Objectives : The primary objective of this study was to quantitatively analyze ex vivo porcine, fetal human, and adult human vocal folds by use of optical coherence tomography (OCT). A secondary objective was to quantitatively discriminate among 1-, 2-, and 3-layer lamina propria structures. Methods : We performed an analysis of the vocal folds of 10 adult pig, 3 adult human, and 2 fetal human vocal fold specimens using OCT and histologic techniques. We present a quantitative comparison of the OCT results and histologic findings. Results : We found that OCT allowed for the visualization of the subepithelial vocal fold architecture of all ...
Since its introduction, optical coherence tomography (OCT) has become widely used and accepted as an imaging modality to detect and follow glaucoma, with measurement of the peripapillary retinal nerve fiber layer (pRNFL) being the most utilized parameter. Up until recently, macular thickness parameters have not been commonly used in glaucoma due to results of earlier studies with time-domain OCT (TD-OCT) that revealed macular imaging to be inferior to pRNFL in the diagnosis of glaucoma. The recent advent of spectral-domain OCT (SD-OCT) has renewed interest in the potential uses of macular imaging in glaucoma due to its ability to better segment ...
Optical coherence tomography (OCT) has been routinely used to obtain high spatial resolution images of the retina and choroid non-invasively. Within the past decade, a fourth-generation OCT device using Fourier domain (FD) analysis has been developed that provides higher velocity and higher axial resolution images with better reproducibility than the previous generation time domain (TD) OCT technology. This review addresses the use of fourth-generation, FD ocular OCT in patients with multiple sclerosis.
Imaging of the choroidal layer has been limited with the conventional commercial SD-OCTs. Enhanced depth imaging optical coherence tomography (EDI-OCT) is a modification of the standard spectral-domain OCT (SD-OCT) technique that enables better non-invasive imaging of the choroid. This review contains an introduction of EDI imaging technique and principles and summarizes the findings of EDI-OCT imaging in age-related macular degeneration.
The advent of optical coherence tomography (OCT) technology has greatly enhanced our understanding of vitreoretinal diseases; it has become a routine diagnostic imaging method for the evaluation of vitreoretinal abnormalities and injuries in adult and pediatric patients. The use of OCT has recently been extended beyond the offices and clinics to perioperative and intraoperative settings. The new development in high-resolution and high-speed spectral domain OCT, along with the improvement in portability, has made the device more valuable than ever before. Our article summarizes the current development of the portable OCT devices in clinical, perioperative, and intraoperative settings in the management ...
Uveitis is a potentially visually threatening disease accounting for 10% of vision loss in the developed world. 1 The most common cause of vision loss in patients with uveitis has been shown to be macular edema (ME). 1 The early detection and management of ME is critical to preserve vision in these patients. Optical coherence tomography (OCT) is a valuable tool in the management of many ocular diseases. The use of OCT has revolutionized the diagnosis and management of macular edema from a wide variety of ophthalmological diseases, including uveitis. 2 In this review, we evaluate the role of OCT ...
Anterior segment optical coherence tomography (AS-OCT) has recently emerged as an important modality for imaging of the cornea. Since its introduction less than a decade ago, it has been clinically used for the diagnosis and management of an expanding number of corneal conditions. In this review, we will discuss the applications of anterior segment optical coherence tomography after corneal surgery, focusing on penetrating and lamellar keratoplasty, keratoprosthesis, intracorneal ring segments, collagen cross-linking and refractive surgery. Anterior segment optical coherence tomography is useful in evaluating outcomes, detecting adverse events, determining prognosis, guiding management decisions, and surgical planning.
Ocular imaging technologies continue to evolve and play increasingly important roles in both the diagnosis and management of corneal pathology. In addition to improved documentation of exam findings using increasingly better resolution photographs, newer modalities, including specular and confocal microscopy, can facilitate diagnosis by imaging single cell layers within the cornea. Anterior segment optical coherence tomography (OCT) and ultrasound biomicroscopy (UBM) can image structures in the cornea and anterior segment which may not otherwise be visible. This is particularly useful in patients with opaque corneas. The ability to topographically map the cornea allows for more accurate pre- and post-operative planning ...
Optical coherence tomography (OCT) is a non-invasive, high-resolution and high-speed imaging modality that has enjoyed rapid growth in ophthalmology since its development 20 years ago. Contact lens fitting is traditionally based on trial lenses, which is expensive and time-consuming. Modern anterior segment OCT is capable of generating three-dimensional ocular surface maps of the cornea and sclera with potential application in contact lens fitting. This paper reviewed the history, the ophthalmic applications, and the most recent advancement in three-dimensional anterior segment OCT. There is very limited literature of OCT in contact lens fitting to date. This review anticipates an increase in ...
Anterior segment imaging modalities including anterior segment optical coherence tomography (AS-OCT) and ultrasound biomicroscopy (UBM) are increasingly widespread, and can quantify several parameters of the anterior segment, such as anterior chamber depth and angle anatomy. These parameters are important to assess, particularly in patients with forms of narrow angle glaucoma. In many cases of open and narrow angle glaucoma, cataract extraction has been shown to result in favorable modification of these parameters, and a lasting decrease in intraocular pressure. Anterior segment imaging has the ability to enable the development of predictive models regarding the potential intraocular pressure lowering effect of ...
Keck School of Medicine of USC Dean Carmen A. Puliafito received the 2012 António Champalimaud Vision Award today for the invention and development of optical coherence tomography (OCT) — imaging technology that has revolutionized the practice of ophthalmology by dramatically improving the ability of clinicians to diagnose and treat such blinding diseases as macular degeneration, diabetic retinopathy and glaucoma. Puliafito accepted the award in Lisbon, Portugal, during a ceremony held at the Champalimaud Foundation, one of the world’s largest international scientific institutions. “The António Champalimaud Vision Award is a magnificent testament to Dr. Puliafito’s pioneering achievements in ...
The tympanic membrane is one of the major structures of the ear that aids in the hearing process, giving humans one of the five major senses. It is hypothesized that sound induced displacements of the membrane, which allow humans to hear, are directly related to the membrane’s medial layer which is comprised of a network of collagen fibers. Limitations in available medical imaging techniques have thus far inhibited the further study of these fibers. In this paper we detail an imaging system that we developed with the capability to quantitatively and noninvasively image the internal structures of biological tissues ...
Massachusetts Eye and Ear Infirmary is a specialty hospital providing outstanding patient care for disorders of the eye, ear, nose, throat, head and neck. Founded in 1824, MEEI is an international leader in Ophthalmology and Otolaryngology research and a teaching partner of Harvard Medical School.