Casa Loma Registry Review Test Guide |UPDATED| #1

Casa Loma Registry Review Test Guide |UPDATED| #1 d. Low energy electromagnetic radiation, measure in MHz The Radiofrequency used in MR imaging is Select one: a. Low energy electromagnetic radiation, measure in KHz b. High energy electromagnetic radiation, measure in MHz c. High energy electromagnetic radiation, measure in MHz d. Low energy electromagnetic radiation, measure in MHz d. RF Zipper Artifact Making sure the MRI room scan door is completely closed prevents what type of artifact in MRI images? Select one: a. Motion b. Chemical Shift c. Cross Talk d. RF Zipper Artifact d. Both A & C When portions of the patient's body are outside the field of view, but within the area of RF excitation, a/an ____________ artifact is likely to occur. Select one: a. Aliasing b. Truncation c. Wrap around d. Both A & C d. 2 minutes If a conventional spin echo pulse sequence takes 12 minutes to acquire, how long would a fast spin echo sequence using an ETL of 6 take if all other factors affecting scan time remain the same? Select one: a. 6 minutes b. 4 minutes c. 1 minute d. 2 minutes b. Frequency Encoding The receive bandwidth is related to the slope of the __________ gradient. Select one: a. Transmitting b. Frequency Encoding c. Slice Selection d. Phase Encoding d. A & C Reducing the TR _________________. Select one: a. Decreases the SNR of the image. b. Reduces the contrast based on the T2 relaxation of the tissues. c. Reduces the proton density contrast weighting d. A & C c. 63% loss of magnetization in the XY plane T2 is defined as the time necessary for: Select one: a. 37% loss of magnetization in the Z axis b. 37% loss of magnetization in the XY plane c. 63% loss of magnetization in the XY plane d. 63% loss of magnetization in the Z axis. b. Torque A neuro aneurysm clip within the magnet will experience a force of _____________. Select one: a. Attraction b. Torque c. Both A & B d. Neither since it is diagmagnetic b. Shorter TE selection A method of reducing the duration of the RF excitation pulse is _________. Select one: a. Fractional Echo (TE) b. Shorter TE selection c. Fractional RF d. Increase the bandwidth c. Faraday's Law of Induction The process where a changing magnetic field induces a voltage in a coil is known as: Select one: a. Precession b. Ohm's Law c. Faraday's Law of Induction d. Larmour Equation d. 512 If a phase resolution of 256 is desired and 2 NSA are