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MRI 216 REVIEW
Kahoot!
| Question | Answer |
|---|---|
| The angle to which the NMV moves out of alignment. A. Precession B. Flip Angle C. Angular Momentum D. Resonance | B. Flip Angle |
| Inside the magnet are the shim coils, the gradient coils, and the: a. Faraday cage b. RF coils c. NMV d. Passive shielding | b. RF Coils |
| The most abundant atom in the body is hydrogen and is found in: a. fat b. water c. protein d. both a and b | d. both A and B |
| In order to get an axial slice through a patient's head the _____ gradient must be turned on. a. Q b. Y c. Z d. X | c. Z |
| The correct order of coils in MR machine from innermost to outermost is: a. RF, shim, gradient b. shim, RF, gradient c. gradient, shim, RF d. RF, gradient, shim | d. RF, gradient, shim |
| The process that must be completed to produce an MR image include: a. RF excitation b. Nuclear alignment c. spatial encoding d. image formation e. ALL the above | ALL answers are correct - everything is needed |
| Paramagnetic materials have unpaired: a. nuclei b. ions c. atoms d. electrons | d. electrons |
| Paramagnetic materials include all the following except: a. titanium b. iron c. aluminum d. platinum | b. iron |
| What is an advantage of a permanent magnet? a. high power supply b. no power supply c. large fringe field d. low cryogen requirement | b. no power supply |
| To maintain superconductivity the current carrying loops of wire are supercooled with: a. cryogens b. halogens c. refrigerants d. coolants | a. cryogens |
| RF shielding is accomplished with the use of a: a. foam insulation b. Faraday cage c. RF transmitter d. Steel cage | b. Faraday cage |
| The gradient set can be activated to create a slope in the X, Y, and Z axes. True or False | True |
| What is the purpose of magnetic shielding? a. limit fringe field b. increase susceptibility c. enhance magnetic field d. increase fringe field | a. limit fringe field |
| types of magnets include all except: a. superconducting b. resistive c. secondary d. permanent | c. secondary |
| Homogeneity is the: a. evenness of the magnetic field b. unevenness of the magnetic field c. the fringe field d. gradient strength | a. evenness of the magnetic field |
| Homogeneity is measured in: a. msec b. gauss c. tesla d. PPM | d. PPM (parts per million) |
| The time it takes for gradients to reach their maximum amplitude. a. gradient amplitude b. gradient fall time c. gradient rise time d. slew rate | c. gradient rise time |
| The rapid switching of gradients can cause: a. heart palpitations b. extreme heat c. peripheral nerve stimulation d. frost bite | c. peripheral nerve stimulation |
| Phased array coils produce images with: a. equal SNR to volume coils b. improved SNR to volume coils c. degraded SNR to volume coils | b. improved SNR to volume coils |
| The requirements for MRI are: a. energy source b. suitable material c. magnet d. all the above | d. ALL the answers are correct |
| A primary advantage to using surface coils is: a. improve SNR b. decrease TE c. improve TR d. improve detail | a. improve SNR |
| Imaging systems that operate as low as 0.01 T are used for: a. extremity imaging b. spine imaging c. heart imaging d. brain imaging | a. extremity imaging |
| The primary purpose of the static magnetic field is to: a. move the protons to transverse plane b. magnetize the tissue c. release the magnetic field vector d. create a linear magnetic change | b. magnetize the tissue |
| The magnetic moment has vector properties which mean it has: a. size and direction b. atomic weight c. magnetic moment radiation d. spin | a. size and direction |
| Atoms with odd numbers are called: a. molecules b. radium c. isotope c. neutron | c. isotope |
| In MRI, the plane 90' to Bo is called: a. horizontal b. vertical c. longitudinal d. transverse | d. transverse |
| The field strength in Gauss of a 3T magnet: a. 3,000 b. 300 c. 30,000 d. 300,000 | c. 30,000 |
| What is the Larmor Frequency of an 8T magnet? a. 42.58 b. 63.86 c. 304.64 d. 340.64 | d. 340.64 |
| What band of the electromagnetic spectrum do MR frequencies fall into? a. RF b. visible c. ultraviolet d. infrared | a. RF |
| Inside the magnet are the shim coils, gradient coils and: a. NMV b. Faraday cage c. RF coils d. Passive shielding | c. RF coils |
| Angular momentum is the angle formed between a moving object and its imaginary axis. TRUE or FALSE | TRUE |
| An increase in Tesla will have a decrease in precessional frequency. TRUE or FALSE | FALSE |
| What creates the knocking noise heard during MR scans? a. shielding coils b. gradient coils c. shim coils d. RF coils | b. gradient coils |
| The wobble that protons make in resposne to the magnetic field is called: a. precession b. proton dephase c. angular phase d. net magnetic vector | a. precession |
| The transfer of energy from one object to another is called: a. precession b. suppression c. resonance d. angular momentum | c. resonance |
| The most abundant atom in the body is hydrogen and is found in: a. Protein b. fat c. water d. Both b and c | d. both b and c |
| The laws of electromagnetic induction refer to the forces of: a. magnetism b. charge c. motion d. all the above | d. ALL the above |
| To disturb the protons, the RF energy must match the precessional frequency of the patient's protons. TRUE or FALSE | TRUE |
| High thermal energy nuclei do not have enough energy to oppose the magnetic field. TRUE or FALSE | FALSE |
| The _____ is along or parallel the main magnetic field. a. spin down nuclei b. high energy nuclei c. spin up nuclei d. both a and b | c. spin up nuclei |
| The application of an RF pulse that causes resonance to occur is called: a. precession b. phase c. excitation d. frequency | c. excitation |
| The fundamentals of MRI can be explained by: a. classical and quantum mechanics b. thermal equilibrium and quantum mechanics c. quantum mechanics and the Larmor equation d. classical and thermal equilibrium | a. Classical and quantum mechanics |
| In order to get an AXIAL slice through the patient's head, the _____ gradient must be turned on. a. X b. Y c. Q d. Z | d. Z |
| MRI uses the H nucleus as it is abundant and contains one _____. a. atom b. nucleus c. photon d. proton | d. proton |
| Whcih gradient is used to create a sagittal slice? a. X b. Y c. Z | a. X |
| The relative balance between spin up and spindown nuclei is called: a. quantum mechanics b. magnetic moment c. electromagnetic induction d. net magnetization vector | d. Net magnetization vector |
| The components of Bo that extend beyond the magnet and its housing are called: a. frequency b. fringe field c. shim field d. resonance | b. fringe field |
| This is defined as how easily a substance can become magnetized. a. homogeneity b. phase coherence c. magnetic susceptibility d. gyromagnetic ratio | c. magnetic susceptibility |
| Diamagnetic materials are strongly attracted to the magnetic field. TRUE or FALSE | FALSE |
| The secondary magnetic field created by RF coil is called: a. Bo b. B1 c. B2 d. Z | b. B1 |
| The FDA limits for clinical imaging is 8T. TRUE or FALSE | FALSE |
| Shielding must limit the fringe field to _____ within the scan room. a. 5 T b. 5 G c. 0.5 G d. 0.05 T | b. 5 G |
| This system localizes the signal coming from the patient. a. Bo system b. Shim system c. RF system d. Gradient system | d. Gradient system |
Created by:
Larobbins