Junguo Zhang

Background: In vivo, non-invasive optical coherence tomography permits high-resolution imaging of tissue surfaces and subsurfaces, with the potential capability for detection and mapping of epithelial pathologies. Purpose: To evaluate the clinical capability of non-invasive in vivo OCT for diagnosing oral dysplasia and malignancy. Experimental Design: In 50 patients with oral lesions, conventional clinical examination was followed by OCT imaging, then standard biopsy and histopathology. Two blinded, pre-standardized investigators separately diagnosed each lesion based on OCT and histopathology. Results: Intra- and inter-observer agreement between diagnoses based on histopathology and imaging data was excellent, with λ values between 0.844 and 0.896. Sensitivity and specificity were also very good. Conclusions: These data demonstrate the excellent capability of in vivo OCT for detecting and diagnosing oral premalignancy and malignancy in human subjects. © 2009 Wiley-Liss, Inc.

Early detection of cancer and its precursors remains the best way to ensure patient survival and quality of life. Our specific aim is to test a multimodality approach to noninvasive diagnostics of oral premalignancy and malignancy. In the hamster cheek pouch model, in vivo optical coherence tomography and optical Doppler tomography map epithelial, subepithelial, and vascular change throughout carcinogenesis. In vivo multiwavelength multiphoton and second-harmonic generated fluorescence techniques provided parallel data on surface and subsurface tissue structure, specifically collagen presence and structure, cellular presence, and vasculature. Images are diagnosed by two blinded, prestandardized investigators using a scale from 0 to 6 for all modalities. After sacrifice, histopathology is evaluated on a scale of 0 to 6. Imaging data are reproducibly obtained with good accuracy. Carcinogenesis-related structural and vascular changes are clearly visible to tissue depths of 2 mm. Sensitivity and specificity compare well with conventional techniques. Our conclusions are that OCT/ODT and MPM/SHG are promising noninvasive in vivo diagnostic modalities for oral dysplasia and malignancy. © 2005 Society of Photo-Optical Instrumentation Engineers.

This paper delves into the complex and conflicting relationship between the body-subject and body-object, as well as the self and the other, within the context of anorexia nervosa. Within the field of phenomenology of medicine and health, the emphasis tends to be on the dimension of the lived body, with limited attention given to the physical dimension of the body. Recognizing the work of scholars who have acknowledged this oversight and made progress in addressing it, this paper aims to further unify the two bodily dimensions of the lived body and the physical body by drawing primarily on Husserl’s phenomenology of constitution and intersubjectivity. The central argument put forth is that in the case of anorexia nervosa, confronted with the inherent split between these dimensions and the conflicting relationship between the self and other, it is crucial to adhere to the constitutive principle of irreducibility of subjectivity. Moreover, there is a need to promote the constitutive interplay between the two dimensions and accentuate the constitutive dialectic structure of the self and other. Through these insights, the paper offers potential avenues for understanding and addressing the lived experiences of individuals battling anorexia nervosa.

This article adopts Husserl’s transcendental phenomenology to explore the complex relationship between patients and physicians. It delves into the coexistence of two distinct voices in the realm of medicine and health: the “voice of medicine” and the “voice of life-world.” Divided into three sections, the article emphasizes the importance of shifting from a scientific-medical attitude to a more personalistic approach in physician–patient interactions. This shift aims to prevent depersonalization and desubjectification. Additionally, it highlights the equal and irreducible nature of patients while acknowledging the vital role physicians hold in the realm of illness. The article stresses the need for a balanced and equitable relationship between both parties, rooted in the shared life-world. Moreover, empathy is underscored as a crucial element in fostering meaningful dialogue, wherein understanding diverse perspectives and attitudes towards illness is paramount. The article argues that differences between patients and physicians are necessary for empathy, while shared similarities form its foundation. Ultimately, a harmonious relationship facilitates empathy and enables the constitution of a new sense of life for both patients and physicians.

The discussion of the debate on the two approaches to Husserl’s phenomenology and of the debate between David Carr and Dan Zahavi on the paradox of subjectivity signify a fundamental problem: What is the relationship between subjectivity, intersubjectivity, and the world? For this problem, I argue that subjectivity, intersubjectivity, and the world are Co-originary in Husserl’s transcendental phenomenology, in the sense of their structural necessity. I define this co-originary relationship from the perspective of unification of constitution and givenness—this unification establishes their equiprimordial relationship. According to this co-originariness, subjectivity, intersubjectivity, and the world are not three isolated and independent origins, but are interdependent and absolute origins of sense of being in their own right. In sum, this essay proposes that transcendental co-originariness can be recognized as another way of reading Husserl’s phenomenology.

Purpose: To assess noninvasive optical coherence tomography and optical Doppler tomography for early detection and evaluation of chemotherapy-induced oral mucositis. Experimental Design: Cheek pouches of 10 Syrian golden hamsters were imaged using OCT/ODT during development of chemotherapy-induced mucositis. I.p. injections of 5-fluorouracil and mechanical irritation induced oral lesions. At 2, 4, 7, and 11 days, one hamster was sacrificed and processed for histopathology. OCT images were visually examined; ODT results were semiquantified. Imaging data were compared with histologic findings. Results: During the development of mucositis, OCT/ODT identified the following events: change in epithelial thickness, loss of surface keratinized layer continuity, loss of epithelial and submucosal integrity, changes in axial blood flow velocity, and changes in blood vessel size. The semiquantitative imaging-based scoring system identified the severity of mucositis as defined by histopathology. The combination of imaging criteria used allowed for the detection of early, intermediate, and late mucositic changes. Imaging data gave higher scores compared with clinical scores early on, suggesting that the imaging-based diagnostic scoring was more sensitive to early mucositic change than the clinical scoring system. Once mucositis was established, imaging and clinical scores converged. Conclusion: OCT/ODT identified chemotherapy-induced oral changes before their clinical manifestation, and the proposed scoring system for oral mucositis was validated for the semiquantification of mucositic change. © 2007 American Association for Cancer Research.