Dae Hyeon Kim RESEARCH 한국어

Focused-ultrasound registration and control

Registered imaging and tracking coordinates and implemented position control for focused-ultrasound field measurement.

GitHub: ultrasound_brain_tumor_project
Role
3D Slicer module and device-control developer
Contribution
Implemented coordinate registration, real-time slice updates, VXM stage control, waveform acquisition and module packaging.
Period & affiliation
2021.01 ~ 2021.02 KIST Bionics Research Center

01 / RESEARCH DETAILCoordinate registration and real-time image slices

Challenge
CT/MRI volumes, tracking devices and probes use different coordinate systems.
Approach
Connected Reference and RAS coordinates through landmark and surface registration and propagated probe transforms to image slices in real time.
Contribution
Developed Python modules for 3D Slicer, integrated devices and packaged the prototype with preclinical researchers.
Registration of image RAS and tracking coordinates
Registration of image RAS and tracking coordinates
View full-size figure
Real-time MRI slice updates with UpdateSlicePlane
Real-time MRI slice updates with UpdateSlicePlane
View full-size figure
Tracking and acoustic-field measurement equipment
Tracking and acoustic-field measurement equipment
View full-size figure
Registration and tracking functions
Module Operation
Coordinate transform ReferenceToRAS × TipToReference
Slice update Update Red / Green / Yellow slice positions
Modules Registration, tracking, stage control, acquisition
Evaluation conditions and scopeImage guidance and device control in the KIST research prototype.

02 / RESEARCH DETAILStage movement, waveform acquisition and field maps

Challenge
Stage movements accumulate waiting time, and each waveform must remain associated with its measurement location.
Approach
Adjusted VXM movement intervals and waiting times and generated plane-wise field maps from grid measurements.
Contribution
Connected robotic movement, waveform acquisition and field visualization within 3D Slicer.
Movement comparison after adjusting step size and waiting time
Movement comparison after adjusting step size and waiting time
View full-size figure
Waveform acquisition linked to its measurement coordinates
Waveform acquisition linked to its measurement coordinates
View full-size figure
Measurement positions on a 7 × 7 × 7 grid
Measurement positions on a 7 × 7 × 7 grid
View full-size figure
2D map of acquired acoustic-field values
2D map of acquired acoustic-field values
View full-size figure
Calculated movement waiting time
Original timing comparison Calculated time
Before 0.7 × 21 = 14.7 s
After adjustment 0.7 + 0.3 × 8 + 1.3 = 4.4 s
Speed ratio Approximately 3.3×
Evaluation conditions and scopeCalculated movement waiting time: 14.7 to 4.4 seconds, approximately 3.3 times faster.