Search Results
Results 301 - 350 of 1902
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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 ...
Fayad Zahi A - - 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). ...
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 ...
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 ...
Patil Rajesh R - - 2011
Successful translation of nonviral gene delivery to therapeutic applications requires detailed understanding of in vivo trafficking of the vehicles. This report compares the pharmacokinetic and biodistribution profiles of polyethylene glycol-b-polyphosphoramidate (PEG-b-PPA)/DNA micellar nanoparticles after administration through intravenous infusion, intrabiliary infusion, and hydrodynamic injection using single photon emission computed tomography/computed tomography ...
Li Mingfeng - - 2011
To evaluate the effectiveness of the proposed active noise control (ANC) system for the reduction of the acoustic noise emission generated by a 4 T MRI scanner during operation and to assess the feasibility of developing an ANC device that can be deployed in situ. Three typical scanning sequences, EPI ...
Murphy Matthew C - - 2011
To test patient acceptance and reproducibility of the 3D magnetic resonance elastography (MRE) brain exam using a soft vibration source, and to determine if MRE could noninvasively measure a change in the elastic properties of the brain parenchyma due to Alzheimer's disease (AD). MRE exams were performed using an accelerated ...
Prosch Helmut - - 2011
BACKGROUND: The aim of this retrospective study was to compare the diagnostic accuracy, the frequency of complications, the duration of the interventions and the radiation doses of CT fluoroscopy (CTF) guided biopsies of lung lesions with those of multislice CT (MS-CT) biopsy mode-guided biopsies. METHODS: Data and images from 124 ...
Schepkin Victor D - - 2012
Sodium and diffusion magnetic resonance imaging (MRI) in intracranial rat 9L gliomas were evaluated over 6-8 days using the advanced sensitivity of sodium MRI at 21.1 T. Glioma doubling time was 2.4-2.6 days. Glioma sodium signal was detected using the ultra-short echo time of 0.15 ms. The high resolution 3D ...
Gaeta Chiara - - 2011
PURPOSE: Physiological glucose uptake by the myocardium may hamper visualization of coronary atherosclerotic plaques in (18)F-FDG PET studies. Intracellular myocardial calcium relates to glucose influx. We assessed whether administration of a calcium channel blocker such as verapamil could decrease myocardial (18)F-FDG uptake in mice. METHODS: Experiments were conducted on ten ...
Bublat T - - 2011
Large-area hard magnetic L1(0)-FePt nanopatterns with out-of-plane texture were fabricated by using a top-down approach. For the fabrication process, ultraviolet nanoimprint lithography (UV-NIL) in combination with inductively coupled plasma reactive Ar-ion etching was used. By this technique a continuous L1(0)-Fe(51)Pt(49) film was nanostructured into a regular arrangement of nanodots over ...
Su Xuejuan - - 2011
OBJECTIVE: To study the diagnostic accuracy of enhanced multi-detector CT virtual endoscopy (MDCT-VE) for small intestinal tumors. MATERIALS AND METHODS: 125 patients were examined by multi-detector CT (MDCT: 54 on 4-slice; 71 on 64-slice) following standard gastrointestinal tract cleansing, oral double contrast aerogenesis agent, and rectal gas administration. Unenhanced CT ...
Nakazawa Azusa - - 2011
PURPOSE: The aim of this study was to evaluate the significance of 2-[(18)F]fluoro-2-deoxy-D: -glucose (FDG) positron emission tomography (PET) in the assessment of the therapeutic response to (131)I-metaiodobenzylguanidine (MIBG) in malignant phaeochromocytoma. METHODS: We reviewed the records of 11 patients (7 men and 4 women) with malignant phaeochromocytoma who underwent ...
Lazarova Neva - - 2011
INTRODUCTION: Ultrasound (US) contrast agents based on microbubbles (MBs) are being investigated as platforms for drug and gene delivery. A methodology for determining the distribution and fate of modified MBs quantitatively in vivo can be achieved by tagging MBs directly with (99m)Tc. This creates the opportunity to employ dual-modality imaging ...
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