The biophysical modelling of the medical devices in the field of biophysics

Abstract

In medicine we live the period of enthusiastic use of the models that use, one way or the other, various devices created and invented on the basis of theoretical knowledge of biophysics. Further on we will deal with only three directions: ultrasound application, computer tomography and magnetic resonance. Currently, the widest field of application of the ultrasounds in medicine is the one of exploration and diagnostic. The computer tomography (CT) used X rays to perform detailed images of the structures of the organism. A part of the scanner can be tilted, which allows taking images of the studied are in various positions. The images are memorized in a computer. The images of the computer tomography scanner can be taken before or after the administration of the contrast substance. With the MRI examination, very small lesions (1-2 mm) can be detected and there is the possibility of Multiplan representation. In the case of medical investigations using MRI, the body of the patient is placed on a horizontal table along a very strong magnetic field and with a coil another type of radiofrequency is used which subsequently is recorded. The first uncertainty relation: Living organism cannot be studied in the space, at any small or big dimensions because at the level of those subsystems or extrasystems the characteristics of life disappear. The second uncertainty relation: Living organisms cannot be studied in time, at any long or short intervals, because at the level of these time values the living system do not have the characteristics of life.