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A CW type handheld near infrared tissue oximeter called P-Scan tissue imager was developed for real time imaging of tissue oxygen saturation ([StO2]) and hemoglobin concentration ([Hbt]). The probe consists of eight dual-wavelength light sources (690 nm and 830 nm) and eight photon detectors forming a 2.5 cm times 2.5 cm matrix. The local tissue oxygen saturation and hemoglobin concentration was calculated...
Ophthalmic viscoelastic devices play a crucial role in cataract surgery today by protecting corneal endothelium, structures of anterior chamber and maintaining space inside the eye for safe manipulation during surgical treatment. Many factors likely affect the corneal endothelium during phacoemulsification procedure. These can be divided into 3 groups: 1) direct mechanical trauma including inadvertent...
Thermal texture maps is a new medical imaging technology. It can pinpoint the abnormal heat sources inside human body by using thermography analysis. Many clinical studies have confirmed its diagnostic value. The current principle is to establish the relationship between the inner heat source and the surface temperature distribution by means of thermal-electric analogy, and then the depth of the heat...
Psoriasis vulgaris is a chronic inflammatory skin disease with a strong genetic component, characterized by hyperkeratosis, dermal inflammatory infiltrate and increased angiogenesis. The aim of the present study was to employ thermography in evaluation of psoriatic lesions localized in different parts of the body. A series of in-patients with stable plaque type psoriasis vulgaris were included. ThermaCam...
Facial expression recognition will be studied in this paper using mathematics morphology, through drawing and analyzing the whole geometry characteristics and some geometry characteristics of the interesting area of infrared thermal imaging (IRTI). The results show that geometry characteristic in the interesting region of different expression are obviously different; facial temperature changes almost...
We introduce a method for visualising and navigating through a collection of medical infrared images. Multidimensional scaling is used to provide an overall picture of a given image database by projecting all images on a plane and arranging them so that images that are visually similar are placed close to each other. Navigation through the image set can then be performed by zooming into an area of...
In this paper, the main image processing methods used for both passive and active thermography are presented. 1st and 2nd order statistical thermal signatures are discussed. Typical methods of classification are presented
This paper introduces the reader to the functional infrared imaging, that is the application to the biomedical field of high-technology infrared imaging devices combined to the modeling of the bio-heat processes involved in the body thermoregulation. Such an approach allows defining quantitative parameters for diagnosis and monitoring. Some recent biomedical applications of the technique are then...
We evaluated three non-invasive method, thermography, laser Doppler imaging and near infrared multi-spectral imaging to quantitatively assess parameters of vascularity in Kaposi's sarcoma. The KS lesion generally has increased temperature, blood velocity and blood deoxy-hemoglobin. There is a strong correlation between temperature and blood velocity (R= 81, p<0.001). After treatment with experimental...
To explore the characteristics of thermo-source of breast tumors on thermal texture maps. Compared with the histological results, thermo-source characteristics on TTM in 106 cases with breast mass, who would undergo breast surgery, were analyzed according to the parameters such as the depth, morphology, structure, and temperatures of abnormal heat foci in order to find the differences between benign...
Following up on our previous work, we have developed one more non-contact method to measure human breathing rate. We have retrofitted our mid-wave infra-red (MWIR) imaging system with a narrow band-pass filter in the CO2 absorption band (4.3 mum). This improves the contrast between the foreground (i.e., expired air) and background (e.g., wall). Based on the radiation information within the breath...
This is a review of the state of the art in two important modalities thermal and electrical properties of living tissues - that are complementary from the point of view of medical diagnostics. Advantages and limitations of IR thermal imaging and electroimpedance measurements, including tomography procedures are discussed. Properties of both modalities are compared from the point of view of skin burn...
Thermography is a non-invasive and non-contact imaging technique used widely in the medical arena. This paper investigates the analysis of thermograms with the use of bio-statistical methods and artificial neural networks (ANN). It is desired that through these approaches, highly accurate diagnosis using thermography techniques can be established. The proposed advanced technique, is a multi-pronged...
The nurses do their phlebotomized work or the transfusion for the patients according to their experiences usually. The infrared thermal image display system for the veins location is designed. In the system, a special infrared amplification lens is designed to make the image clear. A gradual approach method for the preponderant signals amplification is described in the veins image data processing...
It is important in bio-medical field to use a simulation technique which explain the bio-process in human body, heat transfer is one of human mechanical behavior. This paper emphasize on simulate the bio-heat transfer mechanism in the human body by a 2nd order electro-circuit, then study and analyze the human heat response under different conditions
Several popular lossless image compression algorithms were evaluated for the application of compressing medical infrared images. Lossless JPEG, JPEG-LS, JPEG2000, PNG, and CALIC were tested on an image dataset of 380+ thermal images. The results show that JPEG-LS is the algorithm with the best performance, both in terms of compression ratio and compression speed
A problem of temperature distortion of medical thermography of the limb ending which results from different infrared radiant intensity of points detected by infrared detector was discussed. Further the difference of the radiant intensity is caused by that of projecting angles of points. Subsequently through related theory and experiments this paper found that the temperature shown by thermography...
Breast thermography is considered particularly valuable for early breast tumors detection. The fast growing tumor has a higher metabolic rate and associated increase in local vascularization. It will cause the occurrence of some asymmetric heat patterns. Clinical interpretation of a breast thermogram is primarily based on the asymmetry analysis of these heat patterns visually and subjectively. In...
Musculoskeletal disorders are very frequent among musicians. Diagnosis is difficult due to the lack of objective tests and the multiplicity of symptoms. Treatment is also problematic and often requires that the musician stop playing. Most of these disorders are inflammatory in nature, and therefore involve temperature changes in the affected regions. Temperature measurements were recorded with an...
Enormous efforts are made to achieve advances in image quality and acquisition time of today's standard medical imaging modalities as X-ray fluoroscopy, computed tomography, magnetic resonance and ultrasound. However, new principal diagnostic insights cannot be expected from the linear extension of the physical principles of these methods. In this paper a review is given on imaging modalities in the...
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