Rigid-Body Tracking, Independent Component Analysis & Pediatric Noise Robustness
Moving from pure simulation to real-world patient instrumentation.
Cardiac: $1 - 2.5\,\text{Hz}$ in neonates; pulsatile vessel motion and Doppler shifts.
Respiratory: $0.3 - 0.7\,\text{Hz}$; bulk chest movement causes chest-induced $\Delta B_0$ drift.
Rigid Movement: Induces k-space phase ramps and ghosting.
Optode Slippage: Sudden shear contact shifts create high-amplitude baseline steps.
• $60\,\text{Hz}$ AC powerline noise.
• NICU radiant heater switching harmonics.
• Intense blue bilirubin phototherapy light.
Modeling movement in 3D Euclidean space and its Fourier consequences.
Optical cameras or navigator echoes track $\mathbf{R}$ and $\vec{T}$ at $> 50\,\text{Hz}$.
Dynamically updates RF center frequency and gradient axes before readout, keeping the imaging slice locked onto anatomy in real time.
Wavelet packet filtering and cubic spline reconstruction strip sudden spikes in continuous optical time series without blurring underlying hemodynamics.
General anesthesia and deep sedation pose severe neurotoxic risks in neonates.
Sensors and sequences must be 100% motion-tolerant by design rather than relying on chemical immobility.
Rigid caps slip when infants move their heads against incubator mattresses.
Conformal silicone-embedded hydrogel arrays distribute pressure evenly ($< 15\,\text{mmHg}$) and resist shear motion.
In fontanelle ultrasound, pulsatile vessel wall movement ($1 - 5\,\text{mm/s}$) swamps slow capillary blood flow ($< 0.5\,\text{mm/s}$).
Spatiotemporal SVD filtering strips high-energy low-rank tissue wall clutter cleanly.
Next: Lab Tour: Neuroengineering EEG Core & Electrophysiology