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Stojanović M, Čolović MB, Lalatović J, Milosavljević A, Savić ND, Declerck K, Radosavljević B, Ćetković M, Kravić-Stevović T, Parac-Vogt TN, Krstić D. Monolacunary Wells-Dawson Polyoxometalate as a Novel Contrast Agent for Computed Tomography: A Comprehensive Study on In Vivo Toxicity and Biodistribution. Int J Mol Sci 2024; 25:2569. [PMID: 38473818 DOI: 10.3390/ijms25052569] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 02/12/2024] [Accepted: 02/14/2024] [Indexed: 03/14/2024] Open
Abstract
Polyoxotungstate nanoclusters have recently emerged as promising contrast agents for computed tomography (CT). In order to evaluate their clinical potential, in this study, we evaluated the in vitro CT imaging properties, potential toxic effects in vivo, and tissue distribution of monolacunary Wells-Dawson polyoxometalate, α2-K10P2W17O61.20H2O (mono-WD POM). Mono-WD POM showed superior X-ray attenuation compared to other tungsten-containing nanoclusters (its parent WD-POM and Keggin POM) and the standard iodine-based contrast agent (iohexol). The calculated X-ray attenuation linear slope for mono-WD POM was significantly higher compared to parent WD-POM, Keggin POM, and iohexol (5.97 ± 0.14 vs. 4.84 ± 0.05, 4.55 ± 0.16, and 4.30 ± 0.09, respectively). Acute oral (maximum-administered dose (MAD) = 960 mg/kg) and intravenous administration (1/10, 1/5, and 1/3 MAD) of mono-WD POM did not induce unexpected changes in rats' general habits or mortality. Results of blood gas analysis, CO-oximetry status, and the levels of electrolytes, glucose, lactate, creatinine, and BUN demonstrated a dose-dependent tendency 14 days after intravenous administration of mono-WD POM. The most significant differences compared to the control were observed for 1/3 MAD, being approximately seventy times higher than the typically used dose (0.015 mmol W/kg) of tungsten-based contrast agents. The highest tungsten deposition was found in the kidney (1/3 MAD-0.67 ± 0.12; 1/5 MAD-0.59 ± 0.07; 1/10 MAD-0.54 ± 0.05), which corresponded to detected morphological irregularities, electrolyte imbalance, and increased BUN levels.
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Affiliation(s)
- Marko Stojanović
- Department of Pharmacology, Clinical Pharmacology and Toxicology, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
| | - Mirjana B Čolović
- "Vinča" Institute of Nuclear Sciences-National Institute of the Republic of Serbia, University of Belgrade, 11351 Belgrade, Serbia
| | - Jovana Lalatović
- Department of Radiology, University Hospital Medical Center Bežanijska Kosa, 11080 Belgrade, Serbia
| | - Aleksandra Milosavljević
- Institute of Histology and Embryology, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
| | - Nada D Savić
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Kilian Declerck
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Branimir Radosavljević
- Institute of Medical Chemistry, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
| | - Mila Ćetković
- Institute of Histology and Embryology, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
| | - Tamara Kravić-Stevović
- Institute of Histology and Embryology, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
| | | | - Danijela Krstić
- Institute of Medical Chemistry, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
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Ahmad MY, Liu S, Tegafaw T, Saidi AKAA, Zhao D, Liu Y, Nam SW, Chang Y, Lee GH. Heavy Metal-Based Nanoparticles as High-Performance X-ray Computed Tomography Contrast Agents. Pharmaceuticals (Basel) 2023; 16:1463. [PMID: 37895934 PMCID: PMC10609879 DOI: 10.3390/ph16101463] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 10/01/2023] [Accepted: 10/13/2023] [Indexed: 10/29/2023] Open
Abstract
X-ray computed tomography (CT) contrast agents offer extremely valuable tools and techniques in diagnostics via contrast enhancements. Heavy metal-based nanoparticles (NPs) can provide high contrast in CT images due to the high density of heavy metal atoms with high X-ray attenuation coefficients that exceed that of iodine (I), which is currently used in hydrophilic organic CT contrast agents. Nontoxicity and colloidal stability are vital characteristics in designing heavy metal-based NPs as CT contrast agents. In addition, a small particle size is desirable for in vivo renal excretion. In vitro phantom imaging studies have been performed to obtain X-ray attenuation efficiency, which is a critical parameter for CT contrast agents, and the imaging performance of CT contrast agents has been demonstrated via in vivo experiments. In this review, we focus on the in vitro and in vivo studies of various heavy metal-based NPs in pure metallic or chemical forms, including Au, Pt, Pd, Ag, Ce, Gd, Dy, Ho, Yb, Ta, W, and Bi, and provide an outlook on their use as high-performance CT contrast agents.
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Affiliation(s)
- Mohammad Yaseen Ahmad
- Department of Chemistry, College of Natural Sciences, Kyungpook National University, Taegu 41566, Republic of Korea; (M.Y.A.); (S.L.); (T.T.); (A.K.A.A.S.); (D.Z.); (Y.L.)
| | - Shuwen Liu
- Department of Chemistry, College of Natural Sciences, Kyungpook National University, Taegu 41566, Republic of Korea; (M.Y.A.); (S.L.); (T.T.); (A.K.A.A.S.); (D.Z.); (Y.L.)
| | - Tirusew Tegafaw
- Department of Chemistry, College of Natural Sciences, Kyungpook National University, Taegu 41566, Republic of Korea; (M.Y.A.); (S.L.); (T.T.); (A.K.A.A.S.); (D.Z.); (Y.L.)
| | - Abdullah Khamis Ali Al Saidi
- Department of Chemistry, College of Natural Sciences, Kyungpook National University, Taegu 41566, Republic of Korea; (M.Y.A.); (S.L.); (T.T.); (A.K.A.A.S.); (D.Z.); (Y.L.)
| | - Dejun Zhao
- Department of Chemistry, College of Natural Sciences, Kyungpook National University, Taegu 41566, Republic of Korea; (M.Y.A.); (S.L.); (T.T.); (A.K.A.A.S.); (D.Z.); (Y.L.)
| | - Ying Liu
- Department of Chemistry, College of Natural Sciences, Kyungpook National University, Taegu 41566, Republic of Korea; (M.Y.A.); (S.L.); (T.T.); (A.K.A.A.S.); (D.Z.); (Y.L.)
| | - Sung-Wook Nam
- Department of Molecular Medicine, School of Medicine, Kyungpook National University, Taegu 41944, Republic of Korea;
| | - Yongmin Chang
- Department of Molecular Medicine, School of Medicine, Kyungpook National University, Taegu 41944, Republic of Korea;
| | - Gang Ho Lee
- Department of Chemistry, College of Natural Sciences, Kyungpook National University, Taegu 41566, Republic of Korea; (M.Y.A.); (S.L.); (T.T.); (A.K.A.A.S.); (D.Z.); (Y.L.)
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Gilys L, Griškonis E, Griškevičius P, Adlienė D. Lead Free Multilayered Polymer Composites for Radiation Shielding. Polymers (Basel) 2022; 14:1696. [PMID: 35566867 PMCID: PMC9104398 DOI: 10.3390/polym14091696] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [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: 03/31/2022] [Revised: 04/15/2022] [Accepted: 04/19/2022] [Indexed: 02/04/2023] Open
Abstract
Silicone-based polymer composites containing high atomic number additives are prioritized for the development of new materials for radiation shielding, due to their mechanical, thermal, electrical, and multifunctional properties. The X-ray attenuation properties, as well as mechanical properties, of the newly developed-lead-free multi-layered structures for radiation shielding, based on silicone composite layers containing tin, cerium oxide, tungsten oxide, and bismuth additives, are analyzed and discussed in this paper. It is shown that, by varying the additive concentrations in silicone composites, lead-free and flexible layered structures, exhibiting lead-equivalent X-ray shielding, can be fabricated.
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Affiliation(s)
- Laurynas Gilys
- Department of Physics, Faculty of Mathematics and Natural Sciences, Kaunas University of Technology, Studentu Street 50, LT-51368 Kaunas, Lithuania;
| | - Egidijus Griškonis
- Department of Physical and Inorganic Chemistry, Faculty of Chemical Technology, Kaunas University of Technology, Radvilenu Street 19, LT-50254 Kaunas, Lithuania;
| | - Paulius Griškevičius
- Department of Mechanical Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, Studentu Street 56, LT-51424 Kaunas, Lithuania;
| | - Diana Adlienė
- Department of Physics, Faculty of Mathematics and Natural Sciences, Kaunas University of Technology, Studentu Street 50, LT-51368 Kaunas, Lithuania;
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Agrawal V, Paulose R, Arya R, Rajak G, Giri A, Bijanu A, Sanghi SK, Mishra D, N P, Khare AK, Parmar V, Khan MA, Bhisikar A, Srivastava AK, Thankaraj Salammal S. Green conversion of hazardous red mud into diagnostic X-ray shielding tiles. J Hazard Mater 2022; 424:127507. [PMID: 34879512 DOI: 10.1016/j.jhazmat.2021.127507] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/30/2021] [Accepted: 10/11/2021] [Indexed: 06/13/2023]
Abstract
Red mud is a solid hazardous alumina industrial waste, which is rich in iron, titanium, aluminum, silicon, calcium, etc. The red mud contains 30-60% of hematite, which is suitable for shielding high energy X- and gamma rays. So, the iron rich red mud was converted into diagnostic X-ray shielding tiles through ceramic route by adding a certain weight percentage of BaSO4 and binders (kaolin clay or sodium hexametaphosphate) with it. The kaolin clay tile possess sufficient impact strength (failure point is 852 mm for 19 mm steel ball) and flexural strength of ~25 N/mm2, which is suitable for wall applications. The 10.3 mm and 14.7 mm thick red mud:BaSO4:kaolin clay tile possess the attenuation equivalent to 2 mm and 2.3 mm lead at 125 kVp and 140 kVp, respectively. No heavy elements were found to leach out except chromium and arsenic from the sintered tiles. However, the leaching of Cr (0.6 ppm) and As (0.015 ppm) was found to be well below the permissible limit. These tiles can be used in the X-ray diagnosis, CT scanner, bone densitometry, and cath labs instead of toxic lead sheet and thereby to protect the operating personnel, public, and environment from radiation hazards.
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Affiliation(s)
- Varsha Agrawal
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Rini Paulose
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India
| | - Rahul Arya
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Gaurav Rajak
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Abhishek Giri
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India
| | - Abhijit Bijanu
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Sunil K Sanghi
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India
| | - Deepti Mishra
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Prasanth N
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India
| | - Anup Kumar Khare
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India
| | - Varsha Parmar
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Mohammed Akram Khan
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Abhay Bhisikar
- Raja Ramanna Centre for Advanced Technology (RRCAT), Indore, India
| | - Avanish Kumar Srivastava
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Shabi Thankaraj Salammal
- CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI), Bhopal, Madhya Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.
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Hashemi SA, Mousavi SM, Faghihi R, Arjmand M, Rahsepar M, Bahrani S, Ramakrishna S, Lai CW. Superior X-ray Radiation Shielding Effectiveness of Biocompatible Polyaniline Reinforced with Hybrid Graphene Oxide-Iron Tungsten Nitride Flakes. Polymers (Basel) 2020; 12:E1407. [PMID: 32585991 PMCID: PMC7361692 DOI: 10.3390/polym12061407] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [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: 05/07/2020] [Revised: 06/19/2020] [Accepted: 06/20/2020] [Indexed: 01/17/2023] Open
Abstract
X-ray radiation is a harmful carcinogenic electromagnetic source that can adversely affect the health of living species and deteriorate the DNA of cells, thus it's vital to protect vulnerable sources from them. To address this flaw, the conductive polymeric structure of polyaniline (PANi) was reinforced with diverse filler loadings (i.e., 25 wt % and 50 wt %) of hybrid graphene oxide-iron tungsten nitride (ITN) flakes toward attenuation of X-ray beams and inhabitation of microorganisms' growth. Primary characterizations confirmed the successful decoration of graphene oxide (GO) with interconnected and highly dense structure of iron tungsten nitride with a density of about 24.21 g.cm⁻3 and reinforcement of PANi with GO-ITN. Additionally, the outcome of evaluations showed the superior performance of developed shields, where a shield with 1.2 mm thickness containing 50 wt % GO-ITN showed 131.73 % increase in the electrical conductivity (compared with neat PANi) along with 78.07%, 57.12%, and 44.99% decrease in the amplitude of the total irradiated X-ray waves at 30, 40, and 60 kVp tube voltages, respectively, compared with control X-ray dosage. More importantly, the developed shields not only showed non-toxic nature and improved the viability of cells, but also completely removed the selected microorganisms at a concentration of 1000 µg.mL-1.
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Affiliation(s)
- Seyyed Alireza Hashemi
- Department of Mechanical Engineering, Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore 119077, Singapore;
- Department of Medical Nanotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz 71348-14336, Iran; (S.M.M.); (S.B.)
| | - Seyyed Mojtaba Mousavi
- Department of Medical Nanotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz 71348-14336, Iran; (S.M.M.); (S.B.)
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Reza Faghihi
- Nuclear Engineering Department, Shiraz University, Shiraz 71936-16548, Iran;
- Radiation Research Center, Shiraz University, Shiraz 71936-16548, Iran
| | - Mohammad Arjmand
- School of Engineering, University of British Columbia, Kelowna, BC V1V 1V7, Canada;
| | - Mansour Rahsepar
- Department of Materials Science and Engineering, School of Engineering, Shiraz University, Zand Boulevard, Shiraz 71348-51154, Iran;
| | - Sonia Bahrani
- Department of Medical Nanotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz 71348-14336, Iran; (S.M.M.); (S.B.)
| | - Seeram Ramakrishna
- Department of Mechanical Engineering, Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore 119077, Singapore;
| | - Chin Wei Lai
- Nanotechnology & Catalysis Research Center, University of Malaya, Kuala Lumpur 50603, Malaysia;
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Nolasco P, Coelho PV, Coelho C, Angelo DF, Dias JR, Alves NM, Maurício A, Pereira MFC, Alves de Matos AP, Martins RC, Carvalho PA. Mineralization of Sialoliths Investigated by Ex Vivo and In Vivo X-ray Computed Tomography. Microsc Microanal 2019; 25:151-163. [PMID: 30714561 DOI: 10.1017/s1431927618016124] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The fraction of organic matter present affects the fragmentation behavior of sialoliths; thus, pretherapeutic information on the degree of mineralization is relevant for a correct selection of lithotripsy procedures. This work proposes a methodology for in vivo characterization of salivary calculi in the pretherapeutic context. Sialoliths were characterized in detail by X-ray computed microtomography (μCT) in combination with atomic emission spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Correlative analysis of the same specimens was performed by in vivo and ex vivo helical computed tomography (HCT) and ex vivo μCT. The mineral matter in the sialoliths consisted essentially of apatite (89 vol%) and whitlockite (11 vol%) with average density of 1.8 g/cm3. In hydrated conditions, the mineral mass prevailed with 53 ± 13 wt%, whereas the organic matter, with a density of 1.2 g/cm3, occupied 65 ± 10% of the sialoliths' volume. A quantitative relation between sialoliths mineral density and X-ray attenuation is proposed for both HCT and μCT.
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Affiliation(s)
- Pedro Nolasco
- CeFEMA, Instituto Superior Técnico, University of Lisbon,Av. Rovisco Pais, 1049-001 Lisboa,Portugal
| | - Paulo V Coelho
- Service of Maxillofacial Surgery,Centro Hospitalar de Lisboa Central,R. José António Serrano 1150-199 Lisboa,Portugal
| | - Carla Coelho
- Service of Maxillofacial Surgery,Centro Hospitalar de Lisboa Central,R. José António Serrano 1150-199 Lisboa,Portugal
| | - David F Angelo
- NMS/FCM-UNL, Nova Medical School--Medical Sciences Faculty, Nova University of Lisbon,Campo Mártires da Pátria, 130, 1169-056 Lisboa,Portugal
| | - J R Dias
- CDRsp, Polytechnic Institute of Leiria,Rua de Portugal, Zona Industrial,2430-028, Marinha Grande,Portugal
| | - Nuno M Alves
- CDRsp, Polytechnic Institute of Leiria,Rua de Portugal, Zona Industrial,2430-028, Marinha Grande,Portugal
| | - António Maurício
- CERENA, Department of Civil Engineering,Architecture and Georessources, Instituto Superior Técnico, University of Lisbon,Av. Rovisco Pais, 1049-001 Lisboa,Portugal
| | - Manuel F C Pereira
- CERENA, Department of Civil Engineering,Architecture and Georessources, Instituto Superior Técnico, University of Lisbon,Av. Rovisco Pais, 1049-001 Lisboa,Portugal
| | | | - Raul C Martins
- IT, Department of Bioengineering,Instituto Superior Técnico, University of Lisbon,Av. Rovisco Pais, 1049-001 Lisboa,Portugal
| | - Patrícia A Carvalho
- CeFEMA, Instituto Superior Técnico, University of Lisbon,Av. Rovisco Pais, 1049-001 Lisboa,Portugal
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Scholz AM, Bünger L, Kongsro J, Baulain U, Mitchell AD. Non-invasive methods for the determination of body and carcass composition in livestock: dual-energy X-ray absorptiometry, computed tomography, magnetic resonance imaging and ultrasound: invited review. Animal 2015; 9:1250-64. [PMID: 25743562 DOI: 10.1017/S1751731115000336] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The ability to accurately measure body or carcass composition is important for
performance testing, grading and finally selection or payment of meat-producing animals.
Advances especially in non-invasive techniques are mainly based on the development of
electronic and computer-driven methods in order to provide objective phenotypic data. The
preference for a specific technique depends on the target animal species or carcass,
combined with technical and practical aspects such as accuracy, reliability, cost,
portability, speed, ease of use, safety and for in vivo measurements the
need for fixation or sedation. The techniques rely on specific device-driven signals,
which interact with tissues in the body or carcass at the atomic or molecular level,
resulting in secondary or attenuated signals detected by the instruments and analyzed
quantitatively. The electromagnetic signal produced by the instrument may originate from
mechanical energy such as sound waves (ultrasound – US), ‘photon’ radiation
(X-ray-computed tomography – CT, dual-energy X-ray absorptiometry – DXA) or radio
frequency waves (magnetic resonance imaging – MRI). The signals detected by the
corresponding instruments are processed to measure, for example, tissue depths, areas,
volumes or distributions of fat, muscle (water, protein) and partly bone or bone mineral.
Among the above techniques, CT is the most accurate one followed by MRI and DXA, whereas
US can be used for all sizes of farm animal species even under field conditions. CT, MRI
and US can provide volume data, whereas only DXA delivers immediate whole-body composition
results without (2D) image manipulation. A combination of simple US and more expensive CT,
MRI or DXA might be applied for farm animal selection programs in a stepwise approach.
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Noor Azman NZ, Siddiqui SA, Haroosh HJ, Albetran HMM, Johannessen B, Dong Y, Low IM. Characteristics of X-ray attenuation in electrospun bismuth oxide/polylactic acid nanofibre mats. J Synchrotron Radiat 2013; 20:741-748. [PMID: 23955038 DOI: 10.1107/s0909049513017871] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 06/28/2013] [Indexed: 06/02/2023]
Abstract
The characteristics of the X-ray attenuation in electrospun nano(n)- and micro(m)-Bi2O3/polylactic acid (PLA) nanofibre mats with different Bi2O3 loadings were compared as a function of energy using mammography (i.e. tube voltages of 22-49 kV) and X-ray absorption spectroscopy (XAS) (7-20 keV). Results indicate that X-ray attenuation by electrospun n-Bi2O3/PLA nanofibre mats is distinctly higher than that of m-Bi2O3/PLA nanofibre mats at all energies investigated. In addition, with increasing filler loading (n-Bi2O3 or m-Bi2O3), the porosity of the nanofibre mats decreased, thus increasing the X-ray attenuation, except for the sample containing 38 wt% Bi2O3 (the highest loading in the present study). The latter showed higher porosity, with some beads formed, thus resulting in a sudden decrease in the X-ray attenuation.
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Affiliation(s)
- Nurul Z Noor Azman
- Department of Imaging and Applied Physics, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
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