Mrso exam stuvia Study guides, Class notes & Summaries

Which of the following describe when a non-ferrous object is repulsed by static magnetic field? a. Fourier transformation b. Lenz's force c. Ohm's law d. Larmor equation - Answer b. Lenz's force What is the FDA SAR limit for the whole body in first level controlled operating mode? a. 8 W/kg for 15 mins b. 4 W/kg for 15 mins c. 3 W/kg for 10 mins d. 7 W/kg for 20 mins - Answer b. 4 W/kg for 15 mins Gadolinium contains what kind of magnetism? a. Diamagnetic b. Paramagnetic c....

The quench vent in the MR room should be inspected by who? a. facility engineers b. manufacturer engineers c. MR tech d. MRMD - Answer b. manufacturer engineers The quench vent outside the MR facility is inspected by who? a. facility engineers b. manufacture engineer c. MR tech d. MRMD - Answer a. facility engineers If a cryogen comes in contact with skin, what will happen? a. frostbite/necrosis b. nothing, in its gas form c. explode d. combust - Answer a. frostbite/necrosis ...

Peripheral nerve stimulation can be described by which of the following? a. Faraday's law of induction b. Ohm's law c. Lenz's law d. Planks Law - Answer b. Faraday's law of induction (describes the induction of electrical current in the presence of a changing magnetic field). Lenz's force describes the opposing forces created. Ohm's law deals with the resistance of current along a wire. Gad contrast has been found in the body in what form? Select all that apply. a. Water-solubl...

What is the name of the gradient coil used to produce sagittal and coronal images? a. Transverse coil b. Golay coil c. Maxwell coil d. Receiver coil - Answer b. Golay coil ("saddle coil") Which of the following is able to handle the most RF heating? a. elderly b. adult c. obese adult d. neonate - Answer d. neonate Which of the following techniques can be used to increase the echo spacing? Select all that apply. a. Increase the TR b. Decrease receiving bandwidth c. Increase...

The control room is found where? a. Zone I b. Zone II c. Zone III d. Zone IV - Answer C. Zone III Which of the following describe when a non-ferrous object is repulsed by static magnetic field? a. Fourier transformation b. Lenz's force c. Ohm's law d. Larmor equation - Answer b. Lenz's force Which of the following are recommended by the ACR Guidance document in MR safety 2013 in proper scanning of a patient? I. Metal detector II. Ferromagnetic detection system III. Writte...

The AHA's: "A Patient's Bill of Rights" include which of the following? I. consideration of privacy II. the right to have an advance directive III. considerate and respectful care IV. ready access to their medical records V. the identity of physicians, nurses, and other healthcare providers - Answer I, II, III, V Which of the statements below are related to informed consent? I. required for all x-ray procedures II. patient must be of legal age III. patient may not revoke consent ...

Purpose of RF (B1) field - Answer excite hydrogen protons RF energy is absorbed by tissues - Answer within the volume of the RF transmit coil. This is a thermogenic process. Thermogenic process - Answer Results in production of heat. Ex: RF energy absorption MRI local and whole-body tissue heating is due to - Answer magnetic induction Types of RF coil designs - Answer -linearly polarized -circularly polarized (quadrature) Function of coils - Answer -transmit only -receive only ...

IEC DB/DBA limits for MRI - Answer 140 DB 99 DBA parameters to reduce noise in MRI - Answer -thicker slices -larger FOV -smaller matrix -parallel imaging -reducing bandwidth (increasing TE) -active noise reduction -Low SAR RF mode (increase in echo spacing)-thicker slices MRI sequence that produces the most and least noise in MRI - Answer Most noise EPI/DWI least noise spin echo sequence an increase in slew rate and gradient amplitude causes an increase in - Answer Peripheral ...