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https://www.readbyqxmd.com/read/28338899/work-practices-and-radiation-exposure-among-male-radiologic-technologists-assisting-fluoroscopically-guided-interventional-procedures
#1
Jae Won Yun, Eun Shil Cha, Seulki Ko, Won Jin Lee
This study investigated occupational characteristics and radiation exposure among radiologic technologists assisting fluoroscopically guided interventional (FGI) procedures. A nationwide survey of radiologic technologists in South Korea was conducted. Among 8058 male respondents, 664 (8.2%) assisted FGI procedures. The survey data were linked with dosimetry data from the National Dose Registry. Most radiologic technologists assisting FGI procedures were 30-40 years old and employed by general hospitals. These technologists worked in closer proximity to patients during procedures, less frequently used shield screens, more commonly utilized protective devices, and less commonly wore badge dosemeters than the ones not assisting FGI procedures...
March 3, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/28336780/biodistribution-and-radiation-dosimetry-for-the-tau-tracer-18-f-thk-5351-in-healthy-human-subjects
#2
Ing-Tsung Hsiao, Kun-Ju Lin, Kuo-Lun Huang, Chin-Chang Huang, Han-Shiuan Chen, Shiaw-Pyng Wey, Tzu-Chen Yen, Nobuyuki Okamura, Jung-Lung Hsu
(18)F-THK-5351 is a novel radiotracer that demonstrates high binding selectivity and affinity for tau pathology and exhibits better pharmacokinetics in the living brain than previous THK tau probes. The aim of the present study was to estimate the radiation dose of (18)F-THK-5351 in humans and to compare the clinical radiation dosimetry results to estimations published previously with preclinical data. Methods: Serial whole-body positron emission tomography/computed tomography (PET/CT) imaging was performed for 240 min on 12 healthy volunteers after injecting (18)F-THK-5351 (mean administered activity: 377...
March 23, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28300380/dosimetric-characteristics-of-linatech-dmlc-h-multi-leaf-collimator-monte-carlo-simulation-and-experimental-study
#3
Mikaeil Molazadeh, Ahad Zeinali, Mostafa Robatjazi, Alireza Shirazi, Ghazale Geraily
This study evaluated the basic dosimetric characteristics of a Dynamic Multi Leaf Collimator (DMLC) using a diode detector and film measurements for Intensity Modulated Radiation Therapy Quality Assurance (IMRT QA). The EGSnrc Monte Carlo (MC) simulation system was used for the determination of MLC characteristics. Radiation transmission and abutting leaf leakage relevant to the LinaTech DMLC H were measured using an EDGE detector and EBT3 film. In this study, the BEAMnrc simulation code was used for modeling...
March 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28295846/the-enigmatic-oncogene-and-tumor-suppressor-like-properties-of-rad54b-insights-into-genome-instability-and-cancer
#4
REVIEW
Erin N McAndrew, Kirk J McManus
One of the major challenges to the cell is to ensure genome stability, which can be compromised through endogenous errors or exogenous DNA damaging agents, such as ionizing radiation or common chemotherapeutic agents. To maintain genome stability the cell has a multifaceted line of defense, including cell cycle checkpoints and DNA damage repair pathways. RAD54B is involved in many of these pathways and thus exhibits a role in maintaining and repairing genome stability following DNA damage. RAD54B is involved in cell cycle regulation after DNA damage and participates in homologous recombinational repair, which ensures the precise repair of the most deleterious DNA lesions, double-stranded breaks...
March 13, 2017: Genes, Chromosomes & Cancer
https://www.readbyqxmd.com/read/28285537/milestone-clinical-trials-of-the-national-surgical-adjuvant-breast-and-bowel-project-nsabp
#5
REVIEW
Priya Rastogi, D Lawrence Wickerham, Charles E Geyer, Eleftherios P Mamounas, Thomas B Julian, Norman Wolmark
The National Surgical Adjuvant Breast and Bowel Project (NSABP) has made significant contributions in reducing the extent of breast surgery and in improving outcomes of patients with early-stage breast cancer through the conduct of large randomized clinical trials evaluating local and systemic therapy. In 2014, the NSABP merged with two other US National Cancer Institute-funded cooperative groups, the Radiation Therapy Oncology Group (RTOG) and the Gynecologic Oncology Group (GOG), to form NRG Oncology. The combined organization has 218 member institutions with more than 600 affiliate centers located throughout the United States, Canada, Puerto Rico, and other international sites...
February 2017: Chinese Clinical Oncology
https://www.readbyqxmd.com/read/28284760/a-peer-review-process-as-part-of-the-implementation-of-clinical-pathways-in-radiation-oncology-does-it-improve-compliance
#6
Brian J Gebhardt, Dwight E Heron, Sushil Beriwal
PURPOSE: Clinical pathways are patient management plans that standardize evidence-based practices to ensure high-quality and cost-effective medical care. Implementation of a pathway is a collaborative process in our network, requiring the active involvement of physicians. This approach promotes acceptance of pathway recommendations, although a peer review process is necessary to ensure compliance and to capture and approve off-pathway selections. We investigated the peer review process and factors associated with time to completion of peer review...
January 19, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/28279472/nutritional-support-in-esophagogastric-cancers
#7
REVIEW
Elliott Birnstein, Mark Schattner
Esophageal and gastric cancers are common malignancies, both in the United States and worldwide, that carry significant morbidity and mortality. Malnutrition is a common complication in patients with esophageal and gastric cancers and it portends a poor prognosis. For patients who undergo surgical therapy for these types of cancers, preoperative and postoperative nutritional optimization have been shown to improve outcomes. The support can be accomplished in different manners, including orally, enterally, or parentally...
April 2017: Surgical Oncology Clinics of North America
https://www.readbyqxmd.com/read/28213304/photocatalytic-effects-of-titanium-dioxide-nanoparticles-on-aquatic-organisms-current-knowledge-and-suggestions-for-future-research
#8
REVIEW
Vena N Haynes, J Evan Ward, Brandon J Russell, Alexander G Agrios
Nanoparticles are entering natural systems through product usage, industrial waste and post-consumer material degradation. As the production of nanoparticles is expected to increase in the next decade, so too are predicted environmental loads. Engineered metal-oxide nanomaterials, such as titanium dioxide, are known for their photocatalytic capabilities. When these nanoparticles are exposed to ultraviolet radiation in the environment, however, they can produce radicals that are harmful to aquatic organisms...
April 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28168936/dosimetric-comparison-of-real-time-mri-guided-tri-cobalt-60-versus-linear-accelerator-based-stereotactic-body-radiation-therapy-lung-cancer-plans
#9
Andrzej P Wojcieszynski, Patrick M Hill, Stephen A Rosenberg, Craig R Hullett, Zacariah E Labby, Bhudatt Paliwal, Mark W Geurts, R Adam Bayliss, John E Bayouth, Paul M Harari, Michael F Bassetti, Andrew M Baschnagel
PURPOSE: Magnetic resonance imaging-guided radiation therapy has entered clinical practice at several major treatment centers. Treatment of early-stage non-small cell lung cancer with stereotactic body radiation therapy is one potential application of this modality, as some form of respiratory motion management is important to address. We hypothesize that magnetic resonance imaging-guided tri-cobalt-60 radiation therapy can be used to generate clinically acceptable stereotactic body radiation therapy treatment plans...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28161894/mediator-of-dna-damage-checkpoint-protein-1-mdc1-as-a-prognostic-marker-for-patients-with-oral-squamous-cell-carcinoma
#10
Jigna Harshadbhai Dave, Hemangini Hasit Vora, Nandita Radhabinod Ghosh, Trupti Indravadan Trivedi
BACKGROUND: The mediator of DNA damage checkpoint protein 1 (MDC1) is involved in the regulation of cell cycle check points and recruitment of several repair proteins to the site of DNA double stranded breaks (DSBs). The present study aims to correlate the expression of MDC1 protein with clinicopathological parameters and to evaluate its prognostic significance in patients with oral squamous cell carcinoma (OSCC). METHODS: MDC1 protein expression was evaluated immunohistochemically from untreated 100 patients with OSCC using modified H-score method...
February 4, 2017: Journal of Oral Pathology & Medicine
https://www.readbyqxmd.com/read/28152911/benchmarks-of-quality-breast-care-over-10-years
#11
F Lee Tucker, Barbara Rabinowitz, Teresa Heckel, Jennifer S Gass
272 Background: In 2005, the National Quality Measures for Breast Centers (NQMBC) was initiated as a web-based program to capture breast center performance using process of care measurements. The program participant enters data verified by the breast center director or administrator which was randomly audited. As a center submits data, their results are immediately compared with other similar centers as well as with all submitting centers. METHODS: Of the 31 measures, we focus on six pertinent measures of quality breast care; time from diagnostic mammogram to needle biopsy, time from needle biopsy to initial breast cancer surgery, breast conservation rate, use of radiation therapy for breast conserving patients, use of endocrine therapy, and use of chemotherapy...
March 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28152762/ro-ils-radiation-oncology-incident-learning-system-data-trends-2014-2015
#12
Eric C Ford, Nadine L Eads, Ksenija Kapetanovic, Cindy Tomlinson
59 Background: Incident learning is one of the most effective ways to improve quality care. To facilitate patient safety improvement at a national level, American Society for Radiation Oncology (ASTRO) and American Association of Physicists in Medicine (AAPM) launched RO-ILS: Radiation Oncology Incident Learning System in June 2014. RO-ILS mission is to facilitate safer and higher quality care through a shared learning environment that is secure and non-punitive. METHODS: To ensure the security and protection of data, ASTRO contracted with Clarity PSO, a federally-certified patient safety organization that operates under the auspices of the Patient Safety and Quality Improvement Act of 2005...
March 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28133704/studies-on-the-formation-of-formaldehyde-during-2-ethylhexyl-4-dimethylamino-benzoate-demethylation-in-the-presence-of-reactive-oxygen-and-chlorine-species
#13
Waldemar Studziński, Alicja Gackowska, Maciej Przybyłek, Jerzy Gaca
In order to protect the skin from UV radiation, personal care products (PCPS) often contain chemical UV-filters. These compounds can enter the environment causing serious consequences on the water ecosystems. The aim of this study was to examine, the effect of different factors, such as UV light, the presence of NaOCl and H2O2 on the formaldehyde formation during popular UV filter, 2-ethylhexyl 4-(dimethylamino)benzoate (ODPABA) demethylation. The concentration of formaldehyde was determined by VIS spectrophotometry after derivatization...
January 29, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28112195/neutron-radiation-tolerance-of-two-benchmark-thiophene-based-conjugated-polymers-the-importance-of-crystallinity-for-organic-avionics
#14
G M Paternò, V Robbiano, K J Fraser, C Frost, V García Sakai, F Cacialli
Aviation and space applications can benefit significantly from lightweight organic electronics, now spanning from displays to logics, because of the vital importance of minimising payload (size and mass). It is thus crucial to assess the damage caused to such materials by cosmic rays and neutrons, which pose a variety of hazards through atomic displacements following neutron-nucleus collisions. Here we report the first study of the neutron radiation tolerance of two poly(thiophene)s-based organic semiconductors: poly(3-hexylthiophene-2,5-diyl), P3HT, and the liquid-crystalline poly(2,5-bis (3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene), PBTTT...
January 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28103107/star-masses-and-star-planet-distances-for-earth-like-habitability
#15
David Waltham
This paper presents statistical estimates for the location and duration of habitable zones (HZs) around stars of different mass. The approach is based upon the assumption that Earth's location, and the Sun's mass, should not be highly atypical of inhabited planets. The results support climate-model-based estimates for the location of the Sun's HZ except models giving a present-day outer-edge beyond 1.64 AU. The statistical approach also demonstrates that there is a habitability issue for stars smaller than 0...
January 2017: Astrobiology
https://www.readbyqxmd.com/read/28048638/tu-d-201-04-veracity-of-data-elements-in-radiation-oncology-incident-learning-systems
#16
A Kapur, S Evans, D Brown, G Ezzell, D Hoopes, S Dieterich, K Kapetanovic, C Tomlinson
PURPOSE: Incident learning systems encompass volumes, varieties, values, and velocities of underlying data elements consistent with the V's of big data. Veracity, the 5th V however exists only if there is high inter-rater reliability (IRR) within the data elements. The purpose of this work was to assess IRR in the nationally deployed RO-ILS: Radiation Oncology-Incident Learning System (R) sponsored by the American Society for Radiation Oncology (ASTRO) and the American Association of Physicists in Medicine (AAPM)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047975/su-f-t-223-radiotherapy-incident-reporting-and-analysis-system-riras-early-experience
#17
R Kapoor, D Burkett, E Leidholdt, J Palta, M Hagan
BACKGROUND & PURPOSE: RIRAS is a web-based information system deployed on the Veterans Health Administration intranet in early 2014 to collect adverse events and good catch data; analyze the causes and contributing factors; and find ways to prevent future occurrences. MATERIAL AND METHODS: Incident learning consists of a feedback loop which starts with reporting an event, followed by analysis of contributing factors, and culminates in the development of a patient safety work product (PSWP) to prevent recurrence...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047744/we-a-201-01-memorial-introduction
#18
C Marshall
Chris Marshall: Memorial Introduction Donald Edmonds Herbert Jr., or Don to his colleagues and friends, exemplified the "big tent" vision of medical physics, specializing in Applied Statistics and Dynamical Systems theory. He saw, more clearly than most, that "Making models is the difference between doing science and just fooling around [ref Woodworth, 2004]". Don developed an interest in chemistry at school by "reading a book" - a recurring theme in his story. He was awarded a Westinghouse Science scholarship and attended the Carnegie Institute of Technology (later Carnegie Mellon University) where his interest turned to physics and led to a BS in Physics after transfer to Northwestern University...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047624/su-g-jep3-07-real-time-image-guided-radiation-therapy-for-heterotopic-ossification-in-patients-after-hip-replacement
#19
A Le, S Jiang, R Timmerman, H Choy, A Pompos
PURPOSE: To demonstrate the feasibility of using CBCT in a real-time image guided radiation therapy (IGRT) for single fraction heterotopic ossification (HO) in patients after hip replacement. In this real-time procedure, all steps, from simulation, imaging, planning to treatment delivery, are performed at the treatment unit in one appointment time slot. This work promotes real-time treatment to create a paradigm shift in the single fraction radiation therapy. METHODS: An integrated real-time IGRT for HO was developed and tested for radiation treatment of heterotopic ossification for patient after hip replacement...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047091/we-a-201-02-modern-statistical-modeling
#20
A Niemierko
Chris Marshall: Memorial Introduction Donald Edmonds Herbert Jr., or Don to his colleagues and friends, exemplified the "big tent" vision of medical physics, specializing in Applied Statistics and Dynamical Systems theory. He saw, more clearly than most, that "Making models is the difference between doing science and just fooling around [ref Woodworth, 2004]". Don developed an interest in chemistry at school by "reading a book" - a recurring theme in his story. He was awarded a Westinghouse Science scholarship and attended the Carnegie Institute of Technology (later Carnegie Mellon University) where his interest turned to physics and led to a BS in Physics after transfer to Northwestern University...
June 2016: Medical Physics
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