolution, with an enhancement in imaging resolution over the conventionally designed and simulated probe by 10%. This work has the potential to benefit many applications that require a fast, high-resolution and strong US focus in skin imaging.
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Frequency dependence of attenuation and backscatter coefficient of ex vivo human lymphedema dermis. J Med Ultrason (2001) 2019; 47:25-34. [DOI: 10.1007/s10396-019-00973-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 07/26/2019] [Indexed: 11/25/2022]
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Arkan EF, Degertekin FL. Analysis and Design of High-Frequency 1-D CMUT Imaging Arrays in Noncollapsed Mode. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2019; 66:382-393. [PMID: 30571620 PMCID: PMC6415772 DOI: 10.1109/tuffc.2018.2887043] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
High-frequency ultrasound imaging arrays are important for a broad range of applications, from small animal imaging to photoacoustics. Capacitive micromachined ultrasonic transducer (CMUT) arrays are particularly attractive for these applications as low noise receiver electronics can be integrated for an overall improved performance. In this paper, we present a comprehensive analysis of high-frequency CMUT arrays based on an experimentally verified CMUT array simulation tool. The results obtained on an example, a 40-MHz 1-D CMUT array for intravascular imaging, are used to obtain key design insights and tradeoffs for receive only and pulse-echo imaging. For the receiver side, thermal mechanical current noise, plane wave pressure sensitivity, and pressure noise spectrum are extracted from simulations. Using these parameters, we find that the receiver performance of CMUT arrays can be close to an ideal piston, independent of gap thickness, and applied dc bias, when coupled to low noise electronics with arrays utilizing smaller membranes performing better. For pulse-echo imaging, thermal mechanical current noise limited signal-to-noise ratio is observed to be dependent on the maximum available voltage and gap thickness. In terms of bandwidth, we find that the Bragg resonance of the array, related to the fill factor, is a significant determinant of the high frequency limit and the fluid loaded single membrane resonance determines the lower limit. Based on these results, we present design guidelines requiring only fluid loaded single membrane simulations and membrane pitch to achieve a desired pulse-echo response. We also provide a design example and discuss limitations of the approach.
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Sugawara T, Nakagawa N, Shimizu N, Hirai N, Saijo Y, Sakai S. Gender- and age-related differences in facial sebaceous glands in Asian skin, as observed by non-invasive analysis using three-dimensional ultrasound microscopy. Skin Res Technol 2019; 25:347-354. [PMID: 30609153 DOI: 10.1111/srt.12657] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 09/30/2018] [Accepted: 12/08/2018] [Indexed: 11/28/2022]
Abstract
BACKGROUND While determining sebaceous gland morphology is useful in the treatment of skin disorders such as acne, a non-invasive assessment method has not been developed. Since age and gender affect sebum level, differences in sebaceous gland morphology according to these factors were investigated. METHODS Facial skin was measured using a high-frequency three-dimensional ultrasound microscope. First, the ultrasound images were compared with skin sections. Next, we assessed sebaceous gland morphology. Images of sebaceous gland in the cheeks of young male, young female and elderly female subjects were obtained using ultrasound microscopy, and en face images were processed to measure the sebaceous gland area. RESULTS In the ultrasound images, sebaceous glands and also thin collagen fibers, which surrounded the glands, could be detected as low-intensity regions. We called them sebaceous units. In young male subjects, the sebaceous unit areas 900-μm beneath the skin surface were larger than those at 700 μm. In contrast, depth-dependent differences in sebaceous unit area were not observed in young female subjects, indicating that males had cauliflower-shaped sebaceous glands while young females had somewhat more cylindrical and smaller sebaceous glands than the young males. Regarding age, the areas of sebaceous units at 900 μm were diminished and the depth of maximum area was shallower in elderly female subjects compared to young female subjects. Hence, sebaceous glands are considered to shrink with age. CONCLUSION Differences in facial sebaceous unit morphology between genders as well as by age groups could be observed using high-frequency ultrasound microscopy.
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Affiliation(s)
- Tomoko Sugawara
- Skin Care Products Research, Kao Corporation, Odawara, Kanagawa, Japan
| | - Noriaki Nakagawa
- Skin Care Products Research, Kao Corporation, Odawara, Kanagawa, Japan
| | - Norio Shimizu
- Skin Care Products Research, Kao Corporation, Odawara, Kanagawa, Japan
| | - Nami Hirai
- Skin Care Products Research, Kao Corporation, Odawara, Kanagawa, Japan
| | - Yoshifumi Saijo
- Biomedical Imaging Laboratory, Graduate School of Biomedical Engineering, Tohoku University, Sendai, Miyagi, Japan
| | - Shingo Sakai
- Skin Care Products Research, Kao Corporation, Odawara, Kanagawa, Japan
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Kumagai K, Yokoshiki S, Kobayashi K, Saijo Y. The Structure of Human Sebaceous Glands and Its Relation to Skin Viscoelasticity. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2018; 2018:3460-3463. [PMID: 30441128 DOI: 10.1109/embc.2018.8512966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
High-frequency ultrasound has realized high-resolution observation of deep part of the dermis in vivo. The size of sebaceous glands was evaluated by three-dimensional ultrasound microscopy with the ultrasonic frequency of 120 MHz. The viscoelasticity of the same regions was measured by well-established biomechanical equipment. There was no significant difference between the size of sebaceous glands in cheek and forearm. The skin's ability to recover to its initial position after deformation was significantly higher in forearm than in cheek. Both sizes of sebaceous glands in cheek and forearm were positively correlated with the parameter of viscoelasticity. The size of the sebaceous glands in the deep part of the dermis can be a parameter of skin viscoelasticity. High-frequency ultrasound imaging contributes to the evaluation of human skin morphology as well as functions.
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Newton VL, Bradley RS, Seroul P, Cherel M, Griffiths CEM, Rawlings AV, Voegeli R, Watson REB, Sherratt MJ. Novel approaches to characterize age-related remodelling of the dermal-epidermal junction in 2D, 3D andin vivo. Skin Res Technol 2016; 23:131-148. [DOI: 10.1111/srt.12312] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/21/2016] [Indexed: 12/21/2022]
Affiliation(s)
- V. L. Newton
- Centre for Dermatology Research; Institute of Inflammation & Repair; Manchester Academic Health Science Centre; University of Manchester; Manchester UK
- The Dermatology Centre; Salford Royal NHS Foundation Trust; Salford UK
| | - R. S. Bradley
- School of Materials; The University of Manchester; Manchester UK
| | | | | | - C. E. M. Griffiths
- Centre for Dermatology Research; Institute of Inflammation & Repair; Manchester Academic Health Science Centre; University of Manchester; Manchester UK
- The Dermatology Centre; Salford Royal NHS Foundation Trust; Salford UK
| | | | - R. Voegeli
- DSM Nutritional Products Ltd; Kaiseraugst Switzerland
| | - R. E. B. Watson
- Centre for Dermatology Research; Institute of Inflammation & Repair; Manchester Academic Health Science Centre; University of Manchester; Manchester UK
- The Dermatology Centre; Salford Royal NHS Foundation Trust; Salford UK
| | - M. J. Sherratt
- Centre for Tissue Injury and Repair; Institute of Inflammation & Repair; Manchester Academic Health Science Centre; The University of Manchester; Manchester UK
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Baran U, Choi WJ, Wang RK. Potential use of OCT-based microangiography in clinical dermatology. Skin Res Technol 2016; 22:238-246. [PMID: 26335451 PMCID: PMC4777681 DOI: 10.1111/srt.12255] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/29/2015] [Indexed: 11/26/2022]
Abstract
BACKGROUND Optical coherence tomography (OCT) is a revolutionary imaging technique used commonly in ophthalmology, and on the way to become clinically viable alternative in dermatology due to its capability of acquiring histopathology level details of in vivo tissue, non-invasively. In this study, we demonstrate the capabilities of OCT-based microangiography in detecting high resolution, three-dimensional structural, and microvascular features of in vivo human skin with various conditions. METHODS A swept-source OCT system that operates on a central wavelength of 1310 nm with an A-line rate of 100 kHz is used in this study. We apply optical microangiography (OMAG) technique to visualize the structural and microvascular changes in tissue. RESULTS OMAG images provide detailed visualization of functional microvasculature of healthy human skin from cheek and forehead areas, abnormal skin conditions from face, chest and belly. Moreover, OMAG is capable of monitoring the progress of wound healing on human skin from arm, delivering unprecedented detail of microstructural and microvascular information during longitudinal wound healing process. CONCLUSION The presented results promise the clinical use of OCT angiography, aiming to treat prevalent cutaneous diseases, by detecting blood perfusion, and structural changes within human skin, in vivo.
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Affiliation(s)
- Utku Baran
- Department of Bioengineering, University of Washington, Seattle, WA, USA
- Department of Electrical Engineering, University of Washington, Seattle, WA, USA
| | - Woo June Choi
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Ruikang K. Wang
- Department of Bioengineering, University of Washington, Seattle, WA, USA
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11
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Blitz AM, Aygun N, Herzka DA. Invited Commentary: The Rise of Microradiology. Radiographics 2016; 35:1091-3. [PMID: 26172353 DOI: 10.1148/rg.2015140311] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ari M Blitz
- Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University Baltimore, Maryland.,Department of Biomedical Engineering, Johns Hopkins University School of Medicine Baltimore, Maryland
| | - Nafi Aygun
- Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University Baltimore, Maryland.,Department of Biomedical Engineering, Johns Hopkins University School of Medicine Baltimore, Maryland
| | - Daniel A Herzka
- Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University Baltimore, Maryland.,Department of Biomedical Engineering, Johns Hopkins University School of Medicine Baltimore, Maryland
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12
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[Methods for measuring skin aging]. Hautarzt 2016; 67:117-24. [PMID: 26746403 DOI: 10.1007/s00105-015-3752-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Aging affects human skin and is becoming increasingly important with regard to medical, social and aesthetic issues. Detection of intrinsic and extrinsic components of skin aging requires reliable measurement methods. Modern techniques, e.g., based on direct imaging, spectroscopy or skin physiological measurements, provide a broad spectrum of parameters for different applications.
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13
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Leachman SA, Cassidy PB, Chen SC, Curiel C, Geller A, Gareau D, Pellacani G, Grichnik JM, Malvehy J, North J, Jacques SL, Petrie T, Puig S, Swetter SM, Tofte S, Weinstock MA. Methods of Melanoma Detection. Cancer Treat Res 2016; 167:51-105. [PMID: 26601859 DOI: 10.1007/978-3-319-22539-5_3] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Detection and removal of melanoma, before it has metastasized, dramatically improves prognosis and survival. The purpose of this chapter is to (1) summarize current methods of melanoma detection and (2) review state-of-the-art detection methods and technologies that have the potential to reduce melanoma mortality. Current strategies for the detection of melanoma range from population-based educational campaigns and screening to the use of algorithm-driven imaging technologies and performance of assays that identify markers of transformation. This chapter will begin by describing state-of-the-art methods for educating and increasing awareness of at-risk individuals and for performing comprehensive screening examinations. Standard and advanced photographic methods designed to improve reliability and reproducibility of the clinical examination will also be reviewed. Devices that magnify and/or enhance malignant features of individual melanocytic lesions (and algorithms that are available to interpret the results obtained from these devices) will be compared and contrasted. In vivo confocal microscopy and other cellular-level in vivo technologies will be compared to traditional tissue biopsy, and the role of a noninvasive "optical biopsy" in the clinical setting will be discussed. Finally, cellular and molecular methods that have been applied to the diagnosis of melanoma, such as comparative genomic hybridization (CGH), fluorescent in situ hybridization (FISH), and quantitative reverse transcriptase polymerase chain reaction (qRT-PCR), will be discussed.
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Affiliation(s)
- Sancy A Leachman
- Department of Dermatology and Knight Cancer Institute, Oregon Health and Science University, 3303 SW Bond Avenue, CH16D, Portland, OR, 97239, USA.
| | - Pamela B Cassidy
- Department of Dermatology and Knight Cancer Institute, Oregon Health and Science University, 3125 SW Sam Jackson Park Road, L468R, Portland, OR, 97239, USA.
| | - Suephy C Chen
- Department of Dermatology, Emory University School of Medicine, 1525 Clifton Road NE, 1st Floor, Atlanta, GA, 30322, USA.
| | - Clara Curiel
- Department of Dermatology and Arizona Cancer Center, University of Arizona, 1515 N Campbell Avenue, Tucson, AZ, 85721, USA.
| | - Alan Geller
- Department of Dermatology, Harvard School of Public Health and Massachusetts General Hospital, Landmark Center, 401 Park Drive, 3rd Floor East, Boston, MA, 02215, USA.
| | - Daniel Gareau
- Laboratory of Investigative Dermatology, The Rockefeller University, 1230 York Avenue, New York, NY, 10065, USA.
| | - Giovanni Pellacani
- Department of Dermatology, University of Modena and Reggio Emilia, Via del Pozzo 71, Modena, Italy.
| | - James M Grichnik
- Department of Dermatology and Cutaneous Surgery, University of Miami School of Medicine, Room 912, BRB (R-125), 1501 NW 10th Avenue, Miami, FL, 33136, USA.
| | - Josep Malvehy
- Melanoma Unit, Dermatology Department, Hospital Clinic Barcelona, Villarroel 170, 08036, Barcelona, Spain.
| | - Jeffrey North
- University of California, San Francisco, 1701 Divisadero Street, Suite 280, San Francisco, CA, 94115, USA.
| | - Steven L Jacques
- Department of Biomedical Engineering and Dermatology, Oregon Health and Science University, 3303 SW Bond Avenue, CH13B, Portland, OR, 97239, USA.
| | - Tracy Petrie
- Department of Biomedical Engineering, Oregon Health and Science University, 3303 SW Bond Avenue, CH13B, Portland, OR, 97239, USA.
| | - Susana Puig
- Melanoma Unit, Dermatology Department, Hospital Clinic Barcelona, Villarroel 170, 08036, Barcelona, Spain.
| | - Susan M Swetter
- Department of Dermatology/Cutaneous Oncology, Stanford University, 900 Blake Wilbur Drive, W3045, Stanford, CA, 94305, USA.
| | - Susan Tofte
- Department of Dermatology, Oregon Health and Science University, 3303 SW Bond Avenue, CH16D, Portland, OR, 97239, USA.
| | - Martin A Weinstock
- Departments of Dermatology and Epidemiology, Brown University, V A Medical Center 111D, 830 Chalkstone Avenue, Providence, RI, 02908, USA.
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Ultrasound biomicroscopy (UBM) and scanning acoustic microscopy (SAM) for the assessment of hernia mesh integration: a comparison to standard histology in an experimental model. Hernia 2013; 18:579-85. [PMID: 24346242 DOI: 10.1007/s10029-013-1201-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Accepted: 12/03/2013] [Indexed: 10/25/2022]
Abstract
BACKGROUND Mesh integration is a key parameter for reliable and safe hernia repair. So far, its assessment is based on histology obtained from rare second-look operations or experimental research. Therefore, non-invasive high-resolution imaging techniques would be of great value. Ultrasound biomicroscopy (UBM) and scanning acoustic microscopy (SAM) have shown potential in the imaging of hard and soft tissues. This experimental study compared the detection of mesh integration, foreign body reaction and scar formation in UBM/SAM with standard histology. MATERIALS AND METHODS Ten titanized polypropylene meshes were implanted in rats in a model of onlay repair. 17 days postoperative animals were killed and samples were paraffin embedded for histology (H&E, Cresyl violet) or processed for postmortem UBM/SAM. The observation period was uneventful and meshes appeared well integrated. RESULTS Relocation of neighboring cross-sectional levels could easily be achieved with the 40-MHz UBM and granulation tissue could be distinguished from adjacent muscle tissue layers. The spatial resolution of approximately 8 μm of the 200-MHz UBM system images was comparable to standard histology (2.5-5× magnification) and allowed a clear identification of mesh fibers and different tissue types, e.g., scar, fat, granulation, and muscle tissues, as well as vessels, abscedations, and foreign body giant cell clusters. CONCLUSION This pilot study demonstrates the potential of high-frequency ultrasound to assess hernia mesh integration non-invasively. Although the methods lack cell-specific information, tissue integration could reliably be assessed. The possibility of conducting UBM in vivo advocates this method as a guidance tool for the indication of second-look operations and subsequent elaborate histological analyses.
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Hinde E, Haslam IS, Schneider MR, Langan EA, Kloepper JE, Schramm C, Zouboulis CC, Paus R. A practical guide for the study of human and murine sebaceous glandsin situ. Exp Dermatol 2013; 22:631-7. [DOI: 10.1111/exd.12207] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/26/2013] [Indexed: 12/13/2022]
Affiliation(s)
- Eleanor Hinde
- Institute of Inflammation and Repair; University of Manchester; Manchester; UK
| | - Iain S. Haslam
- Institute of Inflammation and Repair; University of Manchester; Manchester; UK
| | - Marlon R. Schneider
- Institute of Molecular Animal Breeding and Biotechnology; Gene Center; LMU Munich; Munich; Germany
| | | | | | | | - Christos C. Zouboulis
- Departments of Dermatology, Venereology, Allergology and Immunology; Dessau Medical Center; Dessau; Germany
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16
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Nagaoka R, Kobayashi K, Saijo Y. Relation between morphology of sebaceous glands inside human skin and viscoelastic properties. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2013; 2013:1112-1115. [PMID: 24109887 DOI: 10.1109/embc.2013.6609700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Three-dimensional ultrasound microscopy with the central frequency of 120 MHz made it possible to observe in vivo sebaceous glands at the deep part of the dermis at microscopic level. The deformation displacements were measured by an established testing device, and the viscoelasticity was estimated from the measured displacements and Voigt model. The occupancy, density or average size of sebaceous glands was compared with the viscoleasticity. There were three major findings in the comparisons. First, the occupancy of sebaceous gland showed negative correlation with the elasticity. Second, the density of sebaceous glands showed positive correlation with the viscosity. Third, the average size of sebaceous glands showed negative correlation with the viscosity. In conclusion, viscoelastic property of human skin is strongly influenced by the morphology of the sebaceous glands.
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