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Sanz Enrique E Urology Department, Hospital Universitario Ramón y Cajal, Alcalá University, Madrid, - - 2015
Strict imaging follow-up is mandatory after cryoablation of small renal masses (SRMs). Although it uses ionizing radiation and nephrotoxic iodinated contrast, computed tomography (CT) is still the gold standard test. Contrast-enhanced ultrasound (CEUS) is a novel technique that informs in real time about renal perfusion avoiding radiation and nephrotoxicity. The ...
Kang Stella K SK 1 Department of Radiology, NYU Langone Medical Center, 550 First Ave, New York, NY - - 2014
OBJECTIVE. The objective of this study was to quantify the effects of radiation-induced cancer risks in patients with Bosniak category IIF lesions undergoing CT versus MRI surveillance. MATERIALS AND METHODS. We developed a Markov-Monte Carlo model to determine life expectancy losses attributable to radiation-induced cancers in hypothetical patients undergoing CT ...
Kim Edward E 1 Department of Interventional Radiology, Mount Sinai Medical Center, One Gustave L. Levy Pl, Box 1234, New York, NY - - 2014
OBJECTIVE. The purpose of this study is to evaluate the effectiveness of electromagnetic tracking in assisting CT-guided liver biopsies. MATERIALS AND METHODS. This was a single-center prospective randomized controlled trial comparing nonfluoroscopic CT-guided liver biopsy using an advance-and-scan technique with and without electromagnetic tracking. Fifty patients with a liver lesion ...
Zhang Min M School of Computing, Informatics Decisions and System Engineering, Arizona State University, Tempe, AZ, - - 2014
Excessive cephalocaudal anatomic (Z-axis) coverage can lead to unnecessary radiation exposure to a patient. In this study, an automated computing model was developed for identifying instances of potentially excessive Z-axis coverage with abdomen-pelvis examinations. Eight patient and imaging attributes including patient gender, age, height, weight, volume CT dose index (CTDIvol), ...
Valeri Gianluca G Clinical Radiology, AOU Ospedali Riuniti, Ancona, Italy, - - 2014
This study was done to evaluate the appropriateness of dose indices in computed tomography (CT) by comparing the body computed tomography dose index (CTDI) and the size-specific dose estimates (SSDE) to determine which of these two parameters is more appropriate to estimate the radiation dose to both adult and paediatric ...
Farmakis Shannon G SG Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S. Kingshighway Blvd., St. Louis, MO, 63110, - - 2014
Magnetic resonance (MR) angiography has significantly reduced the need for diagnostic conventional angiography and is preferred over CT angiography in children because of its lack of ionizing radiation. The availability of gadofosveset trisodium (the only clinically approved blood pool MR contrast agent) has led to an increase in applications of ...
Kim Moon Chan MC Department of Radiology, Samsung Medical Center, Seoul, - - 2014
14 620 sets of patient dose data were obtained for 31 different models of computed tomography (CT) equipment (total 73) with 18 types of CT examination in Korea. Specific diagnostic reference levels (DRLs) for this study in terms of third quartile volumetric CT dose index in mGy [and dose-length product ...
Midgley S M SM School of Physics, Monash University, Clayton, Victoria 3080, Australia. William Buckland Radiotherapy Centre, Alfred Hospital, Melbourne, VIC, 3181, - - 2014
A parametric model for the x-ray linear attenuation coefficient is used to describe the compositional dependence of Hounsfield numbers measured by medical CT scanners. Measurements with materials of known density and composition, that span and evenly sample the compositional range of tissues, are written as linear simultaneous equations and solved for ...
Kobayashi Masanao M Department of Radiology, Fujita Health University Hospital, Toyoake, Japan Graduate School of Medical Sciences, Division of Medical Sciences, Kanazawa University, Kanazawa, Japan - - 2014
The relationship between heart rate (HR) and computed tomography dose index (CTDI) was evaluated using an electrocardiogram (ECG) gate scan for scan applications such as prospective triggering, Ca scoring, target computed tomography angiography (CTA), prospective CTA and retrospective gating, continuous CTA/CFA (cardiac functional analysis) and CTA/CFA modulation. Even in the ...
Granata Claudio C Department of Radiology, IRCCS Istituto Giannina Gaslini, Largo Gaslini, 16147, Genoa, Italy, - - 2014
Multidetector CT (MDCT) scanners have contributed to the widespread use of CT in paediatric imaging. However, concerns are raised for the associated radiation exposure. Very few surveys on radiation exposure from MDCT studies in children are available. The aim of this study was to outline the status of radiation exposure ...
Cornelis F F Interventional Radiology Service, Department of Radiology, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY, 10065, - - 2014
To compare CT fluoroscopy-guided manual and CT-guided robotic positioning system (RPS)-assisted needle placement by experienced IR physicians to targets in swine liver. Manual and RPS-assisted needle placement was performed by six experienced IR physicians to four 5 mm fiducial seeds placed in swine liver (n = 6). Placement performance was assessed for placement ...
Kornerup Josefine S JS Section of Radiotherapy, Department of Oncology, Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark, - - 2014
PET/CT may be more helpful than CT alone for radiation therapy planning, but the added risk due to higher doses of ionizing radiation is unknown. To estimate the risk of cancer induction and mortality attributable to the [F-18]2-fluoro-2-deoxyglucose (FDG) PET and CT scans used for radiation therapy planning in children ...
Kim Young-Sun YS Department of Radiology and Centre for Imaging Science, Samsung Medical Centre, Sungkyunkwan University School of Medicine , Seoul , - - 2014
Abstract The clinical role of magnetic resonance image-guided high-intensity focused ultrasound (MR-HIFU) is rapidly expanding due to its merit of non-invasiveness. MR thermometry based on a proton resonance frequency shift technique is able to accurately measure HIFU-induced temperature changes, which provides considerable advantages over ultrasonography-guided HIFU in terms of safety ...
Zhang Jin-Ling JL Department of CT, The Second Affiliated Hospital of Harbin Medical University, Harbin, - - 2014
To investigate the image quality and radiation dose of combined coronary and carotid/cerebrovascular angiography with ECG gating and iterative reconstruction using 256-slice CT compared with the findings with the two examinations performed separately. One hundred sixty-five consecutive patients underwent a single-injection single-pass combination of coronary and carotid/cerebrovascular CT angiography (group ...
Gibson David - - 2014
BackgroundComputed tomography (CT) scanning is a relatively high radiation dose diagnostic imaging modality with increasing concerns about radiation exposure burden at the population level in scientific literature. This study examined the epidemiology of adult CT utilisation in Western Australia (WA) in both the public hospital and private practice settings, and ...
Suliman I I II Department of Radiology and Molecular Imaging, Medical Physics Section, College of Medicine and Health Sciences, Sultan Qaboos University, PO Box 35, 123 Al-Khod, Oman Sudan Atomic Energy Commission, Radiation Safety Institute, PO Box 3001, Khartoum, Sudan isuliman@squ.edu.om - - 2014
The purpose of this study was to assess the magnitude of radiation exposure during paediatric CT in Sudanese hospitals. Doses were determined from CT acquisition parameters using CT-Expo 2.1 dosimetry software. Doses were evaluated for three patient ages (0-1, 1-5 and 5-10 y) and two common procedures (head and abdomen). ...
Chemouni David D 1 Radiology Department, APHM, Hôpital Sainte Marguerite, 270 Blvd de Sainte Marguerite, 13009 Marseille, - - 2014
OBJECTIVE. The purpose of this study is to compare the diagnostic performance and radiation exposure of flat-panel CT arthrography for cartilage defect detection in the ankle joint to standard MDCT arthrography, using gross anatomy and thermoluminescent dosimetry as reference standards. MATERIALS AND METHODS. Ten cadaveric ankle specimens were obtained from ...
Vanderhave Kelly L - - 2014
Ultrasonography is an excellent adjunct to other musculoskeletal imaging tools utilized in the pediatric population and in some instances offers advantages over CT and MRI. It permits dynamic examination of anatomic structures and assists in guiding minimally invasive procedures. In the lower extremity, ultrasonography assists in screening for such disorders ...
Worrall James C - - 2014
ABSTRACTObjectives:Computed tomography (CT) use is increasing in the emergency department (ED). Many physicians are concerned about exposing patients to radiation from CT scanning, but estimates of radiation doses vary. This study's objective was to determine the radiation doses from CT scanning for common indications in a Canadian ED using modern ...
Brezovich Ivan A IA Department of Radiation Oncology, University of Alabama at Birmingham, Birmingham, Alabama - - 2014
Spatial accuracy is most crucial when small targets like the trigeminal nerve are treated. Although current quality assurance procedures typically verify that individual apparatus, like the MRI scanner, CT scanner, Gamma Knife, etc., are meeting specifications, the cumulative error of all equipment and procedures combined may exceed safe margins. This ...
Moteabbed M M Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts - - 2014
Magnetic resonance imaging (MRI) is a prime candidate for image-guided radiotherapy. This study was designed to assess the feasibility of real-time MRI-guided proton therapy by quantifying the dosimetric effects induced by the magnetic field in patients' plans and identifying the associated clinical consequences. Monte Carlo dose calculation was performed for ...
Li Xinhua X Division of Diagnostic Imaging Physics and Webster Center for Advanced Research and Education in Radiation, Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts - - 2014
The approach to equilibrium function has been used previously to calculate the radiation dose to a shift-invariant medium undergoing CT scans with constant tube current [Li, Zhang, and Liu, Med. Phys. 39, 5347-5352 (2012)]. The authors have adapted this method to CT scans with tube current modulation (TCM). For a ...
Niwa Shinji - - 2014
The performance of individual computed tomography automatic exposure control (CT-AEC) is very important for radiation dose reduction and image quality equalization in CT examinations. The purpose of this study was to evaluate the performance of CT-AEC in conventional pitch mode (Normal spiral) and fast dual spiral scan (Flash spiral) in ...
Jang Christina C School of Medicine, University of Queensland, Brisbane, Qld, Australia Department of Endocrinology and Diabetes, Princess Alexandra Hospital, Brisbane, Qld, - - 2014
PET-CT using (18)F-FDG is employed for detecting brown adipose tissue (BAT) in humans. Alternative methods are needed because of the radiation and cost of PET-CT imaging. The aim was to evaluate the accuracy of infrared thermography (IRT) in detecting human BAT benchmarked to PET-CT imaging. Seventeen individuals underwent a total ...
Sun Hao H Department of Radiology,PUMC Hospital,CAMS and PUMC,Beijing - - 2014
Objective To retrospectively evaluate the clinical feasibility of high-pitch excretory phase images during dual-source CT urography with Stellar photon detector. Methods Totally 100 patients received dual-source CT high-pitch urinary excretory phase scanning with Stellar photon detector[80 kV,ref.92 mAs,CARE Dose 4D and CARE kV,pitch of 3.0,filter back projection reconstruction algorithm (FBP)](group ...
Smith Martin P MP *Beth Israel Deaconess Medical Center, Boston, Massachusetts; †Winthrop-University Hospital, Mineola, New York; ‡Inland Imaging Associates and University of Washington, Seattle, Washington; §Virginia Commonwealth University Medical Center, Richmond, Virginia; ∥University of South Alabama, Mobile, Alabama, American Gastroenterological Association; ¶University of Wisconsin Hospital and Clinics, Madison, Wisconsin; #Hartford Hospital, Hartford, Connecticut, American College of Surgeons; **Emory University, Atlanta, Georgia; ††Vanderbilt University Medical Center, Nashville, Tennessee, Society of Nuclear Medicine; ‡‡Milton S. Hershey Medical Center, Hershey, Pennsylvania, Society of Nuclear Medicine; §§Northwestern University, Chicago, Illinois; ∥∥University of California San Francisco, San Francisco, California; and ¶¶University of Massachusetts Memorial Medical Center, Worcester, - - 2014
The most common cause of acute right lower quadrant (RLQ) pain requiring surgery is acute appendicitis (AA). This narrative's focus is on imaging procedures in the diagnosis of AA, with consideration of other diseases causing RLQ pain. In general, Computed Tomography (CT) is the most accurate imaging study for evaluating ...
Gumus Kazim K Department of Biophysics, Faculty of Medicine, Erciyes University, Kayseri, Turkey Biomedical Imaging Research Center, Erciyes University, Kayseri, Turkey - - 2014
Differential diagnosis of intracranial hemorrhage versus calcification on conventional magnetic resonance images (MRIs) is often challenging. Although computed tomography (CT) confirms calcification, phase information obtained during susceptibility-weighted imaging can be useful in distinguishing between 2 pathologies. Fourteen patients previously diagnosed to have hemorrhage or calcification with imaging were included in ...
Renard-Penna Raphaële R Department of Radiology, Pitié Salpétrière Hospital, Pierre et Marie Curie University, Paris, France, - - 2014
We discuss in this review, urologists' expectations of imaging in terms of detection, characterization, pre-planning treatment and follow-up of urinary stones. Data acquisition regarding kidney stones and imaging was performed using MEDLINE searches with combinations of the following keywords: urinary stones, CT Urography, low dose CT, MRI urography, renal stones ...
Fukushima Yasuhiro Y Department of Radiology, Gunma University Hospital, 3-39-15 Showa, Maebashi, Gunma 371-8511, Japan Department of Diagnostic Radiology and Nuclear Medicine, Gunma University Graduate School of Medicine, 3-39-22 Showa, Maebashi, Gunma 371-8511, Japan - - 2014
The aim of this study was to verify the usefulness for the dose optimisation of setting a diagnostic reference level (DRL) based on the results of a prefecture-wide multi-centre radiation dose survey and providing data feedback. All hospitals/clinics in the authors' prefecture with computed tomography (CT) scanners were requested to ...
Daramola Opeyemi O OO Department of Otolaryngology-Head and Neck Surgery, Northwestern University-Feinberg School of Medicine, Chicago, Illinois, - - 2014
The objective of this study was to report patients' knowledge and comfort level with computed tomography (CT) imaging for sinus disease and evaluate patient willingness to undergo empiric medical therapy (EMT) versus CT-directed therapy (CTDT). Prospective survey study. A 22-item survey was administered to patients with nasal/sinus symptoms in a ...
Corwin Michael T MT Department of Radiology, University of California, Davis Medical Center, 4860 Y Street, Suite 3100, Sacramento, CA, 95817, USA, - - 2014
To determine the accuracy and radiation dose reduction of a limited abdominopelvic CT from the bottom of T10 to the top of the pubic symphysis in patients with suspected acute appendicitis. We performed a HIPAA compliant and IRB-approved retrospective study of adult patients who underwent CT abdomen/pelvis for suspected appendicitis. ...
Yun Tae Jin TJ From the Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea (T.J.Y., J.H.K., C.H.S., S.H.C.); Department of Radiology (T.J.Y., J.H.K., C.H.S., S.H.C.), Department of Neurosurgery (C.K.P.), Department of Internal Medicine, Cancer Research Institute (T.M.K., S.H.L.), Department of Pathology (S.H.P.), and Department of Radiation Oncology, Cancer Research Institute (I.H.K.), Seoul National University Hospital, 28 Yongon-dong, Chongno-gu, Seoul 110-744, Republic of Korea; Center for Nanoparticle Research, Institute for Basic Science, Seoul, Republic of Korea (S.H.C.); and School of Chemical and Biological Engineering, Seoul National University, Seoul, Republic of Korea - - 2014
Purpose To explore the role of dynamic contrast material-enhanced magnetic resonance (MR) imaging in the differentiation of true progression from pseudoprogression in patients with glioblastoma on the basis of findings in entirely newly developed or enlarged enhancing lesions after concurrent radiation therapy and chemotherapy with temozolomide and to evaluate the ...
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 ...
Pepin Eric E Saint Louis University School of Medicine, St Louis, Missouri; Washington University School of Medicine, St Louis, - - 2014
The delivery of high-quality radiation therapy to pancreatic adenocarcinoma requires accurate localization. Radiopaque implanted fiducial markers (IFM) and self-expandable metallic stents (SEMS) have both been proposed as means of achieving accurate localization in image guided radiation therapy (IGRT). The suitability of IFM and SEMS for localization were evaluated in this ...
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 ...
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