keyword
MENU ▼
Read by QxMD icon Read
search

Contrast ultrasound

keyword
https://www.readbyqxmd.com/read/28821993/segmentation-of-breast-ultrasound-images-based-on-active-contours-using-neutrosophic-theory
#1
Mahsa Lotfollahi, Masoumeh Gity, Jing Yong Ye, A Mahlooji Far
PURPOSE: Ultrasound imaging is an effective approach for diagnosing breast cancer, but it is highly operator-dependent. Recent advances in computer-aided diagnosis have suggested that it can assist physicians in diagnosis. Definition of the region of interest before computer analysis is still needed. Since manual outlining of the tumor contour is tedious and time-consuming for a physician, developing an automatic segmentation method is important for clinical application. METHODS: The present paper represents a novel method to segment breast ultrasound images...
August 18, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28819825/ceus-li-rads-algorithm-implementation-and-key-differences-from-ct-mri
#2
Stephanie R Wilson, Andrej Lyshchik, Fabio Piscaglia, David Cosgrove, Hyun-Jung Jang, Claude Sirlin, Christoph F Dietrich, Tae Kyoung Kim, Juergen K Willmann, Yuko Kono
Contrast-enhanced ultrasound (CEUS) is a specialized form of ultrasound (US) performed with an intravenous injection of microbubble contrast agents. It has been successfully used for a variety of applications including characterization of liver tumors. In April 2014, the American College of Radiology (ACR) convened a working group of international experts to develop ACR CEUS Liver Imaging Reporting and Data System (CEUS LI-RADS). An initial version of CEUS LI-RADS was published in August 2016. Although the CEUS LI-RADS concept and principles for liver lesion characterization, using dynamic contrast enhancement features, are similar to those for CT or MRI, there are significant differences between CT/MRI and CEUS LI-RADS...
August 17, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28819447/targeting-activated-platelets-a-unique-and-potentially-universal-approach-for-cancer-imaging
#3
May Lin Yap, James D McFadyen, Xiaowei Wang, Nicholas A Zia, Jan David Hohmann, Melanie Ziegler, Yu Yao, Alan Pham, Matthew Harris, Paul S Donnelly, P Mark Hogarth, Geoffrey A Pietersz, Bock Lim, Karlheinz Peter
Rationale The early detection of primary tumours and metastatic disease is vital for successful therapy and is contingent upon highly specific molecular markers and sensitive, non-invasive imaging techniques. We hypothesized that the accumulation of activated platelets within tumours is a general phenomenon and thus represents a novel means for the molecular imaging of cancer. Here we investigate a unique single chain antibody (scFv), which specifically targets activated platelets, as a novel biotechnological tool for molecular imaging of cancer...
2017: Theranostics
https://www.readbyqxmd.com/read/28818219/contemporary-outcomes-after-venography-guided-treatment-of-patients-with-may-thurner-syndrome
#4
Johnathon C Rollo, Steven M Farley, Adam Z Oskowitz, Karen Woo, Brian G DeRubertis
OBJECTIVE: Patients with May-Thurner syndrome (MTS) present with a spectrum of findings ranging from mild left leg edema to extensive iliofemoral deep venous thrombosis (DVT). Whereas asymptomatic left common iliac vein (LCIV) compression can be seen in a high proportion of normal individuals on axial imaging, the percentage of these persons with symptomatic compression is small, and debate exists about the optimal clinical and diagnostic criteria to treat these lesions in patients with symptomatic venous disease...
September 2017: Journal of Vascular Surgery. Venous and Lymphatic Disorders
https://www.readbyqxmd.com/read/28816891/computed-tomography-use-plateaus-among-children-with-emergency-visits-for-abdominal-pain
#5
Jahan Fahimi, Aaron E Kornblith, Hemal Kanzaria, Andrew Herring, Ralph C Wang
OBJECTIVES: Abdominal pain is a common pediatric complaint to emergency departments (EDs), and clinicians often rely on imaging for diagnosis. Studies have demonstrated an increase in computed tomography (CT) in this population. Following emphasis on radiation reduction by researchers and organizations, this study evaluates recent national trends in CT use among pediatric patients presenting to EDs with abdominal pain. METHODS: This is a cross-sectional analysis of ED patients 18 years or younger with chief complaint of abdominal pain in the National Hospital Ambulatory Medical Care Survey from 2008 to 2011...
August 14, 2017: Pediatric Emergency Care
https://www.readbyqxmd.com/read/28814080/drug-delivery-from-a-multi-faceted-ultrasound-contrast-agent-influence-of-shell-composition
#6
Lauren J Jablonowski, Nutte T Teraphongphom, Margaret A Wheatley
Many cancer therapy regimes still rely heavily on the systemic administration of toxic chemotherapeutic agents. Ultrasound contrast agents consisting of microbubbles (MB) have emerged as a drug delivery vehicle to overcome the challenges associated with systemic chemotherapy. Here we describe the development of non-immunogenic, functionalized polylactic acid (PLA) MB for use in targeted cancer therapy. Our previous studies have shown that the balance between acoustic behavior and improved immune avoidance was scalable and successful to different degrees with two different PEGylation methods, and was best achieved using incorporation of PEG-PLA at 5 wt% and for a LipidPEG at 1 wt%...
August 16, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28812002/image-guided-thermal-ablation-with-mr-based-thermometry
#7
REVIEW
Mingming Zhu, Ziqi Sun, Chin K Ng
Thermal ablation techniques such as radiofrequency, microwave, high intensity focused ultrasound (HIFU) and laser have been used as minimally invasive strategies for the treatment of variety of cancers. MR thermometry methods are readily available for monitoring thermal distribution and deposition in real time, leading to decrease of incidents of normal tissue damage around targeted lesion. HIFU and laser-induced thermal therapy (LITT) are the two widely accepted tumor ablation techniques because of their compatibility with MR systems...
June 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28808900/varying-ultrasound-power-level-to-distinguish-surgical-instruments-and-tissue
#8
Hongliang Ren, Banani Anuraj, Pierre E Dupont
We investigate a new framework of surgical instrument detection based on power-varying ultrasound images with simple and efficient pixel-wise intensity processing. Without using complicated feature extraction methods, we identified the instrument with an estimated optimal power level and by comparing pixel values of varying transducer power level images. The proposed framework exploits the physics of ultrasound imaging system by varying the transducer power level to effectively distinguish metallic surgical instruments from tissue...
August 15, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28808660/corrigendum-to-intraoperative-contrast-enhanced-ultrasound-evaluates-the-grade-of-glioma
#9
Ling-Gang Cheng, Wen He, Hong-Xia Zhang, Qian Song, Bin Ning, Hui-Zhan Li, Yan He, Song Lin
[This corrects the article DOI: 10.1155/2016/2643862.].
2017: BioMed Research International
https://www.readbyqxmd.com/read/28807450/role-of-contrast-enhanced-ultrasound-in-the-pre-operative-diagnosis-of-cervical-lymph-node-metastasis-in-patients-with-papillary-thyroid-carcinoma
#10
Yu-Rong Hong, Zhi-Yan Luo, Guo-Qiang Mo, Ping Wang, Qin Ye, Pin-Tong Huang
The objective of this study was to prospectively evaluate the diagnostic accuracy of contrast-enhanced ultrasonography (CEUS) in differentiating between benign and metastatic cervical lymph nodes in patients with papillary thyroid cancer (PTC). Three hundred nineteen cervical lymph nodes (162 metastatic from PTC and 157 benign) were evaluated using conventional ultrasonography (US) and CEUS before biopsy or surgery. Metastatic lymph nodes more often manifested centripetal or asynchronous perfusion, hyper-enhancement, heterogeneous enhancement, perfusion defects and ring-enhancing margins than benign lymph nodes at pre-operative CEUS (all p values < 0...
August 11, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28807449/non-invasive-intra-cardiac-pressure-measurements-using-subharmonic-aided-pressure-estimation-proof-of-concept-in-humans
#11
Jaydev K Dave, Sushmita V Kulkarni, Purva P Pangaonkar, Maria Stanczak, Maureen E McDonald, Ira S Cohen, Praveen Mehrotra, Michael P Savage, Paul Walinsky, Nicholas J Ruggiero, David L Fischman, David Ogilby, Carolyn VanWhy, Matthew Lombardi, Flemming Forsberg
This study evaluated the feasibility of employing non-invasive intra-cardiac pressure estimation using subharmonic signals from ultrasound contrast agents in humans. This institutional review board-approved proof-of-concept study included 15 consenting patients scheduled for left and right heart catheterization. During the catheterization procedure, Definity was infused intra-venously at 4-10 mL/min. Ultrasound scanning was performed with a Sonix RP using pulse inversion, three incident acoustic output levels and 2...
August 11, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28806319/transient-segmental-enhancement-of-pyogenic-liver-abscess-a-comparison-between-contrast-enhanced-ultrasound-and-computed-tomography
#12
Kun Sun, Wei Zhu, Yan Luo, Yongzhong Li, Xiang Zhou
OBJECTIVE: This study aimed to investigate the correlation between the transient segmental enhancement (TSE) of liver abscesses on contrast-enhanced ultrasound (CEUS) imaging and contrast-enhanced computed tomography (CT) scans. METHODS: In total, 42 abscesses in 38 patients were evaluated with real-time CEUS and contrast-enhanced CT imaging. The CT imaging and CEUS examinations were performed within one to 2 days of each other in all cases. The initial reports of the observations of TSE on CEUS scans were correlated later with the findings of TSE on contrast-enhanced CT images...
August 12, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28806199/does-late-hip-dysplasia-occur-after-normal-ultrasound-screening-in-breech-babies
#13
Andrew R Morris, Joanna M C Thomas, Isabel C Reading, Nicholas M P Clarke
BACKGROUND: Recent literature has raised concern regarding the occurrence of late dysplasia after normal screening in breech babies. One paper states a late dysplasia incidence of 29%. This finding is in contrast with other published work, which suggests breech presentation is predictive of spontaneous stabilization of the unstable neonatal hip. We decided to identify the rate of late dysplasia after normal screening in our patient cohort and also to investigate the use of a prophylactic abduction diaper...
August 11, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28806175/point-of-care-ultrasound-facilitated-detection-of-femoral-occlusive-septic-emboli-during-mitral-valve-surgery-a-case-report
#14
Melissa L Bellomy, Susan Eagle, Mias Pretorius, Ben R Barton, Yafen Liang
Acute lower extremity ischemia from septic emboli is a surgical emergency. Timely diagnosis and management are critical to improve patient outcome. However, traditional diagnostic modalities such as intraoperative angiogram are time-consuming, require special equipment and personnel, and introduce contrast exposure for critically ill patients. There are limited reports of utilization of point-of-care ultrasound to detect peripheral septic emboli. We present a case where femoral occlusive septic emboli were identified by point-of-care ultrasound after mitral valve replacement...
August 10, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28803939/bubble-generating-nano-lipid-carriers-for-ultrasound-ct-imaging-guided-efficient-tumor-therapy
#15
Nan Zhang, Jia Li, Ruirui Hou, Jiangnan Zhang, Pei Wang, Xinyang Liu, Zhenzhong Zhang
Ideal therapeutic effectiveness of chemotherapy is obtained only when tumor cells are exposed to a maximal drug concentration, which is often hindered by dose-limiting toxicity. We designed a bubble-generating liposomal delivery system by introducing ammonium bicarbonate and gold nanorods into folic acid-conjugated liposomes to allow both multimodal imaging and the local release of drug (doxorubicin) with hyperthermia. The key component, ammonium bicarbonate, allows a controlled, rapid release of doxorubicin to provide an effective drug concentration in the tumor microenvironment...
August 10, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28801387/microbubbles-and-ultrasound-accelerated-thrombolysis-must-for-peripheral-arterial-occlusions-protocol-for-a-phase-ii-single-arm-trial
#16
Harm P Ebben, Johanna H Nederhoed, Rutger J Lely, Willem Wisselink, Kakkhee Yeung
INTRODUCTION: Acute peripheral arterial occlusions can be treated with intra-arterial catheter-directed thrombolysis as an alternative to surgical thromboembolectomy. Although less invasive, this treatment is time-consuming and carries a significant risk of haemorrhagic complications. Contrast-enhanced ultrasound using microbubbles could accelerate dissolution of thrombi by thrombolytic medications due to mechanical effects caused by oscillation; this could allow for lower dosages of thrombolytics and faster thrombolysis, thereby reducing the risk of haemorrhagic complications...
August 11, 2017: BMJ Open
https://www.readbyqxmd.com/read/28799160/intramuscular-perfusion-response-in-delayed-onset-muscle-soreness-doms-a-quantitative-analysis-with-contrast-enhanced-ultrasound-ceus
#17
Marion Kellermann, Rafael Heiss, Bernd Swoboda, Kolja Gelse, Jürgen Freiwald, Casper Grim, Armin Nagel, Michael Uder, Dane Wildner, Thilo Hotfiel
The purpose of this study was to analyse intramuscular perfusion response in ultrastructural muscle lesions, by applying contrast-enhanced ultrasound (CEUS) to a delayed onset muscle soreness (DOMS) model. Results of this analysis were compared to high-resolution 3 Tesla MRI T2-weighted sequences. 14 healthy participants were recruited. Average perfusion parameters, represented as Peak enhancement (contrast agent inflow) and wash-in area under curve (WiAUC) of the gastrocnemius (GM) and soleus muscle (SM) were assessed before (baseline) and 60 h after inducing DOMS by eccentric exercise...
August 10, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28799151/contrast-enhanced-ultrasound-features-of-hepatocellular-carcinoma-not-detected-during-the-screening-procedure
#18
Yi Dong, Wen-Ping Wang, Feng Mao, Christoph Dietrich
Aim The aim of this retrospective study is to report on the characteristics of contrast-enhanced ultrasound (CEUS) of primarily not detected hepatocellular carcinoma (HCC) during the screening procedure of patients at risk. Methods Sixty-four patients with a finally solitary and histologically proven HCC not detected HCC during the screening procedure were retrospectively analyzed. Most of HCC lesions (90.6 %, 58/64) measured < 20 mm in diameter. All HCC lesions were not detected during the initial screening procedure but suspected using contrast-enhanced magnetic resonance imaging...
August 2017: Zeitschrift Für Gastroenterologie
https://www.readbyqxmd.com/read/28799124/comparison-between-free-breathing-radial-vibe-on-3-t-mri-and-endoscopic-ultrasound-for-preoperative-t-staging-of-resectable-oesophageal-cancer-with-histopathological-correlation
#19
Jinrong Qu, Hongkai Zhang, Zhaoqi Wang, Fengguang Zhang, Hui Liu, Zhidan Ding, Yin Li, Jie Ma, Zhongxian Zhang, Shouning Zhang, Yafeng Dong, Lina Jiang, Wei Zhang, Robert Grimm, Berthold Kiefer, Ihab R Kamel, Jianjun Qin, Hailiang Li
OBJECTIVES: To compare the T staging of resectable oesophageal cancer (OC) using radial VIBE (r-VIBE) and endoscopic ultrasound (EUS) with pathological confirmation of the T stage. METHODS: Forty-three patients with endoscopically proven OC and indeterminate T1/T2/T3/T4a stage by computed tomography (CT) and EUS were imaged on a 3-T magnetic resonance imaging (MRI) scanner. T stage was scored on MRI and EUS by two independent radiologists and one endoscopist, respectively, and compared with postoperative pathological findings...
August 10, 2017: European Radiology
https://www.readbyqxmd.com/read/28799090/prostate-cancer-detection-among-readers-with-different-degree-of-experience-using-ultra-high-b-value-diffusion-weighted-imaging-is-a-non-contrast-protocol-sufficient-to-detect-significant-cancer
#20
D Hausmann, N Aksöz, J von Hardenberg, T Martini, N Westhoff, S Buettner, S O Schoenberg, P Riffel
AIM: To evaluate the accuracy of a T2-weighted (T2w) - and a parallel transmit zoomed b = 2000 s/mm2 (b2000) - diffusion-weighted imaging sequence among three readers with different degrees of experience for prostate cancer (Pca) detection. METHODS: Ninety-three patients with suspected Pca were enrolled. For b2000 a two-dimensional spatially-selective RF pulse using an echo-planar transmit trajectory was applied, and the field of view (FOV) was reduced to one-third...
August 10, 2017: European Radiology
keyword
keyword
58653
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"