Skip to main content
Journal cover image

MRI active guidewire with an embedded temperature probe and providing a distinct tip signal to enhance clinical safety.

Publication ,  Journal Article
Sonmez, M; Saikus, CE; Bell, JA; Franson, DN; Halabi, M; Faranesh, AZ; Ozturk, C; Lederman, RJ; Kocaturk, O
Published in: Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance
June 2012

The field of interventional cardiovascular MRI is hampered by the unavailability of active guidewires that are both safe and conspicuous. Heating of conductive guidewires is difficult to predict in vivo and disruptive to measure using external probes. We describe a clinical-grade 0.035" (0.89 mm) guidewire for MRI right and left heart catheterization at 1.5 T that has an internal probe to monitor temperature in real-time, and that has both tip and shaft visibility as well as suitable flexibility.The design has an internal fiberoptic temperature probe, as well as a distal solenoid to enhance tip visibility on a loopless antenna. We tested different tip-solenoid configurations to balance heating and signal profiles. We tested mechanical performance in vitro and in vivo in comparison with a popular clinical nitinol guidewire.The solenoid displaced the point of maximal heating ("hot spot") from the tip to a more proximal location where it can be measured without impairing guidewire flexion. Probe pullback allowed creation of lengthwise guidewire temperature maps that allowed rapid evaluation of design prototypes. Distal-only solenoid attachment offered the best compromise between tip visibility and heating among design candidates. When fixed at the hot spot, the internal probe consistently reflected the maximum temperature compared external probes.Real-time temperature monitoring was performed during porcine left heart catheterization. Heating was negligible using normal operating parameters (flip angle, 45°; SAR, 1.01 W/kg); the temperature increased by 4.2°C only during high RF power mode (flip angle, 90°; SAR, 3.96 W/kg) and only when the guidewire was isolated from blood cooling effects by an introducer sheath. The tip flexibility and in vivo performance of the final guidewire design were similar to a popular commercial guidewire.We integrated a fiberoptic temperature probe inside a 0.035" MRI guidewire. Real-time monitoring helps detect deleterious heating during use, without impairing mechanical guidewire operation, and without impairing MRI visibility. We therefore need not rely on prediction to ensure safe clinical operation. Future implementations may modulate specific absorption rate (SAR) based on temperature feedback.

Altmetric Attention Stats
Dimensions Citation Stats

Published In

Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance

DOI

EISSN

1532-429X

ISSN

1097-6647

Publication Date

June 2012

Volume

14

Start / End Page

38

Related Subject Headings

  • Temperature
  • Swine
  • Pliability
  • Optical Fibers
  • Nuclear Medicine & Medical Imaging
  • Magnetic Resonance Imaging, Interventional
  • Magnetic Resonance Imaging, Cine
  • Heart Diseases
  • Equipment Design
  • Disease Models, Animal
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Sonmez, M., Saikus, C. E., Bell, J. A., Franson, D. N., Halabi, M., Faranesh, A. Z., … Kocaturk, O. (2012). MRI active guidewire with an embedded temperature probe and providing a distinct tip signal to enhance clinical safety. Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance, 14, 38. https://doi.org/10.1186/1532-429x-14-38
Sonmez, Merdim, Christina E. Saikus, Jamie A. Bell, Dominique N. Franson, Majdi Halabi, Anthony Z. Faranesh, Cengizhan Ozturk, Robert J. Lederman, and Ozgur Kocaturk. “MRI active guidewire with an embedded temperature probe and providing a distinct tip signal to enhance clinical safety.Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance 14 (June 2012): 38. https://doi.org/10.1186/1532-429x-14-38.
Sonmez M, Saikus CE, Bell JA, Franson DN, Halabi M, Faranesh AZ, et al. MRI active guidewire with an embedded temperature probe and providing a distinct tip signal to enhance clinical safety. Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance. 2012 Jun;14:38.
Sonmez, Merdim, et al. “MRI active guidewire with an embedded temperature probe and providing a distinct tip signal to enhance clinical safety.Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance, vol. 14, June 2012, p. 38. Epmc, doi:10.1186/1532-429x-14-38.
Sonmez M, Saikus CE, Bell JA, Franson DN, Halabi M, Faranesh AZ, Ozturk C, Lederman RJ, Kocaturk O. MRI active guidewire with an embedded temperature probe and providing a distinct tip signal to enhance clinical safety. Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance. 2012 Jun;14:38.
Journal cover image

Published In

Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance

DOI

EISSN

1532-429X

ISSN

1097-6647

Publication Date

June 2012

Volume

14

Start / End Page

38

Related Subject Headings

  • Temperature
  • Swine
  • Pliability
  • Optical Fibers
  • Nuclear Medicine & Medical Imaging
  • Magnetic Resonance Imaging, Interventional
  • Magnetic Resonance Imaging, Cine
  • Heart Diseases
  • Equipment Design
  • Disease Models, Animal