Hyejoo Kang, PhD

Therapy Physics

Markerless tumor tracking (MTT) using single-energy (SE) kilovoltage (kV) imaging is being considered for lung tumor motion management. However, bone overlap with tumor can reduce visibility and tracking accuracy. Dual-energy (DE) imaging suppresses bone and...

Deep learning models have shown promise for image-quality rating tasks, yet the visual cues they rely on are often difficult to interpret. Grad-CAM and related saliency methods are commonly used to visualize attribution, but these heatmaps often yield unclear...

To assess the effect of virtual monoenergetic image (VMI) energy variation (50-160 keV) on the accuracy of auto-generated contours using commercial autocontouring software.

Eclipse v18 introduces an enhanced leaf model (ELM) for multileaf collimator (MLC) configuration. The model requires dosimetric measurements acquired with MLC-shaped fields and is therefore sensitive to leaf condition. Although leaf cleaning is commonly recom...

Deformable image registration (DIR) is integral to imaging alignment in radiation therapy, yet quality assurance (QA) on DIR performance remains challenging when reference contours are unavailable. In such situations, clinical decisions on acceptance of DIR r...

Osteoarthritis (OA) affects nearly one in four adults worldwide and has become an escalating public health concern. Medical and surgical interventions often carry notable morbidity, cost, and side effects. As a noninvasive alternative, low-dose radiotherapy (...