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Intravascular ultrasound

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https://www.readbyqxmd.com/read/28333640/integrated-hifu-drive-system-on-a-chip-for-cmut-based-catheter-ablation-system
#1
Omid Farhanieh, Ali Sahafi, Rupak Bardhan Roy, Arif Sanli Ergun, Ayhan Bozkurt
Conventional High Intensity Focused Ultrasound (HIFU) is a therapeutic modality which is extracorporeally administered. In applications where a relatively small HIFU lesion is required, an intravascular HIFU probe can be deployed to the ablation site. In this paper, we demonstrate the design and implementation a fully integrated HIFU drive system on a chip to be placed on a 6 Fr catheter probe. An 8-element capacitive micromachined ultrasound transducer (CMUT) ring array of 2 mm diameter has been used as the ultrasound source...
March 20, 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28330651/serial-assessment-of-tissue-precursors-and%C3%A2-progression-of-coronary-calcification-analyzed-by-fusion-of-ivus-and-oct-5-year-follow-up-of-scaffolded-and-nonscaffolded-arteries
#2
Yaping Zeng, Hiroki Tateishi, Rafael Cavalcante, Erhan Tenekecioglu, Pannipa Suwannasom, Yohei Sotomi, Carlos Collet, Shaoping Nie, Hans Jonker, Jouke Dijkstra, Maria D Radu, Lorenz Räber, Dougal R McClean, Robert-Jan van Geuns, Evald H Christiansen, Therese Fahrni, Jacques Koolen, Yoshinobu Onuma, Nico Bruining, Patrick W Serruys
OBJECTIVES: The aim of this study was to assess calcium growth with fused grayscale intravascular ultrasound (IVUS), IVUS-virtual histology, and optical coherence tomography (OCT) from baseline to 5-year follow-up in patients treated with bioresorbable vascular scaffolds. BACKGROUND: IVUS and OCT have individual strengths in assessing plaque composition and volume. Fusion of images obtained using these methods could potentially aid in coronary plaque assessment...
March 10, 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28329155/pulmonary-arterial-stiffness-indices-assessed-by-intravascular-ultrasound-in-children-with-early-pulmonary-vascular-disease-prediction-of-advanced-disease-and-mortality-during-20-year-follow-up
#3
Mark-Jan Ploegstra, Jody G M Brokelman, Jolien W Roos-Hesselink, Johannes M Douwes, Lenny M van Osch-Gevers, Elke S Hoendermis, Annemien E van den Bosch, Maarten Witsenburg, Beatrijs Bartelds, Hans L Hillege, Rolf M F Berger
Aims: Prognosis in children with pulmonary vascular disease (PVD) is closely linked to right ventricular (RV) failure due to increased RV-afterload. Pulmonary arterial (PA) stiffening is known to occur early in the course of PVD and constitutes a main component of RV-afterload. This study aimed to evaluate the clinical value of PA-stiffness in children with PVD by determining its association with advanced pulmonary arterial hypertension (PAH) and mortality at long-term follow-up. Methods and results: Forty-one children with various stages of arterial PVD, defined as mean PA-pressure  ≥20 mmHg and/or pulmonary-to-systemic flow-ratio  ≥1...
March 6, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28327450/impact-of-attenuated-signal-plaque-observed-by-intravascular-ultrasound-on-vessel-response-after-drug-eluting-stent-implantation
#4
Hideki Kitahara, Katsuhisa Waseda, Kenji Sakamoto, Ryotaro Yamada, Ching-Chang Huang, Daisaku Nakatani, Kenji Sakata, Osami Kawarada, Paul G Yock, Yutaka Matsuyama, Hiroyoshi Yokoi, Masato Nakamura, Toshiya Muramatsu, Shinsuke Nanto, Peter J Fitzgerald, Yasuhiro Honda
BACKGROUND AND AIMS: The aim of this study was to investigate the impact of attenuated-signal plaque (ASP) observed by intravascular ultrasound (IVUS) on vessel response after drug-eluting stent implantation. METHODS: Data were derived from the IVUS cohort of the J-DESsERT trial comparing paclitaxel- and sirolimus-eluting stents. Serial IVUS analysis (pre- and post-intervention, and 8-month follow-up) was performed in 136 non-AMI lesions. ASP was defined as hypoechoic plaque with ultrasound attenuation without calcification...
February 20, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28322592/intravascular-pulmonary-venous-ultrasound-imaging-for-catheter-ablation-of-atrial-fibrillation
#5
Gabriel Cismaru, Serban Schiau, Lucian Muresan, Radu Rosu, Mihai Puiu, Dana Pop, Dumitru Zdrenghea
Atrial fibrillation is the most common cardiac arrhythmia. The development of electroanatomical mapping is an increase demand for advanced intracardiac imaging techniques of the left atrium and pulmonary veins. IVUS can demonstrate quantitative changes like lumen and wall thickness as well as qualitative changes of the pulmonary or coronary arteries wall. IVUS could also provide relevant real time imaging of the atrial and pulmonary venous wall during catheter ablation. Areas covered: The Medline and Embase databases were searched for preclinical and clinical studies of IVUS in patients with ablation of atrial fibrillation or left atrial arrhythmias...
March 21, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28321242/aggressive-plaque-modification-with-rotational-atherectomy-and-cutting-balloon-for-optimal-stent-expansion-in-calcified-lesions
#6
Zhe Tang, Jing Bai, Shao-Ping Su, Pui-Wai Lee, Liang Peng, Tao Zhang, Ting Sun, Jing-Guo Nong, Tian-De Li, Yu Wang
OBJECTIVE: To evaluate the factors affecting optimal stent expansion in calcified lesions treated by aggressive plaque modification with rotational atherectomy (RA) and a cutting balloon (CB). METHODS: From January 2014 to May 2015, 92 patients with moderate to severe coronary calcified lesions underwent rotational atherectomy and intravascular ultrasound imaging at Chinese PLA General Hospital (Beijing, China) were included in this study. They were divided into a rotational artherectomy combined with cutting balloon (RACB) group (46 patients treated with RA followed by CB angioplasty) and an RA group (46 patients treated with RA followed by plain balloon angioplasty)...
December 2016: Journal of Geriatric Cardiology: JGC
https://www.readbyqxmd.com/read/28317789/intravascular-ultrasound-and-optical-coherence-tomography-images-for-direct-right-coronary-artery-injury-after-tricuspid-valve-annuloplasty
#7
Junsuke Shibuya, Nobuaki Kobayashi, Noritake Hata, Shunsuke Uetake, Masahiro Fujii, Ryuzo Bessho, Wataru Shimizu
No abstract text is available yet for this article.
March 20, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28303659/invasive-characterization-of-atherosclerotic-plaque-in-patients-with-peripheral-arterial-disease-using-near-infrared-spectroscopy-intravascular-ultrasound
#8
Amr E Abbas, Sibin K Zacharias, James A Goldstein, Ivan D Hanson, Robert D Safian
OBJECTIVES: We describe the characteristics of atherosclerotic plaque in patients with peripheral arterial disease (PAD) using near-infrared spectroscopy-intravascular ultrasound (NIRS-IVUS) BACKGROUND: Imaging and autopsy studies have described atherosclerotic plaque in different vascular beds, including varying degrees of lipid, fibrosis, and calcification. Recently, NIRS has been validated as an accurate method for detecting lipid-core plaque (LCP) in the coronary circulation. Invasive evaluation of plaque composition using NIRS-IVUS has not been reported in different peripheral arterial circulations...
March 17, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28290832/-computed-tomography-in-the-evaluation-of-coronary-atherosclerotic-plaques-comparison-with-intravascular-ultrasound
#9
T N Veselova, M S Shabanova, V M Mironov, I N Merkulova, S K Ternovoy
PURPOSE: Determination of computed tomography angiography (CTA) informativeness in assessment of state of atherosclerotic coronary plaque (ACP) and identification of signs of its instability compared with intravascular ultrasound (IVUS). MATERIALS AND METHODS: Coronary CTA was carried out in 52 patients with clinical presentation of non-ST elevation (NSTE) acute coronary syndrome on the first day of hospitalization. ACPs were identified in 32 of 52 patients (61...
January 2017: Kardiologiia
https://www.readbyqxmd.com/read/28289480/ultrasound-elastography-for-determination-of-the-age-of-venous-thrombi-evaluation-of-thrombus-evolution-in-patients-after-sclerotherapy
#10
Łukasz Paluch, Ewa Nawrocka-Laskus, Agnieszka Dąbrowska, Tadeusz Popiela, Jerzy Walecki
BACKGROUND: Venous thrombosis is a multicausal disease involving intravenous clot formation. It may occur spontaneously or after provoking events, such as traumatic injuries to the pelvis, upper and lower extermities, immobilization, intravascular procedures, including venous catheterization or injection. Color Doppler ultrasonography is a rapid and non-invasive technique for evaluation of venous disease. It is a very sensitive method for detection of thrombi, but has some limitations, e...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28285329/intravascular-ultrasound-to-assess-for-baffle-stenosis-after-mustard-procedure
#11
Lane B Benes, Jonathan R Rosenberg, Cevher Ozcan, Tharian S Cherian, Atman P Shah
No abstract text is available yet for this article.
March 11, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28283423/echolucency-of-the-carotid-artery-is-associated-with-short-term-plaque-progression-and-positive-remodeling-in-the-culprit-coronary-artery-in-ami-survivors
#12
Mika Futamata, Satoshi Matsuoka, Takuya Shimizu, Toru Yoshizaki, Jun-Ei Obata, Takamitsu Nakamura, Daisuke Fujioka, Yosuke Watanabe, Kazuto Nakamura, Kazuhiro Watanabe, Kiyotaka Kugiyama
BACKGROUND: Rapid plaque progression and positive remodeling are recognized as vulnerable coronary plaque characteristics. This study examined whether serial carotid ultrasonography might be of value for assessment of coronary plaque progression and positive remodeling, measured by serial intravascular ultrasound (IVUS), in survivors of acute myocardial infarction (AMI). METHODS: Thirty-nine patients with AMI had repeated examinations by IVUS of culprit coronary arteries and echolucency of the coronary artery on admission (1st test) and 6 months later (2nd test)...
March 7, 2017: Journal of Cardiology
https://www.readbyqxmd.com/read/28279437/coronary-plaque-characteristics-in-hemodialysis-dependent-patients-as-assessed-by-optical%C3%A2-coherence-tomography
#13
Chee Yang Chin, Mitsuaki Matsumura, Akiko Maehara, Wenbin Zhang, Cheolmin Tetsumin Lee, Myong Hwa Yamamoto, Lei Song, Yasir Parviz, Nisha B Jhalani, Sumit Mohan, Lloyd E Ratner, David J Cohen, Ori Ben-Yehuda, Gregg W Stone, Richard A Shlofmitz, Tsunekazu Kakuta, Gary S Mintz, Ziad A Ali
Coronary arteries in patients with chronic kidney disease (CKD) have been shown to exhibit more extensive atherosclerosis and calcium. We aimed to assess characteristics of coronary plaque in hemodialysis (HD)-dependent patients using optical coherence tomography (OCT). This was a multicenter, retrospective study of 124 patients with stable angina who underwent OCT imaging. Sixty-two HD-dependent patients who underwent pre-intervention OCT for coronary artery disease were compared 1:1 with a cohort of patients without CKD, matched for age, diabetes mellitus, gender, and culprit vessel...
February 9, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28278194/spectral-tissue-sensing-to-identify-intra-and-extravascular-needle-placement-a-randomized-single-blind-controlled-trial
#14
Andrea J R Balthasar, Geert-Jan van Geffen, Marjolein van der Voort, Gerald W Lucassen, Stefan Roggeveen, Ivar J Bruaset, Joergen Bruhn
Safe vascular access is a prerequisite for intravenous drug admission. Discrimination between intra- and extravascular needle position is essential for procedure safety. Spectral tissue sensing (STS), based on optical spectroscopy, can provide tissue information directly from the needle tip. The primary objective of the trial was to investigate if STS can reliably discriminate intra-vascular (venous) from non-vascular punctures. In 20 healthy volunteers, a needle with an STS stylet was inserted, and measurements were performed for two intended locations: the first was subcutaneous, while the second location was randomly selected as either subcutaneous or intravenous...
2017: PloS One
https://www.readbyqxmd.com/read/28274573/in-hospital-and-1-year-outcomes-of-rotational-atherectomy-and-stent-implantation-in-patients-with-severely-calcified-unprotected-left-main-narrowings-from-the-multicenter-rotate-registry
#15
Alfonso Ielasi, Hiroyoshi Kawamoto, Azeem Latib, Giacomo G Boccuzzi, Gennaro Sardella, Roberto Garbo, Emanuele Meliga, Fabrizio D'Ascenzo, Patrizia Presbitero, Sunao Nakamura, Antonio Colombo
Heavily calcified unprotected left main (ULM) disease continues to be a challenging situation and represent a high-risk subset for interventional cardiologist. To date, there are limited data investigating the results after rotational atherectomy (RA) in this setting. The aim of this study was to investigate the in-hospital and 1-year outcomes after RA of heavily calcified ULM lesions. A retrospective cohort analysis was performed on all calcified patients with ULM (n = 86) enrolled in the multicenter international ROTATE registry (overall patients, n = 962)...
February 9, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28271356/geometric-modeling-of-hepatic-arteries-in-3d-ultrasound-with-unsupervised-mra-fusion-during-liver-interventions
#16
Maxime Gérard, François Michaud, Alexandre Bigot, An Tang, Gilles Soulez, Samuel Kadoury
PURPOSE: Modulating the chemotherapy injection rate with regard to blood flow velocities in the tumor-feeding arteries during intra-arterial therapies may help improve liver tumor targeting while decreasing systemic exposure. These velocities can be obtained noninvasively using Doppler ultrasound (US). However, small vessels situated in the liver are difficult to identify and follow in US. We propose a multimodal fusion approach that non-rigidly registers a 3D geometric mesh model of the hepatic arteries obtained from preoperative MR angiography (MRA) acquisitions with intra-operative 3D US imaging...
March 7, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28271001/fully-integrated-optical-coherence-tomography-ultrasound-and-indocyanine-green-based-fluorescence-tri-modality-system-for-intravascular-imaging
#17
Yan Li, Joseph Jing, Yueqiao Qu, Yusi Miao, Buyun Zhang, Teng Ma, Mingyue Yu, Qifa Zhou, Zhongping Chen
We present a tri-modality imaging system and fully integrated tri-modality probe for intravascular imaging. The tri-modality imaging system is able to simultaneously acquire optical coherence tomography (OCT), ultrasound (US), and fluorescence imaging. Moreover, for fluorescence imaging, we used the FDA-approved indocyanine green (ICG) dye as the contrast agent to target lipid-loaded macrophages. We conducted imaging from a male New Zealand white rabbit to evaluate the performance of the tri-modality system...
February 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28270995/real-time-volumetric-lipid-imaging-in-vivo-by-intravascular-photoacoustics-at-20-frames-per-second
#18
Min Wu, Geert Springeling, Matija Lovrak, Frits Mastik, Sophinese Iskander-Rizk, Tianshi Wang, Heleen M M van Beusekom, A F W van der Steen, Gijs Van Soest
Lipid deposition can be assessed with combined intravascular photoacoustic/ultrasound (IVPA/US) imaging. To date, the clinical translation of IVPA/US imaging has been stalled by a low imaging speed and catheter complexity. In this paper, we demonstrate imaging of lipid targets in swine coronary arteries in vivo, at a clinically useful frame rate of 20 s(-1). We confirmed image contrast for atherosclerotic plaque in human samples ex vivo. The system is on a mobile platform and provides real-time data visualization during acquisition...
February 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28269190/automated-in-vivo-delineation-of-lumen-wall-using-intravascular-ultrasound-imaging
#19
Debarghya China, Manas K Nag, K M Mandana, Anup K Sadhu, Pabitra Mitra, Chandan Chakraborty
This paper presents a novel methodology for automated detection and extraction of the lumen wall from Intravascular Ultrasound (IVUS) frames. IVUS is an in-vivo pull back imaging technique and provides a sequential frame of images for diagnosis of atherosclerotic heart disease. The detection and segmentation of lumen wall is necessary for predicting the arterial wall blockage. Lumen wall is recognized and segmented with the help of seed refinement and random walks algorithms, in tunica and lumen area. The proposed methodology was tested on 147 frames of 13 patients...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268869/computational-estimation-of-the-severity-of-coronary-lesions-with-intravascular-ultrasound-images-a-pilot-study
#20
Panagiotis K Siogkas, Michail I Papafaklis, Bill D Gogas, Habib Samady, Lampros K Michalis, Dimitrios I Fotiadis
The fast and accurate hemodynamic functional assessment of the coronary vasculature is of utmost importance in clinical practice due to the fact that Cardiovascular Diseases have become the leading cause of death globally. In this work we propose a novel method that combines two of the most efficient methods of hemodynamic status assessment of coronary arteries, Intravascular UtraSound and virtual Functional Assessment Index, an index that correlates well to the measured Fractional Flow Reserve. One Left Anterior Descending segment was reconstructed both in a straight manner (using only IVUS images) as well as using the actual 3D geometry of the vessel (using IvUS images combined with the respective coronary angiographic images [2])...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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