1. Karen T. Witberg

    0 Comments Leave a Comment

    1-16 of 16
    1. Mentioned In 16 Articles

    2. The Effect of Stent Artefact on Quantification of Plaque Features Using Optical Coherence Tomography (OCT): A Feasibility and Clinical Utility Study

      The Effect of Stent Artefact on Quantification of Plaque Features Using Optical Coherence Tomography (OCT): A Feasibility and Clinical Utility Study
      Background Optical coherence tomography (OCT) can detect detailed plaque features in native coronary arteries. Stent struts cause shadows that partially obscure the vessel wall, but plaque features can still be seen. We investigated the impact of stent artefact on plaque quantification and whether the plaque behind struts is associated with microvascular dysfunction. Methods Patients retrospectively recruited from two centres, underwent OCT pre- and post-stenting on the same vessel segment. Lipid ...
      Read Full Article
    3. EuroIntervention Automated characterisation of lipid core plaques in vivo by quantitative optical coherence tomography tissue type imaging

      EuroIntervention Automated characterisation of lipid core plaques in vivo by quantitative optical coherence tomography tissue type imaging
      Aims: Qualitative criteria for plaque tissue characterisation by OCT are well established, but quantitative methods lack systematic validation in vivo . High optical attenuation coefficient t has been associated with unstable plaque features, such as lipid core. The purpose of this study was to validate optical coherence tomography (OCT) attenuation imaging for tissue characterisation in vivo , specifically to detect lipid core in coronary atherosclerotic plaques, and to evaluate quantitatively the ability ...
      Read Full Article
    4. Safety of optical coherence tomography in daily practice: a comparison with intravascular ultrasound

      Safety of optical coherence tomography in daily practice: a comparison with intravascular ultrasound
      Aims Previous studies have reported the safety and feasibility of both time-domain optical coherence tomography (TD-OCT) and Fourier-domain OCT (FD-OCT) in highly selected patients and clinical settings. However, the generalizability of these data is limited, and data in unselected patient populations reflecting a routine cathlab practice are lacking. We compared safety of intracoronary FD-OCT imaging to intravascular ultrasound (IVUS) imaging in a large real-world series of consecutive patients who underwent ...
      Read Full Article
    5. A novel method to assess coronary artery bifurcations by OCT: cut-plane analysis for side-branch ostial assessment from a main-vessel pullback

      A novel method to assess coronary artery bifurcations by OCT: cut-plane analysis for side-branch ostial assessment from a main-vessel pullback
      Aims In coronary bifurcations assessment, evaluation of side-branch (SB) ostia by an optical coherence tomography (OCT) pullback performed in the main branch (MB) could speed up lesion evaluation and minimize contrast volume. Dedicated software that reconstructs the cross-sections perpendicular to the SB centreline could improve this assessment. We aimed to validate a new method for assessing the SB ostium from an OCT pullback performed in the MB. Methods and results ...
      Read Full Article
    6. The impact of Fourier-Domain optical coherence tomography catheter induced motion artefacts on quantitative measurements of a PLLA-based bioresorbable scaffold

      The impact of Fourier-Domain optical coherence tomography catheter induced motion artefacts on quantitative measurements of a PLLA-based bioresorbable scaffold
      Intracoronary Fourier-Domain optical coherence tomography (FD-OCT) enables imaging of the coronary artery within 2-4 seconds, a so far unparalleled speed. Despite such fast data acquisition, cardiac and respiratory motion can cause artefacts due to longitudinal displacement of the catheter within the artery. We studied the influence of longitudinal FD-OCT catheter displacement on serial global lumen and scaffold area measurements in coronary arteries of swine that received PLLA-based bioresorbable scaffolds. In ...
      Read Full Article
    7. Three-dimensional optical coherence tomography for guidance of complex percutaneous coronary interventions

      Three-dimensional optical coherence tomography for guidance of complex percutaneous coronary interventions
      Angiographic, Optical Coherence Tomography (OCT) and 3-Dimensional OCT Appearance of the Treated Vessel Pre- (upper panel) and post- (lower panel) intervention (mid panel). Although the angiographic images remained substantially unchanged there was a remarkable improvement (normalization) of the fractional flow reserve measurements after optimization of the stents geometry.
      Read Full Article
    8. Optical coherence tomography for evaluation of coronary stents in vivo

      Optical coherence tomography for evaluation of coronary stents in vivo
      Coronary optical coherence tomography (OCT) is a light-based imaging modality that emits light in the near-infrared range. Compared with intravascular ultrasound, OCT has an extraordinarily high resolution (nearly tenfold higher), with an axial resolution in the range of 1215 m and a lateral resolution of 2040 m. The main drawback of OCT is its relatively low penetration power, especially into lipid-rich atherosclerotic tissue. Second-generation OCT systems, known as frequency domain ...
      Read Full Article
    9. Association of neointimal morphology by optical coherence tomography with rupture of neoatherosclerotic plaque very late after coronary stent implantation.

      Association of neointimal morphology by optical coherence tomography with rupture of neoatherosclerotic plaque very late after coronary stent implantation.
      ...neoatherosclerotic plaque very late after coronary stent implantation. Antonios Karanasos ; Jurgen Ligthart ; Karen Witberg ; Konstantinos Toutouzas ; Joost Daemen ; Gijs van Soest ; Muthukaruppan Gnanadesigan ; Robert-J...
      Read Full Article
    10. In-stent neoatherosclerosis: are first generation drug eluting stents different than bare metal stents? an optical coherence tomography study

      In-stent neoatherosclerosis: are first generation drug eluting stents different than bare metal stents? an optical coherence tomography study
      ...g eluting stents different than bare metal stents? an optical coherence tomography study Antonios Karanasos ; Karen Witberg ; Jurgen Ligthart ; Konstantinos Toutouzas ; Joost Daemen ; Gijs van Soest ; Muthukaruppan Gnana...
      Read Full Article
    11. Feature Of The Week 11/11/12: Characterization of Coronary Bifurcations using Optical Coherence Tomography

      Feature Of The Week 11/11/12: Characterization of Coronary Bifurcations using Optical Coherence Tomography
      Correct characterization of coronary bifurcations by optical coherence tomography (OCT) is critical in the evaluation of lesions, dedicated bifurcation stents and stent techniques. Assessment is limited by the need for acquiring images in both the main branch (MB) and the dissection prone side branch (SB). Analysis poses the significant risk of OCT cross sections not being perpendicular to the true vessel centerline due to imaging wires being non-parallel to the ...
      Read Full Article
    12. In vivo comparison of arterial lumen dimensions assessed by co-registered three-dimensional (3D) quantitative coronary angiography, intravascular ultrasound and optical coherence tomography

      In vivo comparison of arterial lumen dimensions assessed by co-registered three-dimensional (3D) quantitative coronary angiography, intravascular ultrasound and optical coherence tomography
      This study sought to compare lumen dimensions as assessed by 3D quantitative coronary angiography (QCA) and by intravascular ultrasound (IVUS) or optical coherence tomography (OCT), and to assess the association of the discrepancy with vessel curvature. Coronary lumen dimensions often show discrepancies when assessed by X-ray angiography and by IVUS or OCT. One source of error concerns a possible mismatch in the selection of corresponding regions for the comparison. Therefore ...
      Read Full Article
    13. Five-Year Optical Coherence Tomography Follow-Up of an Everolimus-Eluting Bioresorbable Vascular Scaffold: Changing the Paradigm of Coronary Stenting?

      Five-Year Optical Coherence Tomography Follow-Up of an Everolimus-Eluting Bioresorbable Vascular Scaffold: Changing the Paradigm of Coronary Stenting?
      ...ing? 1. Antonios Karanasos, MD; 2. Cihan Simsek, MD; 3. Patrick Serruys, MD, PhD; 4. Jurgen Ligthart, BSc; 5. Karen Witberg, CCRN; 6. Robert-Jan van Geuns, MD, PhD; 7. George Sianos, MD, PhD; 8. Felix Zijlstra, MD, PhD; ...
      Read Full Article
    14. NIRS and IVUS for Characterization of Atherosclerosis in Patients Undergoing Coronary Angiography

      NIRS and IVUS for Characterization of Atherosclerosis in Patients Undergoing Coronary Angiography
      ...dagger} , Patrick W. Serruys, MD, PhD^^,, Sanneke de Boer, MD^, Jurgen Ligthart, BSc^, Josep Gomez-Lara, MD^, Karen Witberg, RN^, Roberto Diletti, MD^, Joanna Wykrzykowska, MD^^,||, Robert-Jan van Geuns, MD, PhD^, Carl S...
      Read Full Article
    15. 1-16 of 16
  1. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology
    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents
    3. Technology:

      Broadband Sources, Probes, Tunable Sources
    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks
  2. About Karen T. Witberg

    Karen Witberg is from the Department of Interventional Cardiology, Thoraxcentre, Erasmus University Medical Centre, Rotterdam, The Netherlands.