Takehiro Shiinoki

Learn More
PURPOSE To identify the dosimetric parameters associated with gastrointestinal (GI) toxicity in patients with locally advanced pancreatic cancer (LAPC) treated with gemcitabine-based chemoradiotherapy. METHODS AND MATERIALS The data from 40 patients were analyzed retrospectively. Chemoradiotherapy consisted of conventional fractionated three-dimensional(More)
The aim of this study was to present the technical aspects of the breath-hold technique with respiratory monitoring and visual feedback and to evaluate the feasibility of this system in healthy volunteers. To monitor respiration, the vertical position of the fiducial marker placed on the patient’s abdomen was tracked by a machine vision system with a(More)
PURPOSE To assess the interfractional positional variation of the pancreas using four-dimensional computed tomography (4D-CT) and to determine the suitable phase of respiration for dose delivery methods to account for pancreatic tumor motion. METHODS AND MATERIALS Fifteen patients with pancreatic cancer were enrolled in this study. For each patient, 4D-CT(More)
PURPOSE The Vero4DRT system has the capability for dynamic tumor-tracking (DTT) stereotactic irradiation using a unique gimbaled x-ray head. The purposes of this study were to develop DTT conformal arc irradiation and to estimate its geometric and dosimetric accuracy. METHODS The gimbaled x-ray head, supported on an O-ring gantry, was moved in the pan and(More)
PURPOSE To assess positional reproducibility of pancreatic tumors under end-exhalation (EE) breath-hold (BH) conditions with a visual feedback technique based on computed tomography (CT) images. METHODS AND MATERIALS Ten patients with pancreatic cancer were enrolled in an institutional review board-approved trial. All patients were placed in a supine(More)
The report presented here describes a case of spontaneous pneumothorax observed after stereotactic radiotherapy (SRT) for non-small-cell lung cancer (NSCLC). An 84-year-old man with a Stage IIB, T3N0M0 NSCLC in the right upper lobe and a Stage IA NSCLC in the right lower lobe of the lung was treated with SRT for both tumors. He received SRT with a total(More)
A combined system comprising the TrueBeam linear accelerator and a new real-time, tumor-tracking radiotherapy system, SyncTraX, was installed in our institution. The goals of this study were to assess the capability of SyncTraX in measuring the position of a fiducial marker using color fluoroscopic images, and to evaluate the dosimetric and geometric(More)
PURPOSE This study aims to evaluate the interfractional dose variations in the organs-at-risk (OARs) during pancreatic breathhold intensity-modulated radiotherapy (IMRT) and to assess the impacts of "planning organs-at-risk volume" (POV) structures generated by isotropically expanding the dose-limiting OARs, based on the comparison of the interfractional(More)
PURPOSE The respirato ry gating system combined the TrueBeam and a new real-time tumor-tracking radiotherapy system (RTRT) was installed. The RTRT system consists of two x-ray tubes and color image intensifiers. Using fluoroscopic images, the fiducial marker which was implanted near the tumor was tracked and was used as the internal surrogate for(More)
BACKGROUND AND PURPOSE To report the clinical usefulness of coiled fiducial markers as an internal surrogate in gated stereotactic body radiotherapy (SBRT) for hepatocellular carcinoma (HCC) using a real-time tumor-tracking radiotherapy (RTRT) system. MATERIALS AND METHODS Seventeen HCC patients with Child-Pugh (CP) scores of A or B received gated SBRT(More)