Acousto-Optic Catheter Tracking Sensor for Interventional MRI Procedures

Yaras, Yusuf Samet; Satır, Sarp; Özsoy, Çağla; Ramasawmy, Rajiv; Campbell-Washburn, Adrienne E; Lederman, Robert J.; Kocatürk, Özgür; Degertekin, F. Levent

doi:10.1109/tbme.2018.2868830

Cited by 14 publications

(16 citation statements)

References 37 publications

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“…Electromagnetic field interference during MRI makes sensing in that environment challenging, thus fiber optic based sensors are well suited for MRI applications due to intrinsic immunity to electromagnetic field. Along these lines, we recently introduced a FBG based acousto-optic catheter tracking sensor for interventional MRI procedures [27,28]. Since image formation in MRI is achieved by frequency and phase encoding, the linearity of the FBGs is very crucial in such applications, especially phase.…”

Section: (B)mentioning

confidence: 99%

“…The strain field on the FBG was generated using a custom lithium niobate (LiNbO3) piezoelectric transducer (Boston Piezo-Optics) with 23MHz thickness mode resonance. The transducer was used in a configuration for MRI position tracking as described earlier [27,28]. To record the sensitivity variation, the bias point on the side slope was slowly changed from minimum reflection to maximum reflection while using a continuous wave acoustic excitation.…”

Section: Linearity Analysismentioning

confidence: 99%

“…The impact of phase nonlinearity of FBG sensor for position tracking during real-time MRI is observed when the bias point is changed due to finite response time of the wavelength controller [27,28]. Since π-FBG-2 has higher nonlinearity, to demonstrate and test a phase nonlinearity correction method, the π-FBG-2 based sensor was tested under MRI.…”

Section: Demonstration Of Fbg Phase Correction For Position Tracking mentioning

confidence: 99%

“…The sensor was tested under a 0.55T prototype MRI system using the experimental set-up shown in Fig. 9 and detailed description of the overall system can be found in [27]. A 30 AWG insulated copper wire wound into a tight-pitched solenoid coil with 2.4 mm diameter and 8 turns was used as an active MRI marker.…”

Section: Demonstration Of Fbg Phase Correction For Position Tracking mentioning

confidence: 99%

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Sensitivity and phase response of FBG based acousto-optic sensors for real-time MRI applications

et al. 2020

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Fiber Bragg grating (FBG) based sensors have recently been introduced to the field of magnetic resonance imaging (MRI). Real-time MRI applications demand highly amplitude and phase sensitive MRI compatible sensors. Thus, a model and detailed analysis of FBG based ultrasound detection are required for designing better performing sensors. A hybrid FBG model incorporating numerical and FEA methods was developed and used for sensitivity and linearity analysis. The transfer matrix method was used for the modeling of optical modulation whereas FEA was used for pressure field calculations within the grating. The model was verified through reflection spectrum and acoustic pressure sensitivity testing of two π-phase shifted FBGs in a side slope read-out configuration. The sensitivity curves with respect to the operation point on the side slope was characterized in terms of amplitude and phase, and nonlinearity of the phase response has been quantified. Lastly, the impact of phase linearity of the FBG based acousto-optic sensor was tested under MRI when the sensor was used as a position marker and an analog phase shifter based solution was demonstrated.

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Section: (B)mentioning

confidence: 99%

Section: Linearity Analysismentioning

confidence: 99%

Section: Demonstration Of Fbg Phase Correction For Position Tracking mentioning

confidence: 99%

Section: Demonstration Of Fbg Phase Correction For Position Tracking mentioning

confidence: 99%

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Sensitivity and phase response of FBG based acousto-optic sensors for real-time MRI applications

et al. 2020

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“…An alternative solution to reduce RF-induced heating on active markers and associated transmission lines is using an optical fiber with an optical modulator that does not require external power. 43,44 The acousto-optic sensor structure was described and its potential for position visualization capability was demonstrated in a phantom experiment under a 1.5T MRI scanner, however, the images suffered from low SNR requiring longer imaging sequences and averaging. In a follow-up study, sensitivity improvement was reported as well as a phase correction scheme due to nonlinearity of the high sensitivity sensor.…”

Section: Introductionmentioning

confidence: 99%

Real‐time device tracking under MRI using an acousto‐optic active marker

Yaras

Yildirim

Herzka

et al. 2020

Magnetic Resonance in Med

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This work aims to demonstrate the use of an "active" acousto-optic marker with enhanced visibility and reduced radiofrequency (RF)-induced heating for interventional MRI. Methods: The acousto-optic marker was fabricated using bulk piezoelectric crystal and π-phase shifted fiber Bragg grating (FBGs) and coupled to a distal receiver coil on an 8F catheter. The received MR signal is transmitted over an optical fiber to mitigate RF-induced heating. A photodetector converts the optical signal into electrical signal, which is used as the input signal to the MRI receiver plug. Acousto-optic markers were characterized in phantom studies. RF-induced heating risk was evaluated according to ASTM 2182 standard. In vivo real-time tracking capability was tested in an animal model under a 0.55T scanner. Results: Signal-to-noise ratio (SNR) levels suitable for real-time tracking were obtained by using high sensitivity FBG and piezoelectric transducer with resonance matched to Larmor frequency. Single and multiple marker coils integrated to 8F catheters were readout for position and orientation tracking by a single acousto-optic sensor. RF-induced heating was significantly reduced compared to a coax cable connected reference marker. Real-time distal tip tracking of an active device was demonstrated in an animal model with a standard real-time cardiac MR sequence. Conclusion: Acousto-optic markers provide sufficient SNR with a simple structure for real-time device tracking. RF-induced heating is significantly reduced compared to conventional active markers. Also, multiple RF receiver coils connected on an acousto-optic modulator can be used on a single catheter for determining catheter orientation and shape.

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A Review of Recent Advancements in Sensor‐Integrated Medical Tools

Park,

Seo,

Jeong

et al. 2024

Advanced Science

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A medical tool is a general instrument intended for use in the prevention, diagnosis, and treatment of diseases in humans or other animals. Nowadays, sensors are widely employed in medical tools to analyze or quantify disease‐related parameters for the diagnosis and monitoring of patients’ diseases. Recent explosive advancements in sensor technologies have extended the integration and application of sensors in medical tools by providing more versatile in vivo sensing capabilities. These unique sensing capabilities, especially for medical tools for surgery or medical treatment, are getting more attention owing to the rapid growth of minimally invasive surgery. In this review, recent advancements in sensor‐integrated medical tools are presented, and their necessity, use, and examples are comprehensively introduced. Specifically, medical tools often utilized for medical surgery or treatment, for example, medical needles, catheters, robotic surgery, sutures, endoscopes, and tubes, are covered, and in‐depth discussions about the working mechanism used for each sensor‐integrated medical tool are provided.

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Acousto-Optic Catheter Tracking Sensor for Interventional MRI Procedures

Abstract: Acousto-optics provides a compact solution to sense RF signals in MRI with dielectric transmission lines.

Cited by 14 publications

References 37 publications

Sensitivity and phase response of FBG based acousto-optic sensors for real-time MRI applications

Sensitivity and phase response of FBG based acousto-optic sensors for real-time MRI applications

Real‐time device tracking under MRI using an acousto‐optic active marker

A Review of Recent Advancements in Sensor‐Integrated Medical Tools

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