Abstract #2699

Accuracy of relative pressure measurements from 3D PC-MR data using realistic aortic coarctation phantoms

Jesús Urbina^1,2, Julio Sotelo^1,3, Cristian Montalba¹, Felipe Valenzuela^1,3, Cristián Tejos^1,3, Pablo Irarrázaval^1,3, Marcelo Andia^1,4, Israel Valverde^5,6, and Sergio Uribe^1,4

¹Biomedical Imaging Center, Pontificia Universidad Católica de Chile, Santiago, Chile, ²School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile, ³Electrical Engineering Department, Pontificia Universidad Católica de Chile, Santiago, Chile, ⁴Radiology Department, Pontificia Universidad Católica de Chile, Santiago, Chile, ⁵Pediatric Cardiology Unit, Hospital Virgen del Rocio, Seville, Spain, ⁶Institute of Biomedicine of Seville, Universidad de Sevilla, Seville, Spain

The aim of this work was to evaluate the accuracy of relative pressures obtained from 3D PC-MRI in a realistic aortic phantom with different grades of aortic coarctations at rest and stress conditions. We also evaluated the accuracy of the relative pressures when subjected to different aortic segmentation and spatial resolutions. The accuracy of the 3D PC-MRI is excellent compared with catheterization values with mild to moderate AoCo at rest and stress conditions. Also, relative pressures were in excellent accuracy with catheterization values when the aortic segmentation only included laminar flow and with higher spatial resolution at rest and stress conditions. However, its accuracy decreases for severe AoCo cases.

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