10
May
What Is A Brain Artifact. Take me to the 1st Artifact QA. Finite sampling k-space encoding and Fourier transformation may cause aliasing and Gibbs artifact. Calcium salts as found in cortical bone are the most strongly diamagnetic substances in the human body. Chemical Shift Artifact.
At first brain lesions may not produce any symptoms. Some artifact may mimic true epileptiform abnormalities or seizures. Artifacts are signals recorded by EEG but not generated by brain. MRI requires seamless integration and interplay of magnet gradient coil system RF system and pulse sequence computer each of which is a complicated subsystem. Those new to the world of EEG inter-pretation are often surprised to learn that at least half the challenge of EEG reading consists of identifying artifacts correctly so as not to mistake them for true EEG cerebral activity. This could be surgical devices dental implants bullets andor shrapnel can also show artifact.
Awareness of logical topographic field of distribution for true EEG abnormality is important in distinguishing artifact from brain waves.
Tissue-related Artifacts Motion-related Artifacts. MRI requires seamless integration and interplay of magnet gradient coil system RF system and pulse sequence computer each of which is a complicated subsystem. Calcium salts as found in cortical bone are the most strongly diamagnetic substances in the human body. Sometimes lesions appear in a specific area of the brain. A slight difference exists between the precessional frequencies of the hydrogen protons in fat and H 2 O. At other times the lesions are present in a large part of the brain tissue.