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Tobias Redlich

Publications and source records attributed to Tobias Redlich.

2 recordsLinked to original sources

Federated Sharing and Continuous Improvement of Medical Device Knowledge Artifacts: A Conceptual Model

Healthcare organisations use digital systems to exchange information from clinical cases. Medical centres with digital production facilities create device designs during care. These designs and production records often remain at the site that made them. Other sites may struggle to find a suitable design or learn what happened when staff used it. Mobile medical centres may also lose access when they work away from hospital systems. This paper proposes an artifact-centred model for a federated exchange infrastructure that lets hospitals and mobile medical centres share and improve medical knowledge while controlling their own records and decisions. An integrative literature review screened 910 records and mapped 240 publications across six questions. We read 72 publications in detail to trace the path from local use to a decision about shared knowledge. The review found no common process that links a record of local use to a decision about changing the knowledge shared with later users. The model keeps case data at each site and records which artifact version informed each use. Federation lets sites share reviewed versions and return records from use for review. Mobile units can receive artifacts before deployment and record their use while offline. After reconnecting, they can exchange these records with other sites. Point-of-care manufacturing shows how a medical device knowledge artifact connects a design to production records while the care site controls product release. Federation could form a governed learning network where one site's experience improves medical knowledge artifacts used elsewhere while authority remains local.

cs.CY

Shimmer: End-to-End Open-Source Passive B0 Shimming Methodology for Low-Field MRI Magnets

Low-field MRI scanners based on permanent magnet arrays require accurate B0 shimming to achieve sufficient field homogeneity for imaging. Here, we present Shimmer, an open-source methodology for passive shimming of low-field MRI magnets using additional NdFeB magnets placed outside the main magnet array. The end-to-end methodology combines magnetic field mapping, magnetic field simulations, numerical optimization of shim magnet positions and orientations, and automated generation of 3D-printable shim holders. Continuous magnet rotations and several optimization strategies are considered and evaluated. The method was validated and applied to three different permanent magnet arrays ~50 mT in 200 mm diameter spherical volumes, reducing initial field inhomogeneities of 9361ppm, 31721 ppm and 34143 ppm to 888 ppm, 1812 ppm and 1602 ppm respectively. The improved homogeneity enabled undistorted MR imaging of a phantom. Shimmer provides a reproducible and adaptable approach for improving the performance of low-field MRI magnets.

physics.med-ph