Medical Biophysics Commons^™

Ai-Driven Segmentation And Volumetric Response Modeling Of Liver Regions To Radiotherapy, Aashish Chandra Gupta

Dissertations and Theses (Open Access)

In liver-directed radiotherapy (RT), liver regions receiving higher doses typically undergo atrophy while contralateral/adjacent lower-dose regions may exhibit compensatory hypertrophy through regeneration of healthy tissue. Optimizing the RT plan to promote regional hypertrophy while minimizing the risk of developing atrophy has the potential to enhance post-RT liver function and long-term survivorship. However, current clinical practice largely relies on global liver dose-volume metrics during RT-planning, which may obscure favorable dose-response correlation and limit actionable guidance for clinicians. Therefore, we hypothesized that post-RT regional liver response is governed by a combination of region-specific dose-volume and patient clinical features, and that these responses …

The Physics And Biology Of High-Risk Falls: Biomechanical Analysis And Physics Assists In Understanding Why The Threshold For High-Risk Was Lowered To 10 Feet, James Espinosa, Alan Lucerna

Rowan-Virtua Research Day

Background: Recent revisions to the National Guideline for the Field Triage of Injured Patients lowered the high-risk fall threshold from >20 feet  to >10 feet for all ages. Guideline changes are multifactorial and typically reflect epidemiologic registry data, injury severity trends, and systems-level performance feedback. However, biomechanical analysis assists in understanding the importance of the change.

Objective: To demonstrate that a 10-foot fall generates sufficient kinetic energy and deceleration forces to exceed structural tolerance thresholds in multiple human tissues, and to show that fundamental physics independently supports the recent trauma protocol change.

Methods: Application of gravitational motion equations (v = …

Analyzer-Less X-Ray Interferometry With Super-Resolution Methods, Murtuza S. Taqi

LSU Master's Theses

X-ray interferometry provides valuable information on attenuation, small-angle scattering, and differential phase contrast. This multi-modal contrast can aid in many clinical applications, such as lung diseases and breast cancer. However, standard inter- ferometry has an analyzer grating that can increase the dose requirement to maintain the same image quality as a standard X-ray. We propose the use of super-resolution methods for X-ray grating interferometry without an analyzer, with detectors that fail to meet the Nyquist sampling rate needed for traditional image recovery algorithms. Detector phase- steps are used to nominally recover the sampling and iteratively recover the visibility and the …

Health Effects Of Cadmium And Manganese Exposure On Luteinizing Hormone Levels: A Pilot Study Of Female Infertility, Shatha F. Alhous, Anees A. Al-Hamzawi, Murtadha Sh. Aswood

Al-Bahir

Female infertility occurs for many reasons, some unknown. Exposure to heavy metals is a risk factor that negatively impacts on female reproductive system. Therefore, this study aimed to evaluate the effect of cadmium Cd and manganese Mn on luteinizing hormone LH levels for females’ infertility. This study included a healthy group (n = 20), primary infertile females (n = 40), and secondary infertile females (n = 20) collected from Al-Zahraa hospital in Najaf center, Iraq. The Atomic Absorption Spectroscopy (AAS) was used to measure the cadmium and manganese concentrations and LH levels were measured by a Maglumi 800 from Snibe …

Clinical Validation Of Perfusion Imaging With Pulmonary Function Test Data Using Voronoi-Based Discretization, Jorge Cisneros, Caleb J. Herrera, Yi-Kuan Liu, Lisa V. Du, Yevgeniy Vinogradskiy, Richard Castillo, Girish Nair, Edward Castillo

Department of Medicine Faculty Papers

Objective.Accurate lung function assessment is essential for diagnosing and managing diseases like chronic obstructive pulmonary disorder, pulmonary emboli, and lung cancer. Single-photon emission computed tomography (SPECT) provides valuable 3D functional imaging of ventilation and perfusion, but is limited by low spatial resolution, availability, additional radiation, and cost. Alternative methods, including CT-based perfusion (CT-P) and deep learning models, require large datasets to validate results that are often scarce. Pulmonary function tests (PFTs) offer rapid and noninvasive global lung function measures and are clinically widely used. While ventilation correlates well with PFTs, perfusion imaging presents challenges due to complex blood flow and …

Relationships Between Clinical Symptom Scales And Eeg Biomarkers In Oud Patients, Jess Delange, Benjamin M. Latey, John Glinski, Braden Ashcraft, Jasmine Pannu, Cassidy Beatty, Lauren Knudson, Benjamin Chafetz, Bryan Fugal, Patrick Tanner Brain, N P. Griffin, Christopher Gowans, Amanda Brandaris, Amanda Page, Blake D. Harris, Sophia Delgado, Lorissa Thorpe, Kyle Bills, Andrew Payne

Annual Research Symposium

This poster examines the relationship between clinical symptom scales and electroencephalographic (EEG) biomarkers in patients with Opioid Use Disorder (OUD). Participants from inpatient substance use treatment facilities completed validated mental health and withdrawal assessments, including the COWS, PHQ-9, HAM-A, and ASRS followed by cognitive testing while undergoing 19-lead EEG recording.

Preliminary findings indicate that synthetic opioid use is associated with prolonged P300 response latency across brain regions, suggesting measurable neurophysiologic differences tied to substance type and addiction severity. The study explores how EEG metrics may complement subjective symptom reporting to provide more objective markers of addiction status, co-morbid psychiatric burden, …

Tumor Necrosis Factor Alpha Inhibition Improves Fetal Growth In A Rat Model Of Preeclampsia, Laura E. Coats, Nathan Campbell, Dylan Solise, Gabrielle M. Chamoun, Adam Z. Rawls, Alexandra Demesa, Ty Turner, Baoying Zheng, Barbara T. Alexander, Babbette Lamarca

Physiology & Biophysics

Introduction

Investigation Into The A/Ss Of Cervical Cancer And Its Effects On Tumor Control Probability In Radiation Therapy, Cameron Thayer-Freeman

Theses and Dissertations--Radiation Medicine

The standard of care for locally advanced cervical cancer is chemoradiation, consisting of conventional external beam therapy (EBT) followed by a boost of high dose rate (HDR) brachytherapy. These two radiation treatments will illicit different degrees of biological response depending on the tissue in question, and quantifying the overall effect the combined treatments will have require some form of biological modeling. The linear quadratic (LQ) model of cell survival is the most widely used radiobiological model in clinics across the nation.

It is quantified by the parameters a and ß, which model how radiation generates lethal damage in a population …

Dose Characterization Of Galactic Cosmic Rays In The Human Brain: A Phits-Based Study With A Segmented Anatomical Phantom, Shanice N. Manning

LSU Master's Theses

Astronauts aboard the International Space Station (ISS) are chronically exposed to a complex space radiation environment composed of galactic cosmic rays (GCR), solar particles, and Earth's trapped radiation. These high-energy particles interact with spacecraft shielding, producing secondary particles that can penetrate inside and deposit energy in sensitive tissues. Although animal studies have been useful in assessing space radiation risks, anatomical and physiological differences limit their applicability to human anatomy especially neuroanatomy. To address this gap, we developed a computational framework to model radiation dose distribution within the human brain using Monte Carlo simulations in Particle and Heavy Ion Transport code …

Investigation Of Subcellular Damage And Long-Term Non-Cancerous Cardiovascular Effects Following Whole-Body Photon Irradiation, Nousha Afshari

LSU Doctoral Dissertations

Current radiobiological models focus primarily on nuclear DNA damage and fail to fully explain radiation-induced noncancerous health effects. This dissertation investigates whether non-nuclear subcellular structures contribute to radiation-induced biological damage through experimental biomarker analysis and computational microdosimetry. The central hypothesis posits that whole-body photon irradiation results in subcellular non-nuclear damage, specifically increased circulating mitochondrial DNA concentrations, that correlates with radiation dose and long-term noncancerous effects such as cardiovascular disease.

Specific Aim 1 measured mitochondrial and nuclear DNA concentrations in banked blood samples from 72 Chinese rhesus macaques that previously received whole-body photon irradiation ($0-10$ Gy) from Cobalt-60 or LINAC sources. …

A Nano-Scale Approach To Controlled Apoptosis In Brain Cancer Through Magneto-Mechanical Actuation, Sakura Rieck

Biological Sciences Undergraduate Honors Theses

In this study, we investigate the effects of cell therapy and magneto-mechanical actuation (MMA) to treat glioblastoma (U87). MMA approach employs super low-frequency alternating magnetic fields (AMF) to actuate intracellular PEGylated superparamagnetic iron oxide nanoparticles (PEG-SPIONs). Magnetic forces are translated into mechanical agitation on PEG-SPIONs, which can disrupt key cellular components. We explored two ways in which the MMA approach can be used to combat cancer growth. First, we investigated MMA directly in U87 cells. Preliminary observations indicate that PEG-SPIONs are intracellularly taken up by the U87 cells via micropinocytosis. Cell-counting kit-8 toxicity assays revealed a cytotoxic effect of MMA …

Development Of Lineal Energy Spectrum-Based Biological Effects Models For Protons, Joseph M. Decunha, Fada Guan, David Grosshans, Zhongxing Liao, Dragan Mirkovic, Oleg Vassiliev, Radhe Mohan

Dissertations and Theses (Open Access)

In this dissertation, methods are developed and described to allow for the rapid calculation of microdosimetric spectra (specifically, lineal energy) for protons. SuperTrack, a GPU-accelerated tool for calculation of microdosimetric spectra was developed and is capable of computing lineal energy spectra up to 5000x faster than using Geant4 directly. Proton lineal energy spectra generated by SuperTrack are indistinguishable from those generated by Geant4. With SuperTrack, large libraries of lineal energy spectra for monoenergetic protons spanning 0-300 MeV have been developed. The proton lineal energy spectra calculated by SuperTrack have been compared to experimental measurements made by a tissue equivalent proportional …

Automated To Ols For Contour Review In Radiotherapy, Barbara Marquez

Dissertations and Theses (Open Access)

Peer review of organ-at-risk and target volume delineation is essential for patient safety and optimization of treatment outcomes. Peer review makes a substantial impact on patient outcomes, reporting notable rates of plan changes when reviewed and worse survival when patient cases are not reviewed. In around half of revised cases, target volume change is the required cause for modification (related to tumor control); in one in ten cases, it is normal tissue sparing (related to treatment toxicity). Essentially all North American institutions with accredited residency training programs hold peer review to some capacity. However, accessibility to practicing routine peer review …

Exploring The Impact Of Biological Sex On Intrinsic Connectivity Networks In Ptsd: A Data-Driven Approach., Andrew A Nicholson, Jonathan M Lieberman, Niki Hosseini-Kamkar, Kristen Eckstrand, Daniela Rabellino, Breanne Kearney, David Steyrl, Sandhya Narikuzhy, Maria Densmore, Jean Théberge, Fardous Hosseiny, Ruth A Lanius

Medical Biophysics Publications

INTRODUCTION: Sex as a biological variable (SABV) may help to account for the differential development and expression of post-traumatic stress disorder (PTSD) symptoms among trauma-exposed males and females. Here, we investigate the impact of SABV on PTSD-related neural alterations in resting-state functional connectivity (rsFC) within three core intrinsic connectivity networks (ICNs): the salience network (SN), central executive network (CEN), and default mode network (DMN).

METHODS: Using an independent component analysis (ICA), we compared rsFC of the SN, CEN, and DMN between males and females, with and without PTSD (n = 47 females with PTSD, n = 34 males with PTSD, …

Resilience And Reality: Exploring The Lived Experiences Of People Living With Hiv In Texas During The Covid-19 Pandemic – A Qualitative Study., Ahmed F. Alanazi

Social Work Dissertations - Archive

This study investigated the lived experiences of individuals living with HIV (PLWH) in the Dallas-Fort Worth (DFW) area of Texas during the COVID-19 pandemic, using an Interpretative Phenomenological Analysis (IPA) framework. The research examined the intersection of health, social dynamics, and psychological resilience among PLWH, who faced compounded vulnerabilities due to systemic inequities and the dual public health crises of HIV and COVID-19. Through semi-structured interviews with ten participants from diverse backgrounds, the study captured the profound impacts of disrupted healthcare systems, heightened stigma, and social isolation on this marginalized population. The findings reveal that the pandemic exacerbated existing inequities …

Alpha-Synuclein Interaction With Gedunin, Tony Matundura Nyabayo

Graduate Theses/Dissertations

Parkinson’s disease (PD) and other Proteinopathies develop when α-synuclein misfolds and aggregates into toxic amyloids. While existing treatments for PD are primarily focused on managing its symptoms, a viable solution for slowing down the progress of Parkinson’s disease involves targeting the toxic α-synuclein amyloids. Gedunin, a natural inhibitor of heat shock protein 90, has been extensively used to treat malaria. Also, recent research investigations have shed light on its potential beyond malaria therapy, indicating that Gedunin may offer a possible solution for treating a variety of neurodegenerative diseases. Using plate-based assays, we examined how Gedunin influences α-synuclein fibrillation and its …

Comparison Of Toxic Element Cadmium Levels In Female Patients With ‎Benign And ‎‎‎Malignant Uterine Tumors‎ By Flame Atomic Absorption ‎Spectrometry ., Hiba Ghmeedh Adhab, Liwaa Hussein Mahdi, Eman M. Al-Hilo

Maaen Journal for Medical Sciences

Cadmium is a toxic heavy metal known to be associated with various health issues, including cancer. Elevated blood cadmium levels can be a concern and may require medical evaluation and intervention. Some studies describing the etiology of cancer have focused on heavy metals, however, there is little information available for uterine cancer. This study assessed the levels of cadmium in the serum of 60 women with benign and malignant uterine tumors. Blood samples were obtained and analyzed using FAAS spectrometry in Najaf City, Iraq. Serum cadmium levels exhibited higher concentration in patients with malignant uterine tumors than those with benign …

Anxiety And Depression Amongst Female Athletes, Dp Golden, Re Obmann, Em Moore

Clinical Practice in Athletic Training

Context: Anxiety (categorized by a feeling of fear, dread, and uneasiness) and depression (mood disorder causing feelings of persistent sadness and loss of interest in things an individual once loved) are two major mental health disorders effecting females considerably who participate in sport. Females are more likely to present with anxiety (55-60%)1 and depression (1.844 times)2 compared to males. The purpose of this study was to examine the prevalence between mental health comorbidities (anxiety and depression), across female athletes aged 18-40. Methods: An anonymous survey was distributed via snowball sampling using social media. Demographic data, Generalized Anxiety Disorder-7 (GAD-7), validated …

Effects Of Sex Hormones And The Menstrual Cycle On Knee Joint Laxity In Physically Active Females: A Critically Appraised Topic, Ae Eicher, Rj Gage, K Park-Braswell

Clinical Practice in Athletic Training

Clinical Scenario: In recent years, females have exhibited increased physical activity and sport participation than ever before. Recent studies have identified a rising incidence rate of ACL injuries and indicate that the risk of ACL tears is greater in females than males. Knee laxity and physiological variation in women during the menstrual cycle have demonstrated increased ligament laxity, therefore, varying hormone concentrations may contribute to changes in ligamentous mechanical properties. Despite these findings, it remains unclear whether fluctuating sex hormone concentrations directly correlate to measurable changes in knee laxity. Clinical Question: How do fluctuations in sex hormones throughout the menstruation …

Individual Goal And Velocity Based Throwing Program For Collegiate Baseball Pitchers With Medial Elbow Injuries, Le Trail, Jm Cline, Ap Jacobsen

Clinical Practice in Athletic Training

Background: A 22-year-old male collegiate baseball pitcher experienced sudden pain in the medial left elbow following feeling a pop when pitching. The pitcher was removed from the competition and was evaluated with a point-of-care ultrasound at the conclusion of the competition. Ultrasound revealed an intact ulnar collateral ligament (UCL) and no edema. Differential Diagnosis: UCL sprain, Wrist flexor strain Treatment: The patient was referred to a primary care sports medicine physician for further evaluation. The physician found no tenderness or laxity at the UCL and ordered an MRI arthrogram for further diagnostic information. MRI revealed a grade II flexor digitorum …

Presentation Of An Accessory Navicular Bone In A Collegiate Women’S Field Hockey Player: A Type 3 Clinical Case Study, N Sutker, J Franco, K Mallory, B Hansberger

Clinical Practice in Athletic Training

Background: The accessory navicular is an extra bone located posterior and medial to the navicular tuberosity. The prevalence of accessory navicular has been reported to be 4 - 21% in the general population though this anatomical variant may often be overlooked during differential diagnosis. This case presents a female collegiate field hockey patient that was initially diagnosed with a midfoot sprain but was later determined to have an accessory navicular bone which required surgical removal. Patient: A 19-year-old female Division I collegiate field hockey patient presented to the athletic training clinic with pain in her left medial foot. The patient …

Changes In Neural Excitability Following 6-Week Of Balance Training In Individuals With Chronic Ankle Instability, Sh Chung, J Freeman, Rs Mccann

Clinical Practice in Athletic Training

Context: Individuals with chronic ankle instability (CAI) often struggle with balance issues due to changes in the central nervous system (CNS). Specifically, difficulties in modulating spinal reflexive excitability and enhancing corticospinal excitability contribute to poor balance, indicating challenges in transferring control to supraspinal centers. A recent study found that a single session of balance training could positively impact the CNS, improving spinal reflexive excitability modulation and corticospinal excitability in CAI patients. However, there is limited research on the effects of long-term balance training on neural excitability in CAI individuals. Therefore, this study aimed to investigate the effects of a 6-week …

Chronic Neck Pain, Vasculopathy, And Pre-Syncope In A Young Adult: A Type 4 Case Study, Tn Crane, K Moore, A Field

Clinical Practice in Athletic Training

Background: The patient is a 23-year-old college female presenting with chronic cervicalgia, bilateral upper extremity neurovascular symptoms, and insidious pre-syncope episodes over the past 3.5 years. Upper extremity neurovascular symptoms include bilateral numbness and tingling into the hands and bilateral throbbing arm pain originating proximal to the elbow and traveling to the fingers, which worsens with cervical rotation bilaterally. The patient has experienced 10 episodes of pre-syncope lasting less than 30 seconds that occur with cervical flexion, extension, or bilateral rotation. Pre-syncope symptoms include lightheadedness, blurry vision, increased neck/arm pain, headache, and malaise. Upon clinical evaluation, no obvious deformity, discoloration, …

Cyclops Lesion In A Collegiate Men’S Lacrosse Player: A Type 4 Clinical Case Study, K Powers, R Moen, G Siarkas

Clinical Practice in Athletic Training

Background: In late July 2023, a 20-year-old male division I lacrosse player reported to the Athletic Training clinic with pain, swelling, and an inability to fully extend his left knee. Evaluation revealed an extension deficit of 5 – 10° during active range of motion (ROM). The patient had previously undergone a double-bundle procedure to repair a torn anterior cruciate ligament (ACL) in his left knee in November 2022. Following this surgery, the patient completed a standard but conservative ACL reconstruction (ACLR) rehabilitation program as prescribed by the sports medicine team but switched to a light strength training regimen on his …

How Comorbidity With Adhd Impacts On Neurocognitive Performance In Adolescents After Sport-Related Concussions: A Scoping Review, T Chiba, Dm Emerson

Clinical Practice in Athletic Training

Context: The number of sport-related concussions (SRCs) is higher in adolescents than in other age groups and accounts for 32% of concussions. Athletes with attention-deficit hyperactivity disorder (ADHD) have a higher risk of previous history of concussion and future concussion risk compared with those without ADHD. People with ADHD present lower baseline scores of neurocognitive performances compared with those without ADHD. Neurocognitive deficits after SRC lead to increase risk of musculoskeletal injuries or another concussion after return to play (RTP) and affect RTP process. There is no consensus regarding the management of SRCs for those with ADHD. This scoping review …

A Qualitative Study Evaluating Athletic Trainers’ Self-Perceived Knowledge And Knowledge Acquisition Of Concussion Biomarkers, Kgs Swindell, T Mccormick, Jm Allen

Clinical Practice in Athletic Training

Context: Rapid movement of the brain caused by a concussion can damage brain cells and create chemical changes within the brain, which may cause lasting neurological, cognitive, and behavioral symptoms. It is suggested that following a trauma, biomarkers can be released which may be useful in accurately diagnosing concussions. Potential biomarkers being studied include β-amyloid peptide 42 [Aβ42], S100 calcium-binding protein B [S100B], glial fibrillation acidic protein [GFAB], microtubule-associated protein 2 [MAP2], and 2’,3’-cyclic-nucleotide 3'- phosphodiesterase [CNPase]. This study focuses on evaluating AT knowledge and awareness of biomarkers, with sub-analyses evaluating ATs’ perception of current knowledge of biomarkers, and the …

An Investigation Of Lower Extremity Injuries In Soccer Athletes Related To Their Playing Environment, Ak Whitlock, K Francis, H Maloney

Clinical Practice in Athletic Training

Context: The goal of this study was to investigate a connection between cleat type, surface type, and increased lower extremity injury rates in soccer athletes. Our hypothesis was that the cleat model, surface type, and facility affected the lower extremity injury rate among soccer athletes. Methods: A review of survey results distributed to the male and female soccer from an NCAA D-I program was completed. The survey investigated athlete injury history related to the specific shoe worn and the field surface information where the injury occurred. Measures of central tendency were calculated. Data was analyzed using a correlation analysis with …

Anaerobic Capacity And Lower Body Strength Deficits Related To Thermal Protective Gear In Rural Volunteer Firefighters, J Diggins, R Shagena, T Patrick, A Catanese

Clinical Practice in Athletic Training

Context: Firefighting is a dangerous job with occupational hazards, strenuous shifts, and increased work- related fatigue that contributes to risk of injury. The weight of thermal protective gear (TPG) may increase neuromuscular challenges while on-duty. The purpose of this study was to investigate the influence of TPG on volunteer firefighters’ anaerobic and lower body strength performance. Methods: Nine healthy males (mean±SD: age= 41±9.3 years; ungeared body mass= 96.47 ± 14.51kg; ungeared height=181.67 ± 4.48cm; VFF experience 8 years) participated in a cross-sectional correlation study during three visits to a university research laboratory. Participants’ TPG included thermal pants, jacket, boots, and …

Athletic Trainers’ Attitudes Towards Concussion Biomarkers And Their Future Use In Concussion Diagnosis, Jm Allen, T Mccormick, Kgs Swindell, T Campbell

Clinical Practice in Athletic Training

Context: Currently, concussions are diagnosed using subjective criteria that typically require baseline measurements to be considered accurate. In some cases, symptoms may not be immediately evident following a brain injury. Recently, studies have begun analyzing the possibility of using biomarkers as a means of objectively diagnosing concussions. However, more research and information on biomarkers are required before implementation of diagnostic methods are possible; therefore, the purpose of our study was to explore and analyze current practicing athletic trainers’ attitudes toward the future implementation of concussion biomarkers in clinical practices. Methods: A phenomenological qualitative research design was used to gather information …

Caffeine Consumption On Sports Performance Measures In College Athletes: A Critically Appraised Topic, Ja Wills, Al Fraley

Clinical Practice in Athletic Training

Focused Clinical Question: How does caffeine (CAF) consumption affect sports performance measures in healthy college athletes? Data Sources: In December 2023, PubMed was utilized to search key terms, including collegiate athlete, caffeine, and performance measures. A publication time frame from 2013-2023 was established. Study Selections: Inclusion criteria consisted of studies investigating collegiate athletes ingesting CAF and its impact on anaerobic, agility, and speed performance measures. Exclusion criteria consisted of participants with current injuries and ingredients consumed in addition to CAF. Data Extraction: Outcomes included sports performance measures such as: vertical jump test, 60- and 100-meter time trials, reaction time, maximum …