RESUMO
Three aspects of patient exposure to electromagnetic fields have been cause for concern since the introduction of MRI scanners: the radio-frequency transmitter fields Radio frequency electromagnetic field [RF], the time dependant gradient fields, and the static magnetic field [MF], the three fields are of special concern because they are intrinsic and essential features of the scanner operation and, on same level, each of them inter acts with every component of the patient body. The aims of this study were [l] To assess the hematological effect of Radio frequency radiation [RF] of the range used in the MRI where the resonance occurs. [2] To assess the possible effects when considering the type of energy at different exposure times on different blood parameters .The experiment has been done in the Laboratory Physics, University Of Khartoum, and Military hospital, Elribat teaching hospital. The blood samples were analyzed before and directly after the exposure. The study showed that exposure to the radio frequency fields and The exposure to both magnetic field and radiofrequency fields may increase and decrease different blood parameters significantly. The above results show that there is a big doubt about the safety of MRI techniques as far as the results and the literature review indicate effects on some blood parameters. Therefore the safety considerations must be reviewed and needs to be clearer
RESUMO
The study was carried out to investigate the bio-effects of repeated exposure to high intensity electromagnetic fields [EMFs] used in the medical field. An in vivo study was done by using repeated exposure of Swiss Albino Rats to MRI machine [1.5 Tesla, 64.85MHZ]. The rats were exposed to combination of both magnetic fields and radio frequency electromagnetic fields, daily for 30 minutes, 1 hour, three times per week for 2 weeks. The exposure was under the protocol of lumber spine scanning. A histological study was conducted on some of the rats' vital organs and rats' body weight to detect any cellular effects. A significant reduction in the rats body weights gain was detected. The histological findings were severe hemorrhage, necrosis in cardiac muscles, kidney, liver, dilatation of blood vessels in bone marrow, bone cartilage atrophy. No histological changes were detected in all the organs of the control group, in addition there is no reduction in their body weight. The above results showed that there is a big doubt about the safety of MRI techniques as far as the results and the literature review indicates severe effects on some vital organs. Therefore the safety considerations as repeated exposure to the MRI techniques must be reviewed and needs to be clearer