Publications by authors named "S Christinajoice Saminathan"
Article Synopsis
- This study focuses on validating beam data from three beam-matched linear accelerators (LAs) for accurate radiation delivery in fractionated stereotactic treatment, comparing measured data to vendor reference data.
- Measurements included percentage depth dose, beam profiles, output factors, and dynamic multi-leaf collimator factors for different photon types, achieving high accuracy with gamma analysis above 97%.
- Quality assurance for eighty patient-specific plans showed median passing rates of over 76% to 98% across various gamma criteria, indicating compatibility of treatment across the beam-matched LAs without the need for re-planning.
We report direct measurements of the magnetic field screening at the limits of the Meissner phase for two superconducting niobium (Nb) samples. The samples are processed with two different surface treatments that have been developed for superconducting radio-frequency (SRF) cavity applications-a "baseline" treatment and an oxygen-doping ("O-doping") treatment. The measurements show: (1) that the screening length is significantly longer in the "O-doping" sample compared to the "baseline" sample; (2) that the screening length near the limits of the Meissner phase increases with applied field; (3) the evolution of the screening profile as the material transitions from the Meissner phase to the mixed phase; and (4) a demonstration of the absence of any screening profile for the highest applied field, indicative of the full flux entering the sample.
View Article and Find Full Text PDFA better understanding of the long-term safety, efficacy, and immunogenicity of COVID-19 vaccines is needed. This phase 3, randomized, placebo-controlled study for AZD1222 (ChAdOx1 nCoV-19) primary-series vaccination enrolled 32,450 participants in the USA, Chile, and Peru between August 2020 and January 2021 (NCT04516746). Endpoints included the 2-year follow-up assessment of safety, efficacy, and immunogenicity.
View Article and Find Full Text PDFAim: This study aims to validate the Razor Nano Chamber (RNC) and Razor Chamber (RC) dosimetric characteristics in a small field. The dosimetric parameters of the two chambers were compared.
Materials And Methods: The chamber characteristics of leakage (pre and post), stability, energy dependency, dose linearity, dose rate effect, stem effect, angular dependency, ion recombination effect, and polarity effect were studied.
Study Design: Retrospective study.
Purpose: To compare and correlate technetium-99m methylene diphosphonate uptake between benign and metastatic bone lesions using semiquantitative analysis of maximum standard uptake value (SUVmax) and mean Hounsfield unit (HU) in single-photon emission computed tomography-computed tomography (SPECT-CT).
Overview Of Literature: Qualitative interpretation of metastatic bone lesions in breast cancer on bone scintigraphy is often complicated by coexisting benign lesions.