ARMRIT Review Test Questions & Answers 100% Verified!

The exact middle of the bore of the magnet is termed: - ANSWER-Isocenter Without proper safety limits on the MR system exposure to the time-varying magnetic fields created by the rapid switching of the gradient could create a potential environment for: - ANSWER-Including electrical current in the patient's tissues Faraday's Law deals with induction of a current by a magnet. true or false? - ANSWER-true The orientation of the main magnetic field of a low field permanent magnet is vertical. True or false? - ANSWER-True ; permanent lowfield magnets utilize a magnetic field oriented vertically Superconductive magnets have high homogeneity compared to other magnets types. true or false? - ANSWER-true ; One advantage of a superconductive magnet is its excellent homogeneity The start up cost for a superconductive magnet is high. true or false? - ANSWER-true ; Initial cost may exceed two million dollars in addition to the expensive cyrogen up keep. A type of magnet that is generally used for a 1.0t or a 1.5t system is a: - ANSWER-Superconductive magnet The basic type of magnets used in MR are: - ANSWER-Permanent, resistive , superconductive A procedure called shimming: - ANSWER-Adjust the magnetic field to achieve the most homogenous field Superconductive magnets utilize two types of cyrogens. - ANSWER-Helium and nitrogen Types of transmit coils are: - ANSWER-a) Body, b) head, c) volume coils, d) all of the above. D all of the above Various types of receiver coils are: - ANSWER-a) solenoidal coil, b) volume,birdcage,surface coil, c) Helmholtz pair coil, d) All of the above: D all of the coils are true receiver coils To gain SNR and gain high resolution: - ANSWER-Use a small surface coil Which of the following is not an example of a surface coil: - ANSWER-body coils are not surface coils In a cross-sectional view of the magnet bore, which set of coils are the closest to the bore? - ANSWER-RF coil- the cross sectional of the MR system reveals the order of thecoils: the magnet bore, then the RF coils, Then the gradient coils, then the shim coils & the outer most are magnet coils. MR systems can be shielded by two processes. They are: - ANSWER-Passive and active shielding The more expensive type of shielding that uses additional solenoid magnets outside the cyrogen bath that restricts the magnetic field line to an acceptable location is the: - ANSWER-Active- passive shielding can be accomplished by lining the walls with steel while the more expensive alternative is active shielding Surface coils are connected inside the scanner by cables. These cables shouldnt touch th