Abstract
Purpose
To evaluate the advantages of using an active marker (active micro coil) for MRβguided breast biopsy procedures.
Materials and Methods
An addβon breast biopsy guidance device used with a standard breast coil was equipped with an active marker. The marker's position was determined with a dedicated MRI sequence. In combination with custom software, the biopsy planning process was reduced basically to defining the target in the diagnostic MR images. Automatic control scans verified the settings of the biopsy guidance device. To measure the targeting accuracy, xβray control of the needle placement was performed in phantoms containing 36 small titanium cylinders. The reliability of the procedure was evaluated in 24 core needle biopsies on phantoms. Workflow enhancements were analyzed.
Results
The root mean square deviation of the needle position from the target perpendicular to the needle axis was 1.25 mm, in threeβdimensions it was 1.35 mm. All targets were sampled successfully. The duration of a phantom biopsy was nine minutes.
Conclusion
The use of an active marker can offer advantages for MRβguided breast biopsies in terms of handling and procedure time as well as accuracy. J. Magn. Reson. Imaging 2006. Β© 2006 WileyβLiss, Inc.