| Question 1: Of all of the magnetic field homogeneity measuring methodologies reviewed in this talk, which one does not use an image product(s) to determine homogeneity? |
| Reference: | is a SNR-test method. Both a) and b) require images.
Reference: 2015 ACR MRI QC Manual
|
| Choice A: | Phase-Map Method. |
| Choice B: | Spectral FWHM Method. |
| Choice C: | Single-Image Method. |
| Choice D: | Bandwidth-Difference Method. |
| Question 2: One advantage of the image difference method to single-image methods of measuring SNR for a coil is: |
| Reference: | NEMA MS 1-2008: Determination of Signal-to-Noise Ratio in Diagnostic Magnetic Resonance Images
|
| Choice A: | You acquire a “noise” image directly by turning off the RF transmitter. |
| Choice B: | Many scanners have a system tool that performs the image difference method automatically. |
| Choice C: | The image-difference method is reasonably faster. |
| Choice D: | one can assess image noise directly in the phantom region instead of the background. |
| Question 3: One advantage of the single-image methods of measuring SNR for a coil is:
|
| Reference: | NEMA MS 1-2008: Determination of Signal-to-Noise Ratio in Diagnostic Magnetic Resonance Images |
| Choice A: | One only needs to acquire a single image before making measurements. |
| Choice B: | Uniformity tends to be higher in the image. |
| Choice C: | One can choose any part of the background to make the noise measurement. |
| Choice D: | SNR measurements are more accurate by a factor of 1/√2. |
| Question 4: Since the last annual renewal, a new coil has been purchased for scanning wrists that was not available in the previous year. What should the physicist do at the next annual renewal?
|
| Reference: | 2015 ACR MRI QC Manual |
| Choice A: | Call the ACR office and notify them of a new coil in use. |
| Choice B: | Note the purchase of a new coil in the annual report and conduct appropriate SNR testing. |
| Choice C: | Write a new policy associated with coil usage and include a summary in the report. |
| Choice D: | Let the system engineer handle the details. |
| Question 5: As noted in the annual performance assessment document, the physicist is not in charge of performing..
|
| Reference: | 2015 ACR MRI QC Manual
|
| Choice A: | Evaluation for artifacts of images acquired using the ACR protocol. |
| Choice B: | Evaluation of the weekly site Tech QC program. |
| Choice C: | Table position accuracy tests. |
| Choice D: | Weekly center frequency tests. |
| Question 6: Coil testing #2: When testing coil arrays, what is the recommendation of the ACR 2015 MRI QC manual? |
| Reference: | 2015 ACR MRI QC Manual |
| Choice A: | Coil arrays are exempt from SNR testing. |
| Choice B: | Images from each coil element should be evaluated individually. |
| Choice C: | Clinical image uniformity is more important than individual element performance. |
| Choice D: | SNR testing of each single element should proceed exactly as per testing of volume coils. |
