KEYWORDS: Optical coherence tomography, Laser dentistry, Stereoscopy, In vivo imaging, Biomedical applications, Visualization, Tissues, Ranging, Point spread functions, Laser frequency
A framework presented in this study demonstrates an advanced high-speed and long-range wide-field swept-source OCT/OCTA system for imaging the oral cavity. By employing a k-clock calibration strategy, the system's point spread function performance is significantly improved. The achieved wide FOV of 42×42 mm² for OCT and OCTA imaging demonstrates a feasibility for imaging of oral cavity morphology and vascular distribution in a clinical setting. This advanced system provides promising potential for efficient and comprehensive in vivo oral cavity imaging, further expanding OCT's clinical applications in dentistry.
Accurate and repeatable epidermal thickness (ET) measurement is essential for assessing and quantifying cutaneous characteristics in dermatological disease, skin injury, and cosmetic research. Here, we investigated the integration of pressure sensors with optical coherence tomography (OCT) for improved epidermal thickness (ET) measurements. Traditional contact imaging techniques could induce variations in measurement due to inconsistent pressure. By using pressure sensors, real-time monitoring of applied pressure during OCT imaging provides stable and consistent ET mapping, improving repeatability. The result further demonstrates that increased compression forces can lead to significant deformation of the epidermis. This study demonstrates a pressure sensor integration to allow more accurate ET measurements and offers improved imaging quality, with potential applications in dermatology and cosmetics, underscoring the need for controlled pressure in contact imaging.
A framework presented in this study demonstrates the ability of pressure sensors to aid in acquiring reliable OCT/OCTA images. A handheld OCT probe combined with a disposable attachment with built-in force sensors was developed and its potential for skin imaging was demonstrated. With the real-time pressure monitoring, an operator can easily determine whether the pressure applied to the skin is below the threshold of affecting OCT imaging and uniform so as to obtain repeatable OCTA images.
An improved optical scheme of planar encoder is presented in this paper. The modulation of diffractive beams from scale grating and reference grating is analyzed systematically. Based on this analysis, independent modulation of eight diffractive beams from scale grating and reference grating, with no cross effect between each other, is achieved with an improved design of easy to adjust and simplicity in structure, cost-effectiveness and flexibility in use. Furthermore, in this research, the optical configuration of the planar encoder was divided into three function areas, modulation of diffractive beams, optical subdivision and photoelectric detection. Separate design decreases the coupling relationship between various optical elements, which improves the convenience of optical alignment and reduces the cumulative error in debugging process to a certain extent. In this study, a standard interference ranging system is set up by using a grating with a 1μm period. The typical four path interference signals are collected. The quality of the interference signal verified the feasibility and superiority of the innovative design.
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