In this section, a comprehensive evaluation is made in terms of other imaging techniques and information is provided about laser beam and laser therapy. Thermography’s place in medicine is emphasized and information is provided about sound waves and especially ultrasonography and echocardiography are examined and details are given about the piezoelectric principle. Electroencephalography, which is increasingly important in medicine, and the resulting EEG waves are evaluated by examining the montage axes. Electrocardiography, which is important in terms of heart examinations, is explained by defining the Einthoven triangle; information is given about the heart’s stimulus system and montage types are specified. Electrocardiogram and the meanings of the differences are explained, and basically, phonocardiography and vector electrocardiography were explained. At the end of each section, the subject is detailed with explanatory questions.