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https://www.readbyqxmd.com/read/29786616/derivation-of-new-diagnostic-reference-levels-for-neuro-paediatric-computed-tomography-examinations-in-switzerland
#1
Franca Wagner, Julie Bize, Damien Racine, Regis Le Coultre, Verdun Francis, Philipp Trueb, Reto Treier
Definition of new national diagnostic reference levels (DRLs) for volume computed tomography dose index (CTDIvol) and dose length product (DLP) for neuro-paediatric CT examinations depending on the medical indication.
 Methods: Paediatric cranial CT data sets acquired between January 2013 and December 2016 were retrospectively collected between July 2016 and March 2017 from the eight largest university and cantonal hospitals that perform most of the neuro-paediatric CTs in Switzerland. A consensus review of CTDIvol and DLP was undertaken for the three defined anatomical regions: brain, facial bone and petrous bone; each with and without contrast medium application...
May 22, 2018: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/29664918/effect-of-arm-position-presence-of-medical-devices-and-off-centering-during-acquisition-of-scout-image-on-automatic-tube-voltage-selection-and-current-modulation-in-pediatric-chest-ct
#2
Young Jin Ryu, Young Hun Choi, Jung-Eun Cheon, Ji Eun Park, Woo Sun Kim, In-One Kim
PURPOSE: To evaluate the patients' morphologic factors affecting radiation dose in pediatric chest CT. MATERIALS AND METHODS: From November 2013 to May 2015, 315 pediatric chest CT scans were obtained using a CT scanner, and classified into 5 groups according to the patients' age. For each age group, the chest CT scans were divided into two subgroups. A cut-off value used was the 75th percentile of size-specific dose estimates (SSDE), age-specific diagnostic reference level (DRL): less than the 75th percentile of SSDE (Group A, n = 238) and greater than the 75th percentile of SSDE (Group B, n = 77)...
2018: PloS One
https://www.readbyqxmd.com/read/29608943/differential-reinforcement-of-low-rates-differentially-decreased-timing-precision
#3
Matthew L Eckard, Elizabeth G E Kyonka
Timing processes have been implicated as potential mechanisms that underlie self-controlled choice. To investigate the impact of an intervention that has been shown to increase self-controlled choice on timing processes, accuracy and precision of temporal discrimination were assessed in an 18-s peak procedure (18-s fixed interval trials; 54-s peak trials). During an intervention phase, mice in three treatment groups experienced differential reinforcement of low rate (DRL) schedules of reinforcement of 27 s, 18 s, or 9 s...
March 30, 2018: Behavioural Processes
https://www.readbyqxmd.com/read/29605110/digital-imaging-and-radiographic-practise-in-diagnostic-radiography-an-overview-of-current-knowledge-and-practice-in-europe
#4
S Mc Fadden, T Roding, G de Vries, M Benwell, H Bijwaard, J Scheurleer
INTRODUCTION: Recent research has identified the issue of 'dose creep' in diagnostic radiography and claims it is due to the introduction of CR and DR technology. More recently radiographers have reported that they do not regularly manipulate exposure factors for different sized patients and rely on pre-set exposures. The aim of the study was to identify any variation in knowledge and radiographic practice across Europe when imaging the chest, abdomen and pelvis using digital imaging...
May 2018: Radiography
https://www.readbyqxmd.com/read/29605105/optimisation-of-radiation-dose-and-image-quality-in-mobile-neonatal-chest-radiography
#5
V I Hinojos-Armendáriz, S J Mejía-Rosales, M C Franco-Cabrera
PURPOSE: To optimise the radiation dose and image quality for chest radiography in the neonatal intensive care unit (NICU) by increasing the mean beam energy. METHODS: Two techniques for the acquisition of NICU AP chest X-ray images were compared for image quality and radiation dose. 73 images were acquired using a standard technique (56 kV, 3.2 mAs and no additional filtration) and 90 images with a new technique (62 kV, 2 mAs and 2 mm Al filtration). The entrance surface air kerma (ESAK) was measured using a phantom and compared between the techniques and against established diagnostic reference levels (DRL)...
May 2018: Radiography
https://www.readbyqxmd.com/read/29580788/tailoring-ct-dose-to-patient-size-implementation-of-the-updated-2017-acr-size-specific-diagnostic-reference-levels
#6
Yan Klosterkemper, Elisabeth Appel, Christoph Thomas, Oliver T Bethge, Joel Aissa, Patric Kröpil, Gerald Antoch, Johannes Boos
RATIONALE AND OBJECTIVES: To use an automatic computed tomography (CT) dose monitoring system to analyze the institutional chest and abdominopelvic CT dose data as regards the updated 2017 American College of Radiology (ACR) diagnostic reference levels (DRLs) based on water-equivalent diameter (Dw) and size-specific dose estimates (SSDE) to detect patient-size subgroups in which CT dose can be optimized. MATERIALS AND METHODS: All chest CT examinations performed between July 2016 and April 2017 with and without contrast material, CT of the pulmonary arteries, and abdominopelvic CT with and without contrast material were included in this retrospective study...
March 23, 2018: Academic Radiology
https://www.readbyqxmd.com/read/29567269/quality-assurance-in-ct-implementation-of-the-updated-national-diagnostic-reference-levels-using-an-automated-ct-dose-monitoring-system
#7
E Appel, P Kröpil, O T Bethge, J Aissa, C Thomas, G Antoch, J Boos
AIM: To evaluate the implementation of the updated computed tomography (CT) diagnostic reference levels (DRLs) from the German Federal Office for Radiation Protection into clinical routine using an automatic CT dose monitoring system. METHODS AND MATERIALS: CT radiation exposure was analysed before and after implementing the updated national DRLs into routine clinical work in 2016. After the implementation process, institutional CT protocols were mapped to the anatomical regions for which DRLs were provided...
March 20, 2018: Clinical Radiology
https://www.readbyqxmd.com/read/29537302/radiation-dose-optimisation-for-conventional-imaging-in-infants-and-newborns-using-automatic-dose-management-software-an-application-of-the-new-2013-59-euratom-directive
#8
L Alejo, E Corredoira, F Sánchez-Muñoz, C Huerga, Z Aza, R Plaza-Núñez, A Serrada, M Bret-Zurita, M Parrón, C Prieto-Areyano, G Garzón-Moll, R Madero, E Guibelalde
Objective: The new 2013/59 EURATOM Directive (ED) demands dosimetric optimisation procedures without undue delay. The aim of this study was to optimise paediatric conventional radiology examinations applying the ED without compromising the clinical diagnosis. METHODS: Automatic dose management software (ADMS) was used to analyse 2678 studies of children from birth to 5 years of age, obtaining local diagnostic reference levels (DRLs) in terms of entrance surface air kerma. Given local DRL for infants and chest examinations exceeded the European Commission (EC) DRL, an optimisation was performed decreasing the kVp and applying the automatic control exposure...
April 9, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29535926/assessment-of-effective-dose-associated-with-coronary-computed-tomography-angiography-in-isfahan-province-iran
#9
Mohammadbagher Tavakoli, Reihane Faraji, Zahra Alirezaei, Zohre Nateghian
Computed tomography coronary angiography (CTCA) has generated a great interest over the past two decades, due to its high diagnostic accuracy and efficacy in the assessment of patients having coronary artery disease. This method is associated with high radiation dose and this has raised serious concerns in the literature. Effective dose (E) is a single parameter meant to reflect the relative risk from exposure to ionizing radiation. Therefore, it is necessary to calculate this parameter to indicate ionizing radiation relative risk...
January 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29463428/swiss-survey-on-hybrid-imaging-cts-doses-in-nuclear-medicine-and-proposed-national-dose-reference-levels
#10
REVIEW
Thiago V M Lima, Silvano Gnesin, Nick Ryckx, Klaus Strobel, Nicolas Stritt, Reto Linder
A multidisciplinary working group led by the Swiss Federal Office of Public Health was formed to plan and perform a nationwide survey of patient radiation exposure from computed tomography (CT) in hybrid devices across Nuclear Medicine departments. The survey included 16 departments (of which 5 were university hospitals) and the submitted responses included 10,673 entries for the 33 different protocols proposed (11 in PET and 22 in SPECT). The working group determined the selection and exclusion criteria applied to the analysis...
February 17, 2018: Zeitschrift Für Medizinische Physik
https://www.readbyqxmd.com/read/29462483/estimation-of-diagnostic-reference-levels-for-ct-coronarography-in-slovakia
#11
Zuzana Bárdyová, Martina Horváthová, Denisa Nikodemová
The coronary CT angiography (CCTA) is a frequent diagnostic method connected with large variability of effective dose. Therefore, it is the type of examination where optimization is very important and the use of a national diagnostic reference level (DRL) recommended. In Slovakia the DRL for interventional radiology examinations until now fails. The objective of our study was to propose the national DRL for CCTA examinations in Slovak Republic, on the basis of a cross-sectional multicenter study, performed in four departments of radiology...
February 16, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29459547/-8-drl-for-nuclear-medicine
#12
Takashi Iimori
No abstract text is available yet for this article.
2018: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/29425381/automatic-acquisition-of-ct-radiation-dose-data-using-the-diagnostic-reference-level-for-radiation-dose-optimization
#13
Yoshihiro Nakada, Yasuo Okuda, Tatsuya Tsuge, Jyunichi Suzuki, Hiroshi Sakamoto, Tsuyoshi Yamamoto, Yasuhiko Konishi, Takeshi Tsujimoto, Shigeo Nishiki, Toshimitsu Satoh, Nobukazu Aoyama, Kyohei Morimoto, Masamichi Aita, Yusuke Yamashita, Takayasu Yoshitake, Masami Mukai, Yuki Yokooka, Noriya Yokohama, Keiichi Akahane
The present work describes that we try to construct a system that collects dose information that performed CT examination from multiple facilities and unified management. The results of analysis are compared with other National diagnostic reference level (DRL), and the results are fed back to each facility and the cause of the abnormal value is investigated for dose optimization. Medical information collected 139 144 tests from 33 CT devices in 13 facilities. Although the DRL of this study is lower than that of Japan DRL, it was higher than the DRL of each country...
February 7, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29360705/determination-of-examination-specific-diagnostic-reference-level-in-computed-tomography-by-a-new-quality-control-based-dose-survey-method
#14
Masoumeh Parsi, Mehdi Sohrabi, Fereidoun Mianji, Reza Paydar
A new "quality-control-based (QC-based) dose survey method" has been developed for determination of diagnostic reference levels (DRL) in Computed Tomography (CT) examinations. The "QC-based dose survey method" is based on the use of retrospective data in the QC documents and reports, which are typically available from the National Regulatory Authority database. The method was applied to 70 CT scanners in Tehran, Iran, by using the available QC reports from the database. The commonly used "data collection method" was also applied by filling each questionnaire on-site to validate the new method...
March 2018: Health Physics
https://www.readbyqxmd.com/read/29353838/-7-drl-for-interventional-radiology-examination
#15
Hideyuki Kato
No abstract text is available yet for this article.
2018: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/29351655/establishing-diagnostic-reference-levels-for-cardiac-computed-tomography-angiography-in-saudi-arabia
#16
Ali B Alhailiy, Peter L Kench, Mark F McEntee, Patrick C Brennan, Elaine A Ryan
Cardiac computed tomography angiography (CCTA) is a commonly used diagnostic imaging tool for cardiovascular disease. Despite constant improvements to imaging technologies, the radiation dose to patients remains a concern when using this procedure. Diagnostic reference levels (DRLs) are used as a trigger to identify and alert individual facilities that are using high doses during CT. This study aims to assess patient radiation dose and establish new national DRLs (NDRL) associated with CCTA in Saudi clinical practices...
January 17, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29342278/dosimetry-of-adult-and-pediatric-patients-for-common-digital-radiography-examinations
#17
Bhupendra Singh Rana, Sanjeev Kumar, Inderjeet Singh Sandhu, Narinder Paul Singh
The present work reports dosimetry data on adult and pediatric patients for some common radiographic examinations during the standard hospital routine. The measurements are the part of quality assurance program to determine radiation exposures to patients in these examinations. The entrance skin doses (ESDs) of the patients were measured from 2451 projection for 12 diagnostic examinations in digital radiography (DR). The ESDs in adult patient were measured using thermoluminescence dosemeters placed on the skin of the patient...
January 12, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29313972/the-role-of-signals-in-two-variations-of-differential-reinforcement-of-low-rate-procedures
#18
Jessica L Becraft, John C Borrero, Barbara J Davis, Amber E Mendres-Smith, Mariana I Castillo
Differential-reinforcement-of-low-rate (DRL) schedules are used to decrease the overall rate of, but not eliminate, a target response. Two variations of DRL, spaced-responding and full-session, exist. Preliminary comparative analyses suggest that the two schedules function differently when unsignaled. We compared response rates under these two DRL variations with and without signals. In Experiment 1, five preschool students played a game in which points were earned under DRL schedules. In some sessions, a stimulus signaled when responses would be reinforced (S+) or not reinforced (S-)...
January 2018: Journal of Applied Behavior Analysis
https://www.readbyqxmd.com/read/29281973/polymorphic-duplicate-genes-and-persistent-non-coding-sequences-reveal-heterogeneous-patterns-of-mitochondrial-dna-loss-in-salamanders
#19
Rebecca A Chong, Rachel Lockridge Mueller
BACKGROUND: Mitochondria are the site of the citric acid cycle and oxidative phosphorylation (OXPHOS). In metazoans, the mitochondrial genome is a small, circular molecule averaging 16.5 kb in length. Despite evolutionarily conserved gene content, metazoan mitochondrial genomes show a diversity of gene orders most commonly explained by the duplication-random loss (DRL) model. In the DRL model, (1) a sequence of genes is duplicated in tandem, (2) one paralog sustains a loss-of-function mutation, resulting in selection to retain the other copy, and (3) the non-functional paralog is eventually deleted from the genome...
December 28, 2017: BMC Genomics
https://www.readbyqxmd.com/read/29279172/using-diagnostic-reference-levels-to-evaluate-the-improvement-of-patient-dose-optimisation-and-the-influence-of-recent-technologies-in-radiography-and-computed-tomography
#20
Patrice Roch, David Célier, Cécile Dessaud, Cécile Etard
OBJECTIVES: Twelve years since the implementation of Diagnostic Reference Levels (DRL) process in France, the Nuclear Safety and Radiation Protection French Institute (IRSN) presents its latest analyses performed on the most recent national data. METHODS: Statutorily, each year, medical imaging departments must perform patient exposure evaluation from their clinical practice for at least 2 types of radiographic and computed tomography (CT) examinations freely chosen in the regulatory list...
January 2018: European Journal of Radiology
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