Abstract
In this work, we discuss the idea and practical implementation of an integrated photonic circuit-based interrogator of fiber Bragg grating (FBG) sensors dedicated to monitoring the condition of the patients exposed to Magnetic Resonance Imaging (MRI) diagnosis. The presented solution is based on an Arrayed Waveguide Grating (AWG) demultiplexer fabricated in generic indium phosphide technology. We demonstrate the consecutive steps of development of the device from design to demonstrator version of the system with confirmed functionality of monitoring the respiratory rate of the patient. The results, compared to those obtained using commercially available bulk interrogator, confirmed both the general concept and proper operation of the device.
Highlights
In contemporary medicine, there is an obvious, clearly visible trend in the continuous improvement of the quality of medical care by introducing various advanced technologybased diagnostic, monitoring, and life-support systems, which may improve the quality and efficiency of diagnosis, therapy, and patient care
We present the progress in developing the interrogating part of the system, the core of which is realized as an application specific photonic integrated circuit (ASPIC)
We have presented the compact optoelectronic system for monitoring fundamental vital signs of the patient under Magnetic Resonance Imaging (MRI) scan, based on fiber Bragg grating (FBG) sensors and photonic integrated circuit as an interrogating device, with so-far demonstrated functionality of the proper detection of the respiratory rate, while the work on heart rate detection is still in progress
Summary
There is an obvious, clearly visible trend in the continuous improvement of the quality of medical care by introducing various advanced technologybased diagnostic, monitoring, and life-support systems, which may improve the quality and efficiency of diagnosis, therapy, and patient care. The FBG sensors and optical fibers by their nature are insensitive to the magnetic field, so they can be installed inside an MRI chamber, while the entire interrogator system and computer for data analysis can be located outside, in the MRI operator room Designed in such a way, the system is invisible to a patient (the measurements do not require direct contact with the patient’s body), and does not reduce his/her psychical comfort. To miniaturize the system shown, a single photonic integrated circuit (PIC) was designed equipped with an arrayed waveguide grating (AWG) demultiplexer with outputs connected to multiple PIN photodiodes. To miniaturize the system shown, a single photonic integrated circ (PIC) was designed equipped with an arrayed waveguide grating (AWG) demultiple with outputs connected to multiple PIN photodiodes. EBqoutiphBpodethdesdwiegistnihgentdwedoiniontpetterircrraoolggianatptoourrstsss,hsuahsriaenrgtehaetnhsgaelmedseawgmeaneveegrgaeulnildaeeyrsoa.ulOtlusactyhooefmutwte.soEcihancephmuotsef .tthhEeeamocnhies of them equipispdeirdecwtlyitchoutwpleodotpo ttihceaAl WinGpuantsd, tuhseiontghearnognleeids cwonanveecgteudivdieasa. bOuuiltdoinf stwemoicionnpduutcs- the on directtolryocpotiucapllaemdptolifitehre(SAOWA)Gtoainndcretahsee oththe eprowonereliesvecloonfntehcetiendpuvtiasiganbalu. iTldheinoustepmuticonduc opticwaalvaemgupidliefsieorf (tShOe AAW) tGoairneccroenanseecttehdetpooawn earrraleyvoeflPoIfNthpehoitnopduiotdseisg. nTahle. lTahyoeuot uistput wa guidctehosemobpfoatttthiobemleA,wtWhitehGtoapaCraOenRdcDotOhneNnreiggcethnetedsriidctoepaoacfnkthaagerircnahgyipsco,hafenPmdIeNo,phtpaicvhaionl gitnotpdhueitoesdl/eoecutsr.tipcTauhltsienatlteartyfhaoecueletafttis comp ble wsiidthe (aseCe FOigRuDreO3)N. generic packaging scheme, having the electrical interface at the b tom, the top and the right side of the chip, and optical inputs/outputs at the left side ( Figu3r.eI3n)te. rrogator Validation
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