| Question 1: True or false: ACR’s restructuring of accreditation programs for mammography, DBT, and breast MRI will result in lower fees when ACRedit Plus is implemented. |
| Reference: | https://www.acraccreditation.org/Coming-Soon accessed 04/27/2021 |
| Choice A: | True |
| Choice B: | False |
| Question 2: There will be three phantoms that can be used for image quality testing in the new manual, the old ACR phantom, the “mini” ACR phantom and the ACR DM QC phantom. What are the minimum pass criteria for the ACR DM QC Phantom in the 2018 DM QC manual? |
| Reference: | Reference: 2018 Digital Mammography QC Manual Medical Physicists Section, ACR Digital Mammography (DM) Phantom Image Quality, Performance Criteria and Corrective Actions p. 155 |
| Choice A: | 2 fibers, 2 speck groups, 2 masses |
| Choice B: | 2 fibers, 3 speck groups, 2 masses |
| Choice C: | 3 fibers, 3 speck groups, 3 masses |
| Choice D: | 2 fibers, 2 speck groups, 3 masses |
| Choice E: | 3 fibers, 2 speck groups, 2 masses |
| Question 3: The maximum allowable dose for a single scout view or tomosynthesis view will still be 3 mGy (300 mrad) as outlined in the 1999 QC manual. |
| Reference: | ACR Stereotactic Breast Biopsy Quality Control Manual 1999, Medical Physicists Section, Breast Entrance Exposure, Average Glandular Dose and Exposure Reproducibility, Recommended Performance Criteria and Corrective Action p.80 |
| Choice A: | True |
| Choice B: | False |
| Question 4: Which statement is true regarding Percent Image Uniformity (PIU) limits? |
| Reference: | Large and Medium Test Guidance for the ACR MRI Accreditation Program, available at https://www.acraccreditation.org/Modalities/MRI |
| Choice A: | For both phantoms, the ACR T1 and T2 series have different PIU limits. |
| Choice B: | The limit is lower for the Medium phantom than the Large phantom because uniformity is measured over a larger region. |
| Choice C: | The limit is higher for 3T due to the dielectric effect. |
| Choice D: | Application of uniformity/intensity correction to images acquired in phased array head coils is important to pass PIU limits. |
| Question 5: For both the Large and Medium phantoms, select the new total LCD score limits for 1.5T scanners. |
| Reference: | Large and Medium Test Guidance for the ACR MRI Accreditation Program, available at https://www.acraccreditation.org/Modalities/MRI |
| Choice A: | ACR T1 series ≥37 and ACR T2 series ≥37 |
| Choice B: | ACR T1 series ≥30 and ACR T2 series ≥25 |
| Choice C: | ACR T1 series ≥20 and ACR T2 series ≥20 |
| Choice D: | ACR T1 series ≥7 and ACR T2 series ≥7 |
| Question 6: What are the key features of image quality in CT? |
| Reference: | Samei E, Pfeiffer D (editors). Clinical Imaging Physics: Current and Emerging Practice. John Wiley & Sons, 2020. |
| Choice A: | Contrast, noise, and resolution |
| Choice B: | HU value and noise |
| Choice C: | Temporal resolution and pitch |
| Choice D: | Artifacts and noise |
| Question 7: Select the characteristic that primarily determines the detection of a lesion. |
| Reference: | Samei E, Peck D. Hendee’s Physics of Medical Imaging. 5th Edition, John Wiley & Sons, 2019. |
| Choice A: | Its contrast as stands against background contrast |
| Choice B: | Its edges as stand against spatial details in the background |
| Choice C: | Its spatial frequencies as they are distinct from those of the background |
| Choice D: | Its size compared to the magnitude of noise in the image |
| Question 8: Select the best definition of the detectability index. |
| Reference: | Zhang Y, Smitherman C, Samei E. Size specific optimization of CT protocols based on minimum detectability. Medical Physics 44 (4): 1301-1311, 2017.
Lacy T, Ding A, Minkemeyer V, Frush D, Samei E. Patient-based performance assessment for pediatric abdominal CT: an automated monitoring system based on lesion detectability and radiation dose. Academic Radiology 28: 217-224, 2021. |
| Choice A: | The accuracy in the detection of a lesion in the image |
| Choice B: | The likelihood that a lesion of known property might be detectable in an image |
| Choice C: | An index that reflects the detection of a feature from a phantom |
| Choice D: | The ability to see background features in an image distinct from one another |
| Question 9: Select from the following what an ideal imaging practice would offer. |
| Reference: | Frush DP, Samei E. CT Radiation dose monitoring: current state and new prospects. Medscape Radiology, March 2015. |
| Choice A: | Consistent radiation dose across patients of similar indication |
| Choice B: | Consistent image quality across patients of similar indication |
| Choice C: | Higher image quality for sicker patients |
| Choice D: | Lower radiation dose for sicker patients |
| Question 10: Compared to fixed current, tube current modulation in CT |
| Reference: | Samei E, Pelc N (editors). Advances in CT: Technologies, Applications, Operation. Springer International Publishing AG, Cham, Switzerland, 2020. |
| Choice A: | makes noise from slice to slice more uniform |
| Choice B: | makes noise across CT slices constant |
| Choice C: | reduces dose to smaller patients |
| Choice D: | makes dose across organs more uniform |
