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Estudo da distribuição térmica da superfície cutânea facial por meio de termografia infravermelha: termoanatomia da face; Study of the facial surface skin thermal distribution by infrared thermography: facial thermoanatomy

Haddad, Denise Sabbagh
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 16/12/2014 PT
Relevância na Pesquisa
36.34%
Pelo fato da face ser uma estrutura que envolve multissistemas, ela é considerada anatomica e funcionalmente muito complexa em sua avaliação clínica. Muitos diagnósticos de doenças que afetam a região facial são realizados por meio de métodos de imagem, entretanto, as técnicas convencionais são incompletas, pois apresentam um déficit de informações em relação aos aspectos funcionais, relativos à microcirculação regional e o sistema nervoso autônomo. Para documentação objetiva destas alterações, a termografia por imagem infravermelha tem sido proposta como método auxiliar diagnóstico. O objetivo deste estudo foi identificar, mapear e quantificar pontos de referência baseados na termoanatomia da face, a partir de gradientes térmicos, em uma população adulta. A amostra constituiu-se por 161 voluntários, ambos os gêneros, entre 26 e 84 anos (63 ±15 anos). Foram identificados 28 pontos de referência termoanatômicos fixos em 94,6% da amostra. A temperatura média desses pontos de referência termoanatômicos variou entre 33,3°C a 35,6°C, sendo que o melhor valor de corte para sua correta identificação na face foi acima de 34,5ºC. Não houve diferença estatística quando os comparou entre as hemifaces correspondentes e nem quanto à idade dos voluntários (?T = 0...

Skin neoplasms characterization through standardized medical thermography

Liliana Vasconcelos Esteves
Fonte: Universidade do Porto Publicador: Universidade do Porto
Tipo: Dissertação
ENG
Relevância na Pesquisa
25.94%

Medical Thermography

Stevenson, J J
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /08/1969 EN
Relevância na Pesquisa
25.94%

An approach to the detection and management of early breast cancer

Clark, R. M.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 03/03/1973 EN
Relevância na Pesquisa
26.2%
The mortality rate for breast cancer has not changed for 40 years. The ultimate results using the various surgical techniques differ very little. Local tumour excision produces survival rates comparable with those for more radical operations. Ideal treatment should give optimal quality and quantity of survival with minimal trauma. Survival is mainly determined by the ability to live in symbiosis with the disease and in most cases clinically obvious tumours are already incurable. Clinical examination alone will not detect disease at a stage early enough for more effective treatment. Mammography and thermography can detect occult breast cancer and, in particular, thermography can be used for serial examinations in high-risk patients because the procedure is simple and without hazard.

Early detection of breast cancer using mammography, thermography and xeroradiography.

Brown, L. F.
Fonte: National Medical Association Publicador: National Medical Association
Tipo: Artigo de Revista Científica
Publicado em /09/1976 EN
Relevância na Pesquisa
25.94%

Improvement of wound healing by water-filtered infrared-A (wIRA) in patients with chronic venous stasis ulcers of the lower legs including evaluation using infrared thermography

Mercer, James B.; Nielsen, Stig Pors; Hoffmann, Gerd
Fonte: German Medical Science GMS Publishing House Publicador: German Medical Science GMS Publishing House
Tipo: Artigo de Revista Científica
Publicado em 21/10/2008 EN
Relevância na Pesquisa
25.94%
Background: Water-filtered infrared-A (wIRA) is a special form of heat radiation with a high tissue-penetration and with a low thermal burden to the surface of the skin. wIRA is able to improve essential and energetically meaningful factors of wound healing by thermal and non-thermal effects.

An Overview of Recent Application of Medical Infrared Thermography in Sports Medicine in Austria

Hildebrandt, Carolin; Raschner, Christian; Ammer, Kurt
Fonte: Molecular Diversity Preservation International (MDPI) Publicador: Molecular Diversity Preservation International (MDPI)
Tipo: Artigo de Revista Científica
Publicado em 07/05/2010 EN
Relevância na Pesquisa
26.34%
Medical infrared thermography (MIT) is used for analyzing physiological functions related to skin temperature. Technological advances have made MIT a reliable medical measurement tool. This paper provides an overview of MIT’s technical requirements and usefulness in sports medicine, with a special focus on overuse and traumatic knee injuries. Case studies are used to illustrate the clinical applicability and limitations of MIT. It is concluded that MIT is a non-invasive, non-radiating, low cost detection tool which should be applied for pre-scanning athletes in sports medicine.

Development and evaluation of thymoquinone-encapsulated chitosan nanoparticles for nose-to-brain targeting: a pharmacoscintigraphic study

Alam, Sanjar; Khan, Zeenat I; Mustafa, Gulam; Kumar, Manish; Islam, Fakhrul; Bhatnagar, Aseem; Ahmad, Farhan J
Fonte: Dove Medical Press Publicador: Dove Medical Press
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
25.94%
Chitosan (CS) nanoparticles of thymoquinone (TQ) were prepared by the ionic gelation method and are characterized on the basis of surface morphology, in vitro or ex vivo release, dynamic light scattering, and X-ray diffractometry (XRD) studies. Dynamic laser light scattering and transmission electron microscopy confirmed the particle diameter was between 150 to 200 nm. The results showed that the particle size of the formulation was significantly affected by the drug:CS ratio, whereas it was least significantly affected by the tripolyphosphate:CS ratio. The entrapment efficiency and loading capacity of TQ was found to be 63.3% ± 3.5% and 31.23% ± 3.14%, respectively. The drug-entrapment efficiency and drug-loading capacity of the nanoparticles appears to be inversely proportional to the drug:CS ratio. An XRD study proves that TQ dispersed in the nanoparticles changes its form from crystalline to amorphous. This was further confirmed by differential scanning calorimetry thermography. The flat thermogram of the nanoparticle data indicated that TQ formed a molecular dispersion within the nanoparticles. Optimized nanoparticles were evaluated further with the help of scintigraphy imaging, which ascertains the uptake of drug into the brain. Based on maximum concentration...

CURVATURE EFFECT QUANTIFICATION FOR IN-VIVO IR THERMOGRAPHY

Cheng, Tze-Yuan; Deng, Daxiang; Herman, Cila
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em //2012 EN
Relevância na Pesquisa
26.29%
Medical Infrared (IR) Imaging has become an important diagnostic tool over recent years. However, one underlying problem in medical diagnostics is associated with accurate quantification of body surface temperatures. This problem is caused by the artifacts induced by the curvature of objects, which leads to inaccurate temperature mapping and biased diagnostic results. Therefore, in our study, an experiment-based analysis is conducted to address the curvature effects toward the 3D temperature reconstruction of the IR thermography image. For quantification purposes, an isothermal copper plate with flat surface, and a cylindrical metal container filled with water are imaged. For the flat surface, the tilting angle measured from camera axis was varied incrementally from 0° to 60 °, such that the effects of surface viewing angle and travel distance on the measured temperature can be explored. On the cylindrical curved surface, the points viewed from 0° to 90° with respect to the camera axis are simultaneously imaged at different temperature levels. The experimental data obtained for the flat surface indicate that both viewing angle and distance effects become noticeable for angles over 40 °. The travel distance contributes a minor change when compared with viewing angle. The experimental results from the curved surface indicate that the curvature effect becomes pronounced when the viewing angle is larger than 60 °. The measurement error on the curved surface is compared with the simulation using the non-dielectric model...

Involuntary motion tracking for medical dynamic infrared thermography using a template-based algorithm

Cheng, Tze-Yuan; Herman, Cila
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 13/03/2013 EN
Relevância na Pesquisa
26.29%
In medical applications, Dynamic Infrared (IR) Thermography is used to detect the temporal variation of the skin temperature. Dynamic Infrared Imaging first introduces a thermal challenge such as cooling on the human skin, and then a sequence of hundreds of consecutive frames is acquired after the removal of the thermal challenge. As a result, by analyzing the temporal variation of the skin temperature over the image sequence, the thermal signature of skin abnormality can be examined. However, during the acquisition of dynamic IR imaging, the involuntary movements of patients are unavoidable, and such movements will undermine the accuracy of diagnosis. In this study, based on the template-based algorithm, a tracking approach is proposed to compensate the motion artifact. The affine warping model is adopted to estimate the motion parameter of the image template, and then the Lucas-Kanade algorithm is applied to search for the optimized parameters of the warping function. In addition, the weighting mask is also incorporated in the computation to ensure the robustness of the algorithm. To evaluate the performance of the approach, two sets of IR image sequences of a subject’s hand are analyzed: the steady-state image sequence, in which the skin temperature is in equilibrium with the environment...

Infrared thermography to evaluate lameness in pregnant sows

Amezcua, Rocio; Walsh, Shannon; Luimes, Paul H.; Friendship, Robert M.
Fonte: Canadian Veterinary Medical Association Publicador: Canadian Veterinary Medical Association
Tipo: Artigo de Revista Científica
Publicado em /03/2014 EN
Relevância na Pesquisa
36.2%
Early detection of lameness in sows is important to reduce losses and improve animal welfare. Mild-to-moderate lameness is difficult to diagnose in sows. Infrared thermography (IRT) was evaluated as a method of detecting signs of inflammation in the lower limbs as an aid in lameness detection.

Motion tracking in infrared imaging for quantitative medical diagnostic applications

Cheng, Tze-Yuan; Herman, Cila
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.29%
In medical applications, infrared (IR) thermography is used to detect and examine the thermal signature of skin abnormalities by quantitatively analyzing skin temperature in steady state conditions or its evolution over time, captured in an image sequence. However, during the image acquisition period, the involuntary movements of the patient are unavoidable, and such movements will undermine the accuracy of temperature measurement for any particular location on the skin. In this study, a tracking approach using a template-based algorithm is proposed, to follow the involuntary motion of the subject in the IR image sequence. The motion tacking will allow to associate a temperature evolution to each spatial location on the body while the body moves relative to the image frame. The affine transformation model is adopted to estimate the motion parameters of the template image. The Lucas–Kanade algorithm is applied to search for the optimized parameters of the affine transformation. A weighting mask is incorporated into the algorithm to ensure its tracking robustness. To evaluate the feasibility of the tracking approach, two sets of IR image sequences with random in-plane motion were tested in our experiments. A steady-state (no heating or cooling) IR image sequence in which the skin temperature is in equilibrium with the environment was considered first. The thermal recovery IR image sequence...

Diagnosis of dry eye disease and emerging technologies

Zeev, Maya Salomon-Ben; Miller, Darby Douglas; Latkany, Robert
Fonte: Dove Medical Press Publicador: Dove Medical Press
Tipo: Artigo de Revista Científica
Publicado em 20/03/2014 EN
Relevância na Pesquisa
25.94%
Dry eye is one of the most commonly encountered problems in ophthalmology. Signs can include punctate epithelial erosions, hyperemia, low tear lakes, rapid tear break-up time, and meibomian gland disease. Current methods of diagnosis include a slit-lamp examination with and without different stains, including fluorescein, rose bengal, and lissamine green. Other methods are the Schirmer test, tear function index, tear break-up time, and functional visual acuity. Emerging technologies include meniscometry, optical coherence tomography, tear film stability analysis, interferometry, tear osmolarity, the tear film normalization test, ocular surface thermography, and tear biomarkers. Patient-specific considerations involve relevant history of autoimmune disease, refractive surgery or use of oral medications, and allergies or rosacea. Other patient considerations include clinical examination for lid margin disease and presence of lagophthalmos or blink abnormalities. Given a complex presentation and a variety of signs and symptoms, it would be beneficial if there was an inexpensive, readily available, and reproducible diagnostic test for dry eye.

Infrared Thermography for Temperature Measurement and Non-Destructive Testing

Usamentiaga, Rubèn; Venegas, Pablo; Guerediaga, Jon; Vega, Laura; Molleda, Julio; Bulnes, Francisco G.
Fonte: MDPI Publicador: MDPI
Tipo: Artigo de Revista Científica
Publicado em 10/07/2014 EN
Relevância na Pesquisa
26.48%
The intensity of the infrared radiation emitted by objects is mainly a function of their temperature. In infrared thermography, this feature is used for multiple purposes: as a health indicator in medical applications, as a sign of malfunction in mechanical and electrical maintenance or as an indicator of heat loss in buildings. This paper presents a review of infrared thermography especially focused on two applications: temperature measurement and non-destructive testing, two of the main fields where infrared thermography-based sensors are used. A general introduction to infrared thermography and the common procedures for temperature measurement and non-destructive testing are presented. Furthermore, developments in these fields and recent advances are reviewed.

Mechanisms of Laser-Tissue Interaction: II. Tissue Thermal Properties

Ansari, Mohammad Ali; Erfanzadeh, Mohsen; Mohajerani, Ezeddin
Fonte: Laser Application in Medical Sciences Research Center Publicador: Laser Application in Medical Sciences Research Center
Tipo: Artigo de Revista Científica
Publicado em //2013 EN
Relevância na Pesquisa
26.03%
Laser-tissue interaction is of great interest due to its significant application in biomedical optics in both diagnostic and treatment purposes. Major aspects of the laser-tissue interaction which has to be considered in biomedical studies are the thermal properties of the tissue and the thermal changes caused by the interaction of light and tissue. In this review paper the effects of light on the tissue at different temperatures are discussed. Then, due to the noticeable importance of studying the heat transfer quantitatively, the equations governing this phenomenon are presented. Finally a method of medical diagnosis called thermography and some of its applications are explained.

Difference in ocular surface temperature by infrared thermography in phakic and pseudophakic patients

Sniegowski, Matthew; Erlanger, Michael; Velez-Montoya, Raul; Olson, Jeffrey L
Fonte: Dove Medical Press Publicador: Dove Medical Press
Tipo: Artigo de Revista Científica
Publicado em 09/03/2015 EN
Relevância na Pesquisa
25.94%

Thermography in Neurologic Practice

Neves, Eduardo Borba; Vilaça-Alves, José; Rosa, Claudio; Reis, Victor Machado
Fonte: Bentham Open Publicador: Bentham Open
Tipo: Artigo de Revista Científica
Publicado em 26/06/2015 EN
Relevância na Pesquisa
26.55%
One kind of medical images that has been developed in the last decades is thermal images. These images are assessed by infrared cameras and have shown an exponential development in recent years. In this sense, the aim of this study was to describe possibilities of thermography usage in the neurologic practice. It was performed a systematic review in Web of Knowledge (Thompson Reuters), set in all databases which used two combination of keywords as “topic”: “thermography” and “neurology”; and “thermography” and “neurologic”. The chronological period was defined from 2000 to 2014 (the least 15 years). Among the studies included in this review, only seven were with experimental design. It is few to bring thermography as a daily tool in clinical practice. However, these studies have suggested good results. The studies of review and an analyzed patent showed that the authors consider the thermography as a diagnostic tool and they recommend its usage. It can be concluded that thermography is already used as a diagnostic and monitoring tool of patients with neuropathies, particularly in complex regional pain syndrome, and stroke. And yet, this tool has great potential for future research about its application in diagnosis of other diseases of neurological origin.

Microwave thermography for the detection of breast cancer a discussion and evaluation of a 6 GHz system

Rosen, Bruce Robert
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 194 leaves; 12440093 bytes; 12439848 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
36.2%
by Bruce Robert Rosen.; Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1980.; MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.; Bibliography: leaves 190-193.

Sobreposição de imagens de termografia e ressonância magnética: uma nova modalidade de imagem médica tridimensional

Sanches, Ionildo José
Fonte: Curitiba Publicador: Curitiba
Tipo: Tese de Doutorado Formato: 4,79 MB
POR
Relevância na Pesquisa
36.39%
Infrared (IR) imaging is a noninvasive diagnostic technique that allows the examiner to evaluate and quantify changes on skin surface temperature. Since changes over the human body surface temperature are continuous, it is difficult to associate anatomical details, as well to associate skin temperature with internal structures or organs. Though providing significant information to clinical diagnosis, this technique does not allow evaluating anatomical details of the imaged region. In this work it is presented a new image fusion method for combining 3D Magnetic Resonance Images (or Computed Tomography) and 2D thermal images. The result is a 3D thermographic imaging that can improve medical diagnosis of certain human diseases, such as peripheral vascular disease, diabetic foot, breast and thyroid tumors,sinusitis, cephalalgia, rheumatic disorder and others inflammations process, i.e., diseases that can be diagnosis through the body surface thermal mapping. In the development of this interdisciplinary work of Biomedical Engineering, the knowledge of Digital Image Processing, Computer Graphics, Machine Vision, Computer Programming, Radiology, Medical Imaging and Thermography, was necessary, interacting with areas of Medicine,Computer Science and Electrical Engineering. First...

Digital Thermography of the Fingers and Toes in Raynaud's Phenomenon

Lim, Mie Jin; Kwon, Seong Ryul; Jung, Kyong-Hee; Joo, Kowoon; Park, Shin-Goo; Park, Won
Fonte: The Korean Academy of Medical Sciences Publicador: The Korean Academy of Medical Sciences
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
36.34%
The aim of this study was to determine whether skin temperature measurement by digital thermography on hands and feet is useful for diagnosis of Raynaud's phenomenon (RP). Fifty-seven patients with RP (primary RP, n = 33; secondary RP, n = 24) and 146 healthy volunteers were recruited. After acclimation to room temperature for 30 min, thermal imaging of palmar aspect of hands and dorsal aspect of feet were taken. Temperature differences between palm (center) and the coolest finger and temperature differences between foot dorsum (center) and first toe significantly differed between patients and controls. The area under curve analysis showed that temperature difference of the coolest finger (cutoff value: 2.2℃) differentiated RP patients from controls (sensitivity/specificity: 67/60%, respectively). Temperature differences of first toe (cutoff value: 3.11℃) also discriminated RP patients (sensitivity/specificity: about 73/66%, respectively). A combination of thermographic assessment of the coolest finger and first toe was highly effective in men (sensitivity/specificity : about 88/60%, respectively) while thermographic assessment of first toe was solely sufficient for women (sensitivity/specificity: about 74/68%, respectively). Thermographic assessment of the coolest finger and first toe is useful for diagnosing RP. In women...