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Intravascular Imaging

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https://www.readbyqxmd.com/read/30510608/intravascular-large-b-cell-lymphoma-presenting-with-diffusely-increased-pulmonary-fluorodeoxyglucose-uptake-without-corresponding-ct-abnormality
#1
Jayden Spencer, Reginald Dusing, Wendell Yap, Jacqueline Hill, Carissa Walter
A 60-year-old male presented with complaints of dyspnea, intermittent fever, and 40 pounds of weight loss over the previous 9 months and was admitted for acute hypoxemic respiratory failure. Labs demonstrated elevated inflammatory markers, mild anemia, and thrombocytopenia. Fluorodeoxyglucose-positron emission tomography scan demonstrated diffusely increased pulmonary fluorodeoxyglucose uptake without corresponding abnormality on CT images. Excisional lung biopsy demonstrated intravascular large B-cell lymphoma (IV-LBCL)...
February 2019: Radiology case reports
https://www.readbyqxmd.com/read/30509628/a-thermoregulation-model-for-whole-body-cooling-hypothermia
#2
Ana Beatriz C G Silva, Luiz C Wrobel, Fernando L B Ribeiro
This paper presents a thermoregulation model based on the finite element method to perform numerical analyses of brain cooling procedures as a contribution to the investigation on the use of therapeutic hypothermia after ischemia in adults. The use of computational methods can aid clinicians to observe body temperature using different cooling methods without the need of invasive techniques, and can thus be a valuable tool to assist clinical trials simulating different cooling options that can be used for treatment...
December 2018: Journal of Thermal Biology
https://www.readbyqxmd.com/read/30507499/a-mechanical-approach-for-smooth-surface-fitting-to-delineate-vessel-walls-in-optical-coherence-tomography-images
#3
Max L Olender, Lambros S Athanasiou, Jose M de la Torre Hernandez, Eyal Ben-Assa, Farhad Rikhtegar Nezami, Elazer R Edelman
Automated analysis of vascular imaging techniques is limited by the inability to precisely determine arterial borders. Intravascular optical coherence tomography (OCT) offers unprecedented detail of artery wall structure and composition, but does not provide consistent visibility of the outer border of the vessel due to limited penetration depth. Existing interpolation and surface fitting methods prove insufficient to accurately fill the gaps between the irregularly-spaced and sometimes unreliably-identified visible segments of the vessel outer border...
November 29, 2018: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/30506116/retinal-vessel-optical-coherence-tomography-images-for-anemia-screening
#4
Zailiang Chen, Yufang Mo, Pingbo Ouyang, Hailan Shen, Dabao Li, Rongchang Zhao
Anemia is a disease that leads to low oxygen carrying capacity in the blood. Early detection of anemia is critical for the diagnosis and treatment of blood diseases. We find that retinal vessel optical coherence tomography (OCT) images of patients with anemia have abnormal performance because the internal material of the vessel absorbs light. In this study, an automatic anemia screening method based on retinal vessel OCT images is proposed. The method consists of seven steps, namely, denoising, region of interest (ROI) extraction, layer segmentation, vessel segmentation, feature extraction, feature dimensionality reduction, and classification...
December 1, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/30504513/predicting-iliac-vein-compression-with-computed-tomography-angiography-and-venography-correlation-with-intravascular-ultrasound
#5
Nicolas W Shammas, Gail A Shammas, Sue Jones-Miller, Qais Radaideh, Allyson R Winter, Andrew N Shammas, Istvan Z Kovach, Bassel Bou Dargham, Ghassan E Daher, Rayan Jo Rachwan, W John Shammas, Waleed Omar, Aman Manazir, Srikanth Kasula
BACKGROUND: Intravascular ultrasound (IVUS) is considered the gold standard in diagnosing common iliac vein (CIV) compression. The presence of >50% surface area reduction by IVUS is considered significant compression by most operators. Thus, we evaluated the role of computed tomography angiography (CTA) and venography in diagnosing CIV compression when compared to IVUS. METHODS: All patients who underwent CTA of the pelvis with venous filling phase, IVUS, and venography within a few weeks apart to evaluate for symptomatic CIV compression from one cardiovascular practice were retrospectively reviewed...
December 2018: Journal of Invasive Cardiology
https://www.readbyqxmd.com/read/30500656/single-centre-experience-and-preliminary-results-of-intravascular-ultrasound-in-endovascular-aneurysm-repair
#6
Authors Felice Pecoraro, Umberto M Bracale, Arduino Farina, Giovanni Badalamenti, Francesca Ferlito, Mario Lachat, Ettore Dinoto, Vincenzo Asti, Guido Bajardi
AIM: . Intravascular ultrasound (IVUS) has been introduced as diagnostic adjunct to provide new insights in the diagnosis and therapy of vascular disease. Herein we compared the outcomes of conventional endovascular aneurysm repair (EVAR) and EVAR with IVUS in patients presenting infrarenal abdominal aortic aneurysm using a propensity-matched cohort. METHODS: From May 2013 to August 2017, 221 patients were retrospectively analysed. 122 patients were eligible for inclusion and underwent to propensity score matching...
November 27, 2018: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/30497930/stent-deformation-caused-by-entrapment-of-the-side-branch-balloon-catheter-during-the-jailed-balloon-protection-technique-for-a-calcified-coronary-bifurcation-lesion-a-case-report-and-literature-review
#7
REVIEW
Yohei Numasawa, Yasuhiro Hitomi, Shohei Imaeda, Souichi Yokokura, Makoto Tanaka, Ryota Tabei, Masaki Kodaira
Percutaneous coronary intervention (PCI) for true bifurcation lesions is challenging. Although the jailed balloon protection technique is an established method with which to prevent side branch occlusion during the treatment of bifurcation lesions, little is known regarding the potential risks of this technique. We describe a 71-year-old man with exertional angina pectoris who was treated with PCI for a calcified true bifurcation lesion in the left anterior descending artery and diagonal branch. After performing rotational atherectomy (1...
November 22, 2018: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/30489684/intravascular-ultrasound-analysis-of-intraplaque-versus-subintimal-tracking-in-percutaneous-intervention-for-coronary-chronic-total-occlusions-one-year-outcomes
#8
Matthew T Finn, Darshan Doshi, Jacob Cleman, Lei Song, Akiko Maehara, Raja Hatem, Björn Redfors, Sanjog Kalra, Justin A Fried, Ming Liao, Candido Batres, Jeffery W Moses, Manish A Parikh, Michael B Collins, Tamim M Nazif, Khady N Fall, Phillip Green, Ajay J Kirtane, Ziad A Ali, Martin B Leon, Gary S Mintz, Dimitri Karmpaliotis
OBJECTIVES: We sought to determine the 1-year outcomes of patients receiving successful chronic total occlusion (CTO) percutaneous coronary intervention (PCI) procedures comparing subintimal versus intraplaque wire tracking patterns. BACKGROUND: CTO PCI utilizes both intraluminal and subintimal wire tracking to achieve successful percutaneous revascularization. Intravascular ultrasound (IVUS) can be used to precisely determine the path of wire tracking. METHODS: From 2014 to 2016, data from patients undergoing CTO PCI were collected in a single-center database...
November 29, 2018: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/30488332/comparative-quantification-of-arterial-lipid-by-intravascular-photoacoustic-ultrasound-imaging-and-near-infrared-spectroscopy-intravascular-ultrasound
#9
Ayeeshik Kole, Yingchun Cao, Jie Hui, Islam A Bolad, Mouhamad Alloosh, Ji-Xin Cheng, Michael Sturek
Intravascular photoacoustic-ultrasound (IVPA-US) imaging and near-infrared spectroscopy-intravascular ultrasound (NIRS-IVUS) are two hybrid modalities that detect arterial lipid, with comparison necessary to understand the relative advantages of each. We performed in vivo and ex vivo IVPA-US imaging of the iliac arteries of Ossabaw swine with metabolic syndrome (MetS) and lean swine to investigate sensitivity for early-stage atherosclerosis. We repeated imaging ex vivo with NIRS-IVUS for comparison to IVPA-US and histology...
November 28, 2018: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/30478814/radiation-dose-and-image-quality-with-new-protocol-in-lower-extremity-computed-tomography-angiography
#10
Nicolò Schicchi, Marco Fogante, Matteo Oliva, Paolo Esposto Pirani, Giacomo Agliata, Gian Marco Giuseppetti, Andrea Giovagnoni
PURPOSE: To compare radiation dose and image quality of lower extremity computed tomography angiography (CTA) between cranio-caudal acquisition with single-source CT (SSCT) and flash caudo-cranial acquisition with dual-source CT (DSCT). MATERIALS AND METHODS: In this prospective study, 60 patients were randomly assigned to Group A (control) or Group B (experimental) to undergo lower extremity CTA for peripheral obliterative arterial disease. Group A received protocol 1 (P1) with SSCT cranio-caudal acquisition...
November 27, 2018: La Radiologia Medica
https://www.readbyqxmd.com/read/30476460/virtual-monochromatic-dual-energy-aortoiliac-ct-angiography-with-reduced-iodine-dose-a-prospective-randomized-study
#11
Manuel Patino, Anushri Parakh, Grace C Lo, Mukta Agrawal, Avinash R Kambadakone, George R Oliveira, Dushyant V Sahani
OBJECTIVE: The purpose of this study was to assess the feasibility of performing abdominopelvic aortoiliac CT angiography (CTA) with 16.0 g of iodine contrast medium acquired with low-energy (40 and 50 keV) virtual monochromatic (VMC) images with rapid-kilovoltage-switching dual-energy CT. SUBJECTS AND METHODS: A total of 52 adults with abdominal aortoiliac aneurysm and prior 120-kVp single-energy CTA (SECTA) with 33 g iodine (standard dose) underwent follow-up dual-energy CTA (DECTA) with a 52% reduced iodine dose...
November 26, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/30469448/a-40-mhz-ultrasound-transducer-with-an-angled-aperture-for-guiding-percutaneous-revascularization-of-chronic-total-occlusion-a-feasibility-study
#12
Junsu Lee, Jin Ho Chang
Complete blockage of a coronary artery, called chronic total occlusion (CTO), frequently occurs due to atherosclerosis. To reopen the obstructed blood vessels with a stent, guidewire crossing is performed with the help of angiography that can provide the location of CTO lesions and the image of guidewire tip. Since angiography is incapable of imaging inside a CTO lesion, the surgeons are blind during guidewire crossing. For this reason, the success rate of guidewire crossing relies upon the proficiency of the surgeon, which is considerably reduced from 69...
November 21, 2018: Sensors
https://www.readbyqxmd.com/read/30467978/do-pre-haemodialysis-estimates-of-extracellular-volume-excess-using-bioimpedance-and-n-terminal-brain-natriuretic-peptide-correlate-with-cardiac-chamber-size-measured-by-magnetic-resonance-imaging
#13
Suree Yoowannakul, Tushar Kotecha, Marianna Fontana, Andrew Davenport
BACKGROUND: Bioimpedance can be used to measure extracellular water (ECW) and total body water (TBW) in haemodialysis (HD) patients and estimate ECW excess. However, ECW excess potentially includes both an increase in the plasma volume and also the extravascular volume. Overestimating the amount of fluid to be removed during HD risks intra-dialytic hypotension. We wished to determine the association between estimates of ECW excess comparing several different equations using bioimpedance, brain N-terminal pro-brain natriuretic peptide (NT-proBNP) with cardiac chamber volumes and function as determined by cardiac magnetic resonance imaging (MRI) METHODS: Pre-HD measurements of ECW and TBW were made using multi-frequency bioimpedance and cardiac chamber sizes and functionwere determined by MRI ...
November 23, 2018: Therapeutic Apheresis and Dialysis
https://www.readbyqxmd.com/read/30467194/assessment-of-reversibility-in-pulmonary-arterial-hypertension-and-congenital-heart-disease
#14
REVIEW
Diederik E van der Feen, Beatrijs Bartelds, Rudolf A de Boer, Rolf M F Berger
Pulmonary arterial hypertension (PAH) in congenital heart disease (CHD) can be reversed by early shunt closure, but this potential is lost beyond a certain point of no return. Therefore, it is crucial to accurately assess the reversibility of this progressive pulmonary arteriopathy in an early stage. Reversibility assessment is currently based on a combination of clinical symptoms and haemodynamic variables such as pulmonary vascular resistance. These measures, however, are of limited predictive value and leave many patients in the grey zone...
November 22, 2018: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/30459699/optical-coherence-tomography-of-spontaneous-basilar-artery-dissection-in-a-patient-with-acute-ischemic-stroke
#15
Peng Gao, Liqiang Gui, Bin Yang, Timo Krings, Liqun Jiao
The diagnosis of intracranial arterial dissection (IAD) may be challenging and multimodal imaging techniques are often needed to confirm the diagnosis. Previous studies have based their criteria for diagnosis of IAD on conventional angiography, computed tomography, or magnetic resonance imaging. We report a case with acute ischemic stroke due to spontaneous basilar artery dissection in which intravascular optical coherence tomography (OCT) was used to show features of IAD. A 59-years-old woman presented with symptoms of acute ischemic stroke...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/30456630/-esc-eacts-guidelines-on-myocardial-revascularization-2018-the-most-important-innovations
#16
REVIEW
F-J Neumann, W Hochholzer, M Siepe
The guidelines on myocardial revascularization published in 2018 are a joint initiative of the European Society of Cardiology and the European Association for Cardio-Thoracic Surgery. To establish indications for myocardial revascularization by percutaneous coronary intervention (PCI) or coronary artery bypass grafting (CABG), evidence of the functional relevance of coronary artery stenoses is needed either by non-invasive imaging function tests or intravascular hemodynamic measurements. The prognostic and symptomatic benefits of myocardial revascularization depend on whether complete revascularization can be achieved...
November 19, 2018: Herz
https://www.readbyqxmd.com/read/30455866/a-prospective-case-series-evaluating-use-of-an-in-line-air-detection-and-purging-system-to-reduce-air-burden-during-major-surgery
#17
Yussr M Ibrahim, Nicole R Marques, Carlos R Garcia, Michael Salter, Christopher McQuitty, Michael Kinsky, Mindy Juan, Achiau Ludomirsky
Background: Intravascular air embolism (AE) is a preventable but potentially catastrophic complication caused by intravenous tubing, trauma, and diagnostic and surgical procedures. The potentially fatal risks of arterial AE are well-known, and emerging evidence demonstrates impact of venous AEs on inflammatory response and coagulation factors. A novel FDA-approved in-line air detection and purging system was used to detect and remove air caused by administering a rapid fluid bolus during surgery...
2018: Perioperative Medicine
https://www.readbyqxmd.com/read/30442605/an-fpga-based-backend-system-for-intravascular-photoacoustic-and-ultrasound-imaging
#18
Xun Wu, Jean L Sanders, Xiao Zhang, F Yalcin Yamaner, Omer Oralkan
The integration of intravascular ultrasound (IVUS) and intravascular photoacoustic (IVPA) imaging produces an imaging modality with high sensitivity and specificity which is particularly needed in interventional cardiology. Conventional side-looking IVUS imaging with a single-element ultrasound (US) transducer lacks forward-viewing capability, which limits the application of this imaging mode in intravascular intervention guidance, Doppler-based flow measurement, and visualization of nearly or totally blocked arteries...
November 14, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30440536/comparison-of-3d-reconstruction-methods-based-on-different-cardiovascular-imaging-a-study-of-multimodality-reconstruction-method
#19
Panagiota I Tsompou, Antonis I Sakellarios, Panagiotis K Siogkas, Ioannis O Andrikos, Vassiliki I Kigka, Pedro A Lemos, Lampros K Michalis, Dimitrios I Fotiadis
Coronary arterial imaging and the assessment of the severity of arterial stenoses can be achieved with several modalities classified mainly according to their invasive or noninvasive nature. These modalities can be further utilized for the 3-dimensional (3D) reconstruction of the arterial geometry. This study aims to determine the prediction performance of atherosclerotic disease progression using reconstructed arteries from three reconstruction methodologies: Quantitative Coronary Analysis (QCA), Virtual Histology Intravascular Ultrasound (VH)-IVUS-Angiography fusion method and Coronary Computed Tomography Angiography (CCTA)...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/30439514/characterizing-contrast-origins-and-noise-contribution-in-spin-echo-epi-bold-at-3-t
#20
Don M Ragot, J Jean Chen
In this work, we characterize contrast origins and noise contributions of spin echo (SE) EPI BOLD signal at 3 T. SE BOLD is a fMRI method of choice for imaging brain regions affected by susceptibility artifacts at lower fields, but its sensitivity remains a limiting factor for whole-brain imaging. To resolve this, the signal and noise contributions as well as TE dependence of SE EPI are characterized in this study. By integrating a two-compartment BOLD model with a physiological-thermal noise model, a new SE-BOLD signal model was introduced...
November 12, 2018: Magnetic Resonance Imaging
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