Biomedical subjects
Publications and source records attributed to D Andreuccetti.
This paper describes a compact, low-profile patch radiator which is the base element for efficient, small-size applicators suitable for superficial hyperthermia. The design criteria and the technological processes involved are presented. The electromagnetic characteristics of the patch element are outlined, and possible application of the radiator are discussed.
Results are presented of an investigation on electric and magnetic fields leaking from inductive (magnetic) heaters that are used for thermal processing of high-power electron tubes and lasers in an industrial plant. Measurements of electric and magnetic fields were done using both commercially available and laboratory-developed instrumentation. Isotropic H-field sensors were developed to allow quantitative evaluation of high-intensity magnetic fields. Ten induction heaters with nominal A.C. power ranging from 2.5 kW to 15 kW and operating at frequencies between 300 kHz and 790 kHz were surveyed. Electric field strengths up to 8 kV/m and magnetic field strengths up to 20 A/m were measured.
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Inadequacy of cardiac output in the ventricular paced complete heart block is generally related to lack of rate adaptation to varying atrial contribution. The status of the art in leads technology had not yet freed the clinicians from the necessity to use a double lead system (atrial and ventricular) in order to maintain the atrial synchronization. Authors present a new simple catheter with double electrode (atrial receptor and ventricular stimulator) which, connecting to a new conceived VAT generator, let to obtain atrial synchronization with a single catheter-electrode implantation. External units were tried in 22 patients who needed temporary treatment. The results appear to be positive in all cases and encourage the Authors to continue with the task undertaken until the system is made implantable.
A method for the determination of the SAR distribution produced by an electromagnetic applicator for localized hyperthermia is described. The procedure for SAR evaluation consists of recording the time evolution of the temperature inside a polyacrylamide phantom by means of thermochromic liquid crystal sheets inserted in it. The technique allows a complete characterization of applicators in a very broad frequency range, using power levels of the order of those needed in real treatments. Criteria for the minimum phantom size and the maximum time duration of the characterization procedure are indicated, which allow a reliable determination of the effective field size and penetration depth of the applicator.