Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Analytical, Diagnostic and Therapeutic Techniques and Equipment (4)
- Investigative Techniques (4)
- Physical Sciences and Mathematics (3)
- Engineering (2)
- Oncology (2)
-
- Science and Technology Studies (2)
- Social and Behavioral Sciences (2)
- Chemistry (1)
- Computer Sciences (1)
- Dentistry (1)
- Electrical and Computer Engineering (1)
- Genetics (1)
- Genetics and Genomics (1)
- Life Sciences (1)
- Medical Sciences (1)
- Neurology (1)
- Neurosciences (1)
- Physics (1)
- Radiochemistry (1)
- Keyword
-
- Adolescents (1)
- Adult Neurogenesis (1)
- Alzheimer's (1)
- Automation (1)
- BOLD imaging (1)
-
- Breast — Cancer – Radiotherapy (1)
- Breast — Cancer – Radiotherapy—Complications (1)
- Cancer-Therapy (1)
- Carbon-Ion-Beams (1)
- Cells (1)
- Cephalometrics (1)
- Cephalometry (1)
- Chronic Stress (1)
- Cognitive Dysfunction (1)
- DIBH (1)
- Deep inspiration breath hold (1)
- Dentate Gyrus (1)
- Dimorphism (1)
- Functional MRI (1)
- Head – Sex differences (1)
- Health Physics (1)
- Health and environmental sciences (1)
- Heart dose (1)
- Heart — Wounds and injuries (1)
- Hispanic American children (1)
- Lateral (1)
- Left breast (1)
- Leukocytes (1)
- Medical Physics (1)
- Morphological processing (1)
- Publication
- Publication Type
Articles 1 - 10 of 10
Full-Text Articles in Radiology
Statistical Measurements Of Dispersion Measure Fluctuations Of Frbs, Siyao Xu, David H. Weinberg, Bing Zhang
Statistical Measurements Of Dispersion Measure Fluctuations Of Frbs, Siyao Xu, David H. Weinberg, Bing Zhang
Physics & Astronomy Faculty Research
Extragalactic fast radio bursts (FRBs) have large dispersion measures (DMs) and are unique probes of intergalactic electron density fluctuations. By using the recently released First CHIME/FRB Catalog, we reexamined the structure function (SF) of DM fluctuations. It shows a large DM fluctuation similar to that previously reported in Xu & Zhang, but no clear correlation hinting toward large-scale turbulence is reproduced with this larger sample. To suppress the distortion effect from FRB distances and their host DMs, we focus on a subset of CHIME catalog with DM < 500 pc cm-3. A trend of nonconstant SF and nonzero correlation function (CF) at angular separations θ less than 10 is seen, but with large statistical uncertainties. The difference found between SF and that derived from CF at θ ≲ 10 can be ascribed to the large statistical uncertainties or the density inhomogeneities on scales on the order of 100 Mpc. The possible correlation of electron density fluctuations and inhomogeneities of density distribution should be tested when several thousands of FRBs are available.
Stochastic Modeling Of Radiation-Induced Dendritic Damage On In Silico Mouse Hippocampal Neurons, Eliedonna Cacao, Vipan K. Parihar, Charles L. Limoli, Francis A. Cucinotta
Stochastic Modeling Of Radiation-Induced Dendritic Damage On In Silico Mouse Hippocampal Neurons, Eliedonna Cacao, Vipan K. Parihar, Charles L. Limoli, Francis A. Cucinotta
Health Physics & Diagnostic Sciences Faculty Publications
Cognitive dysfunction associated with radiotherapy for cancer treatment has been correlated to several factors, one of which is changes to the dendritic morphology of neuronal cells. Alterations in dendritic geometry and branching patterns are often accompanied by deficits that impact learning and memory. The purpose of this study is to develop a novel predictive model of neuronal dendritic damages caused by exposure to low linear energy transfer (LET) radiation, such as X-rays, gamma-rays and high-energy protons. We established in silico representations of mouse hippocampal dentate granule cell layer (GCL) and CA1 pyramidal neurons, which are frequently examined in radiation-induced cognitive …
Creating A Dynamic, Multi-Purpose Correction For Multiple Geometries And Field Sizes To Account For Off-Axis And Asymmetric Backscatter With Varian Portal Dosimetry, Remy Manigold
UNLV Theses, Dissertations, Professional Papers, and Capstones
Intensity modulated radiation therapy and volumetric modulated arc therapy are increasingly common in radiation therapy due to their benefits of target conformity and normal tissue sparing. Due to the complexities of plan delivery and the precision required, the dose delivered must be accurately measured for quality assurance (QA). One of the most efficient ways to perform patient-specific QA when using clinical linear accelerators (linac) is to use an electronic portal imaging device (EPID). Amorphous silicon (aSi) Electronic Portal Imaging Devices (EPIDs) are attached to the linac and can provide real-time feedback with spatial resolution on the order of sub-millimeter pixel …
A Study On Automated Process For Extracting White Blood Cellular Data From Microscopic Digital Injured Skeletal Muscle Images, Bibek Karki
UNLV Theses, Dissertations, Professional Papers, and Capstones
Skeletal muscle injury is one of the common injuries caused by high-intensity sports activities, military related works, and natural disasters. In order to discover better therapies, it is important to study muscle regeneration process. Muscle regeneration process tracking is the act of monitoring injured tissue section over time, noting white blood cell behavior and cell-fiber relations. A large number of microscopic images are taken for tracking muscle regeneration process over multiple time instances. Currently, manual approach is widely used to analyze a microscopic image of muscle cross section, which is time consuming, tedious and buggy.
Automation of this research methodology …
Sex Determination Using Discriminant Function Analysis In Hispanic Children And Adolescents: A Lateral Cephalometric Study, Alyssa E. Sprowl
Sex Determination Using Discriminant Function Analysis In Hispanic Children And Adolescents: A Lateral Cephalometric Study, Alyssa E. Sprowl
UNLV Theses, Dissertations, Professional Papers, and Capstones
Lateral cephalometric radiographs have been used for years to help diagnose skeletal and dental patterns in Orthodontics. Within the last decade, these radiographs have caught the interest of the department of Anthropology for the identification of gender within the adult and adolescent population. Numerous publications have been made but failed to identify sexual dimorphism in the pre-adolescent population. 303 lateral cephalograms of pre and post Latino adolescence age ranging from 6.5 to 17.9 years old were obtained from University of Nevada, Las Vegas (UNLV) digital database. 25 variables were identified and plotted with all linear and angular measurements transferred into …
Radiography And Image Processing, Stephen E. Mitchell
Radiography And Image Processing, Stephen E. Mitchell
NSTec UNLV Symposium
Outline
• Introduction
• What? Why? Etc.
• Pulsed Power
• Diode Physics
• Radiography ABC’s
• Challenges
Establishing A Center Of Excellence For Security Science And Engineering, Ke-Xun Sun
Establishing A Center Of Excellence For Security Science And Engineering, Ke-Xun Sun
NSTec UNLV Symposium
Outline
• Introduction
• Progress report
• NNSA proposal to establishCenter of Excellence for Security Science and Engineering
• Perspective on UNLV-NSTec collaboration
Optimizing Heart Dose Reduction For Deep Inspiration Left Breast Radiotherapy, Ronald James Harder
Optimizing Heart Dose Reduction For Deep Inspiration Left Breast Radiotherapy, Ronald James Harder
UNLV Theses, Dissertations, Professional Papers, and Capstones
Multiple studies have shown that an increased risk of late injury cardiac abnormalities including congestive heart failure (CHF), ischemia, and coronary artery disease (CAD) can be associated with common left breast radiation therapy (RT) techniques. Many radiation therapy clinics have adopted the Deep Inspiration Breath Hold (DIBH) technique for the treatment of the left breast with external beam therapy based on studies showing a decrease in the dose received by the heart. A common technology used to monitor inhalation during DIBH is the Real-Time Position Management (RPM) system (Varian Medical Systems, Palo Alto, CA). This study analyzes if there is …
Development Of A Functional Mri Olfactory Protocol, Jeremy Mangum
Development Of A Functional Mri Olfactory Protocol, Jeremy Mangum
UNLV Theses, Dissertations, Professional Papers, and Capstones
Many people can spend a few days with an acute form of sinusitis, a stuffy nose, or sinus congestion that inhibits their ability to smell, but there are fourteen million Americans over the age of fifty that suffer from some form of chronic olfactory dysfunction. Some neurological disorders such as Parkinson's disease and Alzheimer's disease have demonstrated that olfactory dysfunction is a frequent and early sign. While these diseases have no known cure, there are medicines that exist to slow the progression of such debilitating illnesses. By identifying such diseases in their early stages, we can improve the quality of …
Using Thermoluminescent Dosimeters To Measure The Dose From High And Low Energy X-Ray Sources, Wesley Leon Boyd
Using Thermoluminescent Dosimeters To Measure The Dose From High And Low Energy X-Ray Sources, Wesley Leon Boyd
UNLV Theses, Dissertations, Professional Papers, and Capstones
This work focused on using thermoluminescent dosimeters (TLDs) to measure the doses from two x-ray sources, a CT scanner and a linear accelerator (linac). In addition ion chambers were used to determine the isodose contours from the operation of the linac. 1mm x 1mm x 1mm TLD-100 microcubes were placed in a Lawrence Livermore National Laboratory (LLNL) torso phantom and irradiated using a Toshiba Aquilion One 320-Slice CT Scanner. Different thicknesses of shielding composed of antimony and bismuth powder suspended in an ethylene copolymer were used to shield the phantom and the dose reduction was measured. The dose reduction ranged …