Investigative Techniques Commons^™

A Dosimetric Comparison Of 6-Mv Flattening Filter And Flattening Filter-Free Photon Beams For Stereotactic Body Radiation Therapy Of Adrenal Tumors, Sarah Mcintosh

Masters Projects

Purpose: This study aimed to compare dosimetric characteristics and treatment delivery efficiency between 6-MV Flattening Filter (FF) and Flattening Filter-Free (FFF) photon beams for adrenal Stereotactic Body Radiation Therapy (SBRT). While FFF beams have demonstrated dosimetric and efficiency advantages at other SBRT sites, there is limited data about their use in adrenal SBRT.

Methods and Materials: A retrospective dosimetric comparison was performed using 10 patients previously treated with adrenal SBRT. For each patient, two Volumetric Modulated Arc Therapy (VMAT) plans were generated in Eclipse: one using 6-MV FF beams and one using 6-MV FFF beams, resulting in 20 total treatment …

Validation And Implementation Of Automated Planning Optimization In Utah Valley Hospital, Oluwatobi Adeniji

UNLV Theses, Dissertations, Professional Papers, and Capstones

The increasing complexity of modern radiotherapy demands planning workflows that are efficient, standardized, and dosimetrically robust across diverse disease sites. Knowledge-based planning (KBP) systems such as RapidPlan offer a data-driven approach to automate and improve treatment planning by learning geometric–dosimetric relationships from high-quality clinical plans. In this work, I am evaluating the performance, generalizability, and clinical applicability of vendor-provided RapidPlan models across seven anatomical sites: intracranial SRS, prostate SBRT, right and left lung SBRT, liver SBRT, head and neck, and glioblastoma. Subsequently, a complementary institution-specific SRS model tailored to single-isocenter multitarget workflows was created. Seventy retrospectively selected patients were replanned …

Targeting The Dorsolateral Prefrontal Cortex With Transcranial Direct Current Stimulation To Improve Depression And Anxiety In Parkinson's Disease, Brock Renicks

Honors Theses

The aim of this study is to observe the outcomes of transcranial direct current stimulation (tDCS) as a treatment for Parkinson’s Disease (PD). This study will primarily look at changes in depression and anxiety, as these symptoms are often comorbid with Parkinson’s Disease. Transcranial direct current stimulation is a non-invasive, very low-intensity form of electrical stimulation of the brain. It is being increasingly used as a form of treatment for Parkinson’s Disease and depression and anxiety, however the literature is ambiguous, showing mixed results throughout various studies, with no standardization of tDCS administration. To determine the effect of tDCS on …

Comparative Investigation Of Bacterial Adhesion On Medical Device Thermoplastics, Dev V. Mehta

Honors Theses

This project will focus on determining if differences in bacterial cell wall composition influences adhesiveness to thermoplastic materials used to construct patient orthotic splints. Bacteria with decreased adhesion are unable to remain bonded to orthotic splints, increasing its ability to transfer to a patient’s wound, leading to an infection. Antibiotic resistant bacteria used in this investigation included gram-positive cocci vancomycin-resistant (VRE) Enterococcus faecalis, methicillin-resistant Staphylococcus aureus (MRSA), and gram-negative rods extended-spectrum beta-lactamase (ESBL) Escherichia coli and Pseudomonas aeruginosa. Each test bacterium is a major pathogen causing healthcare-associated infections (HAIs). Saline, artificial perspiration, and ascites fluids were used to determine the …

Determinants Of Hypertension Awareness And Control In Kenya: A Secondary Analysis Of National Survey Data, Alexander K. Davis

Honors Theses

In low- and middle-income countries (LMICs), cardiovascular diseases (CVDs) are prevalent and pose a major concern as the current healthcare systems are oriented primarily towards communicable diseases. The largest contributor to CVDs, hypertension, is a significant issue in Kenya, a model LMIC. Based on previous studies in this lab, high rates of hypertension are present in the region of Kasigau, Kenya. Kasigau is a small region within Taita-Taveta County, Kenya. Traditional risk factors are not necessarily predictive of hypertension in all regions of Kenya. This study aims to address the lack of tested risk factors for hypertension in Kenya and …

Expanding Access To Noninvasive Spinal Neuromodulation For Pediatric Spinal Cord Injury Rehabilitation: A Comparative Device Study, Alice E C Palmer

College of Arts & Sciences Senior Theses

Paralysis following spinal cord injury (SCI) has traditionally been considered permanent due to the disruption of supraspinal input to spinal motor circuits. However, growing evidence suggests that spinal networks below the level of injury retain intrinsic motor-generating capabilities through central pattern generators. Transcutaneous spinal cord stimulation (scTS) is a noninvasive neuromodulation technique that delivers electrical stimulation through the skin to reactivate these spinal networks. Although prior studies demonstrate that scTS delivered through research-grade devices is safe and effective in adults and children with chronic SCI, clinical translation remains limited by lack of FDA-approved systems, high costs, and restricted access to …

Spectral Characterization Of Colorectal Cancer Using Excitation-Scanning Hyperspectral Imaging, Natalie Hadad

Honors Theses

Colorectal cancer is one of the most common and deadly cancers worldwide, with a lifetime risk of approximately one in twenty-three for men and one in twenty-five for women. Although early detection significantly improves survival, current diagnostic approaches such as tissue biopsy are invasive, reliant on subjective interpretation, have extended turnaround times, and risk missing flat or depressed lesions that are more difficult to detect than raised polyps. These limitations highlight the need for objective, minimally invasive technologies capable of detecting early tissue changes. This study investigates excitation-scanning hyperspectral imaging (Ex-HSI) as a label-free optical approach for identifying colorectal cancer–associated …

Novel Biomarker Discovery In Multiple Sclerosis, Manisha Gangasani

Honors Theses

Multiple Sclerosis (MS) is a chronic neuroinflammatory disorder affecting the brain, spinal cord, and optic nerve. Patients experience cognitive, motor, autonomic, and emotional symptoms that often overlap with other neurological conditions, making early diagnosis challenging. Current diagnostic criteria require evidence of lesions with dissemination in time and space. Racial disparities in MS outcomes are well documented, with Black individuals often exhibiting greater disease severity, higher relapse rates, and increased disability compared to White individuals. These differences likely reflect a combination of genetic, biological, environmental, and healthcare access factors, underscoring the need to improve early diagnosis and reduce inequities in care. …

Developing A Protocol For Non-Cellular Transplantation Of Donor Mitochondria Into Recipient Cells, Andrew Parton

Honors Theses

Tumor innervation has emerged as a critical feature of cancer progression, with increased nerve density correlating with enhanced aggressiveness, metastatic dissemination, and poor clinical outcome. However, the functional contribution of neurons to tumor biology remains incompletely defined. We recently identified the intercellular transfer of mitochondria from neurons to cancer cells as a mechanism that promotes tumor progression. We therefore hypothesized that disruption of this transfer could attenuate tumor aggressivity. To directly investigate this process, we developed an approach to isolate mitochondria from donor cells and transplant them into recipient cancer cells independently of canonical cell-cell interactions. Transferred mitochondria were tracked …

An Investigation Of Data Granularity In Rag Pipelines For Personalized Medicine, Paritosh Pandey

Master's Theses

Generative AI, exemplified by large language models like the OpenAI GPT and Meta LLaMA families, can produce diverse content in response to prompts. This capability offers a promising solution to challenges in precision medicine, which seeks to tailor treatments to individual clinical profiles but often struggles with data collection, cost, and privacy concerns. By generating realistic, privacy-preserving patient data, generative AI has the potential to transform patient-centric healthcare. With such motivation, this research develops a comprehensive Generative AI pipeline emphasizing data granularity for accurate prediction of personalized treatments. The pipeline features a central Large Language Model interacting with a Machine …

The Role Of Intravascular Ultrasound Imaging In 30-Day Readmissions Among Acute St-Elevation Myocardial Infarction Patients, Britta Watson

MUSC Theses and Dissertations

Cardiovascular disease (CVD) remains one of the leading causes of death in the United States. Coronary artery disease (CAD) is the largest contributor to deaths that result from cardiovascular disease. When CAD is left untreated, it can result in an acute ST elevation myocardial infarction (STEMI). To treat coronary blockages caused by CAD, a percutaneous coronary intervention (PCI) is performed. A PCI is a non-invasive procedure that uses coronary balloons and stents to open a narrowed or blocked coronary artery and restore blood flow.

An acute ST elevation myocardial infarction (STEMI) is a major cause of early hospital readmissions. Technological …

Non-Invasive Detection Of Intracranial Pressure, Andrei V. Nesterenko

Honors Undergraduate Theses

Intracranial pressure is a critical metric used when managing tumors, strokes, TBIs, hydrocephalus, and other operative conditions. Traditional methods for continuous ICP monitoring, intraparenchymal catheters, epidural transducers etc., are invasive and carry a high risk of infection. Previous attempts to create accurate, easy to use, and non-invasive ICP monitoring techniques have been unsuccessful. In this study, we investigated the utility of supraorbital and posterior auricular photoplethysmography to monitor changes in ICP during orthostatic tilt and hyperventilation, which increase and decrease ICP respectively.

Through a continuous 5-minute recording on a tilt-table we characterized SOA and PAA waveforms in 12 participants (ages …

Absolute Quantification And Identification Of Rna From Rna-Lipid Nanoparticles Using High Resolution Mass Spectrometry, Jason C. Funderburk

Theses and Dissertations

RNA therapeutics are a rising drug category with potential use for a range of conditions encompassing infectious diseases to therapies for cancer, diseases, and genetic disorders. RNA-lipid nanoparticles (RNA-LNPs) are the prominent delivery method for these therapeutics approved products include mRNA vaccines and polyneuropathy treatments. The emergency use authorizations and orphan drug status of current RNA-LNP drugs has allowed approval without finalization of the regulatory analytical procedures for quality monitoring. The objective of the study was to develop an LC-MS assay to simultaneously measure identity and concentration of two therapeutically relevant intact RNA constructs extracted from RNA-LNPs to enhance quality …

Beyond The Square Pulse: Waveform Shape, Eeg Correlates, And The Pursuit Of Natural Sensation In Tens, Jason Whitson

Honors Undergraduate Theses

This study investigates the relationship between electrical stimulus characteristics of shape and charge on evoked sensations and electroencephalogram (EEG) data during multi-waveform transcutaneous electrical nerve stimulation (TENS) of the median nerve. Neuromodulation methods have traditionally had little control over the location and quality of their associated evoked sensation (e.g., electric, vibration, touch). This experiment utilized five unique stimulus waveforms during TENS stimulation. EEG data were collected concurrently to provide an introductory objective measure of the neural responses underlying these sensory changes. Eleven participants completed three tasks (thresholding, super-threshold stimulation, two-alternative forced choice) using a two-electrode TENS approach. Stimulus waveforms were …

Pediatric Anesthesia And Virtual Reality: Managing Perioperative Pain And Anxiety– A Scoping Review, Moneer Sharafi, Mason Pham, Alec Wiscombe

Doctoral Projects

Pediatric surgery is common, but it often causes considerable anxiety and pain. A staggering percentage of children experience preoperative anxiety, which can heighten pain, delay recovery, and contribute to complications such as emergence delirium and longer-term behavioral issues (Fortier & Kain, 2015). Virtual reality (VR), which immerses users in computer-generated environments, has been proposed as a distraction technique to reduce these challenges. This Doctor of Nursing Practice (DNP) project conducted a scoping review to examine the effectiveness of VR in reducing perioperative pain and anxiety in pediatric patients. The review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses …

Point-Of-Care Ultrasound (Pocus): Measuring Inferior Vena Cava (Ivc) Diameter And Collapsibility In The Preoperative Setting, Jordan Parker, Dakota Kilpatrick

Doctoral Projects

Among the many aspects of preparation required for patients undergoing general anesthesia, preoperative optimization is key. One goal of preoperative optimization is the establishment of adequate preoperative intravascular fluid volume. Inadequate fluid volume can increase surgical risks and lead to adverse patient outcomes. Evidence has demonstrated that using point-of-care ultrasound (POCUS) to assess preoperative surgical patients can diminish the consequences associated with altered fluid status and increase the likelihood of hemodynamic stability. One of the varying methods of POCUS is the point-of-care focused cardiac ultrasound (FOCUS). Using FOCUS, the practitioner can measure the IVC diameter and collapsibility index to determine …

Dual-Task Interaction Between Vestibular Function And Cognitive Processing Using The P300 Event-Related Potential, Laurel Elise Money-Nolan

Graduate Theses and Dissertations (2019 - present)

Previous research has established links between vestibular function and cognitive processing, aging and cognitive function, and aging and vestibular function. Theories of cognitive resource allocation discuss how cognitive resources, such as attention, are devoted towards and divided between tasks when multitasking. This dual-task study, utilizing a balance task and a listening/cognitive task, across the young- and middle-aged adult age range, aimed to evaluate potential relationships between vestibular function, cognition, and age, and to examine how cognitive resources might be allocated under dual-task conditions.

The dual-task protocol in this study utilized an oddball paradigm with tonal stimuli to measure the P300 …

Implementation Of A Triage System For The Residents At A Residential Facility To Improve Triage Assessment Skills Of The Staff As Well As Improve The Level And Timeliness Of Care, Andrew J. Choi Rn, Neha Gopal Rn, Andres N. Padilla Rn, Dana Son

Master's Projects and Capstones

Triage is an integral part of the clinical process which involves assessing patients and determining their level of care in order to get them appropriate, timely treatment. Several countries utilize a standardized triage system with established criteria to aid staff in their decision-making during assessments (Peta et al., 2023). The Nursing and Residential Triage (NaRT) tool, from the Manchester Triage System (MTS), was shown to enhance staff clinical assessment skills and help avoid inappropriate ED transfers during a study among older adults in a residential facility (Markey et al., 2024). For this project, the main issue identified at the residential …

Surveying Management Strategies For Pediatric Autoimmune Hepatitis, Lillie Baca

University Honors Theses

Pediatric autoimmune hepatitis (PAIH) is a long-term condition that requires ongoing treatment and regular monitoring. It is characterized by its elevation of liver enzymes, interface hepatitis, and the specific presence of circulating autoantibodies. There is a general lack of consensus on appropriate measures of diagnostic criteria, treatment medication, and beneficial practices for monitoring the disease. The existing literature contains several subtle discrepancies that challenge a practitioner's judgement for care management of children with autoimmune hepatitis. This study is a retrospective chart review aimed at understanding the current diagnostics, treatment, and long-term management strategies of PAIH at a single center. Also, …

Development Of A Light-Based Platform To Assess Cervical Mucus Barrier Function And Physical Mucus Properties, Elizabeth J. Buzbee

McKelvey School of Engineering Graduate Student Theses & Dissertations

Preterm birth is the leading cause of neonatal morbidity and mortality worldwide, yet current clinical tools for predicting its risk lack specificity and reliability. Cervical mucus plays a crucial role in maintaining pregnancy by forming a barrier that protects the uterus against infection. This study investigates the use of laser speckle rheology as a noninvasive technique to assess cervical mucus biomechanics. Synthetic cervical mucus was fabricated at varying hydration levels and tested using a conventional rheometer that confirmed that the mechanical properties of the synthetic mucus samples were representative of physiological cervical mucus. These results were compared to the complex …

Zonal Hepatocellular Responses To Acute Ethanol: Impacts On Mitochondrial Function And Metabolism, Matthew T. Savoca

MUSC Theses and Dissertations

Background: Ethanol (EtOH) consumption causes hepatocellular mitochondrial depolarization (mtDepo) and mitophagy. Here, the Aims were to develop techniques to characterize sublobular hepatocellular metabolism and the distribution of mtDepo and mitophagy after acute EtOH. Methods: Wildtype and GFP-LC3 transgenic mice were treated with EtOH or vehicle and administered the covalently labeling mitochondrial membrane potential (ΔΨ) reporter, MitoTracker Red (MTR), and/or the non-covalent ΔΨ reporter, rhodamine 123 (Rh123), prior to intravital imaging, liver fixation, or hepatocyte isolation. After in vivo MTR, hepatocytes were isolated and sorted. Enrichment in E-cadherin (ECAD) and cytochrome P4502E1 in periportal (PP) and pericentral (PC) hepatocytes, respectively, validated …

Role Of Eye-Tracking Technology And Software Algorithms In Enhancing Adhd Detection And Diagnosis: A Systematic Literature Review, Lauren E. Perkins

Honors College Theses

This systematic literature review explores the role of eye-tracking technology and software algorithms in enhancing the detection and diagnosis of ADHD. ADHD, a neurodevelopmental disorder affecting both children and adults, is traditionally diagnosed through behavioral assessments, which may lack objectivity. Recent studies suggest that eye-tracking, specifically focusing on saccades, fixations, and blink rates, offers the potential for more accurate and objective measures of ADHD. The review examines clinical trials, observational studies, and machine learning research to assess the correlation between ADHD and eye movement patterns. Results indicate that individuals with ADHD exhibit distinct eye movement patterns, which can be quantified …

Respiratory Cycle Influence On Lumbosacral Muscle Function: A Tensiomyographic Analysis, Anthony Trombetta

Honors Undergraduate Theses

Introduction:

Tensiomyography (TMG) has significant potential in examining muscle functionality while evading the limitations found in other methods muscle analysis. Specifically, the erector spinae and other lumbosacral muscles can be analyzed with little challenge. Such analyses include data on muscle displacement (Dm), delay time (Td), contraction time (Tc), half-relaxation time (Tr), and sustain time (Ts). Of these parameters, the most evaluated and with the highest level of reliability are Dm, Td, and Tc. However, stiffness of the lumbar spine and lumbosacral muscles fluctuates throughout the respiratory cycle. These fluctuations may pose an issue when examining the functionality of muscles. This …

Explorations Of Dna-Single-Walled Carbon Nanotube Interactions To Develop Multiplexed Molecularly Specific Biosensors For Inflammation, Amelia K. Ryan

Dissertations and Theses

Inflammatory cytokines such as interleukin-6 (IL-6) and interleukin-12 (IL-12) are central regulators of immune signaling and key biomarkers of disease, yet existing assays for their detection remain slow, invasive, and lack multiplexing ability. This dissertation advances the development of single-walled carbon nanotube (SWCNT) optical nanosensors capable of real-time, multiplexed, and molecularly specific cytokine detection through innovative use of single-stranded DNA (ssDNA) interfaces.

First, an IL-6-specific DNA aptamer was employed as both a dispersing agent and recognition probe for SWCNT fluorescence sensing. Sequence modifications, including anchor domains, truncations, and thermally induced refolding, were systematically tested to optimize sensitivity and selectivity. The …

Effects Of High-Frequency Repetitive Transcranial Magnetic Stimulation On Impulse Control Disorders In Patients With Parkinson’S Disease On Dopamine Replacement Therapy, Katherine Muksuris

Graduate Theses, Dissertations, and Problem Reports (ETD)

Parkinson’s Disease (PD) is a debilitating neurodegenerative disorder that causes motor deficits, cognitive impairment, and depression. The mainstay treatment for motor symptoms is dopamine replacement therapy (DRT). DRT takes the form of levodopa or dopamine receptor agonists (DAs) and can be associated with impulse control disorders (ICDs). Currently, the approach to mitigating these side effects is to decrease or stop DRT, which may cause motor symptoms to return, making the management of the disorder more difficult. Repetitive transcranial magnetic stimulation (rTMS) is a noninvasive neuromodulation treatment for multiple disorders, including its approved use for smoking cessation. It has also shown …

Investigating The Production Challenges Of The P100.1 Phage Endolysin, Jonah O. Frago

EWU Masters Thesis Collection

Acne vulgaris is one of the most common skin diseases globally. One key aspect of acne pathogenesis is the disturbance of healthy strain diversity of the skin bacterium Cutibacterium acnes. Many acne treatments are antimicrobial; however, these treatments are generally nonspecific and carry a variety of side effects in addition to contributing to rising antibiotic resistance. Lytic bacteriophages (or phages) are viruses that infect and kill bacteria. Their lytic lifestyle is facilitated by enzymes called endolysins. Phages have been studied as an alternative to traditional antimicrobials in acne treatment and have shown reduced C. acnes load in acne lesions and …

Accessible Real-Time Eye-Gaze Tracking For Neurocognitive Health Assessments, A Multimodal Web-Based Approach, Daniel C. Tisdale

Master's Theses

We introduce a novel integration of real-time, predictive eye-gaze tracking models into a multimodal dialogue system tailored for remote health assessments. This system is designed to be highly accessible requiring only a conventional webcam for video input along with minimal cursor interaction and utilizes engaging gaze-based tasks that can be performed directly in a web browser. We have crafted dynamic subsystems that capture high-quality data efficiently and maintain quality through instances of user attrition and incomplete calls. Additionally, these subsystems are designed with the foresight to allow for future re-analysis using improved predictive models, as well as enable the creation …

Detection Of Sars-Cov-2 Nucleocapsid And Spike Antibodies In Serum Of Covid-19 Vaccinated And Infected Patients Utilizing Immunoblot Assay, Suzanna Horn

Honors Theses

In 2020, the world was introduced to COVID-19, a strain of Coronavirus that quickly caused a pandemic at the global scale. COVID-19 was reported to cause 5.94 million deaths between 2020-2021, and it continues to prevail amongst society in 2024. Many methods of preventing COVID-19 infection arose throughout this time period; however, mRNA vaccines against the SARS-CoV-2 spike (S) protein became the most effective way to protect the population from COVID-19’s destructive reign.

Although society has made significant scientific strides in Coronavirus testing and vaccination efforts, there are many improvements that must be made to better protect our society from …

A Comprehensive Examination Of Age-Related Lower Limb Muscle Function Asymmetries Across A Variety Of Muscle Contraction Types, Kylee Heap

All Graduate Reports and Creative Projects, Fall 2023 to Present

Previous research has found that lower limb muscle asymmetries increase with age and are linked to fall and injury risks. However, past studies lacked a wide variety of muscle function modes and measures as well as comparison to a comparable young aged group. The purpose of this study was to examine age-related lower limb muscle function asymmetries across a variety of muscle contraction types and velocities in young and old adults. Lower limb muscle balance, strength, power, and velocity were evaluated with concentric, isometric, isotonic, and eccentric muscle actions during a single-leg stance test and on single- and multi-joint dynamometers …

Neuromodulation Of Mouse Auditory Cortex Using Focused Ultrasound, Jacob Hehir

NYMC Student Theses and Dissertations

Neurological diseases impose a large health and financial burden for nations worldwide. Current treatments for many conditions are limited to pharmacological or invasive surgical approaches. Neuromodulation is an alternative therapy wherein electrical currents, magnetic fields, or electromagnetic waves are used to noninvasively modify brain function. Focused ultrasound (FUS) has been shown to alter neural activity, theoretically with much higher spatial resolution than other neuromodulation techniques. However, these predictions assume that neuromodulatory effects are constrained to the acoustic focus. Given that the architecture of neural circuitry in the cerebral cortex supports delicately balanced lateral processing on spatial scales that may exceed …