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Contrast enhanced ultrasound

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https://www.readbyqxmd.com/read/28214036/impact-of-filling-gas-on-subharmonic-emissions-of-phospholipid-ultrasound-contrast-agents
#1
Emma Kanbar, Damien Fouan, Charles A Sennoga, Alexander A Doinikov, Ayache Bouakaz
Subharmonic signals backscattered from gas-filled lipid-shelled microbubbles have generated significant research interest because they can improve the detection and sensitivity of contrast-enhanced ultrasound imaging. However, the emission of subharmonic signals is strongly characterized by a temporal dependence, the origins of which have not been sufficiently elucidated. The features that influence subharmonic emissions need to be identified not only to better develop next-generation microbubble contrast agents, but also to develop more efficient subharmonic imaging (SHI) modes and therapeutic strategies...
February 14, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28211805/diagnostic-accuracy-and-interobserver-variability-of-dynamic-vascular-pattern-dvp-in-primary-liver-malignancies-a-simple-semiquantitative-tool-for-the-analysis-of-contrast-enhancement-patterns
#2
B Schellhaas, M J Waldner, R S GÖrtz, F Vitali, Ch Kielisch, L Pfeifer, D Strobel, R Janka, M F Neurath, D Wildner
BACKGROUND: Contrast-enhanced ultrasound (CEUS) is a valuable tool in the diagnostic approach of focal liver lesions, but occasionally subjective and observer-dependent. Semiquantitative evaluation of dynamic CEUS (DCEUS) with standardised software programmes such as Dynamic Vascular Pattern (DVP) could help to improve diagnostic accuracy and objectivity in liver tumour assessment. OBJECTIVES: The present study aimed at evaluation of diagnostic accuracy of DVP in a clinical setting...
February 17, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28211204/evaluation-of-the-enhanced-permeability-and-retention-effect-in-the-early-stages-of-lymph-node-metastasis
#3
Mamoru Mikada, Ariunbuyan Sukhbaatar, Yoshinobu Miura, Sachiko Horie, Maya Sakamoto, Shiro Mori, Tetsuya Kodama
Most solid cancers spread to new sites via the lymphatics before hematogenous dissemination. However, only a small fraction of an intravenously administered anti-cancer drug enters the lymphatic system to reach metastatic lymph nodes (LNs). Here, we show that the enhanced permeability and retention (EPR) effect is not induced during the early stages of LN metastasis. Luciferase-expressing tumor cells were injected into the subiliac LN of the MXH10/Mo-lpr/lpr mouse to induce metastasis to the proper axillary LN (PALN)...
February 17, 2017: Cancer Science
https://www.readbyqxmd.com/read/28210800/preservation-of-the-endometrial-enhancement-after-magnetic-resonance-imaging-guided-high-intensity-focused-ultrasound-ablation-of-submucosal-uterine-fibroids
#4
Young-Sun Kim, Tae-Joong Kim, Hyo Keun Lim, Hyunchul Rhim, Sin-Ho Jung, Joong Hyun Ahn, Jeong-Won Lee, Byoung-Gie Kim
OBJECTIVE: To evaluate the integrity of endometrial enhancement after magnetic resonance imaging-guided high-intensity focused ultrasound (MR-HIFU) ablation of submucosal uterine fibroids based on contrast-enhanced MRI findings, and to identify the risk factors for endometrial impairment. METHODS: In total, 117 submucosal fibroids (diameter: 5.9 ± 3.0 cm) in 101 women (age: 43.6 ± 4.4 years) treated with MR-HIFU ablation were retrospectively analysed...
February 16, 2017: European Radiology
https://www.readbyqxmd.com/read/28210085/macro-and-microcirculation-patterns-of-intrahepatic-blood-flow-changes-in-patients-with-hereditary-hemorrhagic-telangiectasia
#5
Roland C Schelker, Ana P Barreiros, Christina Hart, Wolfgang Herr, Ernst-Michael Jung
AIM: To evaluated vascular dynamic processes in the liver of hereditary hemorrhagic telangiectasia (HHT) patients by ultrasound (US) considering quantitative analytic methods. METHODS: The imaging features on US and contrast-enhanced ultrasound (CEUS) in 18 patients diagnosed with HHT were retrospectively analyzed. Regarding CEUS, real-time contrast harmonic imaging and sulfur hexafluoride-filled microbubbles were used. RESULTS: HVaMs were identified in all 18 patients...
January 21, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28209559/irreversible-electroporation-for-the-ablation-of-renal-cell-carcinoma-a-prospective-human-in-vivo-study-protocol-ideal-phase-2b
#6
Mara Buijs, Krijn P van Lienden, Peter Gk Wagstaff, Matthijs Jv Scheltema, Daniel M de Bruin, Patricia J Zondervan, Otto M van Delden, Ton G van Leeuwen, Jean Jmch de la Rosette, M Pilar Laguna
BACKGROUND: Irreversible electroporation (IRE) is an emerging technique delivering electrical pulses to ablate tissue, with the theoretical advantage to overcome the main shortcomings of conventional thermal ablation. Recent short-term research showed that IRE for the ablation of renal masses is a safe and feasible treatment option. In an ablate and resect design, histopathological analysis 4 weeks after radical nephrectomy demonstrated that IRE-targeted renal tumors were completely covered by ablation zone...
February 16, 2017: JMIR Research Protocols
https://www.readbyqxmd.com/read/28203135/successful-treatment-of-hepatocellular-carcinoma-complicated-by-fanconi-anemia
#7
Koji Takahashi, Eiichiro Suzuki, Masayuki Yokoyama, Masanori Inoue, Toru Wakamatsu, Tomoko Saito, Yuko Kusakabe, Sadahisa Ogasawara, Yoshihiko Ooka, Akinobu Tawada, Yuhei Nagao, Chiaki Nakaseko, Tetsuhiro Chiba
A 42-year-old woman with liver tumors was referred to our hospital. Her condition was complicated by Fanconi anemia, and she had undergone total laryngectomy 8 years ago. On admission, contrast-enhanced computed tomography revealed hypervascular tumors in the right hepatic lobe. Ultrasound-guided tumor biopsy revealed that the tumor comprised moderately differentiated hepatocellular carcinoma. Although the patient exhibited preserved liver function (Child-Pugh A), complete blood count revealed severe pancytopenia...
January 2017: Case Reports in Gastroenterology
https://www.readbyqxmd.com/read/28202349/muscle-ultrasound-and-sarcopenia-in-older-individuals-a-clinical-perspective
#8
REVIEW
Andrea Ticinesi, Tiziana Meschi, Marco V Narici, Fulvio Lauretani, Marcello Maggio
INTRODUCTION: A precise quantitative measurement of skeletal muscle mass is fundamental for diagnosing sarcopenia in older individuals. The current techniques of assessment, including dual-energy x-ray absorptiometry (DXA), bioimpedance analysis (BIA), and magnetic resonance imaging (MRI) are either difficult to perform in everyday clinical practice or biased by concurrent clinical confounders. B-mode muscle ultrasound can be helpful in assessing muscle mass and architecture, and thus possibly useful for diagnosing or screening sarcopenia...
February 12, 2017: Journal of the American Medical Directors Association
https://www.readbyqxmd.com/read/28195441/imaging-of-the-vasa-nervorum-using-contrast-enhanced-ultrasound
#9
Adnan I Qureshi, Muhammad A Saleem, Asad Ahrar, Faisal Raja
INTRODUCTION: We describe the use of intravenous contrast-enhanced ultrasonography to study vasa nervorum using contrast-enhanced ultrasound. METHODS: We imaged the median, femoral, or sciatic nerves in 4 patients in longitudinal plane using high-resolution ultrasound after intravenous bolus of activated Perflutren lipid microspheres. The images were acquired as photopic images (in brown color) in real time using 2-dimensional B-Flow mode scan within a selected region of interest...
February 14, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28194993/preoperative-prediction-of-papillary-thyroid-microcarcinoma-via-multiparameter-ultrasound
#10
Hui Juan Ma, Jing Chun Yang, Zhen Peng Leng, Ying Chang, Hua Kang, Liang Hong Teng
Background Accurate diagnosis of papillary thyroid microcarcinoma (PTMC) is important for further management. Ultrasound (US) is the most frequently used imaging modality for PTMC. Purpose To evaluate the diagnostic value of conventional US, contrast-enhanced ultrasound (CEUS) and real-time elastography (RTE) for patients with PTMC. Material and Methods In total, 135 patients with subcentimeter thyroid nodules who underwent conventional US, CEUS, and RTE before surgery were enrolled. A multivariate logistic regression analysis was performed to assess the independent predictors of PTMC...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28193644/tumour-thrombus-of-the-inferior-vena-cava-extending-into-the-right-atrium-in-the-setting-of-colon-cancer
#11
Daniel Meyers, Nancy A Nixon, Angela Franko, Danny Ng, Vincent C Tam
Tumour thrombus is seen in renal cell and hepatocellular carcinoma, but is rarely reported in colorectal cancer. A woman aged 46 years, with metastatic colonic adenocarcinoma, was found to have a large mass in the inferior vena cava (IVC) extending into the right atrium. Although this lesion was initially thought to be bland thrombus, imaging with contrast-enhanced CT scan and contrast-enhanced ultrasound supported the diagnosis of tumour thrombus. Despite the large size of the lesion, the patient was asymptomatic...
February 13, 2017: BMJ Case Reports
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
#12
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/28191530/contrast-enhanced-ultrasound-a-promising-method-for-renal-microvascular-perfusion-evaluation
#13
REVIEW
Ling Wang, Chandra Mohan
This article reviews the application of contrast-enhanced ultrasound (CEUS) in gauging renal microvascular perfusion in diverse renal diseases. The unique nature of the contrast agents used in CEUS provides real-time and quantitative imaging of the vasculature. In addition to the traditional use of CEUS for evaluation of kidney masses, it also emerges as a safe and effective imaging approach to assess microvascular perfusion in diffuse renal lesions, non-invasively. Although the precise CEUS parameters that may best predict disease still warrant systematic evaluation, animal models and limited clinical trials in humans raise hopes that CEUS could outcompete competing modalities as a first-line tool for assessing renal perfusion non-invasively, even in ailments such as acute kidney injury and chronic kidney disease...
September 1, 2016: Journal of Translational Internal Medicine
https://www.readbyqxmd.com/read/28186881/bayesian-quantification-of-contrast-enhanced-ultrasound-images-with-adaptive-inclusion-of-an-irreversible-component
#14
Gaia Rizzo, Matteo Tonietto, Marco Castellaro, Bernd Raffeiner, Alessandro Coran, Ugo Fiocco, Roberto Stramare, Enrico Grisan
Contrast Enhanced Ultrasound (CEUS) is a sensitive imaging technique to assess tissue vascularity and it can be particularly useful in early detection and grading of arthritis. In a recent study we have shown that a Gamma-variate can accurately quantify synovial perfusion and it is flexible enough to describe many heterogeneous patterns. However, in some cases the heterogeneity of the kinetics can be such that even the Gamma model does not properly describe the curve, with a high number of outliers.
December 8, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28186627/value-of-three-section-contrast-enhanced-transrectal-ultrasonography-in-the-detection-of-prostate-cancer
#15
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/28184161/low-intensity-focused-ultrasound-lifu-induced-acoustic-droplet-vaporization-in-phase-transition-perfluoropentane-nanodroplets-modified-by-folate-for-ultrasound-molecular-imaging
#16
Jianxin Liu, Tingting Shang, Fengjuan Wang, Yang Cao, Lan Hao, JianLi Ren, Haitao Ran, Zhigang Wang, Pan Li, Zhiyu Du
The commonly used ultrasound (US) molecular probes, such as targeted microbubbles and perfluorocarbon emulsions, present a number of inherent problems including the conflict between US visualization and particle penetration. This study describes the successful fabrication of phase changeable folate-targeted perfluoropentane nanodroplets (termed FA-NDs), a novel US molecular probe for tumor molecular imaging with US. Notably, these FA-NDs can be triggered by low-intensity focused US (LIFU) sonication, providing excellent US enhancement in B-mode and contrast-enhanced US mode in vitro...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28180205/contrast-enhanced-ultrasound-of-a-rare-case-of-peliosis-hepatis
#17
Alexander Loizides, Bernhard Glodny, Heinz Zoller, Bettina Gudrun Zelger, Daniel Junker, Benjamin Henninger, Daniel Putzer, Hannes Gruber
Peliosis hepatis is a rare benign disorder of the liver, histologically characterized by blood-filled cystic cavities of various sizes and irregular shapes, communicating with the hepatic sinusoids. Only a few cases of peliosis hepatis have been described using contrast enhanced ultrasound showing admittedly various dynamic enhancement patterns. We present a case of peliosis hepatis with a typical target-sign enhancement depicted by means of contrast enhanced ultrasound.
January 31, 2017: Medical Ultrasonography
https://www.readbyqxmd.com/read/28177278/does-spontaneous-remission-occur-in-polyarteritis-nodosa-%C3%A2
#18
Simon Beyaert, Menno Pruijm, Salah Dine Qanadli, Peter Vollenweider, Matthieu Halfon
BACKGROUND: Polyarteritis nodosa (PAN) is a systemic vasculitis involving mainly medium-sized arteries and, rarely, small-sized arteries. The diagnosis is principally based on clinical exams, biopsy of an affected organ, and/or arteriography of renal or mesenteric arteries. Once diagnosed, immunosuppressive agents, such as glucocorticoids and cyclophosphamide, are generally introduced as soon as possible. Whether spontaneous remission of PAN occurs is therefore largely unknown. PRESENTATION: We describe the case of a 51-year-old woman who presented with a 4-day-history of intense pain in her left flank, hypertension, fever, microscopic hematuria, and acute renal failure...
February 8, 2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28176498/successful-laparoscopic-distal-pancreatectomy-for-a-large-solid-pseudopapillary-neoplasm-a-case-report
#19
Seiichiro Tada, Taku Iida, Takayuki Anazawa, Shintaro Yagi, Satoru Seo, Toshihiko Masui, Toshimi Kaido, Kyoichi Takaori, Shinji Uemoto
A 30-year-old Japanese woman presented at our hospital with a pancreatic tumor. Contrast-enhanced CT revealed a tumor with a 12-cm diameter in the pancreatic body and tail. In the preoperative setting, endoscopic ultrasound-guided fine-needle aspiration permitted a histopathological diagnosis of solid pseudopapillary neoplasm. Twhe patient underwent laparoscopic distal pancreatectomy with splenectomy. Our procedure involved three steps. Firstly, the splenic artery was occluded to block inflow of blood to the tumor...
February 8, 2017: Asian Journal of Endoscopic Surgery
https://www.readbyqxmd.com/read/28174490/clinical-value-of-contrast-enhanced-ultrasound-in-improving-diagnostic-accuracy-rate-of-transthoracic-biopsy-of-anterior-medial-mediastinal-lesions
#20
Jingjing Fu, Wei Yang, Song Wang, Jing Bai, Hao Wu, Haiyue Wang, Kun Yan, Minhua Chen
OBJECTIVE: To evaluate the clinical value of contrast-enhanced ultrasound (CEUS) in transthoracic biopsy of anterior-medial mediastinal lesions. METHODS: A total of 123 patients with anterior or middle mediastinum lesions required ultrasound guided transthoracic biopsy for pathological diagnosis. Among them, 72 patients received CEUS examinations before biopsy. After CEUS, 8 patients were excluded from biopsy and the rest 64 patients underwent biopsy (CEUS group)...
December 2016: Chinese Journal of Cancer Research, Chung-kuo Yen Cheng Yen Chiu
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