1. Articles from jvir.org

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    1. Optical Coherence Tomography of Dialysis Graft after Angioplasty

      Optical Coherence Tomography of Dialysis Graft after Angioplasty

      Neointimal hyperplasia, the major cause of arteriovenous graft (AVG) stenosis, is not directly visualized by angiography. A 60-year-old woman on hemodialysis presented with a clotted AVG 30 days after its creation. Following percutaneous thrombectomy, angiography revealed severe (> 50%) stenosis at the graft (G)-vein (V) anastomosis (arrow in Fig 1 ). Optical coherence tomography performed using an intravascular Dragonfly catheter (St. Jude Medical, Westford, Massachusetts) delineated the intima in bright yellow.

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    2. Prospective Evaluation of Optical Coherence Tomography in Lower Limb Arteries Compared with Intravascular Ultrasound

      Prospective Evaluation of Optical Coherence Tomography in Lower Limb Arteries Compared with Intravascular Ultrasound

      Purpose To compare in a prospective noninferiority study optical coherence tomography (OCT) and intravascular ultrasound (IVUS) in popliteal and infrapopliteal vessels. Materials and Methods OCT and IVUS images of 112 popliteal and infrapopliteal arterial segments were prospectively obtained from 16 patients with peripheral arterial occlusive disease. Three observers evaluated the corresponding OCT and IVUS images for image quality, artifact frequency, discriminability of vessel wall layers, and plaque composition. Measurements of the lumen, vessel, and plaque areas were compared for both modalities. Results The intrareader and interreader reproducibility of plaque tissue discrimination (0.88 vs 0.75), overall image quality, and ...

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    3. Optical coherence tomography in interventional radiology

      Optical coherence tomography in interventional radiology

      Learning Objectives Understand the theory and mechanisms of optical coherence tomography (OCT) 2. Explain the benefits of OCT compared with other imaging modalities 3. Describe how OCT is performed, emphasizing intravascular techniques Background OCT, a type of optical tomography (OT), has emerging applications in interventional radiology. In OT, light transmitted through objects is measured for volumetric imaging models. In OCT, near-infrared light is used, allowing deeper tissue penetration. OCT has been referred to as “optical ultrasound,” whereby reflections of light from within tissues are imaged, yielding cross-sectional data. OCT images subsurface tissue morphology at near-microscopic resolution higher than US or ...

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