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Abstract #1673

Evaluating Transverse Relaxation Trends in Cobalt-Chromium Particulate Deposits

Kevin Koch1, Matthew F. Koff2, Parina Shah2, Hollis Potter2

1GE Healthcare, Milwaukee, WI, United States; 2Department of Radiology and Imaging, Hospital for Special Surgery, New York, United States

The introduction of metal artifact suppression sequences has elicited further demands from magnetic resonance techniques in assessing tissue near failed joint replacements. Many of these failure cases require confirmation of the presence or absence of implant particulate debris. Here, we speculate that the high-susceptibility nature of some particulate matter could impact transverse relaxation-based contrast in MR images. A phantom study is used to confirm this hypothesis. The capability of exploiting these observed trends using metal-artifact suppression techniques is then explored.

Keywords

ability acquisition acquisitions advantageous adverse alloy analytic arrow assembly assess assumed attributed blue bone carefully characteristics chromium classes clear clinical clinically cobalt component composed concentration confidence contained contrast crudely date debris demonstrating densities density dependence deposit deposits determined developments differentiate differentiating differentiation dimensions distortions distribution domain dynamics effective encountered encouraging even exact examining exploited exponential feasible fits function general generating geometry gradient guiding help heterogeneity highly hypothesized identify implants in vivo initial intervals intricate investigated investigation investigations involves irreversible lends limited local loss magnitude majority measured mechanisms metal metallic microscopic models nature near need needs negligible north objective observations particles particulate phantom pixel placed plate plates plotted possibility postulation potter presence previously problem protons quantify quantifying reactions refocused relevance relevant render replacements require response roughly sample shah simple slices soft special spin stacked strong substantial support surgery surrounding susceptibility temporal tempting tissue transverse trend undertaken unfortunately utilized variable variations variety varying volume wear