IEEE J Biomed Health Inform - Experimental Evaluation of an Invasive Medical Instrument Based on a Displacement Measurement System.

Tópicos

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Resumo

This paper presents a novel method for tracking the position of a medical instrument's tip. The system is based on phase locking a high frequency signal transmitted from the medical instrument's tip to a reference signal. Displacement measurement is established having the loop open, in order to get a low frequency voltage representing the medical instrument's movement; therefore, positioning is established by means of conventional measuring techniques. The voltage-controlled oscillator stage of the phase-locked loop (PLL), combined to an appropriate antenna, comprises the associated transmitter located inside the medical instrument tip. All the other low frequency PLL components, low noise amplifier and mixer, are located outside the human body, forming the receiver part of the system. The operating details of the proposed system were coded in Verilog-AMS. Simulation results indicate robust medical instrument tracking in 1-D. Experimental evaluation of the proposed position tracking system is also presented. The experiments described in this paper are based on a transmitter moving opposite a stationary receiver performing either constant velocity or uniformly accelerated movement, and also together with two stationary receivers performing constant velocity movement again. This latter setup is implemented in order to demonstrate the prototype's accuracy for planar (2-D) motion measurements. Error analysis and time-domain analysis are presented for system performance characterization. Furthermore, preliminary experimental assessment using a saline solution container to more closely approximate the human body as a radio frequency wave transmission medium has proved the system's capability of operating underneath the skin.

Resumo Limpo

paper present novel method track posit medic instrument tip system base phase lock high frequenc signal transmit medic instrument tip refer signal displac measur establish loop open order get low frequenc voltag repres medic instrument movement therefor posit establish mean convent measur techniqu voltagecontrol oscil stage phaselock loop pll combin appropri antenna compris associ transmitt locat insid medic instrument tip low frequenc pll compon low nois amplifi mixer locat outsid human bodi form receiv part system oper detail propos system code verilogam simul result indic robust medic instrument track d experiment evalu propos posit track system also present experi describ paper base transmitt move opposit stationari receiv perform either constant veloc uniform acceler movement also togeth two stationari receiv perform constant veloc movement latter setup implement order demonstr prototyp accuraci planar d motion measur error analysi timedomain analysi present system perform character furthermor preliminari experiment assess use salin solut contain close approxim human bodi radio frequenc wave transmiss medium prove system capabl oper underneath skin

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