This study aims at developing a non-invasive technique to evaluate periodontal loss of attachment in the oral cavity.
A method of imaging periodontal loss of attachment based on time-domain optical coherence tomography is proposed
and studied. Based on measurements, boundaries of gingival tissue and tooth were seen separated by ≈0.3 mm. Further
study is in progress to image the anatomical landmarks and evaluate the periodontal loss of attachment. The conventional
time domain OCT systems acquisition speed is limited by the speed of the mechanical scanning system. In order to
overcome this issue, a novel electro-optic based scanning system is proposed and demonstrated. Studies were performed
initially with lithium niobate and potassium titanyl phosphate crystals and the tuning range observed were low. In order
to increase the tuning range, a crystal with high electro-optic coefficient – potassium tantalite niobate was identified and
experiments were carried out to characterise the crystal and electro-optic based phase tuning is demonstrated.
Late oral radiation toxicity is a common condition occurring in a considerable percentage of head and neck cancer patients after radiation therapy which reduces their quality of life. The current examination of these patients is based on a visual inspection of the surface of the oral cavity; however, it is well known that many of the complications start in the subsurface layers before any superficial manifestation. Considering the currently suboptimal examination techniques, we address this clinical problem by using optical coherence tomography (OCT) to monitor the subsurface oral layers with micron-scale resolution images. A spectral-domain OCT system and a specialized oral imaging probe were designed and built for a clinical study to image late oral radiation toxicity patients. In addition to providing qualitative 2D and 3D images of the subsurface oral layers, quantitative metrics were developed to assess the back-scattering and thickness properties of different layers. Metric derivations are explained and preliminary results from late radiation toxicity patients and healthy volunteers are presented and discussed.
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