practice test 1 armrit questions and answers

practice test 1 armrit questions and answers different tissues that have signals that appear similar on a mr image are described as: - Ans ️️ - isointense In a large main magnetic field such as those employed in MRI, the motion of a hydrogen proton has been described as wobbling like a spinning top. This motion is called: - Ans ️️ -Prescession Magnetic resonance imaging is derived from the process known as: - Ans ️️ -Nuclear magnetic resonance Once the net magnetization vector (nmv) has moved away from equilibrium, the following will occur: - Ans ️️ -The transverse component will increase In MRI, substances respond to a specific radio frequency which is known as: - Ans ️️ - Resonance Frequency The introduction of gadolinum based contrast enhancement agents by intra-venous injection can involve passing through as abnormal blood brain barrier. The tissue compartments involved are the: - Ans ️️ -intravascular to interstitial T2 is the measurement of time for the transverse compnent of the nmv to decrease what percentage of its maximum value after application of a 90* radio-frequency pluse? - Ans ️️ - 37% In the USA the MRI systems main magnet field and the vector that represents it is symbolized - Ans ️️ -B0 the resonance frequency of any substance in a magnetic field can be calculated by employing the - Ans ️️ -Larmor equation in a pulse sequence transmitting a initial 90-degree radio frequency pulse will cause the nmv to: - Ans ️️ -shift in both size and direction