A5040706634- Radiation Dose and Imaging
- Global Cancer Incidence and Screening
- Advanced X-ray and CT Imaging
- Radiology practices and education
- Colorectal Cancer Screening and Detection
- Digital Radiography and Breast Imaging
- Kidney Stones and Urolithiasis Treatments
- AI in cancer detection
- Breast Cancer Treatment Studies
- Cancer Risks and Factors
- Prenatal Screening and Diagnostics
- Ultrasound in Clinical Applications
- Lung Cancer Diagnosis and Treatment
- Healthcare cost, quality, practices
- Pediatric Urology and Nephrology Studies
- Appendicitis Diagnosis and Management
- Gynecological conditions and treatments
- Endometrial and Cervical Cancer Treatments
- Radioactivity and Radon Measurements
- Radiomics and Machine Learning in Medical Imaging
- Medical Imaging Techniques and Applications
- Lung Cancer Treatments and Mutations
- Ovarian cancer diagnosis and treatment
- Pelvic and Acetabular Injuries
- Primary Care and Health Outcomes
University of California, San Francisco
2016-2025
Lee University
2015-2025
S.P.E.C.I.E.S.
2024
Hesco (United States)
2024
Anna Needs Neuroblastoma Answers
2024
University of California System
2016-2023
University of North Carolina at Chapel Hill
2007-2022
Mission Bio (United States)
2021
Mission Health
2021
University of Manchester
2021
Use of computed tomography (CT) for diagnostic evaluation has increased dramatically over the past 2 decades. Even though CT is associated with substantially higher radiation exposure than conventional radiography, typical doses are not known. We sought to estimate dose common studies in clinical practice and quantify potential cancer risk these examinations.
IMPORTANCE Increased use of computed tomography (CT) in pediatrics raises concerns about cancer risk from exposure to ionizing radiation.OBJECTIVES To quantify trends the CT and associated radiation risk.DESIGN Retrospective observational study.SETTING Seven US health care systems.PARTICIPANTS The was evaluated for children younger than 15 years age 1996 2010, including 4 857 736 child-years observation.Radiation doses were calculated 744 scans performed between 2001 2011.MAIN OUTCOMES AND...
Little has been published characterizing specific patterns of the dramatic rise in diagnostic imaging during past decade. In a large health plan, 377,048 patients underwent 4.9 million tests from 1997 through 2006. Cross-sectional nearly doubled over those years, rising 260 to 478 examinations per thousand enrollees year. Imaging with computed tomography (CT) doubled, and magnetic resonance (MRI) tripled. studies added existing instead replacing them, annual enrollee cost radiology more than...
Use of diagnostic imaging has increased significantly within fee-for-service models care. Little is known about patterns among members integrated health care systems.To estimate trends in utilization and associated radiation exposure systems.Retrospective analysis electronic records 6 large systems from different regions the United States. Review medical allowed direct estimation selected tests. Between 1 million 2 member-patients were included each year 1996 to 2010.Advanced rates...
There is a lack of consensus about whether the initial imaging method for patients with suspected nephrolithiasis should be computed tomography (CT) or ultrasonography.In this multicenter, pragmatic, comparative effectiveness trial, we randomly assigned 18 to 76 years age who presented emergency department undergo diagnostic ultrasonography performed by an physician (point-of-care ultrasonography), radiologist (radiology abdominal CT. Subsequent management, including additional imaging, was...
<h3>Importance</h3> Medical imaging increased rapidly from 2000 to 2006, but trends in recent years have not been analyzed. <h3>Objective</h3> To evaluate medical imaging. <h3>Design, Setting, and Participants</h3> Retrospective cohort study of patterns between 2016 among 16 million 21 patients enrolled annually 7 US integrated mixed-model insurance health care systems for individuals receiving Ontario, Canada. <h3>Exposures</h3> Calendar year country (United States vs Canada). <h3>Main...
Background: Current models for assessing breast cancer risk are complex and do not include density, a strong factor that is routinely reported with mammography. Objective: To develop validate an easy-to-use prediction model includes density. Design: Empirical based on Surveillance, Epidemiology, End Results incidence, relative hazards from prospective cohort. Setting: Screening mammography sites participating in the Breast Cancer Surveillance Consortium. Patients: 1 095 484 women undergoing...
Ms. C., a 59-year-old schoolteacher, awoke on September 8, 2009, with facial paralysis. In local emergency room, she underwent computed tomographic (CT) and magnetic resonance imaging (MRI) brain scanning. The scans were normal, Bell's palsy was diagnosed, the symptoms resolved over next few weeks. Two weeks later, C. began losing her hair in band-like distribution, following week vertigo confusion returned to where repeat CT MRI normal. Fatigue, malaise, memory loss, soon thereafter have...
Background: Reasons for persistent differences in breast cancer mortality rates among various racial and ethnic groups have been difficult to ascertain. Objective: To determine reasons disparities outcomes across groups. Design: Prospective cohort. Setting: The authors pooled data from 7 mammography registries that participate the National Cancer Institute–funded Breast Surveillance Consortium. diagnoses were ascertained through linkage with pathology databases; Surveillance, Epidemiology,...
There is wide variation in the management of thyroid nodules identified on ultrasound imaging.To quantify risk cancer associated with based imaging characteristics.Retrospective case-control study patients who underwent from January 1, 2000, through March 30, 2005. Thyroid cancers were linkage California Cancer Registry.A total 8806 11,618 examinations during period, including 105 subsequently diagnosed as having cancer. common (96.9%) and not (56.4%). Three nodule...
Abstract Objective To determine patient, institution, and machine characteristics that contribute to variation in radiation doses used for computed tomography (CT). Design Prospective cohort study. Setting Data were assembled analyzed from the University of California San Francisco CT International Dose Registry. Participants Standardized data over 2.0 million examinations adults who underwent between November 2015 August 2017 151 institutions, across seven countries (Switzerland,...
Screening mammography differs between the United States and Kingdom; a direct comparison may suggest methods to improve practice.To compare screening performance Kingdom among similar-aged women.Women aged 50 years or older were identified who underwent 5.5 million mammograms from January 1, 1996, December 31, 1999, within 3 large-scale registries programs: Breast Cancer Surveillance Consortium (BCSC, n = 978 591) National Cervical Early Detection Program (NBCCEDP, 613 388) in States; Health...
Abstract Objective Transvaginal sonography (TVS) is routinely performed as part of a pelvic sonogram in postmenopausal women, and images the endometrium are frequently obtained. In women without vaginal bleeding, threshold separating normal from abnormally thickened not known. The aim this study was to determine an endometrial thickness that should prompt biopsy woman bleeding. Methods This theoretical cohort aged 50 years older who were receiving hormone therapy. We determined risk cancer...
BackgroundWhether a change over time in clinically measured mammographic breast density influences cancer risk is unknown.
Abstract To compare the accuracy of several approaches for defining prevalent vertebral fractures from measurements dimensions (morphometry), we measured lateral bodies 115 normal premenopausal and 100 postmenopausal women. Of women two observers agreed that 49 had definite 38 were definitely normal. Using these classifications as an independent reference, then classified fractured or by definitions based on morphometry. No morphometric definition fracture perfectly with consensus...
PURPOSE: To evaluate a range of performance parameters pertinent to the comprehensive auditing diagnostic mammography examinations, and derive benchmarks therefrom, by pooling data collected from large numbers patients radiologists that are likely be representative practice in United States. MATERIALS AND METHODS: Institutional review board approval was met, informed consent not required, this study Health Insurance Portability Accountability Act compliant. Six registries contributed Breast...
Abstract BACKGROUND. The reasons for race/ethnicity (R/E) differences in breast cancer survival have been difficult to disentangle. METHODS. Surveillance, Epidemiology, and End Results (SEER)‐Medicare data were used identify 41,020 women aged ≥68 years with incident between 1994–1999 including African American (2479), Hispanic (1172), Asian/Pacific Island (1086), white (35,878). A Cox proportional hazards model assessed overall stage‐specific (0/I, II/III, IV) R/E after adjusting mammography...