Search Results
Results 251 - 300 of 1097
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Schwartzman David - - 2009
AIMS: Encircling ablation of the right and left pulmonary venous antra is commonly practiced. The importance to procedure outcome of electrical isolation of unablated myocardium enclosed by the encircling lesions is increasingly clear. The safe and effective achievement of isolation is dependent on a thorough comprehension of the 'electroanatomic' ablation ...
Higashihara Hiroki - - 2010
To evaluate ability of ferucarbotran-enhanced MR imaging (MRI) in differentiating metastases from nonsolid benign lesions of the liver according to signal-intensity characteristics. Sixty-six consecutive patients, who had 138 focal hepatic lesions (26 cysts, 11 hemangiomas, and 101 metastases), underwent ferucarbotran-enhanced MRI. The signal-intensity pattern of each kind of lesion relative ...
Pediconi Federica - - 2008
OBJECTIVE: The objective of our study was to intraindividually compare 0.1 mmol/kg doses of gadobenate dimeglumine and gadopentetate dimeglumine for contrast-enhanced breast MRI. SUBJECTS AND METHODS: Forty-seven women (mean age +/- SD, 50.8 +/- 12.9 years) with breast lesions classified as BI-RADS category 3, 4, or 5 for suspicion of ...
Liu Li-Ping - - 2008
PURPOSE: To investigate the vascular characteristics of focal fatty infiltration (FFI) in the liver using color Doppler sonography (CDUS) and contrast-enhanced sonography (CEUS). METHODS: We prospectively examined 25 areas of FFI of the liver in 20 patients via conventional gray-scale sonography, CDUS, and CEUS. Cadence contrast pulse sequencing and the ...
Dequesada Ivan M - - 2008
OBJECTIVE: Stereotactic radiosurgery is a commonly used treatment method in the management of metastatic brain tumors. When lesions enlarge after radiosurgery, it may represent tumor regrowth, radiation necrosis, or both. The purpose of this study was to determine whether standard magnetic resonance imaging (MRI) sequences could reliably distinguish between these ...
Chen L-D - - 2008
The aim of this study was to compare the enhancement pattern of intrahepatic cholangiocarcinoma (ICC) on contrast-enhanced ultrasound (CEUS) with that on contrast-enhanced computed tomography (CECT). 40 pathologically proven ICC lesions in 40 patients were evaluated retrospectively with both CEUS and CECT. The enhancement level and pattern in the dynamic ...
Inan Nagihan - - 2008
OBJECTIVE: The purpose of the study was to determine if color Doppler ultrasonographic (US) quantitative flow parameters are valuable to differentiate malignant peritoneal or omental involvement from benign causes. MATERIALS AND METHODS: Twenty-six consecutive patients with peritoneal or omental thickening detected by gray scale US, computed tomography, and magnetic resonance ...
Delabrousse Eric - - 2008
PURPOSE: To test the feasibility and efficacy of a percutaneous sonographically guided high-intensity interstitial ultrasound (US) ablation applicator to create "macrolesions" of confluent coagulation in an in vivo pig liver model. MATERIALS AND METHODS: Eight pigs and an interstitial US ablation applicator were used for this study. Elementary lesions and ...
Ogawa Hiroshi - - 2009
BACKGROUND: This study was undertaken to analyze the clinical and CT features of arteriovenous malformation (AVM) of the pancreas. METHODS: Seven lesions in six consecutive patients (one woman and five men, mean age 51 years) with AVM of the pancreas who underwent multiphase contrast-enhanced CT with 0.5 or 1-mm collimation ...
Ohlerth Stefanie - - 2010
Conventionally, tumour vascularity is assessed invasively by immunofluorescent analysis. Quantified contrast-enhanced power Doppler ultrasound has been used to measure tumour angiogenesis non-invasively in humans and experimental animals. The purpose of this study was to correlate quantified contrast-enhanced power Doppler ultrasound with immunofluorescent results in 45 spontaneous canine tumours. With power ...
Coenegrachts Kenneth - - 2009
PURPOSE: To compare lesion conspicuity and image quality between single-shot spin echo echo planar imaging (SS SE-EPI) before, immediately and 5min after intravenous (IV) injection of superparamagnetic iron oxide (SPIO) for detecting and characterizing focal liver lesions (FLLs). MATERIALS AND METHODS: Twenty-five patients suspected for colorectal liver metastases were prospectively ...
Widmann Gerlig - - 2009
High resolution ultrasound (HR-US) including color Doppler ultrasound (CD-US), power Doppler ultrasound (PD-US), and spectral wave analysis (SWA), is a broadly available, non-invasive and relatively low-cost modality without ionizing radiation. It is increasingly used for initial assessment of an ambiguous musculoskeletal soft-tissue lesion and for sonographically guided core biopsy. The ...
Giannetti Andrea - - 2008
Spontaneous necrosis of hepatocellular carcinoma (HCC) is rare. We report the case of a 72-year-old woman with an HCC nodule that underwent necrosis after sonographically guided needle biopsy. Baseline sonographic examination revealed only a nonspecific change in the echogenicity of the lesion. Subsequent necrosis was suggested on contrast-enhanced sonographic examination ...
Dumas Iii John H - - 2008
Production of complete (i.e. continuous and transmural) cardiac lesions by radiofrequency (RF) ablation can cure certain cardiac arrhythmias. However, a predictor of lesion completeness that is reliable and can be measured intraoperatively is needed in order to maximize effectiveness of ablation therapy. Predictors that require membrane excitation or response to ...
Maruyama Hitoshi - - 2009
The aim was to examine the efficacy of contrast-enhanced ultrasound (US) with Sonazoid to demonstrate ultrasonically unrecognizable hypervascular hepatocellular carcinoma (HCC) and apply percutaneous US-guided treatments. The subjects of this prospective study were 44 cirrhotic patients with 55 hypervascular lesions (12.7+/-4.5 mm) found by contrast-enhanced computed tomography but unrecognized by ...
Mak Chee-Wai - - 2008
Angiolymphoid hyperplasia with eosinophilia is an uncommon benign condition characterized by cutaneous nodules involving primarily the head and neck regions of young adults. We report thecase of a 49-year-old woman with such a lesion in the arm. Sonographically, the lesion exhibited a hypoechoic rim and an echogenic central portion. On ...
Sieroń Aleksander - - 2008
BACKGROUND: Laser-induced fluorescence diagnostics (LIFE) can be used as an imaging system of precancerous and neoplasmatic lesions of oral mucosa. LIFE system utilizes healthy and neoplasmatically changed tissue in autofluorescence, without using any fluorescence substances. Neoplasmatic lesions are visible in pseudo colors, healthy tissue as a shade of green color ...
Maury Philippe - - 2008
We report the histological evaluation of both endocardial and epicardial radiofrequency (RF) ablation lesions in the explanted heart of a patient presenting with nonischemic dilated cardiomyopathy complicated by recurrent electrical storms. In this case, chronic RF lesions were almost transmural at the endocardial side, while remaining only superficial at the ...
Tailor Jignesh K - - 2008
OBJECTIVE: Dysembryoplastic neuroepithelial tumor (DNT) occurs rarely in the cerebellum. We describe a rare case of cerebellar DNT that developed contrast enhancement after long-term observation and discuss the underlying mechanism and clinical relevance of this unusual phenomenon. CLINICAL PRESENTATION: A 34-year-old woman with known cystic cerebellar lesions presented with increased ...
Canciglia A - - 2008
AIM: The aim of this study was to report the role of duplex scanning in selection of patients with lower limb ischemia for infrainguinal endovascular revascularization. METHODS: From January 2002 to December 2005, 95 patients (66 male, 29 female) underwent infrainguinal endovascular revascularization based on duplex scanning. The indications for ...
Alleman Wade G - - 2008
OBJECTIVE: The purpose of this study was to determine whether the clinical history and sonographic appearance of solid epididymal masses could aid in distinguishing benign and malignant disease. METHODS: We retrospectively reviewed the medical records of all patients who had solid epididymal masses evaluated by scrotal sonography at our institution ...
Zhang Jingbo - - 2008
OBJECTIVE: To determine the computed tomographic imaging features predictive of adnexal malignancy and evaluate the accuracy of contrast-enhanced helical computed tomography (CT) in the characterization of adnexal masses. MATERIALS AND METHODS: The institutional review board waived the informed consent requirement for this retrospective study, which was Health Insurance Portability and ...
Alcázar Juan Luis - - 2008
OBJECTIVE: The purpose of this study was to assess intraobserver and interobserver agreement for tumor vascular network evaluation as assessed by 3-dimensional (3D) power Doppler sonography for discriminating benign from malignant adnexal masses. METHODS: Stored 3D power Doppler angiographic volume data from 39 women with a diagnosis of a vascularized ...
Fleischer Arthur C - - 2008
OBJECTIVE: The aim of this prospective study was to evaluate differences in contrast enhancement and contrast enhancement kinetics in benign versus malignant ovarian masses with pulse inversion harmonic transvaginal sonography. METHODS: Seventeen consecutive patients with 23 morphologically abnormal ovarian masses (solid or cystic with papillary excrescences, focally thickened walls, or ...
Chen Tian-Wu - - 2008
Chronic infection of a seminal vesicle cyst is an extremely rare disorder worldwide. To date, only two cases, which were diagnosed initially by the use of contrast-enhanced CT or non-enhanced MR imaging, have been reported in the literature. We report here a case of a 78-year-old man with chronic infection ...
Lee In Joon - - 2008
We present a rare case of a focal intrahepatic extramedullary hematopoiesis (EMH) that mimicked a hypervascular hepatic neoplasm in a 33-year-old woman with idiopathic myelofibrosis. The lesion showed homogeneous and persistent enhancement on both contrast-enhanced CT and gadolinium-enhanced dynamic MR imaging. The lesion did not demonstrate an apparent signal drop ...
Guerra A - - 2008
BACKGROUND: Accurate evaluation of adnexal masses allows correct surgical procedure, avoiding unnecessary surgery. PURPOSE: To evaluate the accuracy of magnetic resonance imaging (MRI) in the diagnosis of malignancy of adnexal lesions. MATERIAL AND METHODS: We retrospectively reviewed the pelvic MRI scans of 161 patients with 199 surgically confirmed adnexal masses, ...
Jansen Sanaz A - - 2008
To perform a pilot study investigating whether the sensitivity and specificity of kinetic parameters can be improved by considering mass and nonmass breast lesions separately. The contrast media uptake and washout kinetics in benign and malignant breast lesions were analyzed using an empirical mathematical model (EMM), and model parameters were ...
Riebel Thomas - - 2008
OBJECTIVE: Dermoids and epidermoids are defined as ectodermal inclusion cysts. The aim of this study was to evaluate the spontaneous natural behavior and the ultrasonographic appearance of calvarial dermoids and epidermoids. MATERIALS AND METHODS: The ultrasonographic image datasets of 100 consecutive children up to 4 years of age (52 females, ...
Pauls Sandra - - 2008
The characterization of solid pulmonary lesions with imaging methods remains a diagnostic challenge. The aim of this study was to correlate kinetic parameters of dynamic perfusion magnetic resonance imaging (MRI) with histological tumor classification. Dynamic contrast-enhanced MRI of 31 patients with pulmonary masses (five benign lesions, 26 malignant tumors) was ...
Vest John A - - 2008
Irrigated (cooled) radiofrequency (RF) ablation has become our primary ablation tool for treating atrial fibrillation, macroreentrant atrial tachycardias, and scar-related ventricular tachycardias. As with any technology that increases ablation lesion size, there is the potential for increased risk. The methods described are a cautious approach to power titration that considers ...
Ward Emily - - 2008
Radiofrequency ablation is the use of low-voltage high-frequency electrical energy to heat and destroy abnormal tissues within the human body. It has gained increasing acceptance as both a primary and secondary form of treatment in the musculoskeletal system because of its excellent safety profile, ease of use, and technical success. ...
Maizlin Zeev V - - 2008
OBJECTIVE: The purpose of this study was to determine the sonographic features of Hürthle cell neoplasms (HCNs) of the thyroid. METHODS: We retrospectively analyzed the sonographic appearance of 15 histologically proven HCNs in 15 patients aged 16 to 70 years (mean age, 44 years). Sonographic features that were reviewed included ...
van den Bos Indra C - - 2008
On state-of-the-art magnetic resonance imaging, most lesions can be detected and characterized with confidence according to well-known criteria. However, atypical characteristics in some common lesions and the incidental encounter with rare lesions may pose diagnostic difficulties. In this article, six challenging hepatic lesions will be discussed and evaluated on the ...
Lee M W - - 2008
Targeting of index tumours is prerequisite to their radiofrequency ablation. However, small hepatocellular carcinomas (HCCs) in the liver dome are often invisible on ultrasonography, thus causing difficulty in their targeting. In cases with multinodular HCCs, adjacent HCC lesions with compact iodized oil retention can be used as anatomic landmarks to ...
Kwak Jin Young - - 2008
OBJECTIVE: The purpose of this study was to assess the role of power Doppler US in differentiating benign from malignant solid breast masses when used in conjunction with grayscale sonography (US) and the relationship with axillary lymph node metastasis. SUBJECTS AND METHODS: Grayscale US of 353 solid lesions was categorized ...
von Bary Christian - - 2008
BACKGROUND: Surgical ablation techniques using microwave energy are an alternative to catheter-based ablation therapy in the treatment of atrial fibrillation. We investigate electrical conduction properties of linear lesions after epicardial ablation in a pig model by using an electroanatomic mapping system. METHODS: After medial sternotomy in eight pigs epicardial pacing ...
Yanagi Daizaburo - - 2008
BACKGROUND: Treatment of bifurcation lesion with a drug-eluting stent (DES) remains problematic. The purpose of this study was to investigate an appropriate treatment strategy for bifurcation lesion with a Sirolimus-eluting stent (SES). METHOD: One-hundred-forty-one patients with 169 bifurcation lesions were treated at three centers in Japan using a Sirolimus-eluting stent. ...
Kirtane Ajay J AJ Center for Interventional Vascular Therapy, Columbia University Medical Center, New York, New York, - - 2008
We sought to identify correlates of 30-day adverse events among patients undergoing percutaneous coronary intervention (PCI) of saphenous vein grafts (SVG). Although the use of distal embolic protection devices during SVG intervention reduces major adverse cardiac events (MACE), many patients still experience MACE despite distal embolic protection, and the major ...
Ertaş Gökhan - - 2008
A fully automated software is introduced to facilitate MR mammography (MRM) examinations and overcome subjectiveness in diagnosis using normalized maximum intensity-time ratio (nMITR) maps. These maps inherently suppress enhancements due to normal parenchyma and blood vessels that surround lesions and have natural tolerance to small field inhomogeneities and motion artifacts. ...
Umeda Hisashi - - 2009
BACKGROUND: Recently, stent fracture (SF) of sirolimus-eluting stents (SES) has been shown to be associated with an increased risk of in-stent restenosis. We sought to evaluate the incidence, predictors and clinical outcome of SF after SES implantation in comparable unselected lesions. METHODS: A total of 430 lesions of 382 patients ...
Chami Linda - - 2008
OBJECTIVE: The objective of our study was to compare the usefulness of contrast-enhanced sonography with baseline sonography in detecting malignant liver lesions. SUBJECTS AND METHODS: This prospective study included 116 patients. All patients underwent a preoperative conventional sonography examination followed by sonography after injection of contrast agent combined with the ...
Numata Kazushi - - 2008
We evaluated the usefulness of contrast-enhanced harmonic gray scale sonography with a newly developed sonographic contrast medium as a means of guidance for percutaneous ablation therapy of hepatocellular carcinoma lesions not detected by conventional sonography. We examined 85 patients with 108 hepatocellular carcinoma lesions that were identified as hypervascular by ...
Huang Sheng-Fang - - 2008
Tumor vascularity is an important factor that has been shown to correlate with tumor malignancy and was demonstrated as a prognostic indicator for a wide range of cancers. Three-dimensional (3-D) power Doppler ultrasound (PDUS) offers a convenient tool for investigators to inspect the signals of blood flow and vascular structures ...
Rossi Federica - - 2008
Contrast-enhanced ultrasound was used to study focal and multifocal lesions of the spleen in 26 dogs and two cats affected by 11 benign and 18 malignant splenic diseases. A second-generation microbubble contrast medium (Sonovue) was injected into the cephalic vein and enhancement patterns were subjectively described and time intensity curves ...
Hahn Joo-Yong - - 2008
OBJECTIVE: To investigate the geometry in bifurcation using intravascular ultrasound (IVUS) analysis. METHODS: We performed quantitative three-dimensional IVUS analysis of 31 true bifurcation lesions and 30 angiographically normal bifurcation segments including the main and side branches as well as parent vessel. RESULTS: The external elastic membrane (EEM) area changed significantly ...
Kyriakopoulou K - - 2008
PURPOSE: Doppler Perfusion Index (DPI) has been used in the detection of overt liver metastatic disease. In the present prospective study we evaluated the use of DPI in the differential diagnosis of liver tumours. MATERIALS AND METHODS: We have included in our study 76 patients with focal hepatic lesion and ...
Gokalp Gokhan - - 2009
OBJECTIVE: To evaluate the contribution of power Doppler ultrasonography (PDUS) to breast imaging reporting and data system ultrasonography (BI-RADS US) categorization of solid breast masses. MATERIALS AND METHODS: Totally 94 solid lesions with histopathological results in 49 patients were included in the study. US features of the lesions were classified ...
Culbertson Gary Randall - - 2008
BACKGROUND: Seborrheic keratoses (SKs) are benign cutaneous tumors of the epidermis. Localization in the head and neck areas can produce an unsightly appearance. Recurrence after curettage, shave excision, cryoablation, or chemical peel can be common. OBJECTIVE: The objective was to determine if laser ablation with the 532-nm laser and color ...
Fornwalt Brandon K BK Emory University School of Medicine, Department of Biomedical Engineering, Atlanta, Georgia 30322, USA. - - 2008
Left ventricular dyssynchrony is often diagnosed by comparing velocity curves from Doppler tissue images of two or more myocardial regions. Velocity curves are generated by placing sample volumes or regions of interest (ROIs) within the myocardium. ROIs need to be manually relocated to maintain a midmyocardial location as the heart ...
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