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Farina Laura L Department of Information Engineering, Electronics and Telecommunications, Sapienza University of Rome , Italy - - 2014
Abstract Purpose: The aim of this study was to characterise changes in tissue volume during image-guided microwave ablation in order to arrive at a more precise determination of the true ablation zone. Materials and methods: The effect of power (20-80 W) and time (1-10 min) on microwave-induced tissue contraction was experimentally evaluated ...
Gudur Madhu Sudhan Reddy MS Department of Radiation Oncology, Stanford University, Palo Alto, CA-94043, - - 2014
MRI significantly improves the accuracy and reliability of target delineation in radiation therapy for certain tumors due to its superior soft tissue contrast compared to CT. A treatment planning process with MRI as the sole imaging modality will eliminate systematic CT/MRI co-registration errors, reduce cost and radiation exposure, and simplify ...
Euler A A Clinic of Radiology and Nuclear Medicine, University of Basel Hospital, Petersgraben 4, 4031, Basel, - - 2014
To compare image quality and low-contrast detectability of an integrated circuit (IC) detector in abdominal CT of obese patients with conventional detector technology at low tube voltages. A liver phantom with 45 lesions was placed in a water container to mimic an obese patient and examined on two different CT ...
Li Wei W Department of Medical Imaging, Qianfoshan Hospital affiliated to Shandong University, Jinan, PR - - 2014
Because pelvic computed tomography (CT) is widely used in clinical practice, there are increasing concerns regarding the associated risks of radiation-induced cancer. Therefore, the capability to reduce the CT radiation dose without compromising image quality is desirable. To assess the radiation dose and image quality of adult pelvic CT using ...
Woolf Steven H SH Department of Family Medicine and Population Health, Virginia Commonwealth University, - - 2014
In 2013, the US Preventive Services Task Force (USPSTF) recommended low-dose computed tomographic (CT) screening for high-risk current and former smokers with a B recommendation (indicating a level of certainty that it offered moderate to substantial net benefit). Under the Affordable Care Act, the USPSTF recommendation requires commercial insurers to ...
Berger Ferco H FH Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam, The Netherlands, - - 2014
To avoid detection at border crossings or airport customs, drug trafficking is increasingly performed by intra-corporeal concealment. Body packers may ingest packets of varying size and containing varying drugs (mostly cocaine, heroin and cannabis) mixed with other compounds, while body pushers will insert packets in the rectum or vaginal cavity. ...
Wang Jun J Faculty of Medicine, University of British Columbia, Vancouver, V5Z 1M9, Canada, - - 2014
The objective of this study is to establish the effect of third-generation integrated circuit (IC) CT detector on objective image quality in full- and half-dose non-contrast CT of the urinary tract. 51 consecutive patients with acute renal colic underwent non-contrast CT of the urinary tract using a 128-slice dual-source CT ...
Keegan Jennifer J Cardiovascular Biomedical Research Unit, Royal Brompton and Harefield NHS Foundation Trust, - - 2014
Like X-Ray contrast angiography, MR coronary angiograms show the vessel lumens rather than the vessels themselves. Consequently, outward remodeling of the vessel wall, which occurs in subclinical coronary disease before luminal narrowing, cannot be seen. The current gold standard for assessing the coronary vessel wall is intravascular ultrasound, and more ...
Kalender Willi A WA Institute of Medical Physics, University of Erlangen-Nürnberg, Germany. Electronic address: - - 2014
The estimation of patient dose using Monte Carlo (MC) simulations based on the available patient CT images is limited to the length of the scan. Software tools for dose estimation based on standard computational phantoms overcome this problem; however, they are limited with respect to taking individual patient anatomy into ...
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 ...
Wylie Matthew C MC From the *Section of Pediatric Emergency Medicine, Department of Emergency Medicine, Hasbro Children's Hospital/Alpert School of Medicine at Brown University; †Section of Emergency Medicine, Department of Epidemiology, Brown University, Providence, RI; and ‡Department of Pediatrics, Dartmouth-Hitchcock Medical Center, Lebanon, - - 2014
Computed tomography (CT) is the standard for immediate imaging of head-injured children, but it uses radiation that predisposes to malignancy. The study goals were to describe imaging practices in this population and to identify barriers to rapid magnetic resonance imaging (MRI) use. A cross-sectional survey of physicians who care for ...
Makris N E NE Department of Radiology and Nuclear Medicine, VU University Medical Center, Amsterdam 1081HZ, The - - 2014
Increasing interest in immuno-positron emission tomography (PET) studies requires development of dosimetry methods which will provide accurate estimations of organ absorbed doses. The purpose of this study is to develop and validate simplified dosimetry approaches for (89)Zirconium-PET (Zr-PET)/computed tomography (CT) studies. Five patients with advanced colorectal cancer received 37.1 ± ...
Westra Sjirk J SJ Division of Pediatric Radiology, Massachusetts General Hospital, 34 Fruit St., White 246A, Boston, MA, 02114, USA, - - 2014
In order to personalize the communication of the CT risk, we need to describe the risk in the context of the clinical benefit of CT, which will generally be much higher, provided a CT scan has a well-established clinical indication. However as pediatric radiologists we should be careful not to ...
Westra Sjirk J SJ Division of Pediatric Radiology, Massachusetts General Hospital, 34 Fruit St., White 246A, Boston, MA, 02114, USA, - - 2014
The theory of radiation carcinogenesis has been debated for decades. Most estimates of the radiation risks from CT have been based on extrapolations from the lifespan follow-up study of atomic bomb survivors and on follow-up studies after therapeutic radiation, using the linear no-threshold theory. Based on this, many population-based projections ...
Goske Marilyn J MJ Department of Radiology, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave., Cincinnati, OH, 45229-3039, USA, - - 2014
CT scans are powerful tools used in the care of pediatric patients daily. Yet the increased use of CT warrants careful monitoring. This article defines diagnostic reference levels and how they can be used to guide practice. Once a facility has adapted its techniques and protocols to fall within diagnostic ...
Larson David B DB Department of Radiology, Stanford University School of Medicine, 300 Pasteur Drive, Stanford, CA, 94305-5105, USA, - - 2014
The principle of ALARA (dose as low as reasonably achievable) calls for dose optimization rather than dose reduction, per se. Optimization of CT radiation dose is accomplished by producing images of acceptable diagnostic image quality using the lowest dose method available. Because it is image quality that constrains the dose, ...
Samei Ehsan E Carl E. Ravin Advanced Imaging Laboratories (RAI Labs), Duke Clinical Imaging Physics Group, Departments of Radiology, Medical Physics, Physics, Biomedical Engineering, and Electrical and Computer Engineering, Duke University, 2424 Erwin Road, Suite 302, Durham, NC, 27705, USA, - - 2014
With the increased importance of CT radiation dose to health care providers, patients and the general public, there is an increased responsibility to minimize patient dose effectively. Bismuth shields offer a simple strategy to reduce dose to certain anterior radiosensitive organs such as breasts and eyes. However, in order to ...
Singh Sarabjeet S Department of Radiology, Massachusetts General Hospital, Harvard Medical School, 55 Fruit St., Founders 202, Boston, MA, 02114, USA, - - 2014
Radiation dose associated with CT is an important safety concern in patient care, especially in children. Technical advancements in multidetector-row CT scanner technology offer several advantages for clinical applications; these advancements have considerably increased CT utilization and enhanced the complexity of CT scanning protocols. Furthermore there are several scan manufacturers ...
Frush Donald P DP Department of Radiology, Duke University Medical Center, Box 3808, Erwin Road, Durham, NC, 27710, USA, - - 2014
Many technical advances in CT have reduced radiation exposure in children and adults. These advances in technology should be used in conjunction with CT techniques such as appropriate patient preparation and intravenous contrast media administration to maximize dose management and image quality. This article summarizes current dose reduction technologies for ...
Slovis Thomas L TL Department of Radiology, Wayne State University School of Medicine, Children's Hospital of Michigan, 3901 Beaubien Blvd., Detroit, MI, 48201, USA, - - 2014
Most pediatric CT examinations (as many as 85%) are performed at non-pediatric-focused facilities. In contrast to children's hospitals and pediatric emergency departments, the number of CT examinations is increasing at these non-pediatric facilities. Compliance with diagnostic reference levels (DRLs) for dose has been shown to be poor at several metropolitan ...
Litmanovich Diana E DE From the Department of Radiology, Beth Israel Deaconess Medical Center, 330 Brookline Ave, Shapiro 4, Boston, MA 02215 (D.E.L., M.S., A.A.B.); and Department of Radiology, Epicura Hospital, Baudour, Belgium - - 2014
Radiation exposure from computed tomography (CT) has received much attention lately in the medical literature and the media, given the relatively high radiation dose that characterizes a CT examination. Although there are a variety of possible strategies for reducing radiation exposure from CT in an individual patient, optimal CT image ...
Yokomachi Kazushi K Department of Diagnostic Radiology, Hiroshima - - 2014
For emergency or pediatric head CT scans, a simplified pillow made of hard sponge instead of a dedicated head holder may be used if it is difficult to immobilize the head. However, the radiation dose when using a simplified head holder may be increased due to radiation absorption by the ...
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 ...
Kim Dong-Soo DS Department of Oral and Maxillofacial Radiology, Dankook University College of Dentistry, Cheonan, - - 2014
[This corrects the article on p. 21 in vol. 44, PMID: 24701455.].
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 ...
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