Background: Prediction of the absorbed dose in irradiated volume plays an important role in the outcome of radiotherapy. Application of small fields for radiotherapy of thorax makes the dose calculation process inaccurate due to the existence of electronic disequilibrium and intrinsic deficiencies in dose calculation algorithms. To study the lung absorbed dose in radiotherapy with smal...

Combining the capabilities of gate-defined quantum transport devices in $\mathrm{Ga}\mathrm{As}$-based heterostructures and optically addressed self-assembled dots could open up broad perspectives technologies. For example, interfacing stationary solid-state qubits with photonic states would a pathway towards realization network extended processing capacity each node. While gated allow very fle...

We implented a lesion segmentation toolkit with a focus on segmenting solid and part-solid lesions from lung CT. The algorithm constructs four three-dimensional features to detect the lung wall, vessels, soft and diffuse tissue and edges. These features form boundaries and propagation zones that guide the evolution of a subsequent shape detection level set. User input is used to determine an in...

The purpose is to devise a patient-specific quality assurance procedure for RapidArc radiotherapy using the MapCHECK detector array. We use our existing MapCHECK system and a Solid Water phantom with an embedded ion chamber to develop a quality assurance procedure for RapidArc treatment after commissioning. The ion chamber used to measure the absolute dose is surrounded by 6 cm layers of solid ...

The crystal structure of solid-state materials with unique lattices is considered one the main factors determining physical properties, including superconductivity. Materials honeycomb have inspired intense research interest for their novel properties. A previously unknown compound, ${\mathrm{Ta}}_{4}\mathrm{CoSi}$, discussed herein, along its and superconducting It crystallizes in a $\mathrm{C...

Traditionally, total skin electron patients remove all clothing for treatment. It is generally assumed that this is best for the treatment of superficial skin lesions out of concern clothing may significantly perturb dose. We investigate the dosimetric effect of patient gowns and determine the necessity of treating patients naked. Using GAFCHROMIC EBT2 film, dose to a cylindrical phantom was me...

PURPOSE We investigated the feasibility of proton tomosynthesis as daily positioning of patients and compared the results with photon tomosynthesis as an alternative to conventional portal imaging or on-board cone-beam computed tomography. METHODS Dedicated photon-like proton beam using the passively scattered proton beams by the cyclotron was generated for proton imaging. The eleven projecti...

BACKGROUND In this study, dosimetric aspects of TSEI consisting of a 4 MeV beam with no spoiler were investigated in comparison to a nominal 6 MeV beam with spoiler, and the potential for clinical applications was evaluated. METHODS The TSEI technique is based on the Stanford technique, which utilizes a beam configuration of six-dual fields. MOSFETs were used to measure the optimal gantry ang...

UNLABELLED It has been long recognized that the primary advantage of imaging the brain with a positron emission tomography using GSO scintillation detectors placed on a spheroid surface is the large solid angle of acceptance for annihilation radiation, which results in improved system sensitivity and image signal-to-noise ratio. In the present study, we investigated spheroid system geometry, de...