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Kordolaimi Sofia D SD 1 Second Department of Radiology, Medical School, University of Athens, 1 Rimini Str, 12462 Haidari, Athens, - - 2014
OBJECTIVE. The purpose of this study is to introduce an efficient method for the optimization of iterative reconstruction CT protocols based on phantom image analysis and the comparison of obtained results with actual patient data. MATERIALS AND METHODS. We considered chest, abdomen, and pelvis CT examinations before the installation of ...
Yoon Haesung H Department of Radiology and Research Institute of Radiological Science, Severance Children's Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, Republic of - - 2014
New CT reconstruction techniques may help reduce the burden of ionizing radiation. To quantify radiation dose reduction when performing pediatric chest CT using a low-dose protocol and 50% adaptive statistical iterative reconstruction (ASIR) compared with age/gender-matched chest CT using a conventional dose protocol and reconstructed with filtered back projection (control ...
Cho Jae-Hwan JH Department of International Radiological Science, Hallym University of Graduate Studies, Seoul, Republic of Korea, - - 2014
The purpose of this study was to use various radiation-permeable and radiation-impermeable materials, used to facilitate the observation of a lesion during a rectal computed tomography (CT) scan, in order to determine the best material to use. In regard to the study method, the radiation-permeable and radiation-impermeable materials of physiological ...
Busser Wendy M H WM Department of Radiology, Section of Interventional Radiology, Radboud University Medical Center, Internal postal code 766, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands, - - 2014
We assessed whether image registration of cone-beam computed tomography (CT) (CBCT) and contrast-enhanced CT (CE-CT) images indicating the locations of the adrenal veins can aid in increasing the success rate of first-attempts adrenal vein sampling (AVS) and therefore decreasing patient radiation dose. CBCT scans were acquired in the interventional suite ...
Dyk Pawel P Department of Radiation Oncology, St Louis, - - 2014
Magnetic resonance imaging/diffusion weighted-imaging (MRI/DWI)-guided high-dose-rate (HDR) brachytherapy and (18)F-fluorodeoxyglucose (FDG) - positron emission tomography/computed tomography (PET/CT)-guided intensity modulated radiation therapy (IMRT) for the definitive treatment of cervical cancer is a novel treatment technique. The purpose of this study was to report our analysis of dose-volume parameters predicting gross tumor ...
Smith-Bindman Rebecca R From the Departments of Radiology and Biomedical Imaging (R.S.-B., R.B.G., M. Moghadassi), Epidemiology and Biostatistics and the Philip R. Lee Institute for Health Policy Studies (R.S.-B.), Urology (M.L.S.), Medicine (V.E.V.), and Emergency Medicine (R.C.W.), University of California, San Francisco (UCSF), and the San Francisco Coordinating Center, California Pacific Medical Center Research Institute (D.R.K., S.R.C.), San Francisco, the Department of Emergency Medicine, UCSF, Fresno (R.N.B.), Keck School of Medicine of the University of Southern California, Los Angeles (T.L.K.), Center for Healthcare Policy and Research (J.M.) and Division of Biostatistics, Department of Public Health Sciences (D.L.M.) and the Department of Emergency Medicine (L.D.M.), University of California, Davis - all in California; the Division of Emergency Medicine, Washington University School of Medicine, St. Louis (C.A., R.T.G.); Department of Emergency Medicine, John H. Stroger, Jr. Hospital of Cook County, and the Department of Emergency Medicine, Rush University Medical Center - both in Chicago (J.B.); Department of Emergency Medicine, Massachusetts General Hospital and Harvard Medical School, Boston (C.A.C., V.E.N.); Department of Emergency Medicine, Jacobi Medical Center, Bronx, NY (J.C., J.W.); Department of Emergency Medicine, Hospital of the University of Pennsylvania, Philadelphia (A.J.D.); Rhode Island Hospital and Brown University Department of Emergency Medicine, Providence (G.D.J.); Department of Emergency Medicine, Oregon Health and Science University, Portland (O.J.M.); and Group Health Research Institute, Group Health Cooperative, Seattle (D.L.M.); University of Utah, Salt Lake City (M. Mallin); Emory University School of Medicine, Atlanta (W.M.); University of Texas Health Science Center at Houston (S.K.M.) and the University of Texas at Houston Medical School (G.M.P.) - both in Houston; and the Hennepin County Medical Center, Minneapolis - - 2014
Background There is a lack of consensus about whether the initial imaging method for patients with suspected nephrolithiasis should be computed tomography (CT) or ultrasonography. Methods In this multicenter, pragmatic, comparative effectiveness trial, we randomly assigned patients 18 to 76 years of age who presented to the emergency department with ...
Heyer Christoph M CM Institute of Diagnostic Radiology, Interventional Radiology and Nuclear Medicine, Berufsgenossenschaftliches Universitaetsklinikum Bergmannsheil, Ruhr-University of Bochum, Bürkle-de-la-Camp Platz 1, D-44789 Bochum, Germany. Electronic address: - - 2014
Prospective evaluation of anxiety in patients undergoing computed tomography (CT) imaging using a standardized state-trait anxiety inventory (STAI-S) and identification of possible risk factors. During a 9-month interval, patients undergoing CT were questioned using STAI-S. Additionally, 10 questions concerning specific procedure-related features (claustrophobia, radiation, administration of contrast, and so forth) ...
Lück Ferdinand F Institute of Medical Physics, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany. CT Imaging GmbH, Erlangen, - - 2014
The purpose of this study was to validate the use of a single shaped filter (SF) for computed tomography (CT) using variable source-to-filter distance (SFD) for the examination of different object diameters.A SF was designed by performing simulations with the purpose of achieving noise homogeneity in the reconstructed volume and ...
Abdullah Basri Johan Jeet BJ Department of Biomedical Imaging and University of Malaya Research Imaging Centre, Faculty of Medicine, University of Malaya, 50603, Kuala Lumpur, Malaysia, - - 2014
This study aimed to assess the technical success, radiation dose, safety and performance level of liver thermal ablation using a computed tomography (CT)-guided robotic positioning system. Radiofrequency and microwave ablation of liver tumours were performed on 20 patients (40 lesions) with the assistance of a CT-guided robotic positioning system. The ...
Korn Andreas A Department of Diagnostic und Interventional Neuroradiology, University of Tübingen, Tübingen, - - 2014
A new computed tomography (CT) detector with integrated electric components and shorter conducting pathways has recently been introduced to decrease system inherent electronic noise. The purpose of this study was to assess the potential benefit of such integrated circuit detector (ICD) in head CT by comparing objective and subjective image ...
Kim In I From the Department of Pediatric Emergency Medicine, New York University Langone Medical Center, New York, - - 2014
The rapid growth of computed tomography (CT) has resulted in increased concerns of ionizing radiation exposure and its subsequent risk of cancer development. We evaluated the impact of a new protocol using rapid sequence magnetic resonance imaging (rsMRI) instead of CT in children presenting with possible ventriculoperitoneal shunt (VPS) malfunction ...
Naganuma Makoto M Center for Diagnostic and Therapeutic Endoscopy, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, - - 2014
Magnetic resonance enterography (MRE) has been reported to be a useful modality for the evaluation of luminal inflammation and extraintestinal complications in Crohn's disease (CD). A recent study indicated that the diagnostic ability of MRE was comparable to the diagnostic ability of other devices, such as ileocolonoscopy. MRE can be ...
Chen Jenny X JX Harvard Medical School, Boston, Massachusetts, - - 2014
Computed tomography (CT) has been used in the assessment of pediatric hearing loss, but concern regarding radiation risk and increased utilization of magnetic resonance imaging (MRI) have prompted us toward a more quantitative and sophisticated understanding of CT's potential diagnostic yield. To perform a systematic review to analyze the diagnostic ...
Shuman William P WP 1 All authors: Department of Radiology, University of Washington School of Medicine, Box 357115, 1959 NE Pacific St, Seattle, WA - - 2014
OBJECTIVE. The purpose of this study was to evaluate the effect of use of dual-energy CT monochromatic imaging in the late hepatic arterial phase on hyperenhancing focal lesion detection and lesion conspicuity. SUBJECTS AND METHODS. This prospective study included 72 patients imaged with a single-source dual-energy CT scanner. Late arterial ...
Yang Ching-Ching CC Department of Medical Imaging and Radiological Sciences, Tzu-Chi College of Technology, 970, Hualien, - - 2014
This study aimed to tailor the CT imaging protocols for pediatric patients undergoing whole-body PET/CT examinations with appropriate attention to radiation exposure while maintaining adequate image quality for anatomic delineation of PET findings and attenuation correction of PET emission data. The measurements were made by using three anthropomorphic phantoms representative ...
Fuentes-Orrego Jorge M JM From the Division of Abdominal Imaging and Intervention, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, 55 Fruit St, Boston, MA - - 2014
Computed tomographic (CT) angiography has become the standard of care, supplanting invasive angiography for comprehensive initial evaluation of acute and chronic conditions affecting the vascular system in the abdomen and elsewhere. Over the past decade, the capabilities of CT have improved substantially; simultaneously, the expectations of the referring physician and ...
Ahn Justin S - - 2014
ABSTRACTObjective:To assess the current level of knowledge and practice patterns of emergency physicians regarding radiation exposure from diagnostic imaging modalities for investigating acute pulmonary embolism (PE). An online survey was sent to adult emergency physicians working at two academic tertiary care adult emergency departments (EDs) to determine imaging choices for ...
Li Jing-Lei JL Southern Medical University, Guangdong Academy of Medical Sciences, Guangdong General Hospital, Guangzhou, P.R. - - 2014
We aimed to determine a potentially optimal body size index for adjusting the tube current in retrospective ECG-triggered helical 256-slice CT coronary angiography (CTCA) for individualized radiation dose control. Consecutive patients (n=102) with suspected coronary artery disease underwent retrospective ECG-triggered CTCA with a 256-slice CT scanner. Body mass index (BMI), ...
Tchouala Nofiele Joris - - 2014
AbstractThe lung remains one of the most challenging organs to image using magnetic resonance imaging (MRI) due to intrinsic rapid signal decay. However, unlike conventional modalities such as computed tomography, MRI does not involve radiation and can provide functional and morphologic information on a regional basis. Here we demonstrate proof ...
Penzkofer Tobias - - 2014
To investigate the impact of high pitch cardiac CT vs. retrospective ECG gated CT on the quantification of calcified vessel stenoses, with assessment of the influence of tube voltage, reconstruction kernel and heart rate. A 4D cardiac movement phantom equipped with three different plaque phantoms (12.5%, 25% and 50% stenosis ...
McNally Michael M MM Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, University of Florida College of Medicine, Gainesville, - - 2014
Endovascular surgery has revolutionized the treatment of aortic aneurysms; however, these improvements have come at the cost of increased radiation and contrast exposure, particularly for more complex procedures. Three-dimensional (3D) fusion computed tomography (CT) imaging is a new technology that may facilitate these repairs. The purpose of this analysis was ...
Liu Baodong B Baodong Liu, Miguel Ramalho, Mamdoh AlObaidy, Kiran K Busireddy, Ersan Altun, Janaka Kalubowila, Richard C Semelka, Department of Radiology, University of North Carolina at Chapel Hill, North Carolina, NC 27599-7510, United - - 2014
Over the past two decades, advances in cross-sectional imaging such as computed tomography and magnetic resonance imaging (MRI) have dramatically changed the concept of gastrointestinal imaging. MR is playing an increasing role in the evaluation of gastrointestinal disorders. MRI combines the advantages of excellent soft-tissue contrast, noninvasiveness, functional information and ...
Santyr Giles G Imaging Research Laboratories, Robarts Research Institute, Western University, London, Ontario, Canada; Department of Medical Biophysics, Western University, London, Ontario, Canada; Department of Medical Imaging, Western University, London, Ontario, Canada; Peter Gilgan Centre for Research and Learning, The Hospital for Sick Children, Toronto, Ontario, - - 2014
MRI of hyperpolarized (129) Xe gas and (13) C-enriched substrates (e.g. pyruvate) presents an unprecedented opportunity to map anatomical, functional and metabolic changes associated with lung injury. In particular, inhaled hyperpolarized (129) Xe gas is exquisitely sensitive to changes in alveolar microanatomy and function accompanying lung inflammation through decreases in ...
Markic Goran G *Clinic for Orthodontics and Paediatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, - - 2014
Summary Background/Objectives: To compare different imaging procedures [cone beam computed tomography (CBCT), computed tomography (CT), magnetic resonance imaging (MRI), orthopantomography (OPG), and lateral cephalometry (LC)] for assessing the mandibular height [ramus height (RH)] and condylar process (CondProc) length as they reflect mandibular growth. Materials/Methods: The RH and CondProc of eight ...
Mashouf S S Medical Biophysics Department, University of Toronto, 2075 Bayview Avenue, Toronto, ON M4N3M5, - - 2014
Permanent seed implant brachytherapy is currently used for adjuvant radiotherapy of early stage prostate and breast cancer patients. The current standard for calculation of dose around brachytherapy sources is based on the AAPM TG-43 formalism, which generates the dose in a homogeneous water medium. Recently, AAPM TG-186 emphasized the importance ...
Osti Michael M Department for Trauma Surgery and Sports Traumatology, Academic Hospital Feldkirch, Carinagasse 47, 6800, Feldkirch, Austria, - - 2014
Intra- and postoperative validation of anatomic footprint replication in posterior cruciate ligament (PCL) reconstruction can be conducted using fluoroscopy, radiography, or computed tomography (CT) scans. However, effectiveness and exposure to radiation of these imaging modalities are unknown. The objective of this study was to evaluate the comparative effectiveness of fluoroscopy, ...
Pan Yuxi Y Department of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China. Key Laboratory of Particle & Radiation Imaging (Tsinghua University) Ministry of Education, Beijing 100084, People's Republic of - - 2014
With the rapidly growing number of CT examinations, the consequential radiation risk has aroused more and more attention. The average dose in each organ during CT scans can only be obtained by using Monte Carlo simulation with computational phantoms. Since children tend to have higher radiation sensitivity than adults, the ...
Ryan Maura E ME Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois. Electronic address: - - 2014
Head trauma is a frequent indication for cranial imaging in children. CT is considered the first line of study for suspected intracranial injury because of its wide availability and rapid detection of acute hemorrhage. However, the majority of childhood head injuries occur without neurologic complications, and particular consideration should be ...
Richter Christian C OncoRay - National Center of Radiation Research in Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany; Department of Radiation Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany; Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany; German Cancer Consortium (DKTK), Dresden, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany. Electronic address: - - 2014
Liver irradiation leads to a decreased uptake of a hepatobiliary directed MRI contrast agent (Gd-EOB-DTPA) as shown in studies performed 1-6months after proton therapy, stereotactic ablative body radiation therapy and brachytherapy. Therefore, Gd-EOB-DTPA enhanced MRI could potentially be used for in vivo verification of the delivered dose distribution. Achieving this ...
Lehmann Sylvia - - 2014
Abstract Electrical impedance tomography (EIT) is a radiation-free technique generating cross-sectional images of the lung. EIT visualizes global and regional ventilation by illustrating the distribution of electrical bioimpedance. With an electrode belt around the patient's thorax, rotating injection-couples of a harmless alternating current allow voltage measurement of the remaining electrodes. ...
Danly C R CR Los Alamos National Laboratory, Los Alamos, New Mexico 87544, - - 2014
We present data that indicate nonuniform magnetization loss due to radiation damage in neodymium-iron-boron Halbach-style permanent magnet quadrupoles. The proton radiography (pRad) facility at Los Alamos uses permanent-magnet quadrupoles for magnifying lenses, and a system recently commissioned at GSI-Darmsdadt uses permanent magnets for its primary lenses. Large fluences of spallation ...
Raju Rekha R Department of Radiology and Division of Cardiology, St Paul's Hospital, 1081 Burrard Street, Vancouver V6Z 1Y6, BC, - - 2014
There is concern regarding the administration of iodinated contrast to patients with impaired renal function because of the increased risk of contrast-induced nephropathy. Evaluate image quality and feasibility of a protocol with a reduced volume of iodinated contrast and utilization of dual-energy coronary CT angiography (DECT) vs a standard iodinated contrast ...
Ebner Lukas L Department of Diagnostic, Interventional and Pediatric Radiology, Inselspital, Bern University Hospital, Freiburgstrasse, Bern, - - 2014
The aim of the present study was to evaluate a dose reduction in contrast-enhanced chest computed tomography (CT) by comparing the three latest generations of Siemens CT scanners used in clinical practice. We analyzed the amount of radiation used with filtered back projection (FBP) and an iterative reconstruction (IR) algorithm ...
Yamashiro Tsuneo T Department of Radiology, Graduate School of Medical Science, University of the Ryukyus, Nishihara, Okinawa, - - 2014
To assess the advantages of Adaptive Iterative Dose Reduction using Three Dimensional Processing (AIDR3D) for image quality improvement and dose reduction for chest computed tomography (CT). Institutional Review Boards approved this study and informed consent was obtained. Eighty-eight subjects underwent chest CT at five institutions using identical scanners and protocols. ...
Fukuda Atsushi A Shiga Medical Center for Children. - - 2014
The purpose of this study was to develop and evaluate a simple method to assess gantry rotation overrun in a single axial CT scanning. The exposure time in the axial scanning was measured at selected nominal rotation times (400, 700, and 1000 ms) using a solid-state detector, the RTI's CT ...
Li Qilin Q The First People's Hospital of Changzhou City. - - 2014
Two patients with multiple lung metastases (≥ 5) were treated using frameless stereotactic body radiation therapy (SBRT) on an Elekta Axesse linear accelerator equipped with an interdigitation-capable multileaf collimator and four-dimensional cone-beam CT (4D CBCT). The technique and the early clinical outcomes were evaluated. Patient A with five lung metastases ...
Muenzel Daniela D Department of Radiology, Technische Universitaet Muenchen, Munich, - - 2014
Evaluation of a new software tool for generation of simulated low-dose computed tomography (CT) images from an original higher dose scan. Original CT scan data (100 mAs, 80 mAs, 60 mAs, 40 mAs, 20 mAs, 10 mAs; 100 kV) of a swine were acquired (approved by the regional governmental commission ...
Lange Catharina C Department of Nuclear Medicine, Charité - Universitätsmedizin Berlin, Berlin, - - 2014
Attenuation correction (AC) based on low-dose computed tomography (CT) could be more accurate in brain single-photon emission computed tomography (SPECT) than the widely used Chang method, and, therefore, has the potential to improve both semi-quantitative analysis and visual image interpretation. The present study evaluated CT-based AC for dopamine transporter SPECT ...
Kong Vickie V Radiation Medicine Program, Princess Margaret Cancer Center, Toronto, Canada. Electronic address: - - 2014
Image guided radiation therapy (IGRT) using bony anatomy for bladder cancer requires the use of large population-based planning target volume (PTV) margins to compensate for geometric uncertainties. This may result in a large volume of normal tissue being irradiated unnecessarily. Identification of the clinical target volume (CTV) is also a ...
Wysocka Barbara B Department of Radiation Oncology, Princess Margaret Cancer Centre, University of Toronto, Toronto, Ontario, - - 2014
To characterize nonrespiratory stomach motion in the fasting state and postprandial. Ten healthy volunteers underwent 2-dimensional Fiesta cine magnetic resonance imaging studies in 30-second voluntary breath hold, in axial, coronal, and 2 oblique planes while fasting, and 5, 15, 30, 45, and 60 minutes postmeal. Each stomach contour was delineated ...
Singh Divya D Divya Singh, Ashu Seith Bhalla, Prasad Thotton Veedu, Arundeep Arora, Department of Radiodiagnosis, All India Institute of Medical Sciences, New Delhi 110029, - - 2013
Hemoptysis is an uncommon but distressing symptom in children. It poses a diagnostic challenge as it is difficult to elicit a clear history and perform thorough physical examination in a child. The cause of hemoptysis in children can vary with the child's age. It can range from infection, milk protein ...
Lohrmann Christian - - 2013
The aim of this study was to determine the impact of high-resolution cone-beam CT with flat-panel detectors on the interpretation of bone SPECT in diseases of the peripheral skeleton. METHODS: Forty-one consecutive patients with peripheral skeletal disease were examined with a SPECT/high-resolution CT system providing isotropic voxels of 0.33 × ...
Yakovlev Vladislav V - - 2013
Optical sensors for ultrasound detection provide high sensitivity and bandwidth, essential for photoacoustic imaging in clinical diagnostics and biomedical research. Implementing plasmonic metamaterials in a non-resonant regime facilitates sub-nanosecond, highly sensitive detectors while eliminating cumbersome optical alignment necessary for resonant sensors.
Reyngoudt Harmen - - 2012
Objective: To summarize and evaluate proton ((1)H) and phosphorus ((31)P) magnetic resonance spectroscopy (MRS) findings in migraine.Methods: A thorough review of (1)H and/or (31)P-MRS studies in any form of migraine published up to September 2011.Results: Some findings were consistent in all studies, such as a lack of ictal/interictal brain pH ...
Kim Dong-Yeon - - 2012
INTRODUCTION: Established radiotracers for positron emission tomography (PET) myocardial perfusion study are commonly labeled with short-lived radio-isotopes that limit their widespread clinical use. Thus, we synthesized (2-(2-[(18)F]fluoroethoxy)ethyl)tris(4-methoxyphenyl)phosphonium salt ([(18)F]FETMP) as a novel myocardial perfusion agent that penetrates the hydrophobic barriers of the plasma and mitochondrial membranes and accumulate in mitochondria ...
Yeh Hsu-Ling - - 2012
Hypoperfusion on single-photon emission computed tomography (SPECT) of the stroke-like lesion (SLL) at the hyperacute stage of mitochondrial encephalopathy with lactic acidosis and stroke-like episodes (MELAS) is considered to be a supportive evidence of the mitochondrial angiopathy theory. Our objectives were to examine whether other neuroimages, especially transcranial color-coded sonography ...
Steenweg Marjan E ME VU University Medical Centre, De Boelelaan 1117, Amsterdam, The Netherlands. - - 2012
In the large group of genetically undetermined infantile-onset mitochondrial encephalopathies, multiple defects of mitochondrial DNA-related respiratory-chain complexes constitute a frequent biochemical signature. In order to identify responsible genes, we used exome-next-generation sequencing in a selected cohort of patients with this biochemical signature. In an isolated patient, we found two mutant ...
Lai M M Y - - 2012
Background:  Computed tomography (CT) of the brain in delirium investigation has a low yield of identifiable causes. We sought to identify the best clinical predictors of an intracranial cause of delirium. Methods:  We performed a case-control study of patients admitted to a delirium unit. Clinical factors of patients with positive ...
Mafi John N - - 2012
Cardiovascular disease is the leading cause of global mortality, yet its early detection remains a vexing problem of modern medicine. Although the computed tomography (CT) calcium score predicts cardiovascular risk, relatively high cost ($250-400) and radiation dose (1-3 mSv) limit its universal utility as a screening tool. Dual-energy digital subtraction ...
Furuki Misako - - 2012
We report the case of a 50-year-old man with subacute onset of bilateral visual field loss and visual acuity loss. His visual acuity was 0.07 OD/0.09 OS and Goldmann perimetry showed central scotomas. The optic fundi were normal bilaterally. Magnetic resonance imaging (MRI) showed hyperintensity in the right optic nerve ...
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