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Development of an MR-compatible, rotation-insensitive, annular pressure sensor.

M K Konings¹, L W Bartels, C J Bakker

¹Department of Radiology, Image Sciences Institute, University Hospital Utrecht, The Netherlands. m.konings@azu.nl

Physics in Medicine and Biology

|February 24, 2001

Summary

A novel MR-compatible pressure sensor, Annupres, accurately measures blood pressure during intravascular interventions. This innovation overcomes limitations of existing sensors, enabling better hemodynamic assessment of stenosis.

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Area of Science:

Biomedical Engineering
Medical Imaging
Cardiovascular Interventions

Background:

Growing interest in MR imaging-guided intravascular interventions.
Need for simultaneous flow and pressure measurements for stenosis assessment.
Limitations of existing optical pressure sensors due to unilateral measurements and angular dependence.

Purpose of the Study:

To develop a novel optical, MR-compatible pressure sensor (Annupres) for intravascular interventions.
To overcome angular artefacts associated with existing pressure sensors.
To enable intrinsic rotation insensitivity for reliable pressure measurements.

Main Methods:

Development of an optical pressure sensor utilizing a novel annular element.
Application of circularly polarized light for rotationally insensitive measurements.

Related Experiment Videos

Testing the Annupres sensor in an experimental setup for pressure measurement validation.

Main Results:

The Annupres sensor demonstrated reliable pressure measurements within the 50-180 mmHg range.
Achieved an accuracy of 1.5% in experimental testing.
The annular element design and use of circularly polarized light eliminated angular artefacts.

Conclusions:

The developed Annupres sensor is a viable MR-compatible tool for intravascular interventions.
It provides accurate and rotationally independent pressure measurements, crucial for hemodynamic assessment.
This technology enhances the capabilities of MR-guided interventions for stenosis evaluation.