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Radiation risk from computers

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https://www.readbyqxmd.com/read/28389933/effect-of-radiation-dose-reduction-on-texture-measures-of-trabecular-bone-microstructure-an-in-vitro-study
#1
Muthu Rama Krishnan Mookiah, Thomas Baum, Kai Mei, Felix K Kopp, Georg Kaissis, Peter Foehr, Peter B Noel, Jan S Kirschke, Karupppasamy Subburaj
Osteoporosis is characterized by bone loss and degradation of bone microstructure leading to fracture particularly in elderly people. Osteoporotic bone degeneration and fracture risk can be assessed by bone mineral density and trabecular bone score from 2D projection dual-energy X-ray absorptiometry images. However, multidetector computed tomography image based quantification of trabecular bone microstructure showed significant improvement in prediction of fracture risk beyond that from bone mineral density and trabecular bone score; however, high radiation exposure limits its use in routine clinical in vivo examinations...
April 7, 2017: Journal of Bone and Mineral Metabolism
https://www.readbyqxmd.com/read/28386043/nongated-cardiac-computed-tomographic-angiograms-for-detection-of-embolic-sources-in-acute-ischemic-stroke
#2
Leonard L L Yeo, Staffan Holmin, Tommy Andersson, Erik Lundström, Anil Gopinathan, Er Luen Lim, Benjamin S H Leong, Win Sen Kuan, Eric Ting, Benjamin Y Q Tan, Sterling Ellis Eide, Edgar L K Tay
BACKGROUND AND PURPOSE: We assessed the feasibility of obtaining diagnostic quality images of the heart and thoracic aorta by extending the z axis coverage of a non-ECG-gated computed tomographic angiogram performed in the primary evaluation of acute stroke without increasing the contrast dose. METHODS: Twenty consecutive patients with acute ischemic stroke within the 4.5 hours of symptom onset were prospectively recruited. We increased the longitudinal coverage to the domes of the diaphragm to include the heart...
April 6, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28376826/the-risk-of-cataractogenesis-after-gamma-knife-radiosurgery-a-nationwide-population-based-case-control-study
#3
Cheng-Loong Liang, Po-Chou Liliang, Tai-Been Chen, Huan-Chen Hsu, Fu-Cheng Chuang, Kuo-Wei Wang, Hao-Kuang Wang, San-Nan Yang, Han-Jung Chen
BACKGROUND: Medical radiation is considered a factor responsible for cataractogenesis. However, the incidence of this ophthalmologic complication resulting from gamma knife radiosurgery (GKRS) has not yet been reported. The present study aimed to determine the risk of cataractogenesis associated with radiation exposure from GKRS. METHODS: This study used information from a random sample of one million persons enrolled in the nationally representative Taiwan National Health Insurance Research Database...
April 4, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28373718/delta-radiomics-features-for-the-prediction-of-patient-outcomes-in-non-small-cell-lung-cancer
#4
Xenia Fave, Lifei Zhang, Jinzhong Yang, Dennis Mackin, Peter Balter, Daniel Gomez, David Followill, Aaron Kyle Jones, Francesco Stingo, Zhongxing Liao, Radhe Mohan, Laurence Court
Radiomics is the use of quantitative imaging features extracted from medical images to characterize tumor pathology or heterogeneity. Features measured at pretreatment have successfully predicted patient outcomes in numerous cancer sites. This project was designed to determine whether radiomics features measured from non-small cell lung cancer (NSCLC) change during therapy and whether those features (delta-radiomics features) can improve prognostic models. Features were calculated from pretreatment and weekly intra-treatment computed tomography images for 107 patients with stage III NSCLC...
April 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28369536/the-influence-of-physique-on-dose-conversion-coefficients-for-idealised-external-photon-exposures-a-comparison-of-doses-for-chinese-male-phantoms-with-10th-50th-and-90th-percentile-anthropometric-parameters
#5
Wei Lv, Hengda He, Qian Liu
For evaluating radiation risk, the construction of anthropomorphic computational phantoms with a variety of physiques can help reduce the uncertainty that is due to anatomical variation. In our previous work, three deformable Chinese reference male phantoms with 10th, 50th and 90th percentile body mass indexes and body circumference physiques (DCRM-10, DCRM-50 and DCRM-90) were constructed to represent underweight, normal weight and overweight Chinese adult males, respectively. In the present study, the phantoms were updated by correcting the fat percentage to improve the precision of radiological dosimetry evaluations...
March 22, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28356770/breast-cancer-in-patients-with-li-fraumeni-syndrome-a-case-series-study-and-review-of-literature
#6
Amara G Nandikolla, Sangeetha Venugopal, Jesus Anampa
BACKGROUND: Li-Fraumeni Syndrome (LFS) is a rare disease with autosomal dominant inheritance linked to germline mutations of tumor suppressor gene TP53. These patients are predisposed to malignancies such as sarcoma, breast cancer, leukemia, and other malignancies. Breast cancer, the most common malignancy in adult patients with LFS, has an early-onset presentation and is usually treated as per the guidelines for the general population due to the limited literature about breast cancer in LFS...
2017: Breast Cancer: Targets and Therapy
https://www.readbyqxmd.com/read/28351519/contrast-enhanced-ultrasound-for-the-evaluation-of-blunt-pediatric-abdominal-trauma
#7
Lindsey B Armstrong, David P Mooney, Harriet Paltiel, Carol Barnewolt, Beatrice Dionigi, Mary Arbuthnot, Chinwendu Onwubiko, Susan A Connolly, Delma Y Jarrett, Jill M Zalieckas
INTRODUCTION: Blunt abdominal trauma is a common problem in children. Computed tomography (CT) is the gold standard for imaging in pediatric blunt abdominal trauma, however up to 50% of CTs are normal and CT carries a risk of radiation-induced cancer. Contrast enhanced ultrasound (CEUS) may allow accurate detection of abdominal organ injuries while eliminating exposure to ionizing radiation. METHODS: Children aged 7-18years with a CT-diagnosed abdominal solid organ injury underwent grayscale/power Doppler ultrasound (conventional US) and CEUS within 48h of injury...
March 20, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28350541/computational-hybrid-anthropometric-paediatric-phantom-library-for-internal-radiation-dosimetry
#8
Tianwu Xie, Niels Kuster, Habib Zaidi
Hybrid computational phantoms combine voxel-based and simplified equation-based modelling approaches to provide unique advantages and more realism for the construction of anthropomorphic models. In this work, a methodology and C++ code are developed to generate hybrid computational phantoms covering statistical distributions of body morphometry in the paediatric population. The paediatric phantoms of the Virtual Population Series (IT'IS Foundation, Switzerland) were modified to match target anthropometric parameters, including body mass, body length, standing height and sitting height/stature ratio, determined from reference databases of the National Centre for Health Statistics and the National Health and Nutrition Examination Survey...
April 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28347453/creation-of-a-simple-natural-language-processing-tool-to-support-an-imaging-utilization-quality-dashboard
#9
Jordan Swartz, Christian Koziatek, Jason Theobald, Silas Smith, Eduardo Iturrate
BACKGROUND: Testing for venous thromboembolism (VTE) is associated with cost and risk to patients (e.g. radiation). To assess the appropriateness of imaging utilization at the provider level, it is important to know that provider's diagnostic yield (percentage of tests positive for the diagnostic entity of interest). However, determining diagnostic yield typically requires either time-consuming, manual review of radiology reports or the use of complex and/or proprietary natural language processing software...
May 2017: International Journal of Medical Informatics
https://www.readbyqxmd.com/read/28347158/effective-dose-in-low-dose-ct-compared-with-radiography-for-templating-of-total-hip-arthroplasty
#10
Mats Geijer, Gustav Rundgren, Lars Weber, Gunnar Flivik
Background Recently, total hip arthroplasty (THA) has come to focus on restoration of individual anatomy including femoral neck anteversion and global offset (femoral and acetabular offset). Three-dimensional (3D) computed tomography (CT) data could provide a better basis for preoperative templating. The use of CT has been hampered by high radiation dose. Purpose To evaluate the effective dose used in pelvis and hip CT for THA templating. Material and Methods CT data from two clinical trials of THA were evaluated for CT scan length and volume CT dose index (CTDIvol)...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28344795/validation-of-a-tool-predicting-important-findings-on-computed-tomography-among-crohn-s-disease-patients
#11
REVIEW
Shail M Govani, Akbar K Waljee, Keith E Kocher, Jason M Swoger, Melissa Saul, Peter Dr Higgins
BACKGROUND: Patients with Crohn's disease (CD) are frequently subjected to computed tomography (CT) in the emergency department (ED). This young population is at higher risk of malignancy from radiation exposure. OBJECTIVES: We aimed to validate a decision tool predicting complications (perforation, abscess or other serious finding) on imaging at two sites. METHODS: We conducted a retrospective review of CT outcomes among patients with CD with ED visits at two tertiary care centers...
March 2017: United European Gastroenterology Journal
https://www.readbyqxmd.com/read/28344603/isobio-software-biological-dose-distribution-and-biological-dose-volume-histogram-from-physical-dose-conversion-using-linear-quadratic-linear-model
#12
Tanwiwat Jaikuna, Phatchareewan Khadsiri, Nisa Chawapun, Suwit Saekho, Ekkasit Tharavichitkul
PURPOSE: To develop an in-house software program that is able to calculate and generate the biological dose distribution and biological dose volume histogram by physical dose conversion using the linear-quadratic-linear (LQL) model. MATERIAL AND METHODS: The Isobio software was developed using MATLAB version 2014b to calculate and generate the biological dose distribution and biological dose volume histograms. The physical dose from each voxel in treatment planning was extracted through Computational Environment for Radiotherapy Research (CERR), and the accuracy was verified by the differentiation between the dose volume histogram from CERR and the treatment planning system...
February 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28342453/ionizing-radiation-biomarkers-in-epidemiological-studies-an-update
#13
REVIEW
Janet Hall, Penny A Jeggo, Catharine West, Maria Gomolka, Roel Quintens, Christophe Badie, Olivier Laurent, An Aerts, Nataša Anastasov, Omid Azimzadeh, Tamara Azizova, Sarah Baatout, Bjorn Baselet, Mohammed A Benotmane, Eric Blanchardon, Yann Guéguen, Siamak Haghdoost, Mats Harms-Ringhdahl, Julia Hess, Michaela Kreuzer, Dominique Laurier, Ellina Macaeva, Grainne Manning, Eileen Pernot, Jean-Luc Ravanat, Laure Sabatier, Karine Tack, Soile Tapio, Horst Zitzelsberger, Elisabeth Cardis
Recent epidemiology studies highlighted the detrimental health effects of exposure to low dose and low dose rate ionizing radiation (IR): nuclear industry workers studies have shown increased leukaemia and solid tumour risks following cumulative doses of <100mSv and dose rates of <10mGy per year; paediatric patients studies have reported increased leukaemia and brain tumours risks after doses of 30-60mGy from computed tomography scans. Questions arise, however, about the impact of even lower doses and dose rates where classical epidemiological studies have limited power but where subsets within the large cohorts are expected to have an increased risk...
January 2017: Mutation Research
https://www.readbyqxmd.com/read/28335802/use-of-low-dose-computed-tomography-to-assess-pulmonary-tuberculosis-among-healthcare-workers-in-a-tuberculosis-hospital
#14
Wei He, Bu-Dong Chen, Yan Lv, Zhen Zhou, Jin-Ping Xu, Ping-Xin Lv, Xin-Hua Zhou, Feng-Gang Ning, Cheng-Hai Li, Dong-Po Wang, Jie Zheng
BACKGROUND: According to the World Health Organization, China is one of 22 countries with serious tuberculosis (TB) infections and one of the 27 countries with serious multidrug-resistant TB strains. Despite the decline of tuberculosis in the overall population, healthcare workers (HCWs) are still at a high risk of infection. Compared with high-income countries, the TB prevalence among HCWs is higher in low- and middle-income countries. Low-dose computed tomography (LDCT) is becoming more popular due to its superior sensitivity and lower radiation dose...
March 24, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28316914/morphometric-analysis-of-prognathic-and-non-prognathic-mandibles-in-relation-to-bsso-sites-using-cbct
#15
Tengku Aszraf Tengku Shaeran, Ramizu Shaari, Shafulizan Abdul Rahman, Mohammad Khursheed Alam, Alauddin Muhamad Husin
BACKGROUND: Bilateral sagittal split osteotomy (BSSO) is the most versatile procedure and adopted by many surgeons to relocate the mandible in patients having mandibular prognathism (MP). Injury to the inferior alveolar nerve (IAN) and unfavorable splits are two surgical complications of BSSO which are associated with mandibular morphology. Uses of cone beam computed tomography (CBCT) in providing 3-D images has gained a wider acceptance in surgical field nowadays. Its advantages are including reduced cost, lesser radiation dose and smaller physical footprint comparing to the conventional computed tomography...
January 2017: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/28315025/practices-and-attitudes-towards-radiation-risk-disclosure-for-computed-tomography-survey-of-emergency-medicine-residency-program-directors
#16
Jennifer R Marin, Karen E Thomas, Angela M Mills, Joshua S Broder, Kathy Boutis
PURPOSE: The purposes of this study were to evaluate the frequency with which emergency physicians involved in residency leadership disclose potential malignancy risks from computed tomography (CT), assess comfort with these discussions, and evaluate factors influencing risk disclosure. METHODS: We surveyed emergency medicine residency program directors and associate/assistant directors. Primary outcome was the proportion who "almost always" or "most of the time" discussed potential risks...
March 17, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/28300381/comparison-of-ct-images-with-average-intensity-projection-free-breathing-and-mid-ventilation-for-dose-calculation-in-lung-cancer
#17
Chirasak Khamfongkhruea, Sangutid Thongsawad, Chirapha Tannanonta, Sasikarn Chamchod
The purpose of this study was to compare three computed tomography (CT) images under different conditions-average intensity projection (AIP), free breathing (FB), mid-ventilation (MidV)-used for radiotherapy contouring and planning in lung cancer patients. Two image sets derived from four-dimensional CT (4DCT) acquisition (AIP and MidV) and three-dimensional CT with FB were generated and used to plan for 29 lung cancer patients. Organs at risk (OARs) were delineated for each image. AIP images were calculated with 3D conformal radiotherapy (3DCRT) and intensity-modulated radiation therapy (IMRT)...
March 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297341/assessment-of-monte-carlo-algorithm-for-compliance-with-rtog-0915-dosimetric-criteria-in-peripheral-lung-cancer-patients-treated-with-stereotactic-body-radiotherapy
#18
Damodar Pokhrel, Sumit Sood, Rajeev Badkul, Hongyu Jiang, Christopher McClinton, Christopher Lominska, Parvesh Kumar, Fen Wang
The purpose of the study was to evaluate Monte Carlo-generated dose distributions with the X-ray Voxel Monte Carlo (XVMC) algorithm in the treatment of peripheral lung cancer patients using stereotactic body radiotherapy (SBRT) with non-protocol dose-volume normalization and to assess plan outcomes utilizing RTOG 0915 dosimetric compliance criteria. The Radiation Therapy Oncology Group (RTOG) protocols for non-small cell lung cancer (NSCLC) currently require radiation dose to be calculated using tissue density heterogeneity corrections...
May 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28295382/investigation-of-interfractional-shape-variations-based-on-statistical-point-distribution-model-for-prostate-cancer-radiation-therapy
#19
Yusuke Shibayama, Hidetaka Arimura, Taka-Aki Hirose, Takahiro Nakamoto, Tomonari Sasaki, Saiji Ohga, Norimasa Matsushita, Yoshiyuki Umezu, Yasuhiko Nakamura, Hiroshi Honda
PURPOSE: The setup errors and organ motion errors pertaining to clinical target volume (CTV) have been considered as two major causes of uncertainties in the determination of the CTV-to-planning target volume (PTV) margins for prostate cancer radiation treatment planning. We based our study on the assumption that interfractional target shape variations are not negligible as another source of uncertainty for the determination of precise CTV-to-PTV margins. Thus, we investigated the interfractional shape variations of CTVs based on a point distribution model (PDM) for prostate cancer radiation therapy...
March 15, 2017: Medical Physics
https://www.readbyqxmd.com/read/28292601/a-survey-of-cone-beam-computed-tomographic-use-among-endodontic-practitioners-in-the-united-states
#20
Frank C Setzer, Nathan Hinckley, Meetu R Kohli, Bekir Karabucak
INTRODUCTION: Cone-beam computed tomographic (CBCT) imaging is an emerging technology for clinical endodontic practice. The aim of this study was to investigate the acceptance, accessibility, and usage of CBCT imaging among American Association of Endodontists members in the United States by means of an online survey. METHODS: An invitation to participate in a web-based survey was sent to 3076 members of the American Association of Endodontists. The survey consisted of 8 questions on demographics, access to CBCT machines, field of view (FOV), frequency of use for particular applications, and reasons in case CBCT was not used...
March 11, 2017: Journal of Endodontics
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