## 3 Standardization in Thermographic Research  
Continuous progress in the field of thermovision based on establishing measurement standards for thermography, the development of computer technologies, and the design of sensitive detectors makes the analysis of thermal temperature distributions on selected surfaces of various objects applicable in more and more different fields of science and technology, including medicine and rehabilitation. Due to the very different technical capabilities of cameras, the individual differences in temperatures of selected areas, and the diversity of research objectives, it is necessary to standardize the technique of thermal imaging in medicine. General, basic guidelines for thermographic research were introduced in 2002 and then, in 2015-2016, detailed guidelines for research in the area of neuromuscular-skeletal, dental, and systemic diseases were defined [19]. In 2017, a consensus was reached and TISEM (Thermographic Imaging in Sports and Exercise and Medicine checklist) was developed, based on [PERSON] et al. [20]. The temperature distribution of the human body surface is influenced by many factors, which translates directly into the results of thermographic tests; therefore, the impact of any stimuli interfering with the measurements should be minimized and the rules for the proper conduct of the experiment should be followed and described in detail in the methodology of thermal imaging studies. There are many conditions for the technical and interpretative correctness of thermal imaging studies (environmental, individual, and technical). The most important are the research room's conditions, the patient preparation and pre-examination acclimatization period, the adjustment equipment, and the subject of the size and position of the regions of interest (ROI). The detailed conditions for carrying out thermographic measurements for medical purposes are determined by the standards that have been developed by thermographic associations such as the American Academy of Thermology (AAT), the European Thermological Society, and the Polish Society of Thermographic Diagnostics in Medicine. Based on the guidelines of these societies and the experiences of researchers, the requirements for thermo-imaging standards in medicine have been compiled below, taking into account factors influencing the recorded results:  
1. Concerning the examination room where the thermovision measurements are carried out: it should allow for the convenient and correct placement of the measuring devices and the visualization of the entire examined area and it should not be smaller than 6 m\({}^{2}\) and it should be without unnecessary equipment; it should have a stable temperature and a relative humidity system; air-conditioning equipment should be located so that draughts are not directed at the patient and that overall air speed is kept as low as possible; airflow should be inferior to 2 m/s and the illumination should have protections to avoid incident lightning over the subject; laboratory windows have to be shut (to prevent solar radiation). 2. Concerning the environmental conditions: a range of temperatures from 18 \({}^{\circ}\)C to 25 \({}^{\circ}\)C should be adjustable; the selection of the ambient temperature in which the research is conducted depends on the type and purpose of the tests (recommendation for the examination of the extremities: a warmer ambient temperature of 22-24 \({}^{\circ}\)C; large body surfaces examinations within 25-27 \({}^{\circ}\)C; lower temperatures enable better diagnosis of inflammatory changes (20 \({}^{\circ}\)C)); for medical examinations, it is recommended to keep the room humidity at the level of 45-55%. 3.