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Latest Results

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Latest articles

Optimal strategy for measuring intraventricular temperature using acceleration motion compensation diffusion-weighted imaging

Abstract DWI thermometry is affected by CSF pulsation. To achieve more accurate determination of intraventricular temperature, we compared conventional DWI (c-DWI), acceleration motion compensation DWI (aMC-DWI), and motion compensation DWI (MC-DWI) when using two different b values (commonly used b value [1000 s/mm2] and theoretically...

Evaluation of target volume margins for radiotherapy of prostate implanted with fiducial markers

Abstract The planning target volume (PTV) depends on the method of radiotherapy guidance. This study aimed to measure the systemic and random errors using an online marker matching and offline bone structure matching to estimate PTVmarker, PTVbone, or PTVlaser for treatment verification and radiotherapy guidance, especially in centers...

Similar-cases-based planning approaches with beam angle optimizations using water equivalent path length for lung stereotactic body radiation therapy

Abstract This study aimed to propose automated treatment planning approaches based on similar cases with beam angle optimizations using water equivalent path length (WEPL) to avoid lung and rib doses for lung stereotactic body radiation therapy (SBRT). Similar cases to an objective case were defined as cases, which were close to the...

End-to-end test to evaluate the comprehensive geometric accuracy of a proton rotating gantry using a cone-shaped scintillator screen detector

Abstract In this study, we aim to evaluate the comprehensive geometric accuracy of proton rotating gantries by performing an end-to-end test using a cone-shaped scintillator screen detector, known as XRV-124. The XRV-124 comprises a cone-shaped sheet-like scintillator and charge-coupled device camera that detects the scintillation...

Wedged field using the half-field method with a flattening filter-free photon beam

Abstract In this study, we propose a novel wedged field using a half-field flattening filter-free beam without a metallic filter or a moving jaw, and investigate the characteristics of the proposed technique. Dose distributions of the proposed method were first determined in virtual-water or anthropomorphic phantom using a radiotherapy...

Radiotherapy planning techniques to reduce lung irradiation in head and neck cancer patients with mediastinal involvement

Abstract The number of patients with head and neck squamous cell carcinoma (HNC) with mediastinal involvement is small, and appropriate treatment techniques have not been widely discussed. This study aimed to compare the efficacy of radiotherapy planning techniques in reducing lung irradiation while retaining target coverage. Among...

Performance of a linear accelerator couch positioning quality control task using an electronic portal imaging device

Abstract Short and semi-automated quality assurance (QA) programs are becoming one of the most popular and highly demanding tasks in radiotherapy. The current research investigates the accuracy of a four degrees of freedom (4DoF) medical linear accelerator couch positioning with a fast and accurate method based on images acquired...

Evaluation of computed tomography arterial portography scan timing using different bolus tracking methods

Abstract Computed tomography arterial portography (CTAP) is widely used with a fixed scan timing and contrast medium quantity; however, these parameters are not necessarily optimal. In this study, CTAP scan timing was analyzed by different bolus tracking methods to monitor the inflow of the contrast medium in real-time. A total...

Development of a computer simulation technique for low-dose chest radiographs: a phantom study

Abstract The present study aimed to develop a simple computer simulation method of low-dose radiographs based on a radiograph acquired at a clinical-dose level. A chest phantom was used for the development of this method. In this method, a simulated low-dose image was obtained from a clinical-dose image using an input–output characteristic...

Long-term stability of a three-dimensional dose verification system

Abstract Recently, the number of patients undergoing intensity-modulated radiation therapy and volumetric modulated arc therapy has increased with the expansion of the adaptation site. However, it is necessary to improve the efficiency of time-consuming dose verification. Therefore, patient-specific quality assurance is expected...

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