RF-Induced Heating Estimation of a Stent in a 3T MRI Using Transfer Function Approach With a Tabletop E-Field Generator
The use of a transfer function (TF) method enables a conservative estimation for radio frequency (RF) safety assessment of active implantable devices (AIMDs). The TF approach can be applied to various scan conditions, patient populations, and device trajectories inside the human body, reducing the c...
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2024-01-01
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| author | Hongbae Jeong Joshua W. Guag Ananda Kumar |
| author_facet | Hongbae Jeong Joshua W. Guag Ananda Kumar |
| author_sort | Hongbae Jeong |
| collection | DOAJ |
| description | The use of a transfer function (TF) method enables a conservative estimation for radio frequency (RF) safety assessment of active implantable devices (AIMDs). The TF approach can be applied to various scan conditions, patient populations, and device trajectories inside the human body, reducing the computational burden of full-wave electromagnetic (EM) simulation. The in vitro TF model validation process is time-consuming, requiring tests in various sample trajectories that collectively exceed eight hours. Here, we demonstrated reducing the burden of the TF approach using a low-power tabletop E-field generator. We measured the TF of the stent via the piecewise excitation method at 128 MHz and validated it by exposing the device under diverse test exposure fields using a tabletop E-field generator that requires less phantom material, lower cost than whole-body coil or MRI scanner, and with reduced experimental safety hazards or shielded room requirements. The TF approach was used to predict radio frequency (RF)-induced power near the stent tip at 128 MHz and predicted values were then compared against measured values. We also used a body transmit coil to compare the conventional in vitro TF model validation approach and tabletop E-field generator. With the tabletop E-field generator, the equivalent absolute normalized error was (<inline-formula> <tex-math notation="LaTeX">$0.37~\pm ~0.31$ </tex-math></inline-formula> dB) compared to the body transmit coil tests (<inline-formula> <tex-math notation="LaTeX">$0.43~\pm ~0.15$ </tex-math></inline-formula> dB), and the required test time decreased from eight to three hours. In summary, we showed how a low-power compact E-field generator can be used for in vitro TF model validation with reduced testing time and cost without using a shielded room. |
| format | Article |
| id | doaj-art-162a370ca4a74affb7931da66825c7b9 |
| institution | Kabale University |
| issn | 2169-3536 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IEEE |
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| series | IEEE Access |
| spelling | doaj-art-162a370ca4a74affb7931da66825c7b92024-12-21T00:00:45ZengIEEEIEEE Access2169-35362024-01-011219194519195410.1109/ACCESS.2024.351897410804130RF-Induced Heating Estimation of a Stent in a 3T MRI Using Transfer Function Approach With a Tabletop E-Field GeneratorHongbae Jeong0https://orcid.org/0000-0003-4908-2070Joshua W. Guag1Ananda Kumar2Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD, USAOffice of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD, USAOffice of Science and Engineering Laboratories, Center for Devices and Radiological Health, U.S. Food and Drug Administration, Silver Spring, MD, USAThe use of a transfer function (TF) method enables a conservative estimation for radio frequency (RF) safety assessment of active implantable devices (AIMDs). The TF approach can be applied to various scan conditions, patient populations, and device trajectories inside the human body, reducing the computational burden of full-wave electromagnetic (EM) simulation. The in vitro TF model validation process is time-consuming, requiring tests in various sample trajectories that collectively exceed eight hours. Here, we demonstrated reducing the burden of the TF approach using a low-power tabletop E-field generator. We measured the TF of the stent via the piecewise excitation method at 128 MHz and validated it by exposing the device under diverse test exposure fields using a tabletop E-field generator that requires less phantom material, lower cost than whole-body coil or MRI scanner, and with reduced experimental safety hazards or shielded room requirements. The TF approach was used to predict radio frequency (RF)-induced power near the stent tip at 128 MHz and predicted values were then compared against measured values. We also used a body transmit coil to compare the conventional in vitro TF model validation approach and tabletop E-field generator. With the tabletop E-field generator, the equivalent absolute normalized error was (<inline-formula> <tex-math notation="LaTeX">$0.37~\pm ~0.31$ </tex-math></inline-formula> dB) compared to the body transmit coil tests (<inline-formula> <tex-math notation="LaTeX">$0.43~\pm ~0.15$ </tex-math></inline-formula> dB), and the required test time decreased from eight to three hours. In summary, we showed how a low-power compact E-field generator can be used for in vitro TF model validation with reduced testing time and cost without using a shielded room.https://ieeexplore.ieee.org/document/10804130/Magnetic resonance imaging (MRI)transfer function model validationMR safetyregulatory science toolsMITS-TTspecific absorption rate (SAR) |
| spellingShingle | Hongbae Jeong Joshua W. Guag Ananda Kumar RF-Induced Heating Estimation of a Stent in a 3T MRI Using Transfer Function Approach With a Tabletop E-Field Generator IEEE Access Magnetic resonance imaging (MRI) transfer function model validation MR safety regulatory science tools MITS-TT specific absorption rate (SAR) |
| title | RF-Induced Heating Estimation of a Stent in a 3T MRI Using Transfer Function Approach With a Tabletop E-Field Generator |
| title_full | RF-Induced Heating Estimation of a Stent in a 3T MRI Using Transfer Function Approach With a Tabletop E-Field Generator |
| title_fullStr | RF-Induced Heating Estimation of a Stent in a 3T MRI Using Transfer Function Approach With a Tabletop E-Field Generator |
| title_full_unstemmed | RF-Induced Heating Estimation of a Stent in a 3T MRI Using Transfer Function Approach With a Tabletop E-Field Generator |
| title_short | RF-Induced Heating Estimation of a Stent in a 3T MRI Using Transfer Function Approach With a Tabletop E-Field Generator |
| title_sort | rf induced heating estimation of a stent in a 3t mri using transfer function approach with a tabletop e field generator |
| topic | Magnetic resonance imaging (MRI) transfer function model validation MR safety regulatory science tools MITS-TT specific absorption rate (SAR) |
| url | https://ieeexplore.ieee.org/document/10804130/ |
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