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Background: Recently, the popularity of dual-layer flat-panel detector (DL-FPD) based dual-energy cone-beam CT (DE-CBCT) imaging has been increasing. However, the image quality of DE-CBCT remains constrained by the Compton scattered X-ray…

This study develops and validates a patient-specific Monte Carlo (MC) dosimetry framework for propagation-based phase-contrast breast CT (BCT) at the Imaging and Medical Beamline (IMBL), ANSTO Australian Synchrotron, for accurate mean…

Purpose: Commercial UHDR platforms deliver Ultra-High Dose Rate (UHDR) doses at discrete combinations of pulse parameters including pulse width (PW), pulse repetition frequency (PRF) and number of pulses (N), which dictate unique…

Purpose: To develop a Monte Carlo (MC) therapeutic dose calculation toolkit of a recently released ring gantry linac in Geant4 (Version 10.7) for secondary dose validation of radiotherapy plan. Methods: For the Halcyon (Varian Medical…

Medical Physics · Physics 2022-10-04 Ruirui Liu , Zhen Ji , Xiandong Zhao , Tianyu Zhao , Abhishek Sethi , Daren Sawkey , Bin Cai

W-CDF-S, ELAIS-S1, and XMM-LSS will be three Deep-Drilling Fields (DDFs) of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), but their extensive multi-wavelength data have not been fully utilized as done in the COSMOS…

Coherent transition radiation (CTR) from relativistic electron beam interaction with an overdense plasma foil is investigated by making use of two-dimensional particle-in-cell simulations. Well-defined single electron beam either of uniform…

Plasma Physics · Physics 2019-02-14 W. J. Ding , F. Y. Li , S. M. Weng , P. Bai , Z. M. Sheng

Photo-induced reaction cross section data are of importance for a variety of current or emerging applications, such as radiation shielding design and radiation transport analyses, calculations of absorbed dose in the human body during…

A novel phase-space source implementation has been designed for GPU-based Monte Carlo dose calculation engines. Due to the parallelized nature of GPU hardware, it is essential to simultaneously transport particles of the same type and…

Medical Physics · Physics 2013-06-21 Reid Townson , Xun Jia , Zhen Tian , Yan Jiang Graves , Sergei Zavgorodni , Steve B Jiang

We present an update to the EVEREST K2 pipeline that addresses various limitations in the previous version and improves the photometric precision of the de-trended light curves. We develop a fast regularization scheme for third order pixel…

Instrumentation and Methods for Astrophysics · Physics 2018-08-29 Rodrigo Luger , Ethan Kruse , Daniel Foreman-Mackey , Eric Agol , Nicholas Saunders

The emission of very-high-energy photons (VHE, E>100 GeV$) in blazars is closely connected to the production of ultra-relativistic particles and the role of these gamma-ray sources as cosmic particle accelerators. This work focuses on a…

High Energy Astrophysical Phenomena · Physics 2022-03-04 M. Nievas Rosillo , A. Domínguez , G. Chiaro , G. La Mura , A. Brill , V. S. Paliya

We present the X-ray point-source catalog produced from the Chandra Advanced CCD Imaging Spectrometer (ACIS-I) observations of the combined \sim3.2 deg2 DEEP2 (XDEEP2) survey fields, which consist of four ~0.7-1.1 deg2 fields. The combined…

High Energy Astrophysical Phenomena · Physics 2015-06-05 A. D. Goulding , W. R. Forman , R. C. Hickox , C. Jones , R. Kraft , S. S. Murray , A. Vikhlinin , A. L. Coil , M. C. Cooper , M. Davis , J. A. Newman

Precise subtraction of foreground sources is crucial for detecting and estimating 21cm HI signals from the Epoch of Reionization (EoR). We quantify how imperfect point source subtraction due to limitations of the measurement dataset yields…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-11 Cathryn M. Trott , Randall B. Wayth , Steven J. Tingay

This study investigates the convergence properties of a collection of iterative electron ptychography methods, under low electron doses ($<$ 10$^3$ $e^-/A^2$) and gives particular attention to the impact of the user-defined update…

We present a routinized and reliable method to obtain source catalogs from the $\textit{Nuclear Spectroscopic Telescope Array}$ ($\textit{NuSTAR}$) extragalactic surveys of the Extended $\textit{Chandra}$ Deep Field-South (E-CDF-S) and…

Astrophysics of Galaxies · Physics 2023-08-29 Tianyi Zhang , Yongquan Xue

The HEGRA-IACT-system with a FoV of ~1.5 deg radius has been used for surveying one quater of the Galactic disc in respect to point sources, moderately extended sources and for diffuse emission in the energy range above 1 TeV. In total 140…

Radiation therapy with protons as of today utilizes information from x-ray CT in order to estimate the proton stopping power of the traversed tissue in a patient. The conversion from x-ray attenuation to proton stopping power in tissue…

Purpose: A Monte Carlo (MC) beam model and its implementation in a clinical treatment planning system (TPS, Varian Eclipse) are presented for a modified ultra-high dose-rate electron FLASH radiotherapy (eFLASH-RT) LINAC. Methods: The gantry…

The spectral energy distribution of blazars around the synchrotron peak can be well described by the log-parabolic model that has three parameters: peak energy ($E_\textrm{p}$), peak luminosity ($L_\textrm{p}$) and the curvature parameter…

Astrophysics of Galaxies · Physics 2019-11-06 Yijun Wang , Shifu Zhu , Yongquan Xue , Minfeng Gu , Shanshan Weng , Huynh Anh N. Le

We present a new method for probing the thermal electron content of the Galaxy by spectral analysis of background point sources in the absorption-only limit to the radiative transfer equation. In this limit, calculating the spectral index,…

High Energy Astrophysical Phenomena · Physics 2016-05-25 D. I. Jones , A. P. Igoshev , M. Haverkorn
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