Direct-to-Unit (simulation-omitted) radiotherapy enables treatment planning directly from diagnostic imaging, eliminating CT simulation and supporting same-day treatment for time-sensitive cases. These workflows rely on adaptive radiotherapy (ART) platforms t...
Author profile
Justin D. Visak, PhD
Department of Radiation Oncology, UT Southwestern Medical Center
The increasing adoption of MRI-guided online adaptive radiotherapy (oART) has improved treatment personalization but introduced substantial technical complexity and time pressure. Existing QA approaches remain largely manual and retrospective, with limited ab...
One major bottleneck in MRI-guided online adaptive radiotherapy is the prolonged treatment process, particularly extended delivery times, partly due to the relatively low dose rate and high prescription doses. Efficient radiation delivery is essential for mai...
Magnetic resonance imaging-guided online adaptive radiotherapy (MRgRT) requires a complex planning process, during which an upstream peer review prior to physician approval plays an essential role in early error detection and supporting safe and efficient onl...
To compare MR-simulation motion emulation with measured respiratory gating performance for ultra-central lung treatments on 1.5T MR-linac and to identify the dominant factors affecting gating efficiency. The study focuses on the role of tracking surrogate sel...
To develop and validate consensus electron density (ED) look-up tables (LUTs) for MR-only radiotherapy planning through multi-institutional collaboration.
Lattice stereotactic body radiation therapy (Lattice SBRT) delivers spatially fractionated high-dose vertices embedded within a lower-dose tumor base, producing steep dose gradients potentially sensitive to interfractional anatomical change. This study evalua...
Direct-to-treatment radiotherapy eliminates CT simulation and pre-planning, reduces consultation-to-treatment intervals from weeks to hours. This study evaluated the feasibility of an ultra-hypofractionated whole-breast workflow that omits simulation and adva...
Direct-to-unit (DTU) radiotherapy, which bypasses CT simulation and prospective planning, offers an opportunity to markedly shorten the interval from consultation to treatment and expand access to timely breast cancer care. Building on prior feasibility work,...