The purpose of this work was to demonstrate the capability of magnetic particle imaging (MPI) to assess the hemodynamics in a realistic 3D aneurysm model obtained by additive manufacturing. MPI was compared with magnetic resonance imaging (MRI) and dynamic digital subtraction angiography (DSA)

Buhk, Jan-Hendrik

Faizy, Tobias Djamsched

Fiehler, Jens

Forkert, Nils Daniel

Frölich, Andreas M. J.

Knopp, Tobias

Krause, Dieter

Sedlacik, Jan

Spallek, Johanna

Sznitman, Josué

Werner, Franziska

PLoS ONE

PubMed

Open Access Repository Technischen Universität Hamburg

Magnetic particle imaging for high temporal resolution assessment of aneurysm hemodynamics

<div>PurposeThe purpose of this work was to demonstrate the capability of magnetic particle imaging (MPI) to assess the hemodynamics in a realistic 3D aneurysm model obtained by additive manufacturing. MPI was compared with magnetic resonance imaging (MRI) and dynamic digital subtraction angiography (DSA).Materials and MethodsThe aneurysm model was of saccular morphology (7 mm dome height, 5 mm cross-section, 3–4 mm neck, 3.5 mm parent artery diameter) and connected to a peristaltic pump delivering a physiological flow (250 mL/min) and pulsation rate (70/min). High-resolution (4 h long) 4D phase contrast flow quantification (4D pc-fq) MRI was used to directly assess the hemodynamics of the model. Dynamic MPI, MRI, and DSA were performed with contrast agent injections (3 mL volume in 3 s) through a proximally placed catheter.Results and Discussion4D pc-fq measurements showed distinct pulsatile flow velocities (20–80 cm/s) as well as lower flow velocities and a vortex inside the aneurysm. All three dynamic methods (MPI, MRI, and DSA) also showed a clear pulsation pattern as well as delayed contrast agent dynamics within the aneurysm, which is most likely caused by the vortex within the aneurysm. Due to the high temporal resolution of MPI and DSA, it was possible to track the contrast agent bolus through the model and to estimate the average flow velocity (about 60 cm/s), which is in accordance with the 4D pc-fq measurements.ConclusionsThe ionizing radiation free, 4D high resolution MPI method is a very promising tool for imaging and characterization of hemodynamics in human. It carries the possibility of overcoming certain disadvantages of other modalities like considerably lower temporal resolution of dynamic MRI and limited 2D characteristics of DSA. Furthermore, additive manufacturing is the key for translating powerful pre-clinical techniques into the clinic.</div

Jan Sedlacik (222775)

Andreas Frölich (45239)

Johanna Spallek (3142107)

Nils D. Forkert (2513092)

Tobias D. Faizy (3142110)

Franziska Werner (551407)

Tobias Knopp (2818258)

Dieter Krause (3142104)

Jens Fiehler (702840)

Jan-Hendrik Buhk (815544)

FigShare

Magnetic Particle Imaging for High Temporal Resolution Assessment of Aneurysm Hemodynamics

The purpose of this work was to demonstrate the capability of magnetic particle imaging (MPI) to assess the hemodynamics in a realistic 3D aneurysm model obtained by additive manufacturing. MPI was compared with magnetic resonance imaging (MRI) and dynamic digital subtraction angiography (DSA).The aneurysm model was of saccular morphology (7 mm dome height, 5 mm cross-section, 3-4 mm neck, 3.5 mm parent artery diameter) and connected to a peristaltic pump delivering a physiological flow (250 mL/min) and pulsation rate (70/min). High-resolution (4 h long) 4D phase contrast flow quantification (4D pc-fq) MRI was used to directly assess the hemodynamics of the model. Dynamic MPI, MRI, and DSA were performed with contrast agent injections (3 mL volume in 3 s) through a proximally placed catheter.4D pc-fq measurements showed distinct pulsatile flow velocities (20-80 cm/s) as well as lower flow velocities and a vortex inside the aneurysm. All three dynamic methods (MPI, MRI, and DSA) also showed a clear pulsation pattern as well as delayed contrast agent dynamics within the aneurysm, which is most likely caused by the vortex within the aneurysm. Due to the high temporal resolution of MPI and DSA, it was possible to track the contrast agent bolus through the model and to estimate the average flow velocity (about 60 cm/s), which is in accordance with the 4D pc-fq measurements.The ionizing radiation free, 4D high resolution MPI method is a very promising tool for imaging and characterization of hemodynamics in human. It carries the possibility of overcoming certain disadvantages of other modalities like considerably lower temporal resolution of dynamic MRI and limited 2D characteristics of DSA. Furthermore, additive manufacturing is the key for translating powerful pre-clinical techniques into the clinic

Jan Sedlacik

Andreas Frölich

Johanna Spallek

Nils D Forkert

Tobias D Faizy

Franziska Werner

Tobias Knopp

Dieter Krause

Jens Fiehler

Jan-Hendrik Buhk

Directory of Open Access Journals

Magnetic Particle Imaging for High Temporal Resolution Assessment of Aneurysm Hemodynamics.

TUHH Open Research (TORE)

http://dx.doi.org/10.1371/journal.pone.0160097

Magnetic particle imaging for high temporal resolution assessment of aneurysm hemodynamics

Abstract

Similar works

Full text

Available Versions

Open Access Repository Technischen Universität Hamburg

FigShare

Directory of Open Access Journals

TUHH Open Research (TORE)