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Abstract #2432

MR Imaging Near Metallic Implants Using Selective Multi-Acquisition with Variable Resonances Image Combination

Chiel J. den Harder1, Ulrike A. Blume1, Clemens Bos2

1MR Advanced Solutions, Philips Healthcare, Best, Netherlands; 2MR Clinical Science, Philips Healthcare, Best, Netherlands

With a substantial part of the population having metal implants, there is a clear need for MR imaging resistant to metal artifacts. SEMAC and MAVRIC have been shown to significantly reduce susceptibility artifacts, at the cost of increased scan time. MAVRIC, especially, has been described as spatially non-selective with clinically unacceptable long scan times depending on anatomy size. This work proposes a spatially selective MAVRIC variant (sMAVRIC) that retains the well-defined spectral selectivity of spectral bins, and enables scan time reduction, without the risk of back-folding. Spatial and spectral selectivity are determined by sequence parameters and independent of implant material.

Keywords

absent acceleration acquisition acquisitions advanced anatomies anatomy applied applying artifact artifacts avoiding axial back bandwidth best bilateral bins blurring cause channel clarity clear clearly clinical clinically coil combination completely consequence coronal corrected cost coverage dataset defined depending described determined differs displayed distortions earlier effective enables encodes entire evaluated evaluating even excitation extends feasible femoral fixation folded folding frequency full geometry gradient gradients harder healthy implant implants implemented in vivo indeed independent indicating induced intended interleaving introduced leads limited long metal metallic near neck need needed next object oblique otherwise part particularly phantom phys pile pixel polarity population profile proposed pulse pulses read readout recent recently reduce reduces reducing reduction reductions refocusing reformats remains reported require resistant resolution retains risk scanned scanner schemes screws selection selective selectivity sense settings significantly similarly slice spatial spatially spectral spine strength strong substantial susceptibility theory tilting titanium traded unacceptable useful variable variation variations view volume volunteer width wrap