A5031169372- Advanced MRI Techniques and Applications
- Ultrasound and Hyperthermia Applications
- Atomic and Subatomic Physics Research
- Medical Imaging Techniques and Applications
- Medical Imaging and Pathology Studies
- Energy Harvesting in Wireless Networks
- Spectroscopy Techniques in Biomedical and Chemical Research
- Tissue Engineering and Regenerative Medicine
- Nuclear Physics and Applications
- Elasticity and Material Modeling
- Radiation Therapy and Dosimetry
- Lanthanide and Transition Metal Complexes
CEA Paris-Saclay
2023-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2023-2025
Centre National de la Recherche Scientifique
2023
Université Paris-Saclay
2023
Imagerie par Résonance Magnétique Médicale et Multi-Modalités
2023
Abstract Objective. Ultra-high field MRI with parallel transmission (pTx) provides a powerful neuroimaging tool potential application in pediatrics. The use of pTx, however, necessitates dedicated local specific absorption rate (SAR) management strategy, able to predict and monitor the peak SAR (pSAR 10g ). In this work, we address pSAR assessment for an in-house built 7 T 16Tx32Rx pediatric head coil, using concept virtual observation points (VOPs) estimation. Approach . We base our study...
Motivation: Pediatric MRI neuroimaging has become common practice at 1.5 and 3 Tesla we see the emergence of 7T parallel transmission (pTX). However, today relevant local SAR prediction models are based on adult standards. Goal(s): In this work, study with pTX for children population (6 to 14 years old) using RF electric field simulations. Approach: We exploit a vast simulation database build pediatric model propose methodology its initial validation convex optimization. Results: A large...
Abstract Purpose Testing an RF coil prototype on subjects involves laborious verifications to ensure its safety. In particular, it requires preliminary electromagnetic simulations and their validations phantoms accurately predict the specific absorption rate (SAR). For design validation with a simpler safety procedure, restricted SAR (rS) mode is proposed, enabling representative first experiments in vivo. The goal of developed approach accelerate transition custom system from clinical use....
This work promotes the RF coil elaboration facilitating its in-vivo testing phase. To exclude patient risk, studies with each new configuration require prior SAR verifications and commission approval lengthening design process. The so-called “Restricted SAR” (rS) protocol offers a solution to safely use homemade coils in vivo at any development stage without validation. constrains transmitted power automatically respects safety limits, whatever distribution. Here, we...
In this work, we propose to extend the capacities of ultra-low SAR protocol used in coil design. A developed restricted holds worst-case below threshold by constraining total transmitted RF power. Since reflects tissue heating, exploit a conservative thermal model derive relaxed constraints depending on acquisition time. This enables options available for sequences played under mode, including fat suppression, higher image resolution, or decreased TR.