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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Experimental research of specific absorbed rate at 3.0 Tesla magnetic rezonance scanner
 RÁČEK, Jaroslav
The issue of the Specific Absorbed Rate (SAR) is becoming more interesting mainly due to new installations of MRi scanners of the magnetic field intensity of 3.0 Tesla (T). 3 T devices are characterized by quadruplicated SAR comparing to 1, 5 T devices. As it is possible to exceed set safety limits during examinations, it is important to monitor the SAR level. This thesis describes relations among parameters of examinational sequences, a patient{\crq}s weight and the Specific Absorbed Rate. The SAR also causes so called thermal stress, which can be dangerous namely for patients with impaired thermoregulation. Reaching the maximum allowed level of SAR causes the examination to be discontinued; the examination then can be more affected by artifacts or completely prematurely stopped. Most of the tests, during which the parameters of examinational sequences were changed, were performed using phantom. A part of this thesis is devoted to results of practical examinations of patients. Only standard examinational processes approved by the Ethical Committee of the Central Military Hospital Prague were performed while examining these patients. The results of individual tests are evaluated comprehensively in conclusion of this thesis and put into relations with practically used procedures of examination. Methods and procedures of reductions the SAR level are described in that part of this thesis.
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