“… Fig. 1 40 mm Mg-based orthopaedic compression screw MAGNEZIX® CS ø 3.2 (top) and Ti equivalent (bottom), reproduced under the CC BY-NC-ND 4.0 License [ 9 ]. …”
Section: Methodsmentioning
confidence: 99%
“…Postoperative care of orthopaedic implants is aided by imaging of implantation sites to monitor the healing process of surrounding bone and tissues, and to assess the implant status [ [7] , [8] , [9] ]. MRI presents a viable approach for the examination of implantation sites due to its superb bone-soft tissue contrast and the use of non-ionizing radiation.…”
Section: Introductionmentioning
confidence: 99%
“…MRI presents a viable approach for the examination of implantation sites due to its superb bone-soft tissue contrast and the use of non-ionizing radiation. Mg-based implants have shown to be compatible with MRI providing good visualization due to their lower metallic artefact production [ 9 ]. However, the metallic and electrically conductive nature of Mg-based and other metallic implants constitutes challenges for MRI.…”
“… Fig. 1 40 mm Mg-based orthopaedic compression screw MAGNEZIX® CS ø 3.2 (top) and Ti equivalent (bottom), reproduced under the CC BY-NC-ND 4.0 License [ 9 ]. …”
Section: Methodsmentioning
confidence: 99%
“…Postoperative care of orthopaedic implants is aided by imaging of implantation sites to monitor the healing process of surrounding bone and tissues, and to assess the implant status [ [7] , [8] , [9] ]. MRI presents a viable approach for the examination of implantation sites due to its superb bone-soft tissue contrast and the use of non-ionizing radiation.…”
Section: Introductionmentioning
confidence: 99%
“…MRI presents a viable approach for the examination of implantation sites due to its superb bone-soft tissue contrast and the use of non-ionizing radiation. Mg-based implants have shown to be compatible with MRI providing good visualization due to their lower metallic artefact production [ 9 ]. However, the metallic and electrically conductive nature of Mg-based and other metallic implants constitutes challenges for MRI.…”
“…These interferences may manifest as nonuniform image intensities, signal shading, signal voids, or signal intensity elevation in the vicinity of the implant, all of which bear the potential to spoil the benefits of MRI due to non-diagnostic image quality. Owing to the shape, location, and orientation of a conductive implant, also depending on the RF excitation vector in parallel RF transmission (pTx), the level of RF-induced heating and RF transmission field distortions may vary [18,19].…”
Postoperative care of orthopedic implants is aided by imaging to assess the healing process and the implant status. MRI of implantation sites might be compromised by radiofrequency (RF) heating and RF transmission field (B1+) inhomogeneities induced by electrically conducting implants. This study examines the applicability of safe and B1+-distortion-free MRI of implantation sites using optimized parallel RF field transmission (pTx) based on a multi-objective genetic algorithm (GA). Electromagnetic field simulations were performed for eight eight-channel RF array configurations (f = 297.2 MHz), and the most efficient array was manufactured for phantom experiments at 7.0 T. Circular polarization (CP) and orthogonal projection (OP) algorithms were applied for benchmarking the GA-based shimming. B1+ mapping and MR thermometry and imaging were performed using phantoms mimicking muscle containing conductive implants. The local SAR10g of the entire phantom in GA was 12% and 43.8% less than the CP and OP, respectively. Experimental temperature mapping using the CP yielded ΔT = 2.5–3.0 K, whereas the GA induced no extra heating. GA-based shimming eliminated B1+ artefacts at implantation sites and enabled uniform gradient-echo MRI. To conclude, parallel RF transmission with GA-based excitation vectors provides a technical foundation en route to safe and B1+-distortion-free MRI of implantation sites.
“…Recent work considering RDD has been reported in the literature; see e These regard USI-guided DD enhancement, microbubble-mediated USI DD, m patches for DD, DD to cancer cells, spatial, temporal, and dose control of DD, cles-based strategies to improve the delivery of therapeutic RNA in precision nanoparticle-based delivery systems in pancreatic cancer, and nano-drug deliv for cancer. Contributions on implanted technologies and their concerns could e.g., in [51][52][53][54][55][56][57][58][59]. These concern artefacts of biodegradable magnesium-based im sessment of implant-related pain and dysfunction, cochlear implant positioni imaging quality, adverse local tissue reactions near metal implants after total plasty, metal artefact reduction sequences for a piezoelectric bone conductio image quality and artifact reduction of a cochlear implant, MRI in patients w implantable electronic devices, and MRI artifacts caused by auditory implants treatment structures might manage confined conduct MI-imbedded equipm structures employ RDD for nearby tissue containing a specified area.…”
This contribution is part of the objective of diligent universal care that ensures the well-being of a patient. It aims to analyze and propose enriched image-guided procedures for surgical interventions and restricted delivery of implanted drugs in minimally invasive and non-ionizing circumstances. This analysis is supported by a literature review conducted in two ways. The first aims to illustrate the importance of recent research and applications involved in different topics of the subject; this is mainly the case for the introduction’s literature. The second concerns the literature dedicated to having more detailed information in context; this mainly concerns the citations in the different sections of the article. The universal goals of medical treatments are intended to involve the well-being of the patient and allow medical personnel to test new therapies and carry out therapeutic training without risk to the patient. First, the various functionalities involved in these procedures and the concerns of the magnetic resonance imaging technique (MRI) and ultrasound imaging technique (USI), recent contributions to the subject are reviewed. Second, the intervention procedures guided by the image and the implemented actions are analyzed. Third, the components of the fields involved in MRI are examined. Fourth, the MRI control of the treatments, its performance and its compliance are analyzed. Compatibility with MRI via electromagnetic compatibility (EMC) is conferred and demonstrated for an actuation example. Fifth, the extension of the concepts mentioned in the article, in the context of patient comfort and the training of medical staff is proposed. The main contribution of this article is the identification of the different strategic aids needed in healthcare related to image-assisted robotics, non-ionized, minimally invasive and locally restrictive means. Furthermore, it highlights the benefits of using phantoms based on real biological properties of the body, digital twins under human control, artificial intelligence tools and augmented reality-assisted robotics.
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