https://bughht.github.io/tags/gordon/Recent content in Gordon on Bughht BlogHugozh-CNhhong6@mgh.harvard.edu (Haotian Hong)hhong6@mgh.harvard.edu (Haotian Hong)Thu, 09 Jul 2026 15:09:46 +0800https://bughht.github.io/intern_mgh/gordon_conference_acdc_showcases/Thu, 09 Jul 2026 15:09:46 +0800hhong6@mgh.harvard.edu (Haotian Hong)https://bughht.github.io/intern_mgh/gordon_conference_acdc_showcases/<h1 id="acdc-dynamic-b0-field-control-additional-showcase">ACDC Dynamic B0 Field Control: Additional Showcase</h1> <p><strong>Related Repositories:</strong></p> <ul> <li><a href="https://github.com/bughht/ACDC_Optim"target="_blank" rel="external nofollow noopener noreferrer">bughht/ACDC_Optim</a> — Shim waveform optimization solvers</li> <li><a href="https://github.com/bughht/concomitant_sim"target="_blank" rel="external nofollow noopener noreferrer">bughht/concomitant_sim</a> — Concomitant field simulation toolkit</li> </ul> <hr> <h2 id="1-short-term-eddy-current-compensation-correcting-epi-edge-ghosts">1. Short-Term Eddy Current Compensation: Correcting EPI Edge Ghosts</h2> <h3 id="the-problem">The Problem</h3> <p>In single-shot EPI, rapidly switching gradient waveforms induce <strong>short-term eddy currents</strong> (decay $\tau \sim 1$–$10$ ms) in the cryostat and surrounding conductors. These eddy currents create a time-varying gradient bias during the EPI readout train that manifests as <strong>Edge ghosts</strong> superimposed on the primary image.</p>