MRI ARMRIT physics Exam Questions and Answers

MRI ARMRIT physics Exam Questions and Answers T2 is the measurement of time for the transverse component of the net magnetization vector to decrease what percentage of its maximum value after the application of a 90 degree radio frequency pulse - Ans ️️ -37% The NMV is rotated to the physical negative Z axis by applying a...? - Ans ️️ -C)180 pulse Increasing which parameter is considered the "best" technique for improving image quality? - Ans ️️ -C)NEX Studies have concluded that static magnetic fields up to what tesla produce no substantial harmful biological effects. - Ans ️️ -C)2.0 Tissues that have low (short) relaxation times have: - Ans ️️ -Higher relaxation rates Nuclei in their natural enviroment ( in the absence of a significant magnetic field) are aligned... - Ans ️️ -Randomly Following the injection of a gadolinium enhancement agent, the pulse sequence most commonly employed is a... - Ans ️️ -C)T1 weighted Employing a pulse sequence with a long TR & a long TE will result in tissues with a short T2 value appearing WHAT & tissues with a long T2 appearing WHAT on the resultant image. - Ans ️️ -D)Dark/bright Which gradient axis direction is typically (for educational purposes) designated as the slice selection gradient? - Ans ️️ -C)Logical Z gradient Electromagnetic coils placed strategically to contain the fringe fields. - Ans ️️ -2)Active shielding 1 milliliter of H2O contains how many hydrogen protons? - Ans ️️ -6 ×10 to th 23power