D. Sharath

Evaluation of Mammary Cancer in 7,12-Dimethylbenz(a)anthracene-Induced Wister Rats by Asymmetrical Temperature Distribution Analysis Using Thermography: A Comparison with Serum CEA Levels and Histopathology

Animal surface temperature profile captured using infrared camera is helpful for the assessment of physiological responses associated with the regulation of body temperature. Diagnosing breast cancer in early stage itself has a greater effect on the prognosis. In this work, asymmetrical temperature distribution analysis of chemical carcinogen 7,12-dimethyl benz(a)anthracene-induced in the lower right flank region of Wistar rats (n = 6) was carried out to test the potential of thermography in diagnosing mammary cancer and tumor growth over a period of nine weeks in comparison with histopathology results as standard. Temperature difference between the tumor induced lower right and left side of flank region was significant (with P value <0.001), whereas in the abdomen and shoulder there was no significant difference in temperature between right and left sides. Percentage of asymmetrical temperature difference in the tumor induced lower flank region was 0.5 to 2%, whereas in the other regions it was <0.5%. Green pixel distribution in RGB color histogram was asymmetrical in the tumor induced lower flank region. Temperature reduction was observed in the tumor induced region after the seventh day of carcinogen induction. Asymmetrical thermogram analysis is the best method of diagnosing mammary cancer and for studying tumor development.

Evaluation of Corrosion Detection in Reinforced Concrete using Infrared Thermography

Corrosion of reinforcing steel and other embedded metals is the leading cause of deterioration in reinforced concrete strucutres. The steel corrosion products ,occupies a greater volume than the steel. This expansion creates tensile stresses in the concrete, which can eventually cause cracking, delamination, and spalling of cover concrete ,leading to further degradation. Corrosion of steel in concrete is an electrochemical process, which takes place as a result of the formation of a corrosion cell. Exposure of reinforced concrete to chloride ions in an aggressive environment is the primary cause of premature corrosion of steel reinforcement. Corrosion loss consumes considerable portion of the budget of the country by way of either restoration measures or reconstruction. By monitoring the structures for corrosion performance and taking suitable measures at the appropriate time could effect enormous saving. This paper studies application of lock in thermography for detection of corrosion in reinforced bars and developed crack at various depth due to the accelerated corrosion in reinforced bar. http://dx.doi.org/10.21611/qirt.2015.0150