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Microvascular imaging

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https://www.readbyqxmd.com/read/29224927/central-visual-field-damage-and-parapapillary-choroidal-microvasculature-dropout-in-primary-open-angle-glaucoma
#1
Eun Ji Lee, Tae-Woo Kim, Ji-Ah Kim, Jeong-Ah Kim
PURPOSE: To determine whether microvasculature dropout (MvD) in the parapapillary choroid is related to the presence of central visual field defects in primary open-angle glaucoma (POAG). DESIGN: Cross-sectional observational study. PARTICIPANTS: Thirty-two POAG patients with an initial parafoveal scotoma (IPFS) within a 10° radius in 1 hemifield and 42 POAG patients with an initial nasal step (INS) within the nasal periphery outside 10° of fixation in 1 hemifield...
December 7, 2017: Ophthalmology
https://www.readbyqxmd.com/read/29218284/how-much-can-we-do-by-reverse-superficial-sural-artery-flap-to-potentiate-its-effects-introducing-spout-sural-flap-as-a-new-modification
#2
Jalaluddin Khoshnevis, Terifeh Dashti, Eznollah Azargashb, Mohamad Reza Kalantar Motamedi
BACKGROUND: Due to shortage of local donor tissue and unreliable blood supply, free flaps were the mainstay of treatment for tissue defects in the lower leg and foot region, but it requires a qualified microvascular surgeon. Recently, attention has been paid to reverse superficial sural artery flap (RSSAF) and its modifications as a good alternative to pave the way to simple and friendly techniques. METHODS: Excluding each patient with septic and severely ischemic foot, every patient with tissue defect in distal leg and proximal foot region were studied...
September 2017: World Journal of Plastic Surgery
https://www.readbyqxmd.com/read/29217741/on-the-reproducibility-of-inversion-recovery-intravoxel-incoherent-motion-imaging-in-cerebrovascular-disease
#3
S M Wong, W H Backes, C E Zhang, J Staals, R J van Oostenbrugge, C R L P N Jeukens, J F A Jansen
BACKGROUND AND PURPOSE: Intravoxel incoherent motion imaging can measure both microvascular and parenchymal abnormalities simultaneously. The contamination of CSF signal can be suppressed using inversion recovery preparation. The clinical feasibility of inversion recovery-intravoxel incoherent motion imaging was investigated in patients with cerebrovascular disease by studying its reproducibility. MATERIALS AND METHODS: Sixteen patients with cerebrovascular disease (66 ± 8 years of age) underwent inversion recovery-intravoxel incoherent motion imaging twice...
December 7, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29215761/in-vivo-differentiation-of-common-basal-cell-carcinoma-subtypes-by-microvascular-and-structural-imaging-using-dynamic-optical-coherence-tomography
#4
Lotte Themstrup, Nathalie De Carvalho, Sabrina Mai Nielsen, Jonas Olsen, Silvana Ciardo, Sandra Schuh, Birgit Meinecke-Hansen Nørnberg, Julia Welzel, Martina Ulrich, Giovanni Pellacani, Gregor B E Jemec
BACKGROUND: The subtype of basal cell carcinoma (BCC) influences the choice of treatment. Optical coherence tomography (OCT) is a non-invasive imaging tool and recent development of angiographic version of OCT has extended the application of OCT to image the cutaneous microvasculature (so called dynamic OCT, D-OCT). This study explores D-OCT's ability to differentiate the common BCC subtypes by microvascular and structural imaging. METHODS: 81 patients with 98 BCC lesions, consisting of three subtypes: 27 superficial BCC (sBCC), 55 nodular BCC (nBCC) and 16 infiltrative BCC (iBCC), were D-OCT scanned at three European dermatology centres...
December 7, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/29209950/spect-myocardial-ischemia-in-the-absence-of-obstructive-cad-contribution-of-the-invasive-assessment-of-microvascular-dysfunction
#5
Loïc Djaïleb, Laurent Riou, Nicolas Piliero, Adrien Carabelli, Estelle Vautrin, Alexis Broisat, Julien Leenhardt, Jacques Machecourt, Daniel Fagret, Gerald Vanzetto, Gilles Barone-Rochette, Catherine Ghezzi
Coronary microvascular dysfunction has recently emerged as a major independent prognostic factor and can be invasively assessed by coronary flow reserve (CFR) and the index of microvascular resistance (IMR). The incremental prognostic value of myocardial ischemia from SPECT myocardial perfusion imaging (MPI) over clinical characteristics, cardiac risk factors, and stress test data for the prediction of hard cardiac events (myocardial infarction and cardiac death) has been well demonstrated over the last two decades regardless of the absence or presence of epicardial CAD...
December 5, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/29209117/application-of-superb-microvascular-imaging-in-focal-liver-lesions
#6
Meng-Na He, Ke Lv, Yu-Xin Jiang, Tian-An Jiang
AIM: To explore the ability of superb microvascular imaging (SMI) in differential diagnosis of focal liver lesions (FLLs) and to compare SMI morphology findings to those of color Doppler ultrasound and enhanced imaging. METHODS: Twenty-four patients with 31 FLLs were included in our study, with diagnoses of hemangioma (HE) (n = 17), hepatocellular carcinoma (HCC) (n = 5), metastatic lesions (n = 5), primary hepatic lymphoma (n = 1), focal nodular hyperplasia (FNH) (n = 2), and adenoma (n = 1)...
November 21, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29208679/the-time-trial-effect-of-timing-of-stem-cell-delivery-following-st-elevation-myocardial-infarction-on-the-recovery-of-global-and-regional-left-ventricular-function-final-2-year-analysis
#7
Jay H Traverse, Timothy D Henry, Carl J Pepine, James T Willerson, Atul R Chugh, Phillip C Yang, David Zhao, Stephen G Ellis, John R Forder, Emerson C Perin, Marc S Penn, Antonis K Hatzopoulos, Jeffrey W Chambers, Kenneth Baran, Ganesh Raveendran, Adrian P Gee, Doris A Taylor, Lem Moyé, Ray F Ebert, Robert D Simari
Rationale: The TIME trial was the first cell therapy trial sufficiently powered to determine if timing of cell delivery following ST-elevation myocardial infarction (STEMI) affects recovery of left ventricular (LV) function. Objective: To report the 2-year clinical and cardiac magnetic resonance imaging (cMRI) results and their modification by microvascular obstruction (MVO). Methods and Results: TIME was a randomized, double-blind, placebo-controlled trial comparing 150 million bone marrow mononuclear cells (BMC) vs...
December 5, 2017: Circulation Research
https://www.readbyqxmd.com/read/29207100/retinal-microvasculature-alteration-in-central-serous-chorioretinopathy
#8
Li Yu, Yi Shao, Yong Chai, Lin-Hong Ye, Qi-Chen Yang, Lei Ye, Qing Yuan, Nan Jiang, Jing-Lin Yi
The aim of the present study was to investigate the changes of retinal microvascular network in patients with central serous chorioretinopathy (CSCR). A total of fifteen patients (right eye) with CSCR and 15 normal controls (right eye) were recruited. We used optical coherence tomography angiography to scan 6x6 mm macular retinal blood flow images with the application of a series of customized image segmentation processing program software to obtain microvascular and macrovascular density, and compared the superficial microvascular (SMIR), superficial macrovascular ring (SMAR) and the superficial total microvascular (STMI) density between CSCR patients and control group...
November 21, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29205168/effect-of-static-scatterers-in-laser-speckle-contrast-imaging-an-experimental-study-on-correlation-and-contrast
#9
Pedro Guilherme Vaz, Anne Humeau-Heurtier, Edite Figueiras, Carlos Correia, Joao M R Cardoso
Laser speckle contrast imaging (LSCI) is a non-invasive microvascular blood flow assessment technique with good temporal and spatial resolutions. Most LSCI systems, including commercials devices, can only perform qualitative blood flow evaluation which is a major limitation of this technique. There are several factors that prevent LSCI to be a quantitative technique. Among these factors we can highlight the effect of static scatterers. The goal of this work was to study the influence of different static and dynamic scatterers concentrations on laser speckle correlation and contrast...
December 5, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29203312/microvascular-decompression-for-treatment-of-trigeminal-neuralgia-factors-that-predict-complete-pain-relief-and-study-of-efficacy-and-safety-in-older-patients
#10
Sarun Nunta-Aree, Kasemsak Patiwech, Bunpot Sitthinamsuwan
OBJECTIVE: Microvascular decompression (MVD) is an effective method for directly treating the etiology of trigeminal neuralgia (TGN). This study aims to investigate the factors that predict complete pain relief after MVD for treatment of TGN, and to study efficacy and safety in older patients. METHODS: This study was conducted in patients with TGN that were treated by MVD at Siriraj Hospital during 2004-2015. Cases with secondary TGN were excluded. Data was gathered from medical records, preoperative magnetic resonance imaging (MRI), intraoperative findings, and by telephone in patients lost to follow-up...
December 1, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29203235/sensibility-and-specificity-of-laser-speckle-contrast-imaging-according-to-endo-pat-index-in-type-1-diabetes
#11
Alessandra S de M Matheus, Maria de Fátima Bevilacqua da Matta, Eliete Leão Silva Clemente, Maria de Lourdes Guimarães Rodrigues, Débora Cristina Torres Valença, Marília B Gomes
OBJECTIVES: To find out an normality value for microvascular response (physiological and pharmacological) assessed through laser speckle contrast imaging (LSCI) based on Endo-PAT, which identifies the ones with Endothelial Dysfunction (ED) in patients with Type 1 Diabetes (T1D). METHODS: Patients with T1D, aged ≥12years underwent a clinical-epidemiological questionnaire. Fasting blood samples were obtained (lipid profile, glycemic control and levels of C-reactive protein)...
December 1, 2017: Microvascular Research
https://www.readbyqxmd.com/read/29202467/endothelial-chimerism-and-vascular-sequestration-protect-pancreatic-islet-grafts-from-antibody-mediated-rejection
#12
Chien-Chia Chen, Eric Pouliquen, Alexis Broisat, Francesco Andreata, Maud Racapé, Patrick Bruneval, Laurence Kessler, Mitra Ahmadi, Sandrine Bacot, Carole Saison-Delaplace, Marina Marcaud, Jean-Paul Duong Van Huyen, Alexandre Loupy, Jean Villard, Sandrine Demuylder-Mischler, Thierry Berney, Emmanuel Morelon, Meng-Kun Tsai, Marie-Nathalie Kolopp-Sarda, Alice Koenig, Virginie Mathias, Stéphanie Ducreux, Catherine Ghezzi, Valerie Dubois, Antonino Nicoletti, Thierry Defrance, Olivier Thaunat
Humoral rejection is the most common cause of solid organ transplant failure. Here, we evaluated a cohort of 49 patients who were successfully grafted with allogenic islets and determined that the appearance of donor-specific anti-HLA antibodies (DSAs) did not accelerate the rate of islet graft attrition, suggesting resistance to humoral rejection. Murine DSAs bound to allogeneic targets expressed by islet cells and induced their destruction in vitro; however, passive transfer of the same DSAs did not affect islet graft survival in murine models...
November 20, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29201991/white-matter-signal-abnormalities-in-former-national-football-league-players
#13
Michael L Alosco, Inga K Koerte, Yorghos Tripodis, Megan Mariani, Alicia S Chua, Johnny Jarnagin, Yashar Rahimpour, Christian Puzo, Rose C Healy, Brett Martin, Christine E Chaisson, Robert C Cantu, Rhoda Au, Michael McClean, Ann C McKee, Alexander P Lin, Martha E Shenton, Ronald J Killiany, Robert A Stern
Introduction: Later-life brain alterations in former tackle football players are poorly understood, particularly regarding their relationship with repetitive head impacts (RHIs) and clinical function. We examined white matter signal abnormalities (WMSAs) and their association with RHIs and clinical function in former National Football League (NFL) players. Methods: Eighty-six clinically symptomatic former NFL players and 23 same-age reportedly asymptomatic controls without head trauma exposure underwent magnetic resonance imaging and neuropsychological testing...
2018: Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
https://www.readbyqxmd.com/read/29198139/evaluation-of-the-coronary-flow-by-the-coronary-clearance-time-in-patients-with-cardiac-syndrome-x
#14
Erkan Yildirim, Uygar Cagdas Yuksel, Murat Celik, Baris Bugan, Mutlu Gungor, Yalcin Gokoglan, Mustafa Koklu, Suat Gormel, Salim Yasar, Cem Barcin
Objective The vessels involved in the microcirculation are too small to be visualized by conventional angiography and no tools are currently available that can directly evaluate the coronary microcirculation. This study evaluated the coronary clearance frame count (CCFC) in patients with cardiac syndrome X (CSX). Methods The retrospective study enrolled patients with angina, who had a positive nuclear imaging test and normal coronary angiography; and a control group consisting of patients who underwent an angiogram to exclude coronary artery disease...
January 1, 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/29196702/spatial-statistical-modelling-of-capillary-non-perfusion-in-the-retina
#15
Ian J C MacCormick, Yalin Zheng, Silvester Czanner, Yitian Zhao, Peter J Diggle, Simon P Harding, Gabriela Czanner
Manual grading of lesions in retinal images is relevant to clinical management and clinical trials, but it is time-consuming and expensive. Furthermore, it collects only limited information - such as lesion size or frequency. The spatial distribution of lesions is ignored, even though it may contribute to the overall clinical assessment of disease severity, and correspond to microvascular and physiological topography. Capillary non-perfusion (CNP) lesions are central to the pathogenesis of major causes of vision loss...
December 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29193621/review-of-the-association-between-retinal-microvascular-characteristics-and-eye-disease
#16
REVIEW
Alexander Newman, Nicholas Andrew, Robert Casson
Computerized retinal imaging technologies enable the static and dynamic measurement of a range of retinal microvascular parameters. Large population-based studies have reported associations between these microvascular indices and various ophthalmic diseases including diabetes, age-related macular degeneration, retinal artery embolism, retinal vein occlusion, glaucoma, and non-glaucomatous optic neuropathies. Increasingly sophisticated imaging and analysis techniques have the potential to provide relevant clinical information regarding disease risk and progression; however, further studies are required to verify associations and strengthen the predictive power of these techniques...
November 29, 2017: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/29193492/perfusion-measures-for-symptom-severity-and-differential-outcome-of-revascularization-in-limb-ischemia-preliminary-results-with-arterial-spin-labeling-reactive-hyperemia
#17
Hou-Jen Chen, Trisha L Roy, Graham A Wright
BACKGROUND: Previously, a theoretical model based on microvascular physiology was established to facilitate the interpretation of calf perfusion dynamics recorded by arterial spin labeling (ASL). PURPOSE: To investigate the clinical relevance of novel perfusion indices by comparing them to the symptoms, response to revascularization, and short-term functional outcome in patients with peripheral arterial disease (PAD). STUDY TYPE: Prospective cohort study...
November 28, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29193469/estimating-the-arterial-input-function-from-dynamic-contrast-enhanced-mri-data-with-compensation-for-flow-enhancement-ii-applications-in-spine-diagnostics-and-assessment-of-crohn-s-disease
#18
Jeroen J N van Schie, Cristina Lavini, Lucas J van Vliet, Gem Kramer, Indra Pieters-van den Bos, J T Marcus, Jaap Stoker, Frans M Vos
BACKGROUND: Pharmacokinetic (PK) models can describe microvascular density and integrity. An essential component of PK models is the arterial input function (AIF) representing the time-dependent concentration of contrast agent (CA) in the blood plasma supplied to a tissue. PURPOSE/HYPOTHESIS: To evaluate a novel method for subject-specific AIF estimation that takes inflow effects into account. STUDY TYPE: Retrospective study. SUBJECTS: Thirteen clinical patients referred for spine-related complaints; 21 patients from a study into luminal Crohn's disease with known Crohn's Disease Endoscopic Index of Severity (CDEIS)...
November 28, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29191678/comparison-of-digital-color-fundus-imaging-and-fluorescein-angiographic-findings-for-the-early-detection-of-diabetic-retinopathy-in-young-type-1-diabetic-patients
#19
Z Kapsala, A Anastasakis, D Mamoulakis, I Maniadaki, M Tsilimbaris
PURPOSE: To compare the findings from digital 7-field color fundus (CF) photography and fundus fluorescein angiography (FFA) in young patients with diabetes mellitus (DM) type 1 without known diabetic retinopathy. METHODS: In this prospective, observational cohort study, 54 type 1 diabetic patients were recruited. Participants had been diagnosed with diabetes mellitus (DM) for at least 6 years, had Best Corrected Visual Acuity of 20/25 or better and did not have any known retinal pathology...
November 27, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/29190246/optical-coherence-tomography-angiography-findings-of-deep-capillary-plexus-microischemia-after-intravenous-chemotherapy-for-retinoblastoma
#20
Kareem Sioufi, Emil A T Say, Sandor C Ferenczy, Ann M Leahey, Carol L Shields
PURPOSE: To study changes in the foveal microvascular anatomy using optical coherence tomography angiography (OCTA) after intravenous chemotherapy (IVC) for retinoblastoma (RB). METHODS: A retrospective comparative case-control series included 10 age-matched normal eyes with no documented ocular pathology (control), 10 fellow eyes of patients with unilateral RB treated with IVC (RB fellow), and 10 eyes with extramacular RB in patients with bilateral RB treated with IVC (RB tumor)...
November 22, 2017: Retina
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