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Contrast ultrasound

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https://www.readbyqxmd.com/read/28346955/nonischemic-priapism-in-childhood-a-case-series-and-review-of-literature
#1
Hans-Walter Hacker, Marcus G Schwoebel, Philipp O Szavay
Introduction Nonischemic priapism (NIP) in childhood is a very rare affection. In the literature, patients with NIP are described mainly incidental after perineal trauma. Many of them underwent embolization of either internal pudendal artery or bulbocavernosal arteries. Patients and Methods We report on six boys between 4 and 13 years of age with NIP, treated at our institution between 2008 and 2014. Color Doppler ultrasound (CDU) was performed in all patients as emergency diagnostic evaluation. Patients were treated conservatively, including bed rest, local cooling, and perineal compression...
March 27, 2017: European Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/28344811/the-role-of-imaging-in-the-diagnosis-of-primary-prostate-cancer
#2
Hugh Harvey, Nandita M deSouza
Ultrasound and magnetic resonance imaging (MRI) are key imaging modalities in prostate cancer diagnosis. MRI offers a range of intrinsic contrast mechanisms (T2, diffusion-weighted imaging (DWI), MR spectroscopy (MRS)) and extrinsic contrast-generating options based on tumour vascular state following injection of weakly paramagnetic agents such as gadolinium. Together these parameters are referred to as multiparametric (mp)MRI and are used for detecting and guiding biopsy and staging prostate cancer. Although sensitivity of mpMRI is <75% for disease detection, specificity is >90% and a standardised reporting system together with MR-guided targeted biopsy is the optimal diagnostic pathway...
December 2016: Journal of Clinical Urology
https://www.readbyqxmd.com/read/28344791/differential-diagnosis-of-solid-pancreatic-masses-contrast-enhanced-harmonic-ceh-eus-quantitative-elastography-qe-eus-or-both
#3
Julio Iglesias-Garcia, Björn Lindkvist, Jose Lariño-Noia, Ihab Abdulkader-Nallib, J Enrique Dominguez-Muñoz
BACKGROUND: Contrast-enhanced harmonic endoscopic ultrasound (CEH-EUS) and quantitative-elastography endoscopic ultrasound (QE-EUS) are considered useful tools for the evaluation of solid pancreatic tumors (SPT). The aim of our study was to evaluate the diagnostic accuracy of CEH-EUS, QE-EUS, and the combination of both for the differential diagnosis of SPT. METHODS: Sixty-two consecutive patients (mean age 64.3 years, range 32-89 years, 44 male) who underwent EUS for the evaluation of SPT were prospectively included...
March 2017: United European Gastroenterology Journal
https://www.readbyqxmd.com/read/28344684/splenic-vein-thrombosis-as-a-rare-complication-of-disseminated-tuberculosis-imaging-diagnosis-and-case-report
#4
Satarupa Roy, Shuchi Bhatt, Rajesh Rawal, Anupama Tandon, Neha Meena
BACKGROUND: Venous thromboembolism is a known but rare complication associated with Mycobacterium tuberculosis infection. The reported incidence of venous thromboembolism is 1.5-3.4% of infected patients, and it occurs due to a hypercoagulable state induced by the associated inflammation. CASE REPORT: A young woman with pulmonary tuberculosis was found to have disseminated tuberculosis and a clinically unsuspected partial thrombus in the splenic vein on imaging...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28342532/shear-scaling-based-approach-for-irreversible-energy-loss-estimation-in-stenotic-aortic-flow-an-in-vitro-study
#5
Utku Gülan, Christian Binter, Sebastian Kozerke, Markus Holzner
Today, the functional and risk assessment of stenosed arteries is mostly based on ultrasound Doppler blood flow velocity measurements or catheter pressure measurements, which rely on several assumptions. Alternatively, blood velocity including turbulent kinetic energy (TKE) may be measured using MRI. The aim of the present study is to validate a TKE-based approach that relies on the fact that turbulence production is dominated by the flow's shear to determine the total irreversible energy loss from MRI scans...
March 12, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28342000/efficacy-and-safety-of-percutaneous-ultrasound-guided-radiofrequency-ablation-for-treating-cervical-metastatic-lymph-nodes-from-papillary-thyroid-carcinoma
#6
Yang Guang, Yukun Luo, Yan Zhang, Mingbo Zhang, Nan Li, Ying Zhang, Jie Tang
PURPOSE: The aim of this study was to assess the effectiveness and safety of ultrasound guided percutaneous radiofrequency ablation (RFA) of cervical metastatic lymph nodes (LNs) from papillary thyroid carcinoma. METHODS: 54 metastatic LNs confirmed by percutaneous biopsy in 33 patients with previous total thyroidectomy and radioiodine therapy were enrolled in this retrospective study. US and contrast-enhanced ultrasound (CEUS) examinations were performed before ablation...
March 24, 2017: Journal of Cancer Research and Clinical Oncology
https://www.readbyqxmd.com/read/28341193/is-grey-level-a-suitable-alternative-to-low-contrast-penetration-as-a-serial-measure-of-sensitivity-in-computerised-ultrasound-quality-assurance
#7
Nicholas J Dudley, Nicholas M Gibson
The aim of this study was to test the hypothesis that grey levels are a suitable alternative measure of sensitivity in ultrasound imaging quality assurance, as there are several caveats in the use of penetration depth. In a primary cohort of nine probes, where measurements had been made for 6 to 34 mo, both penetration depth and mean grey level fell below tolerance for six probes; both penetration depth and mean grey level remained within tolerance for three probes. In a secondary cohort where a measurement programme had been in place for a shorter period, grey level and/or penetration depth fell below tolerance in 15 of 66 probes; the sensitivity and specificity of at least 10% loss of grey level in predicting >5% loss in penetration depth were 91% and 93%, respectively...
February 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28338071/phase-transition-nanodroplets-for-real-time-photoacoustic-ultrasound-dual-modality-imaging-and-photothermal-therapy-of-sentinel-lymph-node-in-breast-cancer
#8
Lu Yang, Juan Cheng, Yuli Chen, Shengjie Yu, Fengqiu Liu, Yang Sun, Yu Chen, Haitao Ran
Pathological status of lymph nodes (LNs) plays a critical role in staging and treatment for the patients with breast cancer. Sentinel lymph node biopsy has become the standard method in determining pathological status of axillary LNs. Therefore, the determination of sentinel lymph nodes (SLNs) and therapy of metastatic LNs are highly desirable in clinic. Herein, an unprecedented carbon nanoparticles (CNs)-incorporated liquid-gas phase-transition nanodroplets (CNPs) with strong near-infrared (NIR) absorption, good biocompatibility, excellent photoacoustic (PA) and ultrasound (US) contrast, and high photothermal-conversion efficiency are reported in this study...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28337353/gastric-duplication-a-rare-cause-of-recurrent-vomiting
#9
Brahmananda Koduri, Katie McHale, Christina Yost, Michael H Goodman, Dennis Hoelzer
Vomiting is a physical finding that can occur at any age but presents the greatest challenge when it is recurrent in a child. The etiology is varied (Sieunarine and Manmohansingh, 1989; Suzuki, 1982), and recurrent vomiting can be a symptom of life threatening medical or surgical emergencies. Early recognition is mandatory for preventing delay in management and potential complications. Gastric duplication is rare and mostly diagnosed in infancy with only a few cases documented in the medical literature presenting in childhood...
2017: Case Reports in Pediatrics
https://www.readbyqxmd.com/read/28337285/preclinical-and-clinical-evaluation-of-the-liver-tumor-irreversible-electroporation-by-magnetic-resonance-imaging
#10
Matteo Figini, Xifu Wang, Tianchu Lyu, Zhanliang Su, Daniele Procissi, Vahid Yaghmai, Andrew C Larson, Zhuoli Zhang
Irreversible electroporation (IRE) is a relatively new technique for tumor ablation. It has shown promising results in difficult cases where surgery is not recommended and delicate anatomic structures are present near or within the tumor. Currently, liver cancer is one of the most common targets for IRE treatment. Pre-operative and post-operative imaging has a key role in IRE procedures and research studies. Although ultrasound is usually the first choice, especially for intra-operative guidance, magnetic resonance imaging (MRI) plays an important role in the visualization and characterization of tumor before and after IRE in clinical and preclinical studies...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28336398/modulation-of-mammary-tumor-vascularization-by-mast-cells-ultrasonographic-and-histopathological-approaches
#11
Ana I Faustino-Rocha, Adelina Gama, Paula A Oliveira, Katrien Vanderperren, Jimmy H Saunders, Maria J Pires, Rita Ferreira, Mário Ginja
AIMS: The inhibition of mast cells' degranulation may be an approach to prevent the formation of new vessels during the mammary carcinogenesis. MATERIALS AND METHODS: Female Sprague-Dawley rats were randomly divided into five experimental groups. Mammary tumors were induced by intraperitoneal injection of N-methyl-N-nitrosourea (MNU). Animals from group II were treated with ketotifen for 18weeks immediately after the MNU administration, while animals from group III only received the ketotifen after the development of the first mammary tumor...
March 20, 2017: Life Sciences
https://www.readbyqxmd.com/read/28335472/detecting-breast-cancer-with-a-dual-modality-device
#12
Kamila Padia, Tania S Douglas, Lydia L Cairncross, Roland V Baasch, Christopher L Vaughan
Although mammography has been the gold standard for the early detection of breast cancer, if a woman has dense breast tissue, a false negative diagnosis may occur. Breast ultrasound, whether hand-held or automated, is a useful adjunct to mammography but adds extra time and cost. The primary aim was to demonstrate that our second-generation Aceso system, which combines full-field digital mammography (FFDM) and automated breast ultrasound (ABUS) in a single platform, is able to produce improved quality images that provide clinically meaningful results...
March 18, 2017: Diagnostics
https://www.readbyqxmd.com/read/28333964/optimizing-ultrasound-molecular-imaging-of-secreted-frizzled-related-protein-2-expression-in-angiosarcoma
#13
James K Tsuruta, Nicholas P Schaub, Juan D Rojas, Jason Streeter, Nancy Klauber-DeMore, Paul Dayton
Secreted frizzled related protein 2 (SFRP2) is a tumor endothelial marker expressed in angiosarcoma. Previously, we showed ultrasound molecular imaging with SFRP2-targeted contrast increased average video pixel intensity (VI) of angiosarcoma vessels by 2.2 ± 0.6 VI versus streptavidin contrast. We hypothesized that redesigning our contrast agents would increase imaging performance. Improved molecular imaging reagents were created by combining NeutrAvidin™-functionalized microbubbles with biotinylated SFRP2 or IgY control antibodies...
2017: PloS One
https://www.readbyqxmd.com/read/28333625/real-time-nonlocal-means-based-despeckling
#14
Lars H Breivik, Sten Roar Snare, Erik N Steen, Anne H Solberg
In this paper we propose a multiscale nonlocal means based despeckling method for medical ultrasound. The multiscale approach leads to large computational savings and improves despeckling results over single scale iterative approaches. We present two variants of the method. The first, denoted multiscale nonlocal means, yields uniform robust filtering of speckle both in structured and homogeneous regions. The second, denoted unnormalized multiscale nonlocal means, is more conservative in regions of structure assuring minimal disruption of salient image details...
March 22, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28333624/a-fast-and-robust-beamspace-adaptive-beamformer-for-medical-ultrasound-imaging
#15
Ali Mohades Deylami, Babak Mohammadzadeh Asl
Minimum variance beamformer (MVB) increases the resolution and contrast of medical ultrasound imaging compared to non-adaptive beamformers. These advantages come at the expense of high computational complexity that prevents this adaptive beamformer to be applied in a real-time imaging system. A new beamspace based on discrete cosine transform (DCT) is proposed in which the medical ultrasound signals can be represented with less dimensions compared to the standard beamspace. This is because of symmetric beampattern of the beams in the proposed beamspace compared to the asymmetric ones in the standard beamspace...
March 21, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28332442/ultrasound-imaging-in-the-diagnosis-of-large-vessel-vasculitis
#16
Michael Czihal, Christian Lottspeich, Ulrich Hoffmann
Nowadays noninvasive vascular imaging has an important role in the diagnostic work-up of the large vessel vasculitides (LVV), most importantly giant cell arteritis (GCA) and Takayasu arteritis. Among the imaging modalities available, ultrasound (US) has several important advantages, including low costs, rapid and repetitive availability without exposure to radiation, and high spatial resolution for assessment of large and medium-sized arteries. Therefore, US can be regarded the first line imaging method in suspected LVV...
March 23, 2017: VASA. Zeitschrift Für Gefässkrankheiten
https://www.readbyqxmd.com/read/28331942/contrast-enhanced-ultrasound-for-differentiating-benign-from-malignant-solid-small-renal-masses-comparison-with-contrast-enhanced-ct
#17
Shu-Ping Wei, Chao-Li Xu, Qing Zhang, Qi-Rui Zhang, Yan-E Zhao, Peng-Fei Huang, Ying-Dong Xie, Chang-Sheng Zhou, Fu-Li Tian, Bin Yang
PURPOSE: The study aimed to compare the diagnostic efficiency of contrast-enhanced ultrasound (CEUS) with that of contrast-enhanced computed tomography (CECT) in the evaluation of benign and malignant small renal masses (SRMs) (<4 cm) confirmed by pathology. METHODS: A total of 118 patients with 118 renal masses smaller than 4 cm diagnosed by both CEUS and CECT were enrolled in this study, including 25 benign lesions and 93 malignant lesions. All lesions were confirmed by histopathologic diagnosis after surgical resection...
March 22, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28330415/novel-detection-of-placental-insufficiency-by-magnetic-resonance-imaging-in-the-nonhuman-primate
#18
Jamie O Lo, Victoria H J Roberts, Matthias C Schabel, Xiaojie Wang, Terry K Morgan, Zheng Liu, Colin Studholme, Christopher D Kroenke, Antonio E Frias
The placenta is a vital organ necessary for healthy fetal development. Placental insufficiency creates an in utero environment where the fetus is at risk of insufficient oxygen or nutrient exchange. This is primarily caused by impairment of either maternal or fetal circulation or vascular thrombosis such as placental infarction. As a result of placental dysfunction, affected fetuses may be growth restricted, neurologically impaired, and at risk of increased morbidity and mortality. In a cohort of 4 pregnant Rhesus macaques, we describe antenatal detection of naturally occurring intrauterine growth restriction (IUGR) and aberrant fetal neurodevelopment in 1 animal...
January 1, 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28329905/-acute-abdominal-pain
#19
Peter Becker, Knut A Böttcher, Dieter Schilling
Acute abdominal pain is a potentially life-threatening condition that requires a concise and quick workup. Patient history, physical examination and laboratory studies help to establish a working diagnosis. If abdominal Ultrasound is not conclusive, contrast-enhanced Computertomography should be performed. Every patient should be treated aggressively for pain control and fluid substitution independent of the diagnostic workflow. In cases of severe disease, initiation of broad spectrum antibiotic therapy should be considered early...
March 2017: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/28329875/american-college-of-radiology-contrast-enhanced-ultrasound-liver-imaging-reporting-and-data-system-ceus-li-rads-for-the-diagnosis-of-hepatocellular-carcinoma-a-pictorial-essay
#20
Fabio Piscaglia, Stephanie R Wilson, Andrej Lyshchik, David Cosgrove, Christoph F Dietrich, Hyun-Jung Jang, Tae Kyoung Kim, Veronica Salvatore, Juergen Karl Willmann, Claude B Sirlin, Yuko Kono
No abstract text is available yet for this article.
March 22, 2017: Ultraschall in der Medizin
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