Search Results
Results 301 - 350 of 1913
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Kothary Nishita - - 2011
PURPOSE: To prospectively evaluate the impact of C-arm CT on radiation exposure to hepatocellular carcinoma (HCC) patients treated by chemoembolization. MATERIALS AND METHODS: Patients with HCC (N = 87) underwent digital subtraction angiography (DSA; control group) or combined C-arm CT/DSA (test group) for chemoembolization. Dose-area product (DAP) and cumulative dose ...
Kröpil Patric - - 2011
BackgroundBiopsies guided by computed tomography (CT) play an important role in clinical practice. A short duration, minimal radiation dose and complication rate are of particular interest.PurposeTo evaluate the potential of a novel self-manufactured wire-based needle guide device for CT-guided thoracic biopsies with respect to radiation dose, intervention time and complication ...
Yang Jehoon - - 2011
The purpose of this research was to investigate the anti-angiogenic inhibitory effect of KR-31831, a newly developed anti-angiogenic agent, on an in vivo human ovarian carcinoma model using dynamic contrast-enhanced (DCE) MRI. Xenografted ovarian tumors were established by subcutaneous injection of SKOV3 cells into mice. The mice were treated daily ...
Jeong Dong Seop - - 2011
BACKGROUND: We evaluated the impact of functional mitral regurgitation (MR) on clinical outcomes and to identify predictors of residual MR after aortic valve replacement in aortic stenosis. METHODS: Three hundred and eighty-four patients who underwent primary aortic valve replacement for aortic stenosis were enrolled. Patients were divided into the no-MR ...
Yaparpalvi Ravindra - - 2011
PURPOSE: To study the influence of timing of postseed implant imaging on rectal dose-volume parameters for cesium-131 ((131)Cs) seed prostate implants. METHODS AND MATERIALS: Fifteen patients were treated in our institution with combination (131)Cs brachytherapy followed by pelvic external beam radiation therapy for intermediate to high-risk prostate cancers. For all ...
Fox Benjamin D - - 2011
Previous studies comparing combination therapy (CT) of pulmonary vasodilators to monotherapy (MT) in patients with pulmonary arterial hypertension (PAH) report conflicting results as to whether CT is more efficacious than MT. We systematically searched the Cochrane Library, EMBASE, and MEDLINE databases for randomized controlled trials comparing CT to MT for ...
Nakaura Takeshi - - 2011
Purpose: To evaluate the feasibility of a low-contrast agent dose protocol at abdominal dynamic computed tomography (CT) with a low tube voltage high tube current-time product technique and a 256-detector row CT unit. Materials and Methods: This prospective study received institutional review board approval; written informed consent to participate was ...
Fujimoto Sakae - - 2011
PURPOSE: To apply magnetic resonance (MR) imaging to differential diagnosis of cardiogenic pulmonary edema (CPE) and noncardiogenic pulmonary edema (NCPE). MATERIALS AND METHODS: In the CPE group, MR measurements were performed on 5 rats just before and 3 h after administration of 21 ± 2% body weight of normal saline. ...
Mattias Ringh - - 2011
AIM: In a two-parted study, evaluate a new concept were mobile phone technology is used to dispatch lay responders to nearby out-of-hospital cardiac arrests (OHCAs). METHODS: Mobile phone positioning systems (MPS) can geographically locate selected mobile phone users at any given moment. A mobile phone service using MPS was developed ...
Li Xinhua - - 2011
The CT scanner-displayed radiation dose information is based on CT dose index (CTDI) over an integration length of 100 mm (CTDI(100)), which is lower than the CTDI over an infinite integration length (CTDI(∞)). In an adult or a pediatric body CT scan, the limiting equilibrium dose can be established near ...
Foo F J - - 2011
OBJECTIVES: The United Kingdom abdominal aortic aneurysm (AAA) screening programme refers aneurysms with ultrasound (US) diameters of ≥5.5 cm to vascular services for consideration of computed tomography (CT) and intervention. We investigated the discrepancy between US and CT, implications on clinical decisions and question at which stage CT be used. DESIGN/METHODS: ...
Kilic K - - 2011
BACKGROUND AND PURPOSE: While CT has found wide use in medical practice, it is also a substantial source of radiation exposure and is associated with an increased lifetime risk of cancer. There is an urgent need for new approaches to reduce the radiation dose in CT. In this regard, ASIR ...
Moon Won-Jin - - 2011
INTRODUCTION: We hypothesized that methyl-guanine methyl transferase (MGMT) promoter methylation status, a predictor of the chemosensitivity for high grade gliomas (HGGs), may be associated with computed tomography (CT)/magnetic resonance (MR) imaging variables. METHODS: Out of 38 consecutive patients with HGGs, 24 patients whose MGMT promoter methylation status was available [12 ...
Toh C H - - 2011
BACKGROUND AND PURPOSE: The differentiation of abscesses from glioblastomas and metastases may not always be possible on the basis of DWI. Our hypothesis was that differences in diffusion properties as detected by DTI allow differentiation of abscess from glioblastomas and metastasis. Furthermore, diagnostic performance of tensor metrics quantifying anisotropy or ...
Christe Andreas - - 2012
To assess the effect of radiation dose reduction on the appearance and visual quantification of specific CT patterns of fungal infection in immuno-compromised patients. Raw data of thoracic CT scans (64 × 0.75 mm, 120 kVp, 300 reference mAs) from 41 consecutive patients with clinical suspicion of pulmonary fungal infection ...
Dheer Sachin - - 2011
OBJECTIVE: To evaluate what limitations, if any, radiographs have in detecting and characterizing the morphology of non-displaced OCLTs (size, cystic change, fragmentation, and avascular necrosis [AVN]). MATERIALS AND METHODS: Thirty-three OCLTs in 32 patients were reviewed in consensus by a board-certified, fellowship-trained musculoskeletal radiologist and orthopedic surgeon, on radiographs and ...
Schernthaner Ruediger E - - 2012
To compare ECG-gated and non-gated CT angiography of the aorta at the same radiation dose, with regard to motion artifacts (MA), diagnostic confidence (DC) and signal-to-noise-ratios (SNRs). Sixty consecutive patients prospectively randomized into two groups underwent 64-row CT angiography, with or without dose-modulated ECG-gating, of the entire aorta, due to ...
Lavdas Ioannis I Comprehensive Cancer Imaging Centre (CCIC), Imperial College MRC Cyclotron Building, Hammersmith Hospital, DuCane Road, London, W12 0NN, UK. - - 2011
To design and evaluate a fully shielded, λ/4 stripline resonator as a receive-only surface coil for preclinical MRI at 4.7 T. A 20 mm diameter stripline surface coil was fabricated from double-sided Duroid 5880 PCB material and was directly coupled to the input of a MOSFET preamplifier, without requiring a ...
Kirby Miranda - - 2011
Purpose: To evaluate short-acting bronchodilator effects in chronic obstructive pulmonary disease (COPD) by using hyperpolarized helium 3 ((3)He) magnetic resonance (MR) imaging, spirometry, and plethysmography. Materials and Methods: Fourteen ex-smokers with COPD provided written informed consent to a local ethics board-approved and Health Insurance and Portability Accountability Act-compliant protocol and ...
Munck Af Rosenschöld Per - - 2011
The purpose of this study was to compare treatment plans generated using fixed beam Intensity Modulated photon Radiation Therapy (IMRT), inversely optimized arc therapy (RapidArc(R), RA) with spot-scanned Intensity Modulated Proton Therapy (IMPT) for high-grade glioma patients. Plans were compared with respect to target coverage and sparing of organs at ...
Choi Jin-Young - - 2011
The purpose of this study was to assess whether gadoxetate disodium-enhanced hepatobiliary phase MRI could predict the histologic factors of hepatocellular carcinomas (HCCs). Fifty-three HCCs histopathologically proved by surgery in 51 patients were evaluated retrospectively. All patients underwent gadoxetate disodium-enhanced MRI before surgical resection. The differences in contrast enhancement ratio ...
Kim Sung Hun - - 2011
The aim of this study was to evaluate the imaging findings of invasive lobular carcinoma (ILC) compared to those of invasive ductal carcinoma (IDC). The study included ILCs (n = 27) and IDCs (n = 85). Imaging findings were retrospectively evaluated, according to the BI-RADS lexicon. We compared the imaging ...
Kang Bong Joo - - 2011
The purpose of this study was to determine the clinical significance of the incidental finding of hypermetabolic foci in the breast at (18)F-FDG PET/CT in patients with malignant disease other than breast cancer or during a screening examination. The files of 13,897 women who underwent FDG PET/CT from November 2004 ...
Kuyumcuo─člu Umur - - 2011
The role of 18F-FDG (18F fluorodeoxyglucose) PET/CT** (Positron emission tomography) in the diagnosis, treatment and follow up of benign and malignant ovarian tumors had been investigated previously. The objective of the following study was to evaluate the predictive value of PET/CT in benign and malignant ovarian tumors and compare with ...
Mountain Kelsey M - - 2011
T(2) was used in this study to assess tendon microstructure. Two unloaded digital extensor tendons were bent such that their long axes were imaged throughout 180° with respect to B(0) . T(2) -weighted images reveal periodic banding (∼200 μm) when tendons were oriented at ±55° with respect to B(0) . ...
Chuah Tong Kuan - - 2011
This paper presents a study that investigated the potential of texture analysis using Fluid Sensitive Fat Suppressed MRI images for the use in detection of bone marrow edema. A total of 168 slices of knee MRI from 10 subjects were involved. Six histogram-based textures (mean intensity, standard deviation, smoothness, third ...
Bendaoud Sofiane - - 2011
To compare diagnostic information and radiation dose between volumetric and sequential scanning in the follow-up of chronic and diffuse bronchopulmonary diseases. Sixty-three consecutive patients, aged 50 years or younger, referred for the follow-up of diffuse infiltrative lung disease (group 1; n=38) or cystic fibrosis (group 2; n=25), underwent a noncontrast ...
Lee Min-Cheol - - 2011
We investigated the migration of endogenous neural stem cells (NSCs) toward an infarct lesion in a photo-thrombotic stroke model. The lesions produced by using rose bengal dye (20 mg/kg) with cold light in the motor cortex of Sprague-Dawley rats were also evaluated with sequential magnetic resonance imaging (MRI) from 30 ...
Choi Jin Woo - - 2011
The in-stent signal reduction of the stented artery caused by susceptibility artifact or radiofrequency shielding artifact limited the use of time-of-flight MR angiography (TOF-MRA) as a follow-up tool after intracranial stenting. We showed the degree of an artifact according to different stent types, and optimized MR parameters for TOF-MRA in ...
Fayad Zahi A ZA Translational and Molecular Imaging Institute, Mount Sinai School of Medicine, New York, NY 10029, USA. - - 2011
dal-PLAQUE is a placebo-controlled multicenter study designed to assess the effect of dalcetrapib on imaging measures of plaque inflammation and plaque burden. dal-PLAQUE is a multimodality imaging study in the context of the large dal-HEART Program. Decreased high-density lipoprotein cholesterol is linked to increased risk of coronary heart disease (CHD). ...
Narang Jayant - - 2011
Differentiating treatment-induced necrosis (TIN) from recurrent/progressive tumor (RPT) in brain tumor patients using conventional morphologic imaging features is a very challenging task. Functional imaging techniques also offer moderate success due to the complexity of the tissue microenvironment and the inherent limitation of the various modalities and techniques. The purpose of ...
Yamada Minoru - - 2011
The purpose of this study was to evaluate whether experimental fine-cell detector computed tomography with a 0.3125 mm cell (0.3 mm cell CT) can improve the detection of coronary vessel walls compared with conventional 64-slice computed tomography with a 0.625 mm cell (0.6 mm cell CT). A coronary vessel wall ...
Sanmartí-Garcia Gemma - - 2011
PURPOSE: To verify the utility of computed tomography (CT) in preventing inferior alveolar nerve (IAN) injury owing to lower third molar extraction in close relation to the IAN on orthopantomogram. MATERIALS AND METHODS: A retrospective cohort study design of 150 lower third molar extractions was performed. Patients were divided in ...
Chai X - - 2012
The purpose of this study was to describe quantitative dual energy CT (DECT) findings and their accuracy in the detection of acute and subacute pulmonary embolism (PE) in rabbits. Pulmonary emboli were created in 24 rabbits by gelatin sponge femoral vein injection. Conventional CT pulmonary angiography (CTPA) and DECT were ...
Kim S W - - 2012
The aim of this study was to retrospectively assess the diagnostic performance of multidetector CT (MDCT) for the diagnosis of acute cholangitis using a new scoring method. Of 80 patients with suspected biliary disease who underwent biphasic CT and endoscopic retrograde cholangiography, 39 were diagnosed as having acute cholangitis (Group ...
Deux Jean-François - - 2011
BACKGROUND: To compare magnetic resonance (MR) imaging and multidetector computed tomography (MDCT) for the assessment of myocardial infarction (MI) after alcohol septal ablation (ASA). METHODS: Ten patients (mean age, 60 years±16) were examined with both MDCT and 1.5-T MR imaging performed 10 minutes after injection, within 3 days after ASA. ...
Ng Chaan S - - 2011
To assess the reproducibility of computed tomographic (CT) perfusion measurements in liver tumors and normal liver and effects of motion and data acquisition time on parameters. Institutional review board approval and written informed consent were obtained for this prospective study. The study complied with HIPAA regulations. Two CT perfusion scans ...
Harris Lisa M LM Academic Paediatrics and Child Health, University of Birmingham, Birmingham, - - 2011
Magnetic resonance spectroscopy (MRS) has been successful in characterising a range of brain tumours and is a useful aid to non-invasive diagnosis. The pineal region poses considerable surgical challenges and a major surgical resection is not required in the management of all tumours. Improved non-invasive assessment of pineal region tumours ...
Choi Mihyun - - 2011
A modified double contrast barium enema using carboxymethylcellulose was evaluated in beagle dogs and compared with dogs receiving a conventional barium enema. The experimental group was divided into three groups (1, 2, and 3) and given 30 ml/kg of different volume ratios of a barium vs. carboxymethylcellulose mixture. Each group underwent ...
Kirat Hasan Tarik - - 2011
AIM: Evidence is lacking whether an abscess associated with anastomotic leak after an ileal pouch-anal anastomosis (IPAA) should be drained by transanal or CT-guided drainage. Therefore, the aim of this study was to compare outcomes after the two techniques for drainage. METHOD: Patients who underwent IPAA (1984-2009) and diagnosed with ...
Getman Liberty M - - 2011
Objectives: To (1) describe the computed tomography (CT) and magnetic resonance imaging (MRI) appearance of keratomas; (2) describe a CT- or MRI-assisted partial hoof wall resection technique for removal of keratomas; and (3) evaluate the morbidity and postoperative outcome of these horses. Study Design: Case series. Animals: Horses (n=10) with ...
Wagner Moritz - - 2011
To evaluate very small superparamagnetic iron oxide particles (VSOP-C184) as blood-pool contrast agent for coronary MR angiography (CMRA) in humans. Six healthy volunteers and 14 patients with suspected coronary artery disease underwent CMRA after administration of VSOP-C184 at the following doses: 20 μmol Fe/kg (4 patients), 40 μmol Fe/kg (5 ...
Bouilleret Viviane - - 2011
PURPOSE: To examine the long-term consequences of manganese exposure due to the use of manganese-enhanced magnetic resonance imaging (MEMRI) in a model of closed head injury, the fluid-percussion injury (FPI) model. MATERIALS AND METHODS: Two groups of adult male Wistar rats (n = 72) were studied with either MEMRI, whereby ...
Yoshizako Takeshi - - 2011
PURPOSE: To assess the feasibility of using diffusion-weighted magnetic resonance (MR) imaging (DWI) for evaluating perianal fistula activity. MATERIALS AND METHODS: This study retrospectively assessed 24 patients with clinically suspected perianal fistula who underwent a total of 28 MR examinations after conservative treatment with antibiotics. DWI was performed at 1.5T, ...
Levy Antonin - - 2011
OBJECTIVES: The impact of diffusion-weighted imaging (DWI) and apparent diffusion coefficients (ADCs) of MR imaging on the evaluation of residual Uterine Cervical Carcinoma after Radiation Therapy, in addition to conventional MR images. METHODS: Fourty-nine women presenting with a uterine cervical cancer were examined with 1.5T MRI and DWI, 8 (4-20) ...
Turnbull Travis L - - 2011
Microdamage in bone tissue is typically studied using destructive, two-dimensional histological techniques. Contrast-enhanced micro-computed tomography (micro-CT) was recently demonstrated to enable non-destructive, three-dimensional (3-D) detection of microdamage in machined cortical and trabecular bone specimens in vitro. However, the accumulation of microdamage in whole bones is influenced by variations in the ...
Elgalib A - - 2011
There are no evidence-based guidelines for the specific management of rectal Chlamydia trachomatis (CT) infection. All men who have sex with men (MSM) diagnosed with asymptomatic rectal CT by nucleic acid amplification test (NAAT) at a large London genitourinary (GU) medicine clinic between September 2006 and September 2009 were offered ...
Nauer C B - - 2011
BACKGROUND AND PURPOSE: The temporal bone is ideal for low-dose CT because of its intrinsic high contrast. The aim of this study was to retrospectively evaluate image quality and radiation doses of a new low-dose versus a standard high-dose pediatric temporal bone CT protocol and to review dosimetric data from ...
Wu Yaotang - - 2011
To implement solid state (31)P MRI ((31)P SMRI) in a clinical scanner to visualize bone mineral. Wrists of seven healthy volunteers were scanned. A quadrature wrist (31)P transmit/receive coil provided strong B(1) and good signal-to-noise ratio (SNR). A (1)H-(31)P frequency converter was constructed to enable detection of the (31)P signal ...
Planché Olivier - - 2011
PURPOSE: To evaluate the efficacy and tolerance of prophylactic embolization of angiomyolipomas (AMLs) and to analyze the therapeutic response by using three-dimensional 3D volume calculation and 3D quantification of fatty and angiomyogenic components during computed tomography (CT) follow-up. MATERIALS AND METHODS: Over a 51-month period, 30 patients with 34 AMLs ...
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