ABSTRACT
A microwave antenna system for transcatheter ablation of cardiac tissue is investigated. A numerical model based on the finite-difference time-domain method incorporating a Gaussian pulse excitation has been constructed and frequency domain electric and magnetic fields are obtained through Fourier transformation. Results are presented for a coaxial line fed monopole catheter which is modified by the successive inclusion of a Teflon sheath outer coating, a terminating disk at the tip of the antenna, a sleeve choke, and a high dielectric constant cylinder surrounding the monopole antenna. The effects of these design features are characterized in terms of specific absorption rate (SAR) and return loss (RL). Numerical calculations are confirmed by comparing with the RL measurement of a Teflon-coated monopole containing a disk and choke.
Subject(s)
Catheter Ablation/instrumentation , Microwaves/therapeutic use , Animals , Arrhythmias, Cardiac/surgery , Biocompatible Materials , Electric Impedance , Electrodes , Equipment Design , Fourier Analysis , Humans , Materials Testing , Models, Biological , Polytetrafluoroethylene , TemperatureABSTRACT
The Millon Clinical Multiaxial Inventory is a 175-item psychodiagnostic instrument which is based on Millon's theory of psychopathology, in which Millon suggests clinical symptoms result from an exacerbation of an individual's personality style when under stress. The purpose of the present study was to examine the relations of personality disorders to clinical symptoms as measured by the inventory. The sample of 245 inpatients from a state psychiatric hospital completed the Millon inventory between January, 1987 and April, 1989. Stepwise multiple-regression analyses were conducted to ascertain the relationship between personality disorders and symptoms. The 9 clinical symptom scales served as criterion variables while the personality-disorder scales served as predictor variables. The results were generally consistent with expectation and are discussed in terms of Millon's theory.
Subject(s)
Hospitalization , Mental Disorders/diagnosis , Personality Disorders/diagnosis , Personality Inventory/statistics & numerical data , Adult , Diagnosis, Differential , Female , Humans , Male , Mental Disorders/classification , Mental Disorders/psychology , Middle Aged , Personality Disorders/classification , Personality Disorders/psychology , PsychometricsABSTRACT
Many counselors are currently undergoing a Kuhnian paradigm shift from linear models of behavioral problem conceptualization to systemic conceptual models. As a result, it has become incumbent on counselor-educators to introduce the systems concept of family therapy to their students within a framework that renders it meaningful not only intellectually but also practically. This paper presents one way of doing this successfully with master's level counselors-in-training who have no live families on which to practice. An overview of systems approaches to family therapy is presented along with a seven-stage supervision approach for teaching structural/strategic therapy in limited situations where the supervision of live families is not practical or possible.
