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Enabling Hybrid Real Time and Retrospectively Gated Imaging in a Numerical Phantom
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH).
2023 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Simultan Realtid och Hjärttidssorterad Avbildning med en Radial-Spiral Hybridutläsning i ett Numeriskt Fantom (Swedish)
Abstract [en]

Sector-Wise Golden Angle (SWIG) is a novel approach that was developed to address the limitations associated with Golden Angle radial imaging, commonly used for high temporal resolution flow measurements. Golden angle radial imaging is a time-efficient method that effectively reduces motion sensitivity. However, binned or retrospectively gated imaging where multiple heartbeats are utilized to acquire a single time series may lead to uneven coverage of k- space, ultimately resulting in poor image quality. In contrast, SWIG restricts the radial profiles to a sector of k-space per heartbeat, ensuring even distributions of spokes during retrospectively gated acquisitions. One drawback of SWIG is the loss of ability to reconstruct real-time images. The combination of sorted and unsorted acquisition simultaneously holds significant potential and could be applied in various domains. The goal of the thesis work was to design a trajectory that combines radial and spiral k-space sampling, enabling hybrid real-time and retrospectively gated imaging. The objective was to obtain an image series with comparable quality to a SWIG readout while retaining the ability to reconstruct a low-resolution real-time image series from the same data. To evaluate the hybrid trajectory, the numerical phantom XCAT was used to generate synthetic MRI images. Binned images were sampled using a hybrid-SWIG method, yielding similar image quality to a conventional SWIG image series, with the added benefit of being able to reconstruct a low-resolution real-time image series. Although the current method was only evaluated in a numerical phantom and may require additional adjustment to be suitable for a real MRI scanner, the results show that it is possible to combine radial and spiral imaging in a single readout.

Place, publisher, year, edition, pages
2023. , p. 46
Series
TRITA-CBH-GRU ; 2023:066
Keywords [en]
Cardiovascular Magnetic resonance Imaging (CMR), Sector Wise Golden-Angle (SWIG)
National Category
Medical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-329393OAI: oai:DiVA.org:kth-329393DiVA, id: diva2:1771127
External cooperation
Karolinska Institutet
Subject / course
Medical Engineering
Educational program
Master of Science in Engineering - Medical Engineering
Supervisors
Examiners
Available from: 2023-06-29 Created: 2023-06-20 Last updated: 2023-06-29Bibliographically approved

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CiteExportLink to record
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