Document Detail


Experimental evaluation of an invasive medical instrument based on a displacement measurement system.
MedLine Citation:
PMID:  25265618     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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 (VCO) stage of the Phase Locked Loop (PLL), combined to an appropriate antenna comprise the associated transmitter located inside the medical instrument tip. All the other low frequency PLL components, Low Noise Amplifier (LNA) 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 one dimension (1D). 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 (2D) 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 an RF wave transmission medium has proved the system's capability of operating underneath the skin.
Authors:
Dimitris Fotiadis; Alexandros Astaras; Panagiotis Bamidis; Kostas Papathanasiou; Anestis Kalfas
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-9-24
Journal Detail:
Title:  IEEE journal of biomedical and health informatics     Volume:  -     ISSN:  2168-2208     ISO Abbreviation:  IEEE J Biomed Health Inform     Publication Date:  2014 Sep 
Date Detail:
Created Date:  2014-9-29     Completed Date:  -     Revised Date:  2014-9-30    
Medline Journal Info:
Nlm Unique ID:  101604520     Medline TA:  IEEE J Biomed Health Inform     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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