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Robert J Lederman - One of the best experts on this subject based on the ideXlab platform.

  • real time device tracking under mri using an acousto optic active marker
    Magnetic Resonance in Medicine, 2021
    Co-Authors: Yusuf Samet Yaras, Dursun Korel Yildirim, Daniel A Herzka, Toby Rogers, Adrienne E Campbellwashburn, Robert J Lederman, Levent F Degertekin, Ozgur Kocaturk
    Abstract:

    Purpose 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.

  • a cardiovascular magnetic resonance cmr safe metal braided catheter design for interventional cmr at 1 5 t freedom from radiofrequency Induced Heating and preserved mechanical performance
    Journal of Cardiovascular Magnetic Resonance, 2019
    Co-Authors: Korel D Yildirim, Daniel A Herzka, Adrienne E Campbellwashburn, Ozgur Kocaturk, Burcu Basar, Robert J Lederman
    Abstract:

    Background Catheter designs incorporating metallic braiding have high torque control and kink resistance compared with unbraided alternatives. However, metallic segments longer than a quarter wavelength (~ 12 cm for 1.5 T scanner) are prone to radiofrequency (RF) Induced Heating during cardiovascular magnetic resonance (CMR) catheterization. We designed a braid-reinforced catheter with interrupted metallic segments to mitigate RF-Induced Heating yet retain expected mechanical properties for CMR catheterization.

  • a cardiovascular magnetic resonance cmr safe metal braided catheter design for interventional cmr at 1 5 t freedom from radiofrequency Induced Heating and preserved mechanical performance
    Journal of Cardiovascular Magnetic Resonance, 2019
    Co-Authors: Korel D Yildirim, Daniel A Herzka, Adrienne E Campbellwashburn, Ozgur Kocaturk, Burcu Basar, Robert J Lederman
    Abstract:

    Catheter designs incorporating metallic braiding have high torque control and kink resistance compared with unbraided alternatives. However, metallic segments longer than a quarter wavelength (~ 12 cm for 1.5 T scanner) are prone to radiofrequency (RF) Induced Heating during cardiovascular magnetic resonance (CMR) catheterization. We designed a braid-reinforced catheter with interrupted metallic segments to mitigate RF-Induced Heating yet retain expected mechanical properties for CMR catheterization. We constructed metal wire braided 6 Fr catheter shaft subassemblies using electrically insulated stainless-steel wires and off-the-shelf biocompatible polymers. The braiding was segmented, in-situ, using lasers to create non-resonant wire lengths. We compared the Heating and mechanical performance of segmented- with un-segmented- metal braided catheter shaft subassemblies. The braiding segmentation procedure did not significantly alter the structural integrity of catheter subassemblies, torque response, push-ability, or kink resistance compared with non-segmented controls. Segmentation shortened the electrical length of individually insulated metallic braids, and therefore inhibited resonance during CMR RF excitation. RF-Induced Heating was reduced below 2 °C under expected use conditions in vitro. We describe a simple modification to the manufacture of metallic braided catheters that will allow CMR catheterization without RF-Induced Heating under contemporary scanning conditions at 1.5 T. The proposed segmentation pattern largely preserves braid structure and mechanical integrity while interrupting electrical resonance. This inexpensive design may be applicable to both diagnostic and interventional catheters and will help to enable a range of interventional procedures using real time CMR.

Ozgur Kocaturk - One of the best experts on this subject based on the ideXlab platform.

  • real time device tracking under mri using an acousto optic active marker
    Magnetic Resonance in Medicine, 2021
    Co-Authors: Yusuf Samet Yaras, Dursun Korel Yildirim, Daniel A Herzka, Toby Rogers, Adrienne E Campbellwashburn, Robert J Lederman, Levent F Degertekin, Ozgur Kocaturk
    Abstract:

    Purpose 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.

  • a cardiovascular magnetic resonance cmr safe metal braided catheter design for interventional cmr at 1 5 t freedom from radiofrequency Induced Heating and preserved mechanical performance
    Journal of Cardiovascular Magnetic Resonance, 2019
    Co-Authors: Korel D Yildirim, Daniel A Herzka, Adrienne E Campbellwashburn, Ozgur Kocaturk, Burcu Basar, Robert J Lederman
    Abstract:

    Background Catheter designs incorporating metallic braiding have high torque control and kink resistance compared with unbraided alternatives. However, metallic segments longer than a quarter wavelength (~ 12 cm for 1.5 T scanner) are prone to radiofrequency (RF) Induced Heating during cardiovascular magnetic resonance (CMR) catheterization. We designed a braid-reinforced catheter with interrupted metallic segments to mitigate RF-Induced Heating yet retain expected mechanical properties for CMR catheterization.

  • a cardiovascular magnetic resonance cmr safe metal braided catheter design for interventional cmr at 1 5 t freedom from radiofrequency Induced Heating and preserved mechanical performance
    Journal of Cardiovascular Magnetic Resonance, 2019
    Co-Authors: Korel D Yildirim, Daniel A Herzka, Adrienne E Campbellwashburn, Ozgur Kocaturk, Burcu Basar, Robert J Lederman
    Abstract:

    Catheter designs incorporating metallic braiding have high torque control and kink resistance compared with unbraided alternatives. However, metallic segments longer than a quarter wavelength (~ 12 cm for 1.5 T scanner) are prone to radiofrequency (RF) Induced Heating during cardiovascular magnetic resonance (CMR) catheterization. We designed a braid-reinforced catheter with interrupted metallic segments to mitigate RF-Induced Heating yet retain expected mechanical properties for CMR catheterization. We constructed metal wire braided 6 Fr catheter shaft subassemblies using electrically insulated stainless-steel wires and off-the-shelf biocompatible polymers. The braiding was segmented, in-situ, using lasers to create non-resonant wire lengths. We compared the Heating and mechanical performance of segmented- with un-segmented- metal braided catheter shaft subassemblies. The braiding segmentation procedure did not significantly alter the structural integrity of catheter subassemblies, torque response, push-ability, or kink resistance compared with non-segmented controls. Segmentation shortened the electrical length of individually insulated metallic braids, and therefore inhibited resonance during CMR RF excitation. RF-Induced Heating was reduced below 2 °C under expected use conditions in vitro. We describe a simple modification to the manufacture of metallic braided catheters that will allow CMR catheterization without RF-Induced Heating under contemporary scanning conditions at 1.5 T. The proposed segmentation pattern largely preserves braid structure and mechanical integrity while interrupting electrical resonance. This inexpensive design may be applicable to both diagnostic and interventional catheters and will help to enable a range of interventional procedures using real time CMR.

Korel D Yildirim - One of the best experts on this subject based on the ideXlab platform.

  • a cardiovascular magnetic resonance cmr safe metal braided catheter design for interventional cmr at 1 5 t freedom from radiofrequency Induced Heating and preserved mechanical performance
    Journal of Cardiovascular Magnetic Resonance, 2019
    Co-Authors: Korel D Yildirim, Daniel A Herzka, Adrienne E Campbellwashburn, Ozgur Kocaturk, Burcu Basar, Robert J Lederman
    Abstract:

    Background Catheter designs incorporating metallic braiding have high torque control and kink resistance compared with unbraided alternatives. However, metallic segments longer than a quarter wavelength (~ 12 cm for 1.5 T scanner) are prone to radiofrequency (RF) Induced Heating during cardiovascular magnetic resonance (CMR) catheterization. We designed a braid-reinforced catheter with interrupted metallic segments to mitigate RF-Induced Heating yet retain expected mechanical properties for CMR catheterization.

  • a cardiovascular magnetic resonance cmr safe metal braided catheter design for interventional cmr at 1 5 t freedom from radiofrequency Induced Heating and preserved mechanical performance
    Journal of Cardiovascular Magnetic Resonance, 2019
    Co-Authors: Korel D Yildirim, Daniel A Herzka, Adrienne E Campbellwashburn, Ozgur Kocaturk, Burcu Basar, Robert J Lederman
    Abstract:

    Catheter designs incorporating metallic braiding have high torque control and kink resistance compared with unbraided alternatives. However, metallic segments longer than a quarter wavelength (~ 12 cm for 1.5 T scanner) are prone to radiofrequency (RF) Induced Heating during cardiovascular magnetic resonance (CMR) catheterization. We designed a braid-reinforced catheter with interrupted metallic segments to mitigate RF-Induced Heating yet retain expected mechanical properties for CMR catheterization. We constructed metal wire braided 6 Fr catheter shaft subassemblies using electrically insulated stainless-steel wires and off-the-shelf biocompatible polymers. The braiding was segmented, in-situ, using lasers to create non-resonant wire lengths. We compared the Heating and mechanical performance of segmented- with un-segmented- metal braided catheter shaft subassemblies. The braiding segmentation procedure did not significantly alter the structural integrity of catheter subassemblies, torque response, push-ability, or kink resistance compared with non-segmented controls. Segmentation shortened the electrical length of individually insulated metallic braids, and therefore inhibited resonance during CMR RF excitation. RF-Induced Heating was reduced below 2 °C under expected use conditions in vitro. We describe a simple modification to the manufacture of metallic braided catheters that will allow CMR catheterization without RF-Induced Heating under contemporary scanning conditions at 1.5 T. The proposed segmentation pattern largely preserves braid structure and mechanical integrity while interrupting electrical resonance. This inexpensive design may be applicable to both diagnostic and interventional catheters and will help to enable a range of interventional procedures using real time CMR.

Daniel A Herzka - One of the best experts on this subject based on the ideXlab platform.

  • real time device tracking under mri using an acousto optic active marker
    Magnetic Resonance in Medicine, 2021
    Co-Authors: Yusuf Samet Yaras, Dursun Korel Yildirim, Daniel A Herzka, Toby Rogers, Adrienne E Campbellwashburn, Robert J Lederman, Levent F Degertekin, Ozgur Kocaturk
    Abstract:

    Purpose 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.

  • a cardiovascular magnetic resonance cmr safe metal braided catheter design for interventional cmr at 1 5 t freedom from radiofrequency Induced Heating and preserved mechanical performance
    Journal of Cardiovascular Magnetic Resonance, 2019
    Co-Authors: Korel D Yildirim, Daniel A Herzka, Adrienne E Campbellwashburn, Ozgur Kocaturk, Burcu Basar, Robert J Lederman
    Abstract:

    Background Catheter designs incorporating metallic braiding have high torque control and kink resistance compared with unbraided alternatives. However, metallic segments longer than a quarter wavelength (~ 12 cm for 1.5 T scanner) are prone to radiofrequency (RF) Induced Heating during cardiovascular magnetic resonance (CMR) catheterization. We designed a braid-reinforced catheter with interrupted metallic segments to mitigate RF-Induced Heating yet retain expected mechanical properties for CMR catheterization.

  • a cardiovascular magnetic resonance cmr safe metal braided catheter design for interventional cmr at 1 5 t freedom from radiofrequency Induced Heating and preserved mechanical performance
    Journal of Cardiovascular Magnetic Resonance, 2019
    Co-Authors: Korel D Yildirim, Daniel A Herzka, Adrienne E Campbellwashburn, Ozgur Kocaturk, Burcu Basar, Robert J Lederman
    Abstract:

    Catheter designs incorporating metallic braiding have high torque control and kink resistance compared with unbraided alternatives. However, metallic segments longer than a quarter wavelength (~ 12 cm for 1.5 T scanner) are prone to radiofrequency (RF) Induced Heating during cardiovascular magnetic resonance (CMR) catheterization. We designed a braid-reinforced catheter with interrupted metallic segments to mitigate RF-Induced Heating yet retain expected mechanical properties for CMR catheterization. We constructed metal wire braided 6 Fr catheter shaft subassemblies using electrically insulated stainless-steel wires and off-the-shelf biocompatible polymers. The braiding was segmented, in-situ, using lasers to create non-resonant wire lengths. We compared the Heating and mechanical performance of segmented- with un-segmented- metal braided catheter shaft subassemblies. The braiding segmentation procedure did not significantly alter the structural integrity of catheter subassemblies, torque response, push-ability, or kink resistance compared with non-segmented controls. Segmentation shortened the electrical length of individually insulated metallic braids, and therefore inhibited resonance during CMR RF excitation. RF-Induced Heating was reduced below 2 °C under expected use conditions in vitro. We describe a simple modification to the manufacture of metallic braided catheters that will allow CMR catheterization without RF-Induced Heating under contemporary scanning conditions at 1.5 T. The proposed segmentation pattern largely preserves braid structure and mechanical integrity while interrupting electrical resonance. This inexpensive design may be applicable to both diagnostic and interventional catheters and will help to enable a range of interventional procedures using real time CMR.

Adrienne E Campbellwashburn - One of the best experts on this subject based on the ideXlab platform.

  • real time device tracking under mri using an acousto optic active marker
    Magnetic Resonance in Medicine, 2021
    Co-Authors: Yusuf Samet Yaras, Dursun Korel Yildirim, Daniel A Herzka, Toby Rogers, Adrienne E Campbellwashburn, Robert J Lederman, Levent F Degertekin, Ozgur Kocaturk
    Abstract:

    Purpose 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.

  • a cardiovascular magnetic resonance cmr safe metal braided catheter design for interventional cmr at 1 5 t freedom from radiofrequency Induced Heating and preserved mechanical performance
    Journal of Cardiovascular Magnetic Resonance, 2019
    Co-Authors: Korel D Yildirim, Daniel A Herzka, Adrienne E Campbellwashburn, Ozgur Kocaturk, Burcu Basar, Robert J Lederman
    Abstract:

    Background Catheter designs incorporating metallic braiding have high torque control and kink resistance compared with unbraided alternatives. However, metallic segments longer than a quarter wavelength (~ 12 cm for 1.5 T scanner) are prone to radiofrequency (RF) Induced Heating during cardiovascular magnetic resonance (CMR) catheterization. We designed a braid-reinforced catheter with interrupted metallic segments to mitigate RF-Induced Heating yet retain expected mechanical properties for CMR catheterization.

  • a cardiovascular magnetic resonance cmr safe metal braided catheter design for interventional cmr at 1 5 t freedom from radiofrequency Induced Heating and preserved mechanical performance
    Journal of Cardiovascular Magnetic Resonance, 2019
    Co-Authors: Korel D Yildirim, Daniel A Herzka, Adrienne E Campbellwashburn, Ozgur Kocaturk, Burcu Basar, Robert J Lederman
    Abstract:

    Catheter designs incorporating metallic braiding have high torque control and kink resistance compared with unbraided alternatives. However, metallic segments longer than a quarter wavelength (~ 12 cm for 1.5 T scanner) are prone to radiofrequency (RF) Induced Heating during cardiovascular magnetic resonance (CMR) catheterization. We designed a braid-reinforced catheter with interrupted metallic segments to mitigate RF-Induced Heating yet retain expected mechanical properties for CMR catheterization. We constructed metal wire braided 6 Fr catheter shaft subassemblies using electrically insulated stainless-steel wires and off-the-shelf biocompatible polymers. The braiding was segmented, in-situ, using lasers to create non-resonant wire lengths. We compared the Heating and mechanical performance of segmented- with un-segmented- metal braided catheter shaft subassemblies. The braiding segmentation procedure did not significantly alter the structural integrity of catheter subassemblies, torque response, push-ability, or kink resistance compared with non-segmented controls. Segmentation shortened the electrical length of individually insulated metallic braids, and therefore inhibited resonance during CMR RF excitation. RF-Induced Heating was reduced below 2 °C under expected use conditions in vitro. We describe a simple modification to the manufacture of metallic braided catheters that will allow CMR catheterization without RF-Induced Heating under contemporary scanning conditions at 1.5 T. The proposed segmentation pattern largely preserves braid structure and mechanical integrity while interrupting electrical resonance. This inexpensive design may be applicable to both diagnostic and interventional catheters and will help to enable a range of interventional procedures using real time CMR.