Use of the Perturbing Sphere Method for the Estimation of Radiofrequency Coils’ Efficiency in Magnetic Resonance Applications: Experience from an Electromagnetic Laboratory
Abstract
:1. Introduction
2. Perturbing Sphere Method
3. Workbench Measurements
4. Coil Efficiency Measurements Performed in Our Lab
5. Discussion
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Birdcage Typology | Q | η (μT/W1/2) | |
---|---|---|---|
35 μm thickness strip conductor and standard-quality capacitors | 21 | 11.92 | 2.6 |
35 μm thickness strip conductor and high-quality capacitors | 228 | 34.61 | 2.2 |
800 μm thickness strip conductor and high-quality capacitors | 374 | 42.74 | 2.3 |
Wire conductor and high-quality capacitors | 477 | 52.31 | 2.4 |
Experiment | Rat Coil η (μT/W1/2) | Pig Coil η (μT/W1/2) | Rat/Pig η Ratio |
---|---|---|---|
Workbench efficiency test with steel sphere | 20.92 | 2.21 | 9.47 |
Workbench efficiency test with lead sphere | 20.66 | 2.28 | 9.06 |
MR scanner efficiency test with lead sphere | 21.89 | 1.48 | 14.8 |
Circular Coil | Q | η (μT/W1/2) | |
---|---|---|---|
Strip conductor | 315 | 9.48 | 0.53 |
Wire conductor | 345 | 11.01 | 0.57 |
Efficiency Measurement Method | η (μT/W1/2) |
---|---|
Perturbing loop | 25.65 ± 1.76 |
Perturbing sphere | 26.40 ± 0.52 |
Pickup loop | 26.24 |
Nutation | 25.10 |
Coil Efficiency | z = 0 cm | z = 1.3 cm |
---|---|---|
η (μT/W1/2) | 30.13 ± 0.44 | 17.91 ± 0.63 |
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Giovannetti, G.; Frijia, F. Use of the Perturbing Sphere Method for the Estimation of Radiofrequency Coils’ Efficiency in Magnetic Resonance Applications: Experience from an Electromagnetic Laboratory. Sensors 2024, 24, 5705. https://doi.org/10.3390/s24175705
Giovannetti G, Frijia F. Use of the Perturbing Sphere Method for the Estimation of Radiofrequency Coils’ Efficiency in Magnetic Resonance Applications: Experience from an Electromagnetic Laboratory. Sensors. 2024; 24(17):5705. https://doi.org/10.3390/s24175705
Chicago/Turabian StyleGiovannetti, Giulio, and Francesca Frijia. 2024. "Use of the Perturbing Sphere Method for the Estimation of Radiofrequency Coils’ Efficiency in Magnetic Resonance Applications: Experience from an Electromagnetic Laboratory" Sensors 24, no. 17: 5705. https://doi.org/10.3390/s24175705