Different methods of processing thermographic images to evaluate the carpal temperature of healthy calves

Pedro Augusto Cordeiro Borges; Danilo Conrado Silva; Nivan Antônio Alves da Silva; Valesca Henrique Lima; Paulo José Bastos Queiroz; Naida Cristina Borges; Luiz Antônio Franco da Silva

doi:10.1590/1809-6891v22e-70559E

Authors

Pedro Augusto Cordeiro Borges Instituto Federal de Educação, Ciência e Tecnologia Goiano (IFGoiano), Campus Urutaí, Urutaí, Goiás, Brasil https://orcid.org/0000-0003-4674-3080
Danilo Conrado Silva Universidade Estadual de Goiás (UEG), Campus Oeste, São Luís dos Montes Belos, Goiás, Brasil. https://orcid.org/0000-0002-4984-9019
Nivan Antônio Alves da Silva Universidade Federal Rural de Pernambuco (UFRPE), Clínica de Bovinos de Garanhuns, Pernambuco, Brasil https://orcid.org/0000-0003-2567-9243
Valesca Henrique Lima Universidade Federal de Goiás (UFG), Escola de Veterinária e Zootecnia (EVZ), Goiânia, Goiás, Brasil. https://orcid.org/0000-0002-3818-0508
Paulo José Bastos Queiroz Universidade Federal de Goiás (UFG), Escola de Veterinária e Zootecnia (EVZ), Goiânia, Goiás, Brasil. https://orcid.org/0000-0002-4453-7016
Naida Cristina Borges Universidade Federal de Goiás (UFG), Escola de Veterinária e Zootecnia (EVZ), Goiânia, Goiás, Brasil. https://orcid.org/0000-0001-9387-3684
Luiz Antônio Franco da Silva Universidade Federal de Goiás (UFG), Escola de Veterinária e Zootecnia (EVZ), Goiânia, Goiás, Brasil. https://orcid.org/0000-0002-9893-4914

DOI:

https://doi.org/10.1590/1809-6891v22e-70559E

Abstract

The aim of this study was to compare three methods of processing thermographic images for the evaluation of carpal temperature in healthy calves. Additionally, we sought to evaluate the thermal symmetry between the contralateral carpi of these calves. Thermographic images were obtained from both carpi of eight healthy calves aged between 20 and 45 days with a mean weight of 38.65 ± 2.27 kg. Using GRAYESS® IRT Analyzer 7 software, the total temperature (Ttot), region-of-interest temperature (Troi), and maximum mean temperature (Tmax) were determined. There was no difference between the temperatures obtained by the Ttot and Troi methods. Tmax showed higher temperatures (p < 0.01) than the other methods. The three image processing methods showed high and significant positive correlations for the temperature of the right and left carpi of healthy calves. Tmax presented a higher correlation coefficient (r = 0.99) than the two other methods, which suggests a greater sensitivity for identifying thermal variations among the contralateral carpi. The 99% confidence interval for the difference between the temperatures of the right and left carpi (Δr-l) was between 0.03 and 0.26°C; thus, a temperature variation within that range does not refer to pathologic processes.
Key words: cattle; joint; thermal symmetry; thermography

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