Artifact-Reduced Imaging of Biopsy Needles with 2D Multispectral Imaging

We have validated the use of an MR imaging method that reduces the image artifacts due to metal objects for tracking biopsy needles in MR-guided procedures. Metal objects induce off-resonance, which creates image artifacts such as signal loss and distortion near the object in conventional MRI. 2D multispectral imaging is a fast technique that subdivides the off-resonance into different regions (“bins”), images each of these bins separately, and then combines the separate images to form the final image. Imaging in this way minimizes the artifacts and allows for better visualization of the tissue near the metal object, as well as the metal object itself. In this case, 2D multispectral imaging may enable imaging of needles made of materials that currently cannot be usefully imaged but have sharper cutting edges, which is desirable.

Weber H, Hargreaves BA, Daniel BL. Artifact-reduced imaging of biopsy needles with 2D multispectral imaging. Magn Reson Med. 2017 Dec 29. doi: 10.1002/mrm.27056.

Online Journal Article

First row: 2D multispectral imaging (right column) shows significantly reduced artifacts for a conventional MR-compatible biopsy needle. Second row: 2D multispectral imaging again shows reduced artifacts for a non-MR-compatible biopsy needle, although the artifacts are still too severe for useful imaging. Third row: 2D multispectral imaging shows reduced artifacts for a biopsy needle that combines conventionally MR-compatible and non-MR-compatible materials, which may enable the use of biopsy needles that have sharper cutting edges in MR-guided biopsy procedures.

Professor of Radiology (Radiological Sciences Laboratory) and, by courtesy, of Electrical Engineering
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Professor of Radiology (General Radiology)

Hans Weber is an alumnus of the BMR group