Additive Manufacturing of Subject‐Conformal Receive Coils for Magnetic Resonance Imaging. Issue 12 (21st July 2022)

• Record Type: Journal Article
• Authors: Vanduffel, Hanne; Parra‐Cabrera, Cesar; Gsell, Willy; Oliveira‐Silva, Rodrigo; Goossens, Louca; Peeters, Ronald; Himmelreich, Uwe; Van Hooreweder, Brecht; Sakellariou, Dimitrios; Vanduffel, Wim; Ameloot, Rob
• Is Part Of: Advanced materials technologies. Volume 7:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-21
• Subjects: 3D printing -- additive manufacturing -- magnetic resonance imaging -- personalized medicine -- radiofrequency coils; Materials science -- Periodicals; Technological innovations -- Periodicals; Materials science; Technological innovations; Periodicals; 620.1105
• DOI: 10.1002/admt.202200647
• Languages: English
• ISSNs: 2365-709X

Abstract

Abstract: High signal‐to‐noise ratio (SNR) is crucial to obtaining high‐quality magnetic resonance (MR) images. However, a poor fit of fixed‐size radiofrequency (RF) coils to the subject often limits the SNR both in research and clinical magnetic resonance imaging (MRI) practice. Therefore, there is an urgent need to fabricate RF coils that exhibit a close geometrical fit (or are subject conformal) to the to‐be‐imaged region. A range of 3D printing methods are proposed for producing such conformal coils and overcoming constraints in geometrical complexity, production time, and cost. Laser powder bed fusion and stereolithography‐based methods are explored. The fully digital workflow allows for the seamless integration of electromagnetic simulations of geometrically complex coils, resulting in rapid design iterations. SNR gains up to 68% are observed for single 3D‐printed subject‐conformal coils compared to a state‐of‐the‐art commercially available (nonconformal) coil array. In addition to tests on phantoms, a conformal 3D‐printed coil is used to image the metacarpophalangeal joint of the thumb from a volunteer on an MRI scanner to demonstrate the improved image quality. Abstract : Radiofrequency (RF) coils that exhibit a close geometrical fit to the subject being imaged during an magnetic resonance imaging (MRI) scan show a significant increased signal‐to‐noise ratio (SNR) performance compared to general non‐close‐fitting surface coils. 3D printing is explored as a fully digital design, simulation, and fabrication process for the manufacturing of subject‐conformal RF coils as an alternative to conventional fabrication methods.