Radiology Commons^™

Predicting Long-Term Hepatocellular Carcinoma Response To Transarterial Radioembolization Using Contrast-Enhanced Ultrasound: Initial Experiences., Lauren J. Delaney, M. Tantawi, Corinne Wessner, Priscilla Machado, Flemming Forsberg, Andrej Lyshchik, Patrick O'Kane, Ji-Bin Liu, Jesse M. Civan, Alison Tan, Kevin Anton, Colette Shaw, John R. Eisenbrey

Department of Radiology Faculty Papers

Conventional cross-sectional imaging done shortly after radioembolization of hepatocellular carcinoma (HCC) does not reliably predict long-term response to treatment. This study evaluated whether quantitative contrast-enhanced ultrasound (CEUS) can predict the long-term response of HCC to yttrium-90 (Y-90) treatment. Fifteen patients underwent CEUS at three time points: immediately following treatment and 1 and 2 wk post-treatment. Response 3-6 mo after treatment was categorized on contrast-enhanced magnetic resonance imaging by two experienced radiologists using the Modified Response Evaluation Criteria in Solid Tumors. CEUS data were analyzed by quantifying tumor perfusion and residual fractional vascularity using time-intensity curves. Patients with stable disease on …

Reversing The Effects Of Androgen-Deprivation Therapy In Men With Metastatic Castration-Resistant Prostate Cancer, Catherine H Marshall, Jessa Tunacao, Varun Danda, Hua-Ling Tsai, John Barber, Rakhee Gawande, Clifford R Weiss, Samuel R Denmeade, Corinne Joshu

Department of Medical Oncology Faculty Papers

OBJECTIVE: To investigate whether bipolar androgen therapy (BAT), involving rapid cyclic administration of high-dose testosterone, as a novel treatment for metastatic castration-resistant prostate cancer (mCRPC) promotes improvements in body composition and associated improvements in lipid profiles and quality of life.

PATIENTS AND METHODS: Men from two completed trials with computed tomography imaging at baseline and after three cycles of BAT were included. Cross-sectional areas of psoas muscle, visceral and subcutaneous fat were measured at the L3 vertebral level. Functional Assessment of Chronic Illness Therapy - Fatigue questionnaire and 36-item short-form health survey were used to assess quality of life.

RESULTS: …

Are Body Surface Area Based Estimates Of Liver Volume Applicable To Children With Overweight Or Obesity? An In Vivo Validation Study., Chelsea Hosey-Cojocari, Sherwin S. Chan, Chance S. Friesen, Amie L. Robinson, Veronica Williams, Erica Swanson, Daniel O'Toole, Jansynn Radford, Neil J. Mardis, Trevor N. Johnson, J Steven Leeder, Valentina Shakhnovich

Manuscripts, Articles, Book Chapters and Other Papers

The liver is the primary organ responsible for clearing most drugs from the body and thus determines systemic drug concentrations over time. Drug clearance by the liver appears to be directly related to organ size. In children, organ size changes as children age and grow. Liver volume has been correlated with body surface area (BSA) in healthy children and adults and has been estimated by functions of BSA. However, these relationships were derived from "typical" populations and it is unknown whether they extend to estimations of liver volumes for population "outliers," such as children with overweight or obesity, who today …

Longitudinal Changes Of Regional Myelin Water Fraction During First Year After Moderate-To-Severe Diffuse Traumatic Brain Injury, Likowsky L. Desir

Dissertations, Theses, and Capstone Projects

Traumatic brain injury (TBI) is a worldwide health issue with a highly heterogeneous disease characterization, including widespread white matter damage in the brain. Most non-invasive white matter imaging methods currently available, including diffusion tensor imaging (DTI), cannot reliably measure the degree of neurodegeneration due to various confounds, making it challenging to select an endpoint measure for neuroprotective clinical trials. The present study investigates longitudinal white matter changes, measured by a novel imaging metric, apparent myelin water fraction (aMWF), and its relationship with neuropsychological measures during the first year after TBI. Data from 15 adult patients with moderate-to-severe TBI and 30 …

Medical Imaging Stewardship And Healthcare Savings: Utilization Of Age Adjusted D-Dimer To Rule Out Acute Pulmonary Embolism, Phillip Bloodworth, Casey Morris, Kenneth Cail, Brian L. Pando, Brian Helmly

HCA Healthcare Journal of Medicine

Introduction

Acute pulmonary embolism (PE) is a common diagnosis that can lead to death if left untreated. Computerized tomography pulmonary angiogram scan (CTPA) is the gold standard for diagnosis of PE. Utilization of CTPA is increasing in the emergency setting even when suspicion for PE is very low. While CTPA is helpful, radiation exposure, contrast reactions, and cost must be considered. D-dimer is a well-established, high sensitivity and low specificity laboratory test that can effectively rule out PE in low-risk patients when negative. The ADJUST-PE trial showed that there is a natural rise of D-dimer levels with age. This age …

Intra-Arterial Combination Therapy For Experimental Acute Ischemic Stroke, Michael E. Maniskas, Jill M. Roberts, Amanda A. Gorman, Gregory J. Bix, Justin F. Fraser

Neurosurgery Faculty Publications

Acute ischemic stroke continues to devastate millions of individuals worldwide. Current treatments work to restore blood flow but not rescue affected tissue. Our goal was to develop a combination of neuroprotective agents administered intra-arterially following recanalization to target ischemic tissue. Using C57Bl/6J male mice, we performed tandem transient ipsilateral middle cerebral/common carotid artery occlusion, followed by immediate intra-arterial pharmacotherapy administration through a standardized protocol. Two pharmacotherapy agents, verapamil and lubeluzole, were selected based on their potential to modulate different aspects of the ischemic cascade; verapamil, a calcium channel blocker, works in an acute fashion blocking L-type calcium channels, whereas lubeluzole, …

Implementing A Clinical Practice Guideline For Pediatric Appendicitis Safely Reduced Health Care Use And Improved Antimicrobial Stewardship, Jack Vernamonti, Robin Cotter, Jennifer Jubulis, Kartikey Pandya

Journal of Maine Medical Center

Introduction: Appendicitis is the most common emergency surgical disease in children. Those with perforated appendicitis have a more complicated and varied course. Through a clinical practice guideline (CPG), we sought to reduce computed tomography scans, laboratory draws, and exposure to broad-spectrum antibiotics without adversely affecting length of stay, hospital readmission, or repeat antibiotic administration.

Methods: Electronic records were retrospectively reviewed before and after CPG implementation, and data was collected in REDCap.

Results were reported as mean or percent incidence, and statistical analysis was done using a Student’s t-test, Mann-Whitney U test, or Pearson’s χ2 with P < .05 considered significant. Results: One hundred patients with a perforated appendix (50 before and 50 after CPG implementation) were included in our analysis. Length of stay (4.98 vs 4.46 days; P = .25), hospital readmission rate (10% vs 14%; P = .54), and additional antibiotic administration (2% vs 4%; P = .56) did not change. We observed no difference in the Pediatric Appendicitis Score (9 vs 9; P = .48) and a trending increase in evaluation at an outside hospital (56% vs 74%; P = .06). Rates of computed tomography scans did not differ overall (50% vs 40%; P = .31), but showed a decreasing trend at our institution (30% vs 12%; P = .06). We also found fewer post-operative laboratory studies (90% vs 38%; P < .01) and patients who received broad-spectrum intravenous antibiotics (92% vs 18%; P < .01).

Discussion: Through implementing the …

Sonogames: Sounds Of The Right Kind Introducing Gamification Into Radiology Training, Maria Fatima Ali, Naila Nadeem, Farah Khalid, Naveed Muhammad Anwar, Ghulam Nabie, Charles Docherty

Centre for Innovation in Medical Education

Background: Radiology as compared to other fields of medicine has lagged, in incorporating modern training modalities such as gamification and simulation into its teaching curriculum.
Objective: This study aims to evaluate effectiveness of simulation-based teaching in collaboration with gamification. Bandura's conception of self-efficacy was used to provide qualitative assessment of participants' learning process through training event. Modified competitive game-based teaching methodology was utilized in an experimental study conducted for radiology residents. Workshop was divided into two sessions, first being three interactive didactic lectures followed by three competitive rounds. All participants were required to fill pre and post-self-efficacy questionnaire along with …

The Transitional Year Internship: Five Classes Of Former Interns Reflect On Their First Clinical Year, Hana L. Haver, Kush K. Patel, Robert Chow

Advances in Clinical Medical Research and Healthcare Delivery

Objective:

The clinical internship (postgraduate year-1), which precedes many advanced residency training programs, are traditionally fulfilled by a transitional year (TY) or preliminary year of training in medicine or surgery. TY programs can take place in a variety of settings, ranging from community hospitals to large academic medical centers. In the present study, we sought to evaluate if resident physicians who completed a community hospital-based TY internship felt prepared for their subsequent specialty residency training.

Methods:

A cross-sectional survey was adapted and distributed to resident physicians who completed their TY internship at a university-affiliated community hospital in Baltimore, Maryland, between …

Gamma Knife Radiosurgery To Four Brainstem Lesions After Whole Brain Radiation Therapy, Mark E. Bernard, William St. Clair, Damodar Pokhrel

Radiation Medicine Faculty Publications

Our patient was a 58-year-old female with a history of extensive stage small cell lung cancer initially diagnosed in November 2018. She received palliative radiation to the right hip and whole brain in December of 2018 and then received chemotherapy. Unfortunately, in October 2019, the repeat brain magnetic resonance imaging (MRI) showed recurrent lesions and she was referred for Gamma Knife Radiosurgery (GKRS). At the time of the treatment, she was found to have four brainstem lesions as well as a left frontal lobe and a right frontal lobe lesion. She completed GKRS to all six lesions without any neurological …

From Mathematics To Medicine: A Practical Primer On Topological Data Analysis (Tda) And The Development Of Related Analytic Tools For The Functional Discovery Of Latent Structure In Fmri Data, Andrew Salch, Adam Regalski, Hassan Abdallah, Raviteja Suryadevara, Michael J. Catanzaro, Vaibhav A. Diwadkar

Mathematics Faculty Research Publications

fMRI is the preeminent method for collecting signals from the human brain in vivo, for using these signals in the service of functional discovery, and relating these discoveries to anatomical structure. Numerous computational and mathematical techniques have been deployed to extract information from the fMRI signal. Yet, the application of Topological Data Analyses (TDA) remain limited to certain sub-areas such as connectomics (that is, with summarized versions of fMRI data). While connectomics is a natural and important area of application of TDA, applications of TDA in the service of extracting structure from the (non-summarized) fMRI data itself are heretofore nonexistent. …

Hospital-Based Ultra-Sonographic Prevalence And Spectrum Of Thyroid Incidentalomas In Pakistani Population, Faheem Ullah Khan, Kiran Hilal, Iftikhar Ali, Mehreen Samad, Rabiya Tariq, Wiqar Ahmad, Muhammad Arif Saeed, Noman Khan

Department of Radiology

Introduction: Thyroid incidentalomas (TIs) are clinically asymptomatic nodules found accidentally during imaging studies ordered for some other reasons. Being easily accessible, non-invasive, and inexpensive, thyroid ultrasound (US) is a key investigation in the management of thyroid nodules.
Methods: This ultrasound-based cross-sectional study was performed in the radiology department of a major tertiary care hospital. Every second patient visiting the emergency department was a potential candidate for a thyroid ultrasound. Patients having ages greater than 20 years were included in the study.
Results: A total of 250 patients were included in the study. Out of these, 175 were female and 75 …

Validating Deep Learning Inference During Chest X-Ray Classification For Covid-19 Screening., Robbie Sadre, Baskaran Sundaram, Sharmila Majumdar, Daniela Ushizima

Department of Radiology Faculty Papers

The new coronavirus unleashed a worldwide pandemic in early 2020, and a fatality rate several times that of the flu. As the number of infections soared, and capabilities for testing lagged behind, chest X-ray (CXR) imaging became more relevant in the early diagnosis and treatment planning for patients with suspected or confirmed COVID-19 infection. In a few weeks, proposed new methods for lung screening using deep learning rapidly appeared, while quality assurance discussions lagged behind. This paper proposes a set of protocols to validate deep learning algorithms, including our ROI Hide-and-Seek protocol, which emphasizes or hides key regions of interest …

Primary Leiomyosarcoma Of The Distal Tibia: A Case Report., Sachin Dheer, Pamela Gekas, Faith Schick, Homyar Karanjia, Nicholas Taweel

Department of Radiology Faculty Papers

The authors present an unusual case of a leiomyosarcoma of the distal tibia. Leiomyosarcoma tumors typically originate from smooth muscle tissue. It is rare for it to derive from bone and even rarer to be found in a bone of the lower limb. Given this extreme rarity in addition to nonspecific findings on plain film radiographs and magnetic resonance imaging (MRI), biopsy was needed in this case. It was only through immunochemistry staining that a definitive diagnosis was made. As such, this case is an illustrative example of an aggressive, though rare, primary lesion of the bone which should be …

Mepilex Use In Breast Cancer Radiotherapy Patients, Yeuying Qiu, Sean Quinlan-Davidson Md

Research Scholars

No abstract provided.

Effect Of Lowering Tube Potential And Increase Iodine Concentration Of Contrast Medium On Radiation Dose And Image Quality In Computed Tomography Pulmonary Angiography Procedure: A Phantom Study, Justin E. Ngaile, Peter K. Msaki, Evarist M. Kahuluda, Furaha M. Chuma, Jerome M. Mwimanzi, Ahmed Jusabani

Imaging & Diagnostic Radiology, East Africa

The aim of the study was to examine the effect of lowering tube potential and increase iodine concentration on image quality and radiation dose in computed tomography pulmonary angiography procedure. The pulmonary arteries were simulated by three syringes. The syringes were filled with 1:10 diluted solutions of 300 mg, 350 mg and 370 mg of iodine per millilitre concentration in three water-filled phantoms simulating thin, intermediate and thick patients. The phantoms were scanned at 80 kVp, 110 kVp and 130 kVp and 0.6 second rotation time using a 16 slice computed tomography (CT) scanner. The tube current was either fixed …

Quantitative Magnetic Resonance Imaging For The Early Prediction Of Treatment Response In Triple Negative Breast Cancer, Benjamin C. Musall

Dissertations and Theses (Open Access)

Triple Negative Breast Cancer (TNBC) is an aggressive subtype of breast cancer which lacks upregulated hormone receptors. Because of this, it is not vulnerable to clinically available targeted therapies. When treated with standard of care neoadjuvant systemic therapy (NAST), TNBC only shows approximately a 40% rate of pathologic complete response (pCR). A biomarker which could predict TNBC response to NAST early during treatment would be useful, as it would allow for non-responders to be triaged to alternative therapies and potentially allow for the treatment of responders to be de-escalated.

Quantitative Magnetic Resonance Imaging (MRI) may be used to probe and …

Gemcitabine-Loaded Microbubble System For Ultrasound Imaging And Therapy., Lauren J. Delaney, John R. Eisenbrey, David Brown, Jonathan R Brody, Masaya Jimbo, Brian E Oeffinger, Maria Stanczak, Flemming Forsberg, Ji-Bin Liu, Margaret A Wheatley

Department of Radiology Faculty Papers

Ultrasound imaging presents many positive attributes, including safety, real-time imaging, universal accessibility, and cost. However, inherent difficulties in discrimination between soft tissues and tumors prompted development of stabilized microbubble contrast agents. This presents the opportunity to develop agents in which drug is entrapped in the microbubble shell. We describe preparation and characterization of theranostic poly(lactide) (PLA) and pegylated PLA (PEG-PLA) shelled microbubbles that entrap gemcitabine, a commonly used drug for pancreatic cancer (PDAC). Entrapping 6 wt% gemcitabine did not significantly affect drug activity, microbubble morphology, or ultrasound contrast activity compared with unmodified microbubbles. In vitro microbubble concentrations yielding ≥ 500nM …

Monte Carlo (Gate/Geant4) Estimation Of Clinician Hand Dose From Radionuclide Injection, H Edelman, Brian Loughery

Conference Presentation Abstracts

No abstract provided.

Incidental Finding Of Anomalous Pulmonary Venous Return Of The Left Upper Lobe, A Rare Anatomical Variation, Anika Dutta, Loren Zuiderveld

Journal of Patient-Centered Research and Reviews

Partial anomalous pulmonary venous return (PAPVR) is a rare congenital abnormality in which 1 to 3 of the pulmonary veins connect to the right atrium rather than the left atrium. In this synthesis of the literature on PAPVR of the left upper lobe, we attempt to illustrate this clinical entity using a case detected incidentally on chest computed tomography, explain the anatomical aspects of this anomaly, and summarize the reported incidence and etiology of left-sided PAPVR. Lastly, differential diagnoses, clinical relevance, and management of left-sided PAPVR are presented. The identification of this variant is important, as it may have serious …