1. Articles from Kiyofumi Yamada

    1-6 of 6
    1. Application of optical frequency domain imaging to recanalized unruptured internal carotid artery aneurysm treated by flow-diverting stent-assisted coiling

      Application of optical frequency domain imaging to recanalized unruptured internal carotid artery aneurysm treated by flow-diverting stent-assisted coiling

      Here we report the application of optical frequency domain imaging (OFDI), a new optical coherence tomography (OCT) device, for intravascular visualization in the treatment of a recanalized unruptured internal carotid artery aneurysm that was treated initially by stent-assisted coil embolization. OFDI revealed malapposition of the stent and lack of neointimal growth at the aneurysm neck, which was treated by deployment of a Pipeline Embolization Device to overlap the stent. An angiogram performed one year after the procedure revealed perfect healing of the aneurysm and OFDI clearly demonstrated good stent apposition and total endothelialization over the aneurysm neck.

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    2. Optical Coherence Tomography/Optical Frequency Domain Imaging: Imaging Application for Assessment of Human Carotid Plaque

      Optical Coherence Tomography/Optical Frequency Domain Imaging: Imaging Application for Assessment of Human Carotid Plaque

      Optical coherence tomography (OCT) is an intravascular imaging tool. Its high resolution facilitates detailed examination of intravascular morphological characteristics. In the coronary field, OCT systems are applied as practical clinical diagnostic method. In the carotid artery field, OCT is not covered by health insurance, and it is used as a research tool. We have published many reports on the morphological characteristics of carotid artery lesions on OCT or its application for carotid artery stenting. In this article, we review the application of OCT for carotid artery plaque and its usefulness.

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    3. Potential of new generation double-layer micromesh stent for carotid artery stenting in patients with unstable plaque ∼ A preliminary result using OFDI analysis ∼

      Potential of new generation double-layer micromesh stent for carotid artery stenting in patients with unstable plaque ∼ A preliminary result using OFDI analysis ∼

      Background One of the disadvantages of carotid artery stenting (CAS) is high incidence of distal embolism (DE) during or after the procedure. It has been reported that unstable plaque cases are at high risk of DE and plaque protrusion (PP) after stent placement which will become a cause of post procedural ischemic complications. Objective The purpose of this study was to compare the rate and size of PP between CASPER stent which is a new generation double-layer micromesh stent and conventional stents detected by optical frequency domain imaging (OFDI) and to evaluate the efficacy of CAS with CASPER stent for ...

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    4. Tissue Characterization of Carotid Plaques

      Tissue Characterization of Carotid Plaques

      Carotid plaque vulnerability has been reported to be associated with stroke and other cerebrovascular events [ 1 , 2 ]. Therefore, tissue characterization of carotid plaques is important to evaluate the risk of cerebrovascular disease and outcome of treatment for carotid arterial stenosis. Stabilization of vulnerable plaques rather than regression of plaque volume is considered the major contributor to beneficial effects on cerebrovascular events [ 3 ]. With respect to the ultrasound technique, ultrasonic tissue characterization of the myocardium with an integrated backscatter (IBS) analysis was developed, which is capable of providing both conventional two-dimensional echographic (2DE) images and IBS images. In studies of the ...

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    5. Carotid Artery OCT in Cerebral Infarction

      Carotid Artery OCT in Cerebral Infarction

      In a recent issue of iJACC , Prati et al. 1 suggested that plaque characterization by newer imaging modalities such as intracoronary optical coherence tomography (OCT) may help optimize management strategies in acute coronary events. Although OCT imaging has been extensively performed for the characterization of culprit plaques in acute coronary events ( 2 ), the intravascular imaging data defining plaque composition in the acute cerebral events is rather sparse 3 . We present anecdotal examples of internal carotid artery (ICA) OCT images of plaque morphology in the patients afflicted by acute cerebral infarction. An 83-year-old man presented with sudden hemiplegia while praying in ...

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    OCT of Human Carotid Arterial Plaques Carotid Artery OCT in Cerebral Infarction Tissue Characterization of Carotid Plaques Potential of new generation double-layer micromesh stent for carotid artery stenting in patients with unstable plaque ∼ A preliminary result using OFDI analysis ∼ Optical Coherence Tomography/Optical Frequency Domain Imaging: Imaging Application for Assessment of Human Carotid Plaque Application of optical frequency domain imaging to recanalized unruptured internal carotid artery aneurysm treated by flow-diverting stent-assisted coiling Enhanced Intrinsic Skin Aging in Nephropathic Cystinosis Assessed by High-Definition Optical Coherence Tomography Deep learning toolbox for automated enhancement, segmentation, and graphing of cortical optical coherence tomography microangiograms Optical Coherence Tomography of Cranial Dura Mater: Microstructural Visualization in Vivo Widefield Optical Coherence Tomography Angiography in Diabetic Retinopathy OCT Assistance in Identifying Retinal Breaks in Symptomatic Posterior Vitreous Detachments Optical comparison between micro-CT and OCT in imaging of marginal composite adaptation; Observational study