Related Research Articles
A gel is a semi-solid that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady-state, although the liquid phase may still diffuse through this system. A gel has been defined phenomenologically as a soft, solid or solid-like material consisting of two or more components, one of which is a liquid, present in substantial quantity.
Medical physics deals with the application of the concepts and methods of physics to the prevention, diagnosis and treatment of human diseases with a specific goal of improving human health and well-being. Since 2008, medical physics has been included as a health profession according to International Standard Classification of Occupation of the International Labour Organization.
The gray is the unit of ionizing radiation dose in the International System of Units (SI), defined as the absorption of one joule of radiation energy per kilogram of matter.
Radiation dosimetry in the fields of health physics and radiation protection is the measurement, calculation and assessment of the ionizing radiation dose absorbed by an object, usually the human body. This applies both internally, due to ingested or inhaled radioactive substances, or externally due to irradiation by sources of radiation.
Sir Peter Mansfield was an English physicist who was awarded the 2003 Nobel Prize in Physiology or Medicine, shared with Paul Lauterbur, for discoveries concerning Magnetic Resonance Imaging (MRI). Mansfield was a professor at the University of Nottingham.
Soft matter or soft condensed matter is a subfield of condensed matter comprising a variety of physical systems that are deformed or structurally altered by thermal or mechanical stress of the magnitude of thermal fluctuations. These materials share an important common feature in that predominant physical behaviors occur at an energy scale comparable with room temperature thermal energy, and that entropy is considered the dominant factor. At these temperatures, quantum aspects are generally unimportant. Soft materials include liquids, colloids, polymers, foams, gels, granular materials, liquid crystals, flesh, and a number of biomaterials. Pierre-Gilles de Gennes, who has been called the "founding father of soft matter," received the Nobel Prize in Physics in 1991 for discovering that methods developed for studying order phenomena in simple systems can be generalized to the more complex cases found in soft matter, in particular, to the behaviors of liquid crystals and polymers.
A hydrogel is a biphasic material, a mixture of porous, permeable solids and at least 10% by weight or volume of interstitial fluid composed completely or mainly by water. In hydrogels the porous permeable solid is a water insoluble three dimensional network of natural or synthetic polymers and a fluid, having absorbed a large amount of water or biological fluids. These properties underpin several applications, especially in the biomedical area. Many hydrogels are synthetic, but some are derived from nature. The term 'hydrogel' was coined in 1894.
The ionization chamber is the simplest type of gaseous ionisation detector, and is widely used for the detection and measurement of many types of ionizing radiation, including X-rays, gamma rays, and beta particles. Conventionally, the term "ionization chamber" refers exclusively to those detectors which collect all the charges created by direct ionization within the gas through the application of an electric field. It uses the discrete charges created by each interaction between the incident radiation and the gas to produce an output in the form of a small direct current. This means individual ionising events cannot be measured, so the energy of different types of radiation radiation cannot be differentiated, but it gives a very good measurement of overall ionising effect.
In polymer chemistry, gelation is the formation of a gel from a system with polymers. Branched polymers can form links between the chains, which lead to progressively larger polymers. As the linking continues, larger branched polymers are obtained and at a certain extent of the reaction links between the polymer result in the formation of a single macroscopic molecule. At that point in the reaction, which is defined as gel point, the system loses fluidity and viscosity becomes very large. The onset of gelation, or gel point, is accompanied by a sudden increase in viscosity. This "infinite" sized polymer is called the gel or network, which does not dissolve in the solvent, but can swell in it.
The computed tomography dose index (CTDI) is a commonly used radiation exposure index in X-ray computed tomography (CT), first defined in 1981. The unit of CTDI is the gray (Gy) and it can be used in conjunction with patient size to estimate the absorbed dose. The CTDI and absorbed dose may differ by more than a factor of two for small patients such as children.
Gel dosimeters, also called Fricke gel dosimeters, are manufactured from radiation sensitive chemicals that, upon irradiation with ionising radiation, undergo a fundamental change in their properties as a function of the absorbed radiation dose.
Nanocomposite hydrogels are nanomaterial-filled, hydrated, polymeric networks that exhibit higher elasticity and strength relative to traditionally made hydrogels. A range of natural and synthetic polymers are used to design nanocomposite network. By controlling the interactions between nanoparticles and polymer chains, a range of physical, chemical, and biological properties can be engineered. The combination of organic (polymer) and inorganic (clay) structure gives these hydrogels improved physical, chemical, electrical, biological, and swelling/de-swelling properties that cannot be achieved by either material alone. Inspired by flexible biological tissues, researchers incorporate carbon-based, polymeric, ceramic and/or metallic nanomaterials to give these hydrogels superior characteristics like optical properties and stimulus-sensitivity which can potentially be very helpful to medical and mechanical fields.
Phantom structures are artificial structures designed to emulate properties of the human body in matters such as, including, but not limited to, light scattering and optics, electrical conductivity, and sound wave reception. Phantoms have been used experimentally in lieu of, or as a supplement to, human subjects to maintain consistency, verify reliability of technologies, or reduce experimental expense. They also have been employed as material for training technicians to perform imaging.
Aline Fiona Miller is a Professor of Biomolecular Engineering at the University of Manchester. She specialises in the characterisation of polymer, biopolymer and peptides, using neutron and x-ray scattering, as well as the development of functionalised nanostructures for regenerative medicine and toxicology testing.
Katherine Whittaker Ferrara is an American engineer who is a professor of radiology at Stanford University. Ferrara has been elected a Fellow of the American Association for the Advancement of Science, Institute of Electrical and Electronics Engineers and American Institute for Medical and Biological Engineering.
Katarina Svanberg is a Swedish physician who is Professor and Chief Consultant of Oncology at the Skåne University Hospital. Her research considers the use of fluorescence-based tumour imaging and photodynamic therapy. She served as President of SPIE in 2011 and was awarded the SPIE Gold Medal in 2017.
Surita Bhatia is an American chemist who is Professor and Vice Provost of Faculty Affairs at Stony Brook University. Her work considers the structure of soft materials, including polymeric hydrogels and colloidal glasses. She was elected Fellow of the American Institute of Chemical Engineers, the American Institute for Medical and Biological Engineering and the Society of Rheology in 2020.
Liliane Léger née Quercy is a French physicist. Her research considers polymers and the molecular mechanisms of adhesion. She was awarded the Groupe Français d’Études et d’Applications des Polymères Prix d’Honneur in 2021.
Philippe B. Wilson is a Franco-British healthcare scientist who is Professor of One Health at Nottingham Trent University. Since 2021, he has served as Chief Scientific Officer of NHS Willows Health. His research considers the development of tools and technologies for translational medicine with applications to human, environmental and animal health.
Tatiana Segura is an American biomedical engineer who is a professor at Duke University. Her research considers biomedical engineering solutions to promote cell growth. She was elected Fellow of the American Institute for Medical and Biological Engineering in 2017 and awarded the Acta Biomaterialia Silver Medal in 2021.
References
- 1 2 3 "Staff Listing - The University of Nottingham". www.nottingham.ac.uk. Retrieved 15 May 2022.
- ↑ Mather, Melissa Louise (2003). Ultrasound evaluation of radiation sensitive polymer gels (Thesis). OCLC 225209630.
- ↑ "New ASTM Standard Guide Characterizes Hydrogels in Regenerative Medicine | NEWSROOM". newsroom.astm.org. Retrieved 15 May 2022.
- 1 2 "Organic medical imaging system to detect disease and track medication - The University of Nottingham". www.nottingham.ac.uk. Retrieved 15 May 2022.
- ↑ Translate, Istm (17 August 2015). "ISTM Translate: Melissa Mather - ISTM's New Professor of Biomedical Imaging". ISTM Translate. Retrieved 15 May 2022.
- ↑ University, Keele. "2017, Keele University". Keele University. Retrieved 15 May 2022.
- ↑ Radu, Valentin; Price, Joshua Colm; Levett, Simon James; Narayanasamy, Kaarjel Kauslya; Bateman-Price, Thomas David; Wilson, Philippe Barrie; Mather, Melissa Louise (27 March 2020). "Dynamic Quantum Sensing of Paramagnetic Species Using Nitrogen-Vacancy Centers in Diamond". ACS Sensors. 5 (3): 703–710. doi:10.1021/acssensors.9b01903. ISSN 2379-3694. PMC 7106109 . PMID 31867948.
| General | |
|---|---|
| Scientific databases | |
| Other | |
