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Radiation risk from computers

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https://www.readbyqxmd.com/read/27913507/diagnosis-of-suspected-venous-thromboembolism
#1
Clive Kearon
The primary goal of diagnostic testing for venous thromboembolism (VTE) is to identify all patients who could benefit from anticoagulant therapy. Test results that identify patients as having a ≤2% risk of VTE in the next 3 months are judged to exclude deep vein thrombosis (DVT) or pulmonary embolism (PE). Clinical evaluation, with assessment of: (1) clinical pretest probability (CPTP) for VTE; (2) likelihood of important alternative diagnoses; and (3) the probable yield of D-dimer and various imaging tests, guide which tests should be performed...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27903187/stereotactic-diffusion-tensor-imaging-tractography-for-gamma-knife-radiosurgery
#2
Cormac G Gavin, H Ian Sabin
OBJECTIVE The integration of modern neuroimaging into treatment planning has increased the therapeutic potential and safety of stereotactic radiosurgery. The authors report their method of integrating stereotactic diffusion tensor imaging (DTI) tractography into conventional treatment planning for Gamma Knife radiosurgery (GKRS). The aim of this study was to demonstrate the feasibility of this technique and to address some of the technical limitations of previously reported techniques. METHODS Twenty patients who underwent GKRS composed the study cohort...
December 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27893452/confounding-of-the-association-between-radiation-exposure-from-ct-scans-and-risk-of-leukemia-and-brain-tumors-by-cancer-susceptibility-syndromes
#3
Johanna M Meulepas, Cécile M Ronckers, Johannes Merks, Michel E Weijerman, Jay H Lubin, Michael Hauptmann
Recent studies linking radiation exposure from pediatric computed tomography (CT) to increased risks of leukemia and brain tumors lacked data to control for cancer susceptibility syndromes (CSS). These syndromes might be confounders because they are associated with an increased cancer risk and may increase the likelihood of pediatric CT scans. We identify CSS predisposing to leukemia and brain tumors through a systematic literature search and summarize prevalence and risk. Since empirical evidence is lacking in published literature on patterns of CT use for most types of CSS, we estimate confounding bias of relative risks (RR) for categories of radiation exposure based on expert opinion about patterns of CT scans among CSS patients...
November 28, 2016: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/27885077/highlights-of-the-russian-health-studies-program-and-updated-research-findings
#4
Barrett N Fountos
Recognized for conducting cutting-edge science in the field of radiation health effects research, the Department of Energy's (DOE) Russian Health Studies Program has continued to generate excitement and enthusiasm throughout its 23-year mission to assess worker and public health risks from radiation exposure resulting from nuclear weapons production activities in the former Soviet Union. The three goals of the Program are to: (1) clarify the relationship between health effects and chronic, low-to-medium dose radiation exposure; (2) estimate the cancer risks from exposure to gamma, neutron, and alpha radiation; and (3) provide information to the national and international organizations that determine radiation protection standards and practices...
November 24, 2016: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/27884463/gated-carbon-ion-scanning-treatment-for-pancreatic-tumour-with-field-specific-target-volume-and-organs-at-risk
#5
Kentaro Miki, Shinichiro Mori, Miho Shiomi, Shigeru Yamada
OBJECTIVE: To assess the feasibility of treatment planning for pancreatic tumours subject to respiratory motion using field-specific target volumes (FTV) and field-specific organs at risk (FOAR) using four-dimensional computed tomography (4DCT). METHODS: Fourteen pancreatic cancer patients underwent 4DCT. Radiation oncologists contoured the gross tumour volume (GTV), clinical target volume (CTV), spinal cord, duodenum, kidneys, and stomach. The gating duty cycle was set to 30 % around exhalation...
November 21, 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27872541/splenic-metastasis-from-cancer-of-uterine-cervix-a-rare-case
#6
Jagannath Dixit, Noor Mohammed, Preethi Shetty
Cancer of uterine cervix is one of the most common malignancies in women. Metastatic recurrence of cervical cancer in spleen is rare, mostly seen in autopsies. Splenic metastasis from cervical cancer in a living patient without disseminated metastases is rarer. Here, we present the case of a lady aged 46 years with cervical cancer-squamous cell carcinoma-who had undergone radical hysterectomy and postoperative 50 Gy of intensity modulated radiation therapy in 25 fractions and 50 mg of weekly cisplatin for 6 weeks...
December 2016: Indian Journal of Surgical Oncology
https://www.readbyqxmd.com/read/27866569/computed-tomography-in-germany
#7
Roman Pokora, Lucian Krille, Steffen Dreger, Choonsik Lee, Christian Günster, Hajo Zeeb, Maria Blettner
BACKGROUND: In 2001, calculations in models based on atomic bomb survivors indicated that children exposed to ionizing radiation by computed tomography (CT) would be expected to have an increased risk of cancer. This led to the issuance of new recommendations in Germany concerning CT in children. METHODS: We analyzed data from the German pediatric CT cohort study together with data on children from a large general statutory health insurance provider (AOK) in order to characterize the secular trend in the use of CT in Germany...
October 28, 2016: Deutsches Ärzteblatt International
https://www.readbyqxmd.com/read/27852501/longitudinal-pilot-analysis-of-radiation-exposure-during-the-course-of-growing-rod-treatment-for-early-onset-scoliosis
#8
Gregory M Mundis, Jeff B Pawelek, Edward K Nomoto, Michael W Hennessy, Burt Yaszay, Behrooz A Akbarnia
STUDY DESIGN: Retrospective consecutive case series. OBJECTIVES: To estimate the amount of ionizing radiation (IR) exposure in growing rod (GR) surgery for early-onset scoliosis. SUMMARY OF BACKGROUND DATA: There is substantial evidence of the health hazards attributed to IR exposure. However, no studies have estimated the amount of IR exposure in GR surgery. MATERIALS AND METHODS: A consecutive single-center series of GR patients were retrospectively reviewed...
January 2016: Spine Deformity
https://www.readbyqxmd.com/read/27846931/-ccafu-french-national-guidelines-2016-2018-on-retroperitoneal-sarcoma
#9
T Murez, A Fléchon, L Rocher, P Camparo, N Morel-Journel, P-H Savoie, L Ferretti, P Sèbe, A Méjean, X Durand
INTRODUCTION: The purpose of this article was established by the external genitalia group CCAFU recommandations for diagnosis, treatment and monitoring of retroperitoneal sarcomas, intended for urologists. MATERIAL AND METHODS: The multidisciplinary working group has updated the 2013 guidelines, based on an exhaustive review of the literature on PubMed, valued references, level of evidence, to assign grades of recommendation. RESULTS: From a clinical suspicion evoking a RPS, computed tomography thoraco abdominal and pelvic is the gold standard...
November 2016: Progrès en Urologie
https://www.readbyqxmd.com/read/27846460/coronary-risk-stratification-of-patients-undergoing-surgery-for-valvular-heart-disease
#10
Rasmus Bo Hasselbalch, Thomas Engstrøm, Mia Pries-Heje, Merete Heitmann, Frants Pedersen, Morten Schou, Hans Mickley, Hanne Elming, Rolf Steffensen, Lars Køber, Kasper Iversen
BACKGROUND: Multislice computed tomography (MSCT) is a non-invasive, less expensive, low-radiation alternative to coronary angiography (CAG) prior to valvular heart surgery. MSCT has a high negative predictive value for coronary artery disease (CAD) but previous studies of patients with valvular disease have shown that MSCT, as the primary evaluation technique, lead to re-evaluation with CAG in about a third of cases and it is therefore not recommended. If a subgroup of patients with low- to intermediate risk of CAD could be identified and examined with MSCT, it could be cost-effective, reduce radiation and the risk of complications associated with CAG...
November 9, 2016: International Journal of Cardiology
https://www.readbyqxmd.com/read/27843513/bilateral-choroidal-metastases-from-endobronchial-carcinoid-treated-with-somatostatin-analogues
#11
Deborah De Bruyn, Jan Lamont, Erik Vanderstraeten, Simon Van Belle, Elise Platteau, Julie De Zaeytijd, Kristien P Hoornaert
OBJECTIVE: To describe a patient with bilateral multifocal choroidal metastases from an endobronchial carcinoid treated with a somatostatin analogue. METHOD: A 60-year-old woman presenting with photopsia in the left eye underwent an extensive ophthalmic examination, including fluorescein angiography, OCT and ultrasound. RESULTS: Fundoscopy revealed a small retinal tear in the left eye, for which she received laser treatment. In addition, choroidal masses were detected in both eyes...
2016: Open Ophthalmology Journal
https://www.readbyqxmd.com/read/27843035/consensus-contouring-guidelines-for-postoperative-stereotactic-body-radiation-therapy-for-metastatic-solid-tumor-malignancies%C3%A2-to-the-spine
#12
Kristin J Redmond, Scott Robertson, Simon S Lo, Scott G Soltys, Samuel Ryu, Todd McNutt, Samuel T Chao, Yoshiya Yamada, Amol Ghia, Eric L Chang, Jason Sheehan, Arjun Sahgal
PURPOSE: To develop consensus contouring guidelines for postoperative stereotactic body radiation therapy (SBRT) for spinal metastases. METHODS AND MATERIALS: Ten spine SBRT specialists representing 10 international centers independently contoured the clinical target volume (CTV), planning target volume (PTV), spinal cord, and spinal cord planning organ at risk volume (PRV) for 10 representative clinical scenarios in postoperative spine SBRT for metastatic solid tumor malignancies...
September 17, 2016: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/27842674/radiation-dose-in-cardiac-spect-ct-an-estimation-of-ssde-and-effective-dose
#13
Hamid Abdollahi, Isaac Shiri, Yazdan Salimi, Maghsoud Sarebani, Reza Mehdinia, Mohammad Reza Deevband, Seied Rabi Mahdavi, Ahmad Sohrabi, Ahmad Bitarafan-Rajabi
AIMS: The dose levels for Computed Tomography (CT) localization and attenuation correction of Single Photon Emission Computed Tomography (SPECT) are limited and reported as Volume Computed Tomography Dose Index (CTDIvol) and Dose-Length Product (DLP). This work presents CT dose estimation from Cardiac SPECT/CT based on new American Association of Physicists in Medicine (AAPM) Size Specific Dose Estimation (SSDE) parameter, effective dose, organ doses and also emission dose from nuclear issue...
December 2016: European Journal of Radiology
https://www.readbyqxmd.com/read/27837144/radiation-protection-in-computed-tomography
#14
Scott L Cupp
Radiation exposure from computed tomography (CT) examinations has long been a concern. As part of their education, CT technologists learn the fundamentals of radiation interactions, dose, risk, and protection. Modern CT systems have evolved to include dose optimization features. This article reviews the fundamentals of radiation dose and introduces new CT dose optimization techniques.
November 2016: Radiologic Technology
https://www.readbyqxmd.com/read/27837120/recommendations-for-high-risk-clinical-target-volume-definition-with-computed-tomography-for-three-dimensional-image-guided-brachytherapy-in-cervical-cancer-patients
#15
Tatsuya Ohno, Masaru Wakatsuki, Takafumi Toita, Yuko Kaneyasu, Ken Yoshida, Shingo Kato, Noriko Li, Sunao Tokumaru, Hitoshi Ikushima, Takashi Uno, Shin-Ei Noda, Tomoko Kazumoto, Yoko Harima
Our purpose was to develop recommendations for contouring the computed tomography (CT)-based high-risk clinical target volume (CTVHR) for 3D image-guided brachytherapy (3D-IGBT) for cervical cancer. A 15-member Japanese Radiation Oncology Study Group (JROSG) committee with expertise in gynecological radiation oncology initiated guideline development for CT-based CTVHR (based on a comprehensive literature review as well as clinical experience) in July 2014. Extensive discussions occurred during four face-to-face meetings and frequent email communication until a consensus was reached...
November 10, 2016: Journal of Radiation Research
https://www.readbyqxmd.com/read/27829431/radiomics-based-targeted-radiotherapy-planning-rad-trap-a-computational-framework-for-prostate-cancer-treatment-planning-with-mri
#16
Rakesh Shiradkar, Tarun K Podder, Ahmad Algohary, Satish Viswanath, Rodney J Ellis, Anant Madabhushi
BACKGROUND: Radiomics or computer - extracted texture features have been shown to achieve superior performance than multiparametric MRI (mpMRI) signal intensities alone in targeting prostate cancer (PCa) lesions. Radiomics along with deformable co-registration tools can be used to develop a framework to generate targeted focal radiotherapy treatment plans. METHODS: The Rad-TRaP framework comprises three distinct modules. Firstly, a module for radiomics based detection of PCa lesions on mpMRI via a feature enabled machine learning classifier...
November 10, 2016: Radiation Oncology
https://www.readbyqxmd.com/read/27824812/projected-cancer-risks-potentially-related-to-past-current-and-future-practices-in-paediatric-ct-in-the-united-kingdom-1990-2020
#17
Neige M Y Journy, Choonsik Lee, Richard W Harbron, Kieran McHugh, Mark S Pearce, Amy Berrington de González
BACKGROUND: To project risks of developing cancer and the number of cases potentially induced by past, current, and future computed tomography (CT) scans performed in the United Kingdom in individuals aged <20 years. METHODS: Organ doses were estimated from surveys of individual scan parameters and CT protocols used in the United Kingdom. Frequencies of scans were estimated from the NHS Diagnostic Imaging Dataset. Excess lifetime risks (ELRs) of radiation-related cancer were calculated as cumulative lifetime risks, accounting for survival probabilities, using the RadRAT risk assessment tool...
November 8, 2016: British Journal of Cancer
https://www.readbyqxmd.com/read/27807955/-exposure-to-ionizing-radiation-from-computed-tomography-ct-in-childhood-and-cancer-risk
#18
Emilio Antonio Luca Gianicolo, Roman Pokora, Lucian Krille, Maria Blettner
A recent US cohort study estimated 500 cancer cases attributable to exposure to CT out of 600,000 children aged <15 years who underwent a computed tomography (CT) to head or abdomen. This review synthetizes the evidence on the association between exposure to ionizing radiation through CT and cancer risk. Five cohort studies were identified. Three studies show clear increases in cancer risk among children and adolescents who underwent at least one CT. All studies had methodological limits, among which the lack of an individual level estimate of dose-organ specific absorbed by patient and problems of statistical power...
September 2016: Epidemiologia e Prevenzione
https://www.readbyqxmd.com/read/27806588/source-modeling-for-monte-carlo-dose-calculation-of-ct-examinations-with-a-radiotherapy-treatment-planning-system
#19
Hans-Erik Källman, Rickard Holmberg, Jonas Andersson, Love Kull, Erik Tranéus, Anders Ahnesjö
PURPOSE: Radiation dose to patients undergoing examinations with Multislice Computed Tomography (MSCT) as well as Cone Beam Computed Tomography (CBCT) is a matter of concern. Risk management could benefit from efficient replace rational dose calculation tools. The paper aims to verify MSCT dose calculations using a Treatment Planning System (TPS) for radiotherapy and to evaluate four different variations of bow-tie filter characterizations for the beam model used in the dose calculations...
November 2016: Medical Physics
https://www.readbyqxmd.com/read/27801855/pediatric-exposures-to-ionizing-radiation-carcinogenic-considerations
#20
REVIEW
Kristy R Kutanzi, Annie Lumen, Igor Koturbash, Isabelle R Miousse
Children are at a greater risk than adults of developing cancer after being exposed to ionizing radiation. Because of their developing bodies and long life expectancy post-exposure, children require specific attention in the aftermath of nuclear accidents and when radiation is used for diagnosis or treatment purposes. In this review, we discuss the carcinogenic potential of pediatric exposures to ionizing radiation from accidental, diagnostic, and therapeutic modalities. Particular emphasis is given to leukemia and thyroid cancers as consequences of accidental exposures...
October 28, 2016: International Journal of Environmental Research and Public Health
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