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Contrast enhanced ultrasound testes

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https://www.readbyqxmd.com/read/28193267/abdominal-ultrasound-scanning-versus-non-contrast-computed-tomography-as-screening-method-for-abdominal-aortic-aneurysm-a-validation-study-from-the-randomized-dancavas-study
#1
Mads Liisberg, Axel C Diederichsen, Jes S Lindholt
BACKGROUND: Validating non-contrast-enhanced computed tomography (nCT) compared to ultrasound sonography (US) as screening method for abdominal aortic aneurysm (AAA) screening. METHODS: Consecutively attending men (n = 566) from the pilot study of the randomized Danish CardioVascular Screening trial (DANCAVAS trial), underwent nCT and US examination. Diameters were measured in outer-to-outer fashion. Sensitivity and specificity were done testing each modality against each other as reference standard...
February 14, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28186627/value-of-three-section-contrast-enhanced-transrectal-ultrasonography-in-the-detection-of-prostate-cancer
#2
Ting-Yue Qi, Hong-Guang Sun, Nian-Fen Li, Hao Feng, Yong-Ling Ding, Xiao-Xiang Wang
BACKGROUND: To assess the efficacy of three-section contrast-enhanced transrectal ultrasonography (CETRUS) in prostate cancer (PCa) detection. METHODS: A total of 169 consecutive patients with either PSA level ≥ 4 ng/ml or abnormal digital rectal examination findings were prospectively enrolled in this single center study. All patients underwent baseline transrectal ultrasonography (TRUS) and three-section CETRUS by one investigator blinded to any clinical data before TRUS-guided transperineal biopsy...
February 10, 2017: Journal of Clinical Ultrasound: JCU
https://www.readbyqxmd.com/read/28144721/focal-fat-deposition-in-the-liver-diagnostic-challenges-on-imaging
#3
REVIEW
Jong Keon Jang, Hyun-Jung Jang, Jin Sil Kim, Tae Kyoung Kim
While focal fat deposition in the liver mostly occurs in typical locations related to non-portal venous supply, unusual patterns of focal fat deposition, including multi-nodular, mass-like, and perivascular patterns, mimic malignancies and cause diagnostic challenges. Patients with unusual focal fat deposition often have potential underlying etiologies such as diabetes, alcohol abuse, metabolic disease, or various medications/chemotherapy. Some cases can be explained by non-portal venous supply or ischemia...
February 1, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28144402/impact-of-contrast-enhanced-ultrasound-in-patients-with-renal-function-impairment
#4
Rossano Girometti, Tiziano Stocca, Elena Serena, Antonio Granata, Michele Bertolotto
AIM: To investigate the role of contrast enhanced ultrasound (CEUS) in evaluating patients with renal function impairment (RFI) showing: (1) acute renal failure (ARF) of suspicious vascular origin; or (2) suspicious renal lesions. METHODS: We retrospectively evaluated patients addressed to CEUS over an eight years period to rule-out vascular causes of ARF (first group of 50 subjects) or assess previously found suspicious renal lesions (second group of 41 subjects with acute or chronic RFI)...
January 28, 2017: World Journal of Radiology
https://www.readbyqxmd.com/read/28114062/delay-and-standard-deviation-beamforming-to-enhance-specular-reflections-in-ultrasound-imaging
#5
Raja Sekhar Bandaru, Anders Sornes, Jeroen Hermans, Eigil Samset, Jan D'hooge
Although interventional devices such as needles, guide wires and catheters are best visualized by X-ray, real-time volumetric echography could offer an attractive alternative as it avoids ionizing radiation; it provides good soft tissue contrast and it is mobile and relatively cheap. Unfortunately, as echography is traditionally used to image soft tissue and blood flow, the appearance of interventional devices in conventional ultrasound images remains relatively poor which is a major obstacle towards ultrasound-guided interventions...
September 27, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28113929/entropy-of-ultrasound-contrast-agent-velocity-fields-for-angiogenesis-imaging-in-prostate-cancer
#6
Ruud van Sloun, Libertario Demi, Arnoud Postema, Jean de la Rosette, Hessel Wijkstra, Massimo Mischi
Prostate cancer care can benefit from accurate and cost-efficient imaging modalities that are able to reveal prognostic indicators for cancer. Angiogenesis is known to play a central role in the growth of tumors towards a metastatic or a lethal phenotype.With the aim of localizing angiogenic activity in a noninvasive manner, Dynamic Contrast Enhanced Ultrasound (DCEUS) has been widely used. Usually, the passage of ultrasound contrast agents thought the organ of interest is analyzed for the assessment of tissue perfusion...
November 16, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28113620/fast-vascular-ultrasound-imaging-with-enhanced-spatial-resolution-and-background-rejection
#7
Avinoam Bar-Zion, Charles Tremblay-Darveau, Oren Solomon, Dan Adam, Yonina Eldar
Ultrasound super-localization microscopy techniques presented in the last few years enable non-invasive imaging of vascular structures at the capillary level by tracking the flow of ultrasound contrast agents (gas microbubbles). However, these techniques are currently limited by low temporal resolution and long acquisition times. Super-resolution optical fluctuation imaging (SOFI) is a fluorescence microscopy technique enabling sub-diffraction limit imaging with high temporal resolution by calculating high order statistics of the fluctuating optical signal...
August 15, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28102955/compound-speckle-model-detects-anti-angiogenic-tumor-response-in-preclinical-nonlinear-contrast-enhanced-ultrasonography
#8
Matthew R Lowerison, Justin J Tse, M Nicole Hague, Ann F Chambers, David W Holdsworth, James C Lacefield
PURPOSE: This paper proposes a method for analyzing the first-order speckle statistics of nonlinear contrast-enhanced ultrasound images from tumors. METHODS: Contrast signal intensity is modeled as a compound distribution of exponential probability density functions with a gamma weighting function. The gamma probability weighting function serves as an approximation for log-normally distributed flow velocities in a vascular network. The model was applied to sub-harmonic bolus-injection images acquired from a mouse breast cancer xenograft model treated with murine version bevacizumab...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28098400/role-of-contrast-enhanced-sonography-in-the-evaluation-of-axillary-lymph-nodes-in-breast-carcinoma-a-monocentric-study
#9
Giacomo Agliata, Gianluca Valeri, Giulio Argalia, Elisa Tarabelli, Gian Marco Giuseppetti
OBJECTIVES: To evaluate the diagnostic performance of contrast-enhanced sonography for characterization of the lymph node status (metastatic or not) in patients with breast carcinomas by comparison with sentinel lymph node biopsy. METHODS: From January to August 2015, 50 female patients with a histologic diagnosis of invasive breast carcinoma were prospectively examined by ipsilateral axillary contrast-enhanced sonography. The test was performed by a single radiologist using an ultrasound system with a broadband 8-12-MHz, 38-mm high-resolution linear transducer...
January 18, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28067009/one-step-3d-tv-hysterosalpingo-foam-sonography-3d-tv-hyfosy-confirmation-test-for-essure%C3%A2-follow-up-a-multicenter-study
#10
Brunella Zizolfi, Lucia Lazzeri, Mario Franchini, Attilio Di Spiezio Sardo, Carmine Nappi, Emilio Piccione, Caterina Exacoustos
OBJECTIVE: To evaluate the feasibility and accuracy of a three-dimensional-transvaginal-hysterosalpingo-contrast-sonography using the new dedicated contrast-enhanced gel foam (3D-TV-HyFoSy) to assess the position of the tubal sterilization Essure® devices and consequent tubal occlusion in patients who underwent Essure® hysteroscopic tubal sterilization. METHODS: This multicenter study was prospectively conducted from June 2012 to July 2014 in four italian centers and included 50 women who underwent hysteroscopic Essure® microinsert placement, for a total of 95 tubes...
January 9, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28063077/automatic-gallbladder-and-gallstone-regions-segmentation-in-ultrasound-image
#11
Jing Lian, Yide Ma, Yurun Ma, Bin Shi, Jizhao Liu, Zhen Yang, Yanan Guo
PURPOSE: As gallbladder diseases including gallstone and cholecystitis are mainly diagnosed by using ultra-sonographic examinations, we propose a novel method to segment the gallbladder and gallstones in ultrasound images. METHODS: The method is divided into five steps. Firstly, a modified Otsu algorithm is combined with the anisotropic diffusion to reduce speckle noise and enhance image contrast. The Otsu algorithm separates distinctly the weak edge regions from the central region of the gallbladder...
January 6, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28052301/c-arm-cone-beam-computed-tomography-guidance-for-radiofrequency-ablation-in-hepatocellular-carcinoma
#12
Keizo Kato, Hiroshi Abe, Makiko Ika, Takeshi Yonezawa, Yoshiyuki Sato, Noriko Hanawa, Shohei Shimizu, Shinji Endo, Ryota Matsuo, Akihito Tsubota
OBJECTIVE: To assess the usefulness of C-arm cone beam computed tomography (CBCT) combined with ultrasound for the treatment of hepatocellular carcinoma (HCC) by radiofrequency ablation (RFA). METHODS: Patients underwent RFA following transcatheter arterial chemoembolization (TACE) or RFA alone under ultrasound or CBCT guidance combined with ultrasound-based techniques. They were divided into 2 groups based on the use (C group) and nonuse (NC group) of CBCT guidance...
January 5, 2017: Oncology
https://www.readbyqxmd.com/read/28009476/testing-the-efficacy-of-contrast-enhanced-ultrasound-in-detecting-transplant-rejection-using-a-murine-model-of-heart-transplantation
#13
K Fischer, S Ohori, F C Meral, M Uehara, S Giannini, T Ichimura, R N Smith, F A Jolesz, I Guleria, Y Zhang, P J White, N J McDannold, K Hoffmeister, M M Givertz, R Abdi
One of the key unmet needs to improve long-term outcomes of heart transplantation is to develop accurate, noninvasive, and practical diagnostic tools to detect transplant rejection. Early intragraft inflammation and endothelial cell injuries occur prior to advanced transplant rejection. We developed a novel diagnostic imaging platform to detect early declines in microvascular perfusion (MP) of cardiac transplants using contrast-enhanced ultrasonography (CEUS). The efficacy of CEUS in detecting transplant rejection was tested in a murine model of heart transplants, a standard preclinical model of solid organ transplant...
December 23, 2016: American Journal of Transplantation
https://www.readbyqxmd.com/read/27995384/quantitative-imaging-by-pixel-based-contrast-enhanced-ultrasound-reveals-a-linear-relationship-between-synovial-vascular-perfusion-and-the-recruitment-of-pathogenic-il-17a-f-il-23-cd161-cd4-t-helper-cells-in-psoriatic-arthritis-joints
#14
Ugo Fiocco, Roberto Stramare, Veronica Martini, Alessandro Coran, Francesco Caso, Luisa Costa, Mara Felicetti, Gaia Rizzo, Matteo Tonietto, Anna Scanu, Francesca Oliviero, Bernd Raffeiner, Maristella Vezzù, Francesca Lunardi, Raffaele Scarpa, David Sacerdoti, Leopoldo Rubaltelli, Leonardo Punzi, Andrea Doria, Enrico Grisan
To develop quantitative imaging biomarkers of synovial tissue perfusion by pixel-based contrast-enhanced ultrasound (CEUS), we studied the relationship between CEUS synovial vascular perfusion and the frequencies of pathogenic T helper (Th)-17 cells in psoriatic arthritis (PsA) joints. Eight consecutive patients with PsA were enrolled in this study. Gray scale CEUS evaluation was performed on the same joint immediately after joint aspiration, by automatic assessment perfusion data, using a new quantification approach of pixel-based analysis and the gamma-variate model...
December 20, 2016: Clinical Rheumatology
https://www.readbyqxmd.com/read/27992383/quantification-of-tumor-perfusion-using-dynamic-contrast-enhanced-ultrasound-impact-of-mathematical-modeling
#15
Maxime Doury, Alexandre Dizeux, Alain de Cesare, Olivier Lucidarme, Claire Pellot-Barakat, S Lori Bridal, Frédérique Frouin
Dynamic contrast-enhanced ultrasound has been proposed to monitor tumor therapy, as a complement to volume measurements. To assess the variability of perfusion parameters in ideal conditions, four consecutive test-retest studies were acquired in a mouse tumor model, using controlled injections. The impact of mathematical modeling on parameter variability was then investigated. Coefficients of variation (CV) of tissue blood volume (BV) and tissue blood flow (BF) based-parameters were estimated inside 32 sub-regions of the tumors, comparing the log-normal (LN) model with a one-compartment model fed by an arterial input function (AIF) and improved by the introduction of a time delay parameter...
February 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27981485/-1-h-mr-spectroscopy-of-suspicious-breast-mass-lesions-at-3t-a-clinical-experience
#16
Stefania Montemezzi, Carlo Cavedon, Lucia Camera, Gabriele Meliadò, Francesca Caumo, Ilaria Baglio, Francesco Sardanelli
OBJECTIVES: To test 3T proton magnetic resonance spectroscopy ((1)H-MRS) for breast mass lesions. METHODS: Patients with BI-RADS 4-5 lesions at mammography/ultrasound were prospectively enrolled. After contrast-enhanced breast MRI, single-voxel MRS (point-resolved volume selection, PRESS); pencil-beam shimming; volume of interest 1 cm(3); TR/TE = 3000/135 ms) was performed. Spectra were considered reliable if the full width at half maximum (FWHM) of the water peak was ≤45 Hz...
March 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/27973542/increased-vascularization-in-the-vulnerable-upstream-regions-of-both-early-and-advanced-human-carotid-atherosclerosis
#17
Ola Hjelmgren, Karl Gellerman, Josefin Kjelldahl, Per Lindahl, Göran M L Bergström
BACKGROUND: Vascularization of atherosclerotic plaques has been linked to plaque vulnerability. The aim of this study was to test if the vascularization was increased in upstream regions of early atherosclerotic carotid plaques and also to test if the same pattern of vascularization was seen in complicated, symptomatic plaques. METHODS: We enrolled 45 subjects with early atherosclerotic lesions for contrast enhanced ultrasound and evaluated the percentage of plaque area in a longitudinal ultrasound section which contained contrast agent...
2016: PloS One
https://www.readbyqxmd.com/read/27935550/vascular-complications-in-liver-transplantation-beneficial-role-of%C3%A2-contrast-enhanced-ultrasound-ceus-%C3%A2-in%C3%A2-the%C3%A2-postoperative-phase
#18
J Rübenthaler, K J Paprottka, E Hameister, K Hoffmann, N Joiko, M Reiser, D A Clevert
PURPOSE: To compare the sensitivity and specificity of contrast-enhanced ultrasound (CEUS) and computed tomography (CT) in the diagnosis of vascular complications after liver transplantation in the postoperative phase. MATERIALS AND METHODS: A total of 60 patients with elevated liver function tests after liver transplantation with initial imaging studies between July 2005 and November 2015 were retrospectively analysed. CEUS and CT were compared in their diagnosis of vascular complications and CT was considered as the gold standard...
2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27913326/delay-and-standard-deviation-beamforming-to-enhance-specular-reflections-in-ultrasound-imaging
#19
Raja Sekhar Bandaru, Anders Rasmus Sornes, Jeroen Hermans, Eigil Samset, Jan D'hooge
Although interventional devices, such as needles, guide wires, and catheters, are best visualized by X-ray, real-time volumetric echography could offer an attractive alternative as it avoids ionizing radiation; it provides good soft tissue contrast, and it is mobile and relatively cheap. Unfortunately, as echography is traditionally used to image soft tissue and blood flow, the appearance of interventional devices in conventional ultrasound images remains relatively poor, which is a major obstacle toward ultrasound-guided interventions...
December 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27890423/hepatic-epithelioid-angiomyolipoma-clinical-features-and-imaging-findings-of-contrast-enhanced-ultrasound-and-ct
#20
Y Tan, X Xie, Y Lin, T Huang, G Huang
AIM: To evaluate the clinical features and imaging findings of epithelioid angiomyolipoma (EAML) on contrast-enhanced ultrasound (CEUS) and contrast-enhanced computed tomography (CECT). MATERIALS AND METHODS: During January 2006 to November 2015, six patients with histopathologically proven hepatic EAML were evaluated using both CECT and ultrasonography. Six patients underwent CEUS and four patients had CECT images. Patients' demographics, clinical presentations, laboratory test results, and imaging appearances were collected and analysed...
November 24, 2016: Clinical Radiology
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