In the past few years, there has been an increasing interest of the radiation oncology community in cone-beam computed tomography (CT) scanners integrated into the gantry of medical linear accelerators. This imaging device allows to acquire CT images of the patient in treatment position. Unfortunately, like for other CT scanners, the respiratory motion of the patient during acquisition causes a...

We proposed a simple visual method for evaluating the dynamic tumor tracking (DTT) accuracy of a gimbal mechanism using a light field. A single photon beam was set with a field size of 30 × 30 mm2 at a gantry angle of 90°. The center of a cube phantom was set up at the isocenter of a motion table, and 4D modeling was performed based on the tumor and infrared (IR) marker motion. After 4D modelin...

We are developing an innovative dynamic tumor tracking irradiation technique using gold markers implanted around a tumor as a surrogate signal, a real-time marker detection system, and a gimbaled X-ray head in the Vero4DRT. The gold markers implanted in a normal organ will produce uncertainty in the dose calculation during treatment planning because the photon mass attenuation coefficient of a ...

The dynamic nature of IMRT delivery poses unique problems relating to the accurate and reproducible quality assurance of dose delivery. The usefulness of point detectors is limited to static fields and regions within low dose-gradients for treatment verification. However, dose distributions generated in intensity modulated radiation therapy (IMRT) often have complex shapes with high dose gradie...

Introduction: Transcatheter arterial embolization (TAE) and chemoembolization (TACE) are established treatment methods for unresectable liver tumor. TRanscatheter Intraarterial Perfusion (TRIP)-MRI is an intra-procedural technique to monitor liver tumor perfusion changes during TAE [1] and TACE [2]. However, previous developed TRIP-MRI approaches either used semi-quantitative perfusion analyses...