Second look ultrasound and tomosynthesis for high risk patients undergoing MRI screening with implants embedded with RFID markers.

Congress:

ECR 2018

Poster Number:

C-0118

Type:

Scientific Exhibit

Keywords:

Breast, Abdomen, Oncology, MR, Mammography, Ultrasound, Diagnostic procedure, Screening, Dosimetry, Cancer, Dosimetric comparison, Radiotherapy techniques

Authors:

J. C. Benson¹, K. Brattain², J. Williams², P. Bolan¹, M. Nelson¹; ¹Minneapolis, MN/US, ²Minneapolis/US

DOI:

10.1594/ecr2018/C-0118

DOI-Link:

https://dx.doi.org/10.1594/ecr2018/C-0118

Fig. 1: Example of artifact related to RFID. Multiple sagittal non-fat-suppressed T1W...

Fig. 2: Example of signal void related to RFID in a phantom breast implant. Short axis...

Fig. 3: Ultrasound of a phantom breast implant containing an RFID marker demonstrates...

Aims and objectives

Some breast implants used for cosmetic and post-reconstruction surgery now contain radiofrequency identification (RFID) chips. These chips can be used to provide information about the implanted object, and can be read using a RFID reader positioned nearby. A recent study of the use of RFID chips found them to be a safe and effective method in the wireless localization of breast lesions.1Becauasethese clips will likely become increasingly common in breast radiology,it is important for diagnostic radiologists to become familiar breast screening difficulties posed by these...

Methods and materials

Gel phantoms of Motiva (E-labs, Costa Rica) breast implants containing RFID markers (Giessel Medical, Minneapolis, MN USA) were used for this study. The phantom containing the breast implant was imaged using a 1.5T Siemens (Erlangen, Germany). Subsequently, the area affected by the void MR artifact was imaged using both 8-13 MHz sonography (Phillips 200) and tomosynthesis (Hologic, Danbury, CT).

Results

MR imaging of the phantom demonstrated a significant (up to 1.8 cm) signal void/artifact, predominantly located posterior to the location of the known RFID chip within the breast implant. Evaluation of the phantom tissue within the affected region was significantly limited. Subsequent ultrasound and tomosynthesis imaging of the affected area was successful in delineating the nearby tissue without significant artifact.

Conclusion

MR evaluation of breast implants containing RFID chips is significantly limited by metallic artifact causing signal void in the adjacent tissue. This region can be successfully evaluated through a multi-modality approach, using tomosynthesis and/or sonography. Future research may be useful to determine if the use of ferromagnetic clips in breast implants leads to decreased diagnostic accuracy of screening MRI.

Personal information

References

[1] Dauphine C, Reicher JJ, Reicher MA, Gondusky C, Khalkhai I, Kim M. A prospective clinical study to evaluate the safety and performance of wireless localization of nonpalpable breast lesions using radiofrequency identification technology.