Special Session AMMD 2009 Abstracts


Full Papers
Paper Nr: 9
Title:

COLLIMATION OF X-RAY DIAGNOSTIC BUNDLE BY MEANS OF STEERING FERROFLUID

Authors:

Andrzej Dyszkiewicz, Bartłomiej Pawlus, Damian Chachulski, Jakub Zajdel, Paweł Kpiński and Paweł Połeć

Abstract: The study addressed the problem of the incoherence of an X-ray tube generated bundle. In spite of the large progress made in the area of the durability and efficiency of these devices, the problem of the inherent divergence of the bundle hasnt yet been resolved in a satisfying way. In the face of difficulties with concentrating X-rays, the only practical way of eliminating non-axial rays is by applying lead collimators of a suitable length and diameter as well as mechanical systems of movable distracting grids. An entirely new approach has been the use of electro-magnetorheological fluids as filters, which are capable of modifying their physical and quantum properties contingently based on the parameters of the applied external electric current, centrifugal force and magnetic field. The experiments carried out showed, that the described changes also concern the absorbtion, distraction or change in the direction of the X-ray beam. In the constructed prototype device, interesting and recurrent results in the modification or eleimination of non-axial rays were obtained, which resulted in the improvement of the quality of bone images. The following research questions were posed: (1) are changes in the photodensitometric parameters of joint (PIP) X-ray images containing soft and osseous tissues proof of alterations of the physical parameters of a diagnostic X-ray beam? (2) is there a relationship between the volume of ferrofluid in a lens and its capability to alter the parameters of a permeating X-ray beam? (3) is there a relationship between the r.p.m. of the collimator and its capability to alter the parameters of a permeating X-ray beam, and does it have a linear character? Based on the conducted research a non-linear dependancy was observed between the volume of ferrofluid in the lens as well as its rotational speed and the capability of the system to alter the parameters of the permeating X-ray beam.

Paper Nr: 11
Title:

NOVEL COMBINED TEMPLATE FOR AMPEROMETRIC BIOSENSORS WITH CHANGEABLE SELECTIVITY

Authors:

Arunas Setkus, Julija Razumiene, Jurgis Barkauskas, Vidute Gureviciene and Virginijus Bukauskas

Abstract: Present paper describes innovative approach in design of amperometric biosensors useful in various appli-cations. Original template of the electrodes has been prepared on a base of carbon nanotube support layer deposited on the polycarbonate membrane. Novel template and changeable enzyme layer give rise to creation of new family of biosensors acceptable for detection of wide range of carbohydrates. The morphology and electric properties of the constituent parts of the template electrode are characterized by scanning probe microscopy. The sensitivity, selectivity and stability are described for typical types of the biosensors.

Paper Nr: 13
Title:

MODELLING AND TRIALS OF PYROELECTRIC SENSORS FOR IMPROVING ITS APPLICATION FOR BIODEVICES

Authors:

Andrés Díaz Lantada, Héctor Lorenzo-Yustos, Héctor Hugo del Olmo, Javier Echavarri Otero, José Luis Muñoz Sanz, Juan Manuel Munoz-Guijosa, Julio Muñoz-García and Pilar Lafont Morgado

Abstract: Active or “Intelligent” Materials are capable of responding in a controlled way to different external physical or chemical stimuli by changing some of their properties. These materials can be used to design and develop sensors, actuators and multifunctional systems with a large number of applications for developing medical devices. Pyroelectric materials, with thermoelectrical properties coupling, can be used as temperature sensors with applications in the development of several biodevices, including the combination with other thermally active materials, whose actuation can be improved by means of precise temperature registration. This paper makes an introduction to pyroelectricity and its main applications in the development of biodevices, focusing also in the pyroelectric properties of polyvinylidene fluoride or PVDF and presenting some results related with sensors’ behaviour modelling and characterization.

Paper Nr: 14
Title:

POLYMERIC FILM SENSORS BASED ON PAH-PAZO IONIC SELF-ASSEMBLED MULTI-NANOLAYERS

Authors:

Beatriz Borges, Celso Ribeiro, Hugo Águas, Maria Raposo, Paulo A. Ribeiro, Paulo J. Gomes, Pedro Santos and Pedro Brogueira

Abstract: A sensor platform composed by interdigitated electrodes covered by a tailored nanofilm of 5 bilayers of PAH and PAZO polyelectrolytes was successfully built and tested in NaCl solution at relative low concentrations (10-5-10-6 M). The effect of temperature on the electrical measurements was addressed and indicated its importance for to sake accuracy reduction in about one order of magnitude. The film morphology was studied by using ellipsometry and atomic force microscopy techniques. The first inferred precise and consistent values for the film thickness about 50 nm. With respect to the second, relative low values of the surface roughness of about few nanometers were measured and also micrometer diameter agglomerates and channels with a bilayer size depth were identified.

Posters
Paper Nr: 7
Title:

CHARACTERISATION AND MEDICAL APPLICATIONS OF MAGNETORHEOLOGICAL FLUIDS

Authors:

Andrés Díaz Lantada, Héctor Lorenzo-Yustos, Javier Echavarri Otero, José Luis Muñoz Sanz, Juan Manuel Munoz-Guijosa, Julio Muñoz-García and Pilar Lafont Morgado

Abstract: Magnetorheological fluids are composed by magnetic particles suspended within a carrier fluid which allow to change their rheology when subjected to a magnetic field. This property can be controlled very accurately by varying the magnetic field intensity which provides a rapid and effective system to control the response of very diverse fluid-mechanical devices.The characterisation of two new magnethoreological fluids is presented. The force response when the magnetic field varies is studied in static and dynamic conditions.This paper sets out some of the opportunities and advantages provided by this fluids both for medical and non-medical applications.