ABSTRACT
The University General Hospital of Alexandroupolis was established in 2003 to cover Eastern Macedonia and Thrace Districts of Northern Greece. The hospital has two interventional cardiology units and the occupational radiation exposure of the cardiologists was the highest of all specialties using ionising radiation. In order to aid in decreasing the radiation dose levels, a seminar was organised for all personnel working in interventional radiology field. After this, an important reduction of the radiation dose of the cardiologists was noted. Training in radiation protection is essential to reduce the radiation doses and consequently the deterministic and stochastic effects of ionising radiation of cardiologists working in interventional radiology.
Subject(s)
Cardiology , Inservice Training , Occupational Exposure/prevention & control , Practice Guidelines as Topic , Radiation Injuries/prevention & control , Radiation Protection , Radiology, Interventional/education , Education, Professional , Greece , Humans , Physicians , Radiation DosageABSTRACT
Magnetoencephalogram (MEG) recordings of 8 patients with advanced Alzheimer Disease (AD) and 9 normal individuals were obtained with a 122-channel whole head biomagnetometer SQUID (Superconductive Quantum Interference Device) to record the minute magnetic fields generated by the brain. The obtained MEG signals were analyzed using linear signal analysis techniques such as Fourier Transform in order to get the frequency distribution of MEG values. The obtained frequencies from all MEG sensors located outside the scalp of each subject were stored for evaluation. From this evaluation it was concluded that in patients with AD the dominant frequencies were significantly lower compared to normal individuals.
Subject(s)
Alzheimer Disease/pathology , Alzheimer Disease/physiopathology , Brain/physiopathology , Magnetoencephalography/methods , Aged , Aged, 80 and over , Brain Mapping , Female , Fourier Analysis , Humans , Male , Middle AgedABSTRACT
OBJECTIVES: Non-linear analysis was applied on MEG signals of Alzheimer Disease (AD) patients in order to investigate the underlying complexity of the brain dynamics. MATERIALS AND METHODS: A Single channel SQUID was used to record the MEG signals in 9 AD patients and 5 normal individuals. The magnetic activity, for each patient, was recorded from a total of 64 points of the skull (32 points from each temporal lobe). Nonlinear analysis was applied in the abnormal MEG points of the brain. RESULTS: In AD patients some recorded points were found with high amplitudes and low frequencies in magnetic activity. By applying nonlinear analysis in these records low values in the correlation dimension D of the reconstructed phase space were found. CONCLUSIONS: SQUID obtained MEG signaling from brains of AD patients showed a lower complexity compared to the brain of normal subjects.
