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Dr. Chang's research interests include radiation therapy treatment assessment using MR quantitative imaging, image guided radiation therapy (IGRT), fast MR imaging using parallel imaging and strategic phase encoding, and motion management for IGRT.
Figs. 4 and 5 provide good examples to illustrate that motion management for PET/CT must consider both imaging modalities and their interaction.
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Figure 5 Examples of motion management strategies for two patients receiving PET/CT-guided radiotherapy.
Four-dimensional (4D) cone-beam computed tomography (CBCT) of the lung is an effective tool for motion management in radiotherapy but presents a challenge because of slow gantry rotation times.
Figure 3 Example workflow of patient-specific motion management and PET/CT guidance for lung cancer radiotherapy.
He is currently working as a senior research associate, with research focused on algorithms and technologies for motion management in radiation therapy and related fields, teaching classes in robotics and artificial intelligence.
Several methods for motion management dedicated to MRgHIFU in the upper abdomen have been investigated.
A common limitation of the current strategies for motion management is that they assume a constant, reproducible respiratory cycle.
An overview of motion management strategies is given here; for further details, please refer to the American Association of Physicists in Medicine Task Group 76 report[41].
After 2 and 5 fractions, patients were classified into small- and large-motion groups with ~77% and ~83% accuracy.Adaptive strategies are feasible and beneficial for intrafraction motion management in prostate cancer online image guidance.
Nevertheless, these early results indicate that rapid MRI offers a highly attractive, noninvasive imaging tool for respiratory motion management.
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