Meeting Banner
Abstract #0325

Contactless Fiber-Optic Photoplethysmography-based Gating for Flow MRI.

Sébastien Emery1, Maximilian Fütterer1, and Sebastian Kozerke1
1ETH and University of Zürich, Zürich, Switzerland

Synopsis

Keywords: Data Acquisition, Acquisition Methods

Motivation: To reduce setup times of cine Flow MRI by using contactless fiber-optic photoplethysmography (PPG) on the forehead.

Goal(s): To achieve robust contactless cardiac gating with minimal latency and acceptable jitter using contactless PPG.

Approach: Undersampled, retrospectively-gated 2D and 4D flow MRI data were acquired with simultaneous contactless forehead-PPG and reference ECG recordings. Velocities were reconstructed with locally-low-rank reconstruction after cardiac binning based on either forehead-PPG or ECG.

Results: Using forehead-PPG, we found a mean gating delay of 107.2±18.2ms with a jitter of 4.8±3.2ms for 2D scans, and 103.1±13.4ms with a jitter of 7.9±0.7ms for 4D scans, relative to ECG, yielding comparable velocity data.

Impact: Contact forehead-PPG offers a simple approach to cardiac gating with reduced latency relative to peripheral pulse units, potentially easing clinical workload and enhancing patient comfort.

How to access this content:

For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.

After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.

After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.

Click here for more information on becoming a member.

Keywords