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Ogier AC, Rapacchi S, Bellemare ME. Four-dimensional reconstruction and characterization of bladder deformations. Comput Methods Programs Biomed 2023; 237:107569. [PMID: 37186971 DOI: 10.1016/j.cmpb.2023.107569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 03/31/2023] [Accepted: 04/24/2023] [Indexed: 05/17/2023]
Abstract
BACKGROUND AND OBJECTIVE Pelvic floor disorders are prevalent diseases and patient care remains difficult as the dynamics of the pelvic floor remains poorly understood. So far, only 2D dynamic observations of straining exercises at excretion are available in the clinics and 3D mechanical defects of pelvic organs are not well studied. In this context, we propose a complete methodology for the 3D representation of non-reversible bladder deformations during exercises, combined with a 3D representation of the location of the highest strain areas on the organ surface. METHODS Novel image segmentation and registration approaches have been combined with three geometrical configurations of up-to-date rapid dynamic multi-slice MRI acquisitions for the reconstruction of real-time dynamic bladder volumes. RESULTS For the first time, we proposed real-time 3D deformation fields of the bladder under strain from in-bore forced breathing exercises. The potential of our method was assessed on eight control subjects undergoing forced breathing exercises. We obtained average volume deviations of the reconstructed dynamic volume of bladders around 2.5% and high registration accuracy with mean distance values of 0.4 ± 0.3 mm and Hausdorff distance values of 2.2 ± 1.1 mm. CONCLUSIONS The proposed framework provides proper 3D+t spatial tracking of non-reversible bladder deformations. This has immediate applicability in clinical settings for a better understanding of pelvic organ prolapse pathophysiology. This work can be extended to patients with cavity filling or excretion problems to better characterize the severity of pelvic floor pathologies or to be used for preoperative surgical planning.
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Affiliation(s)
- Augustin C Ogier
- Aix Marseille Univ, Universite de Toulon, CNRS, LIS, Marseille, France.
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Meng X, Wu Y, Wang X, Xiong X, Sun Y. Analysis of tissue volume and calcification of the 6th to 8th costal cartilage in 70 woman patients. J Plast Reconstr Aesthet Surg 2022; 75:2727-2734. [PMID: 35379585 DOI: 10.1016/j.bjps.2022.02.033] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 01/20/2022] [Accepted: 02/15/2022] [Indexed: 11/17/2022]
Abstract
BACKGROUND To study the tissue size, calcification characteristics and the correlation between calcification, age, and on whether side of the 6th, 7th, and 8th costal cartilages in women, so as to provide reference for clinical application. METHODS A total of 70 cases of female costal cartilage applied with dual-source CT three-dimensional reconstruction were selected from the radiology storage center of Second Xiangya Hospital. The length, width, thickness, calcification rate, calcification degree, calcification type, calcification location, and the relation between calcification, age, and side of bilateral 6th, 7th, and 8th costal cartilages were observed and analyzed on volume reconstruction and maximum density projection images. RESULTS (1) The respective length, width, and thickness of 6th, 7th, and 8th costal cartilages on both sides were measured. There were significant differences in length, width, and thickness between unilateral costal cartilages with different ordinal numbers. (2) Significant difference was confirmed in the total calcification types of the 6th, 7th, and 8th costal cartilages. (3) The higher the age, the higher the calcification rate was. The calcification degree of the 6th, 7th, and 8th costal cartilages was higher with the increase of age. CONCLUSIONS Preoperative three-dimensional reconstruction and image post-processing of costal cartilage with dual-source CT can accurately measure the amount of cartilage tissue and define the characteristics of calcification, so as to guide the clinical selection of costal cartilage. In female patients of different ages, the calcification rate of costal cartilage increased with age, but no positive correlation was observed.
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Affiliation(s)
- Xianxi Meng
- Department of Plastic and Aesthetic (Burn) Surgery, Second Xiangya Hospital, Central South University, Hunan, China
| | - Ying Wu
- Department of Plastic and Aesthetic (Burn) Surgery, Second Xiangya Hospital, Central South University, Hunan, China
| | - Xiancheng Wang
- Department of Plastic and Aesthetic (Burn) Surgery, Second Xiangya Hospital, Central South University, Hunan, China.
| | - Xiang Xiong
- Department of Plastic and Aesthetic (Burn) Surgery, Second Xiangya Hospital, Central South University, Hunan, China
| | - Yang Sun
- Department of Plastic and Aesthetic (Burn) Surgery, Second Xiangya Hospital, Central South University, Hunan, China
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Fatima A, Venkatesh AS, Mukherjee R, Agrawal AK, Singh B, Sarkar PS, Kashyap Y, Shripathi T. 3D spatial distribution of ore mineral phases using high resolution synchrotron micro-computed tomography (μCT) combined with optical microscopy. Appl Radiat Isot 2019; 148:49-59. [PMID: 30921617 DOI: 10.1016/j.apradiso.2019.03.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 02/28/2019] [Accepted: 03/06/2019] [Indexed: 11/24/2022]
Abstract
Ore minerals in dolomites and Graphite Mica Schist (GMS) were studied by synchrotron radiation micro-computed tomography (SR-μCT) and optical microscopy. High resolution μCT images of ore minerals were obtained at Imaging Beamline (BL-4), Indus-2 synchrotron radiation source for the comprehensive volume characterization of minerals. Optical microscopy was used for mineral identification, mineral/rock characterization and quantification of ore mineral assemblages was also confirmed by XRD. 3D images from SR-μCT have shown spatial distribution of major minerals and crystals of different minerals in the volume of samples. The results obtained shows that the GMS and dolomitic hosted rocks mined from region near Udaipur, Rajasthan contains sulfide mineral phases. SR-μCT facilitates visualization of the association of the various metallic minerals with the host rock. The presence of economically important metallic minerals galena, sphalerite and pyrite found in the samples through SR-μCT has implications on exploration and processing of ores.
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Affiliation(s)
- A Fatima
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, India.
| | - A S Venkatesh
- Department of Applied Geology, Indian Institute of Technology (Indian School of Mines), Dhanbad, India
| | - R Mukherjee
- Department of Applied Geology, Indian Institute of Technology (Indian School of Mines), Dhanbad, India
| | - A K Agrawal
- Technical Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - B Singh
- Technical Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - P S Sarkar
- Technical Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - Y Kashyap
- Technical Physics Division, Bhabha Atomic Research Center, Trombay, Mumbai, India
| | - T Shripathi
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore, India
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Burel A, Lavault MT, Chevalier C, Gnaegi H, Prigent S, Mucciolo A, Dutertre S, Humbel BM, Guillaudeux T, Kolotuev I. A targeted 3D EM and correlative microscopy method using SEM array tomography. Development 2018; 145:dev.160879. [PMID: 29802150 DOI: 10.1242/dev.160879] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 05/16/2018] [Indexed: 12/15/2022]
Abstract
Using electron microscopy to localize rare cellular events or structures in complex tissue is challenging. Correlative light and electron microscopy procedures have been developed to link fluorescent protein expression with ultrastructural resolution. Here, we present an optimized scanning electron microscopy (SEM) workflow for volumetric array tomography for asymmetric samples and model organisms (Caenorhabditis elegans, Drosophila melanogaster, Danio rerio). We modified a diamond knife to simplify serial section array acquisition with minimal artifacts. After array acquisition, the arrays were transferred to a glass coverslip or silicon wafer support. Using light microscopy, the arrays were screened rapidly for initial recognition of global anatomical features (organs or body traits). Then, using SEM, an in-depth study of the cells and/or organs of interest was performed. Our manual and automatic data acquisition strategies make 3D data acquisition and correlation simpler and more precise than alternative methods. This method can be used to address questions in cell and developmental biology that require the efficient identification of a labeled cell or organelle.
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Affiliation(s)
- Agnes Burel
- University of Rennes 1, UMS Biosit, MRic, 35043 Rennes, France
| | | | | | | | - Sylvain Prigent
- University of Rennes 1, UMS Biosit, MRic, 35043 Rennes, France
| | - Antonio Mucciolo
- University of Lausanne, Faculté de biologie et de médecine, Electron Microscopy Facility, CH-1015 Lausanne, Switzerland
| | | | - Bruno M Humbel
- University of Lausanne, Faculté de biologie et de médecine, Electron Microscopy Facility, CH-1015 Lausanne, Switzerland
| | | | - Irina Kolotuev
- University of Rennes 1, UMS Biosit, MRic, 35043 Rennes, France .,University of Lausanne, Faculté de biologie et de médecine, Electron Microscopy Facility, CH-1015 Lausanne, Switzerland
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Bouwer JC, Deerinck TJ, Bushong E, Astakhov V, Ramachandra R, Peltier ST, Ellisman MH. Deceleration of probe beam by stage bias potential improves resolution of serial block-face scanning electron microscopic images. ACTA ACUST UNITED AC 2016; 2:11. [PMID: 27695667 PMCID: PMC5025511 DOI: 10.1186/s40679-016-0025-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 09/09/2016] [Indexed: 11/30/2022]
Abstract
Serial block-face scanning electron microscopy (SBEM) is quickly becoming an important imaging tool to explore three-dimensional biological structure across spatial scales. At probe-beam-electron energies of 2.0 keV or lower, the axial resolution should improve, because there is less primary electron penetration into the block face. More specifically, at these lower energies, the interaction volume is much smaller, and therefore, surface detail is more highly resolved. However, the backscattered electron yield for metal contrast agents and the backscattered electron detector sensitivity are both sub-optimal at these lower energies, thus negating the gain in axial resolution. We found that the application of a negative voltage (reversal potential) applied to a modified SBEM stage creates a tunable electric field at the sample. This field can be used to decrease the probe-beam-landing energy and, at the same time, alter the trajectory of the signal to increase the signal collected by the detector. With decelerated low landing-energy electrons, we observed that the probe-beam-electron-penetration depth was reduced to less than 30 nm in epoxy-embedded biological specimens. Concurrently, a large increase in recorded signal occurred due to the re-acceleration of BSEs in the bias field towards the objective pole piece where the detector is located. By tuning the bias field, we were able to manipulate the trajectories of the primary and secondary electrons, enabling the spatial discrimination of these signals using an advanced ring-type BSE detector configuration or a standard monolithic BSE detector coupled with a blocking aperture.
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Affiliation(s)
- James C Bouwer
- National Center for Microscopy and Imaging Research, University of California at San Diego, BSB 1000, 9500 Gilman Dr., La Jolla, CA 92093-0608 USA
| | - Thomas J Deerinck
- National Center for Microscopy and Imaging Research, University of California at San Diego, BSB 1000, 9500 Gilman Dr., La Jolla, CA 92093-0608 USA
| | - Eric Bushong
- National Center for Microscopy and Imaging Research, University of California at San Diego, BSB 1000, 9500 Gilman Dr., La Jolla, CA 92093-0608 USA
| | - Vadim Astakhov
- National Center for Microscopy and Imaging Research, University of California at San Diego, BSB 1000, 9500 Gilman Dr., La Jolla, CA 92093-0608 USA
| | - Ranjan Ramachandra
- National Center for Microscopy and Imaging Research, University of California at San Diego, BSB 1000, 9500 Gilman Dr., La Jolla, CA 92093-0608 USA
| | - Steven T Peltier
- National Center for Microscopy and Imaging Research, University of California at San Diego, BSB 1000, 9500 Gilman Dr., La Jolla, CA 92093-0608 USA
| | - Mark H Ellisman
- National Center for Microscopy and Imaging Research, University of California at San Diego, BSB 1000, 9500 Gilman Dr., La Jolla, CA 92093-0608 USA
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