Open structure magnetic particle imaging by nonlinear back projection tomography reconstruction
Author:
Zu Wanni1ORCID, Ke Li1, Du Qiang1
Affiliation:
1. School of Electrical Engineering , Shenyang University of Technology , Shenyang , China
Abstract
Abstract
Objectives
In open structure MPI systems, the nonlinear variation of the field free lines in the large region of interest scanning process distorts the x-space image reconstruction. In this study, we propose a nonlinear field free line projection reconstruction algorithm to solve the edge distortion problem of open structure MPI imaging.
Methods
First, we calculate the curvature change law of the field free line in the scanning process. Then, we design a nonlinear back projection reconstruction algorithm according to the nonlinear characteristics of the field free line in the scanning process. Finally, the nonlinear back projection reconstruction algorithm is used to complete the tomography of blood vessels.
Results
The numerical calculation and simulation results show that the open structure MPI combined with a nonlinear back projection reconstruction algorithm can accomplish vascular fault reconstruction. The reconstruction algorithm proposed in this paper suppresses the edge distortion of the image and improves the positioning accuracy of the image. The size of the region of interest where distortions are low is increased 16 times by allowing 10.9% degradation in the gradient.
Conclusions
We provide a non-linear inverse projection reconstruction algorithm to reduce the structural artefacts caused by FFL distortion. It provides a reconstruction scheme for a large region of interest fine imaging of open structure FFL-MPI.
Funder
The National Nature Science Foundation of China The tackling-key project from Liaoning Education Department Liaoning Provincial Education Department Scientific Research Project
Publisher
Walter de Gruyter GmbH
Subject
Biomedical Engineering
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