A method for extracting intersection-free iso-surfaces from volumetric data with an octree structure is presented. Unlike contouring techniques designed for uniform grids (such as Marching Cubes), adaptive contouring methods (such as Dual Contouring) can and do often generate intersecting polygons. Our main contribution is a polygon generation algorithm that produces triangles enclosed in nonov...

Target volume delineation is a critical, but time-consuming step in the creation of radiation therapy plans used in the treatment of many types of cancer. However, variability in target volume definitions can introduce substantial differences in resulting doses to tumors and critical structures. We developed TaCTICS, a web-based educational training software application targeted towards non-exp...

BACKGROUND Metallic reconstruction plates used for fracture stabilization typically require intraoperative contouring for patient-specific anatomical fit. Despite this, characterization of plate mechanical properties after contouring has previously been limited. The objective of this study was to assess whether contouring affects fatigue resistance for three types of Stryker seven-hole stainles...

BACKGROUND MRI sequences with short scanning times may improve accessibility of image guided adaptive brachytherapy (IGABT) of cervix cancer. We assessed the value of 3D MRI for contouring by comparing it to 2D multi-planar MRI. PATIENTS AND METHODS In 14 patients, 2D and 3D pelvic MRI were obtained at IGABT. High risk clinical target volume (HR CTV) was delineated by 2 experienced radiation ...

Recently, feedforward controllers like zero phase error tracking controllers (ZPETC’s) and cross-coupled controllers (CCC’s) have been developed to effectively reduce tracking error and contouring error, respectively. This paper proposes an integrated controller which combines ZPETC and CCC to achieve both tracking and contouring accuracy. Furthermore, studies indicate that ZPETC and CCC can be...

Background: To reduce uncertainties of patient positioning, the Computerized Tomography (CT) images acquired at the treatment planning time can be compared with those images obtained during radiation dose delivery. This can be followed during dose delivery procedure as Image Guided radiotherapy (IGRT) to verify the prescribed radiation dose delivery to the target as well as to monitor ...

As one of the powder bed fusion additive manufacturing technologies, electron beam melting (EBM) is gaining more and more attention due to its near-net-shape production capacity with low residual stress and good mechanical properties. These characteristics also allow EBM built parts to be used as produced without post-processing. However, the as-built rough surface introduces a detrimental infl...

This paper presents an overview of the second edition HEad and neCK TumOR (HECKTOR) challenge, organized as a satellite event 24th International Conference on Medical Image Computing Computer Assisted Intervention (MICCAI) 2021. The challenge is composed three tasks related to automatic analysis PET/CT images for patients with Head Neck cancer (H&N), focusing oropharynx region. Task 1 segmentat...

The demand for body contouring is increasing rapidly and has generated the need for a variety of non-invasive body contouring devices. This review concentrates on three popular "hands-free" body contouring devices and analyzes their mechanism of action, as well as their evidence of safety and ef cacy. It also addresses some issues of usability from both the operators' and patients' point of vie...