Effects of the Magnetic Resonance Field on Breast Tissue Expanders

Nava, Maurizio; Bertoldi, Serena; Forti, Manuela; Catanuto, Giuseppe; Vergnaghi, Daniele; Altomare, Lina; Tanzi, Maria Cristina; Farè, Silvia

doi:10.1007/s00266-012-9908-z

Cited by 19 publications

(35 citation statements)

References 12 publications

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“…The electromagnetic field variations due to the filling condition, i.e., full vs. half-full, were evaluated at 64 MHz using the ASTM phantom [5]. The result shows that the maximum 10g-averaged SAR of the half-full device within the volume of interest was decreased by 36% (15.0 vs. 9.6 W/kg) compared to 10g-averaged SAR of the full volume of the device.…”

Section: Discussionmentioning

confidence: 99%

“…In clinical applications, the size of the device is typically adjusted to the patient’s anatomy. However, two different filling conditions of the device, i.e., full vs. half-full [5], were used to evaluate the electromagnetic field variations at 64 MHz.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, Nava et al [5] have studied the forces generated in four samples by the static magnetic field on the breast tissue expander implant due to the presence of a permanent magnet within the implant body. The study found significant attractive forces (>60° deflection) using a 1.5 T system.…”

Section: Introductionmentioning

confidence: 99%

“…The aforementioned report by Nava et al included a novel measurement of RF heating on breast expander devices using a variant of ASTM test standard. However, the use of an infrared camera limits the volume of evaluation to the surface of the phantom and cannot detect temperature changes deep inside the phantom [5]. In addition, the values of RF-induced heating measured in the ASTM phantom could differ significantly from in vivo conditions due to differences in local RF fields.…”

Section: Introductionmentioning

confidence: 99%

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RF Safety Evaluation of a Breast Tissue Expander Device for MRI: Numerical Simulation and Experiment

Park

Razjouyan

Angelone

et al. 2017

IEEE Trans. Electromagn. Compat.

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This study describes the MRI-related radio frequency (RF) safety evaluation of breast tissue expander devices to establish safety criteria. Numerical simulations and experimental measurements were performed at 64 MHz with a gel phantom containing a breast expander. Additionally, computational modeling was performed (64 and 128 MHz) with an adult female model, containing a virtually implanted breast tissue expander device for four imaging landmark positions. The presence of the breast tissue expander device led to significant alterations in specific absorption rate (SAR) and|B1+|distributions. The main source of SAR alterations with the use of the breast expander device was the saline-filled pouch of the expander. Conversely, the variation of RF magnetic field (B1+) was mainly caused by the metallic port. The measured values of electric field magnitude did not increase significantly due to the introduction of the expander device. The maximum 1g- or 10g-averaged SAR values in tissues near the implant were lower than those expected in other regions of the patient body with normalization of both|B1+|equal to 2 μT at the coil isocenter and whole body averaged SAR equal to 4W/kg.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

RF Safety Evaluation of a Breast Tissue Expander Device for MRI: Numerical Simulation and Experiment

Park

Razjouyan

Angelone

et al. 2017

IEEE Trans. Electromagn. Compat.

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“…However, there may be some artifact on the MRI from the plate. 19,20 While titanium plates have not traditionally been used in breast reconstruction, their use in other specialties has demonstrated their safety. In the case where a patient needs postoperative radiation, radiation can safely be administered with the plate in situ 21 ; however, the radiation-dose distribution is reduced behind the plate.…”

Section: Discussionmentioning

confidence: 99%

The Matrix Rib Plating System

Ahdoot

Echo²,

Otake

et al. 2013

Annals of Plastic Surgery

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The majority of patients (9 of 11) with compromised aesthetic outcomes had a BMI less than 30 kg/m, suggesting a paucity of overlying soft tissue contributed to visibility of these bony defects. Rib plating prevented chest contour deformity, reduced postoperative pain, and added limited additional morbidity. We believe that rib plating is a safe, useful adjunct to microvascular breast reconstruction using IMVs, as it may improve aesthetic outcomes and reduce postoperative pain.

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No Diagnostic Concerns With Cardiovascular Magnetic Resonance Imaging in Patients With Breast Cancer and Breast Implants

Manisty

Barac

Lenihan³

2022

JAMA Cardiol

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To the Editor We welcome the Viewpoint from Oren et al 1 highlighting the importance of ensuring high-quality cardiovascular (CV) imaging for patients living with (or survivors of) breast cancer with breast implants. Patients commonly require functional CV imaging to establish CV safety during or after receiving cancer treatment for screening for cancer treatment-related cardiac dysfunction (CTRCD) in line with available guidelines and consensus statements. 2 Echocardiography has long been known to be challenging in patients with breast implants, 3 and inaccurate imaging risks not only late detection of potentially life-threatening cardiotoxic effects but also inappropriate withholding of cancer treatments. Alternative imaging modalities are therefore commonly required to ensure accurate diagnosis and appropriate clinical decisionmaking. Investigation and monitoring of incident CV toxic effects also requires optimal CV noninvasive imaging, and the spectrum of disease demands a multimodality approach, with false-positive results reported in this patient group with both electrocardiography 4 and nuclear (single-photon emission computed tomography) imaging. 5 The authors state that the diagnostic performance of cardiovascular magnetic resonance imaging (CMR) may be impaired by the presence of breast prostheses. They propose that formal evaluation of the sensitivity and specificity of CMR in patients with breast cancer and implants is required, notably for investigation of immune checkpoint inhibitor-related myocarditis.We strongly refute that suggestion. There is no evidence to suggest that the presence of a breast implant should impact tissue characterization-either for late gadolinium enhancement fibrosis imaging or for parametric mapping for measurement of T1, T2, or T2*. The constituent components of the implants (silicone, saline) are nonferromagnetic and have no impact on relaxometry. Many thousands of patients globally have undergone CMR with breast implants, and there are no published or anecdotal reports of artifacts.The only area where care should be taken with patients with breast cancer undergoing CMR is for patients with some tissue expanders with MAGNA-SITE injection ports, which are labelled as MR-Unsafe. Tissue expanders are temporary devices used prior to breast implantation following mastectomy. All breast implants are labelled as MR-Safe and many new tissue expanders are labelled MR-Conditional.Options for quality diagnostic CV imaging in patients with breast cancer with implants may be limited, and for these specific patients, the impact of not evaluating for CTRCD or other cardiotoxic effects is high. Suggesting that either CMR or computed tomography be inaccurate is not only incorrect but also potentially harmful to patients. On behalf of the cardiooncology community and patients, we would strongly advocate that this Viewpoint article be amended to correct this statement.

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Effects of the Magnetic Resonance Field on Breast Tissue Expanders

Abstract: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266.

Cited by 19 publications

References 12 publications

RF Safety Evaluation of a Breast Tissue Expander Device for MRI: Numerical Simulation and Experiment

RF Safety Evaluation of a Breast Tissue Expander Device for MRI: Numerical Simulation and Experiment

The Matrix Rib Plating System

No Diagnostic Concerns With Cardiovascular Magnetic Resonance Imaging in Patients With Breast Cancer and Breast Implants

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