We discuss the calculation of two-loop helicity amplitudes for quark-quark scattering in QCD and four-gluino scattering in N = 1 supersymmetric Yang-Mills theory. We study the dependence of the results on different variants of dimensional regularization. In particular, we consider the ’t Hooft-Veltman and four-dimensional helicity (FDH) schemes. We also discuss ambiguities in continuing the Dir...

Department of 1. Radiology and 2. Orthopedics, Royal Blackburn Hospital, Blackburn, Lancashire, UK Background: A 28-year-old lady of Asian origin presented with a painful left foot associated with swelling, purulent discharge and surrounding cellulitis. Her temperature was normal and blood results were within normal limits. Her past medical history included pulmonary tuberculosis. The patient h...

The demand for an accurate and accessible image segmentation to generate 3D models from CT scan data has been increasing as such models are required in many areas of orthopedics. In this paper, to find the optimal image segmentation to create a 3D model of the knee CT data, we compared and validated segmentation algorithms based on both objective comparisons and finite element (FE) analysis. Fo...

Four-Dimensional (4D) Trajectory-Based Operations (TBO) is a key component of the Next Generation Air Transportation System (NextGen), integrating an aircraft’s navigation capability in space and time to improve efficiency and predictability in the Air Traffic Management (ATM) system. NextGen envisions that ATM will require the widespread implementation of 4D Trajectories (4DT) in all phases of...

OBJECTIVE To compare how at-risk tissue and core infarction were defined in two major trials that tested the use of MRI in selecting acute stroke patients for endovascular recanalization therapy. METHODS MRIs from 12 patients evaluated for possible endovascular therapy were processed using the methods published from two major trials, MR RESCUE and DEFUSE 2. Specifically, volumes of at-risk ti...

PURPOSE Tracking the progression of low grade tumors (LGTs) is a challenging task, due to their slow growth rate and associated complex internal tumor components, such as heterogeneous enhancement, hemorrhage, and cysts. In this paper, the authors show a semiautomatic method to reliably track the volume of LGTs and the evolution of their internal components in longitudinal MRI scans. METHODS ...

The fluid dynamical properties of the air flow in the upper airway (UA) are not fully understood at present due to the three-dimensional (3D) patient-specific complex geometry of the airway, flow transition from laminar to turbulent and flow-structure interaction during the breathing cycle. It is quite difficult at present to experimentally measure the instantaneous velocity and pressure at spe...

BACKGROUND Fees charged for similar imaging tests often vary dramatically within the same market, leading to wide variation in insurer spending and consumer cost-sharing. Reference pricing is an insurance design that offers good coverage to patients up to a defined contribution limit but requires the patients who select high-priced facilities to pay the remainder out of pocket. OBJECTIVES To ...

The calculation of loop amplitudes with parity violation or spin effects within dimensional regularization needs a consistent definition of γ5. Also loop calculations in supersymmetric theories need a consistent definition of γ5. In this paper we develop a new formalism, which allows us to define consistent regularization schemes. We use Grothendieck’s K-functor to construct finite-dimensional ...

BACKGROUND Three-dimensional printing provides an exciting opportunity to customise upper-limb prostheses. OBJECTIVE This review summarises the research that assesses the efficacy and effectiveness of three-dimensional printed upper-limb prostheses. STUDY DESIGN Systematic review. METHODS PubMed, Web of Science and OVID were systematically searched for studies that reported human trials o...