| Question 1: Which of the following is true, based on the Conference of Radiation Control Program Directors (CRCPD) Technical White Paper: Cone Beam Computed Tomography (CBCT) for Dental Applications?” |
| Reference: | CRCPD TECHNICAL WHITE PAPER: CONE BEAM COMPUTED TOMOGRAPHY (CBCT) FOR DENTAL APPLICATIONS, CRCPD Pub E-17-6. 2017
https://cdn.ymaws.com/www.crcpd.org/resource/collection/BF80D39C-1287-4A8F-8617-0253743905D8/E-17-6%20Technical%20White%20Paper%20-%20Cone%20Beam%20Compu.pdf |
| Choice A: | A Qualified Medical Physicist (QMP) or Qualified Expert (QE) should provide shielding recommendations for new installations as well as machine replacement installations |
| Choice B: | A Quality Assurance Program is only needed for Oral Surgery facilities |
| Choice C: | Acceptance testing should be conducted by a QMP or QE before the first patient is imaged on any new system installation |
| Choice D: | NCRP and CRCPD strongly encourage using CBCT systems to take intraoral images (“bitewings”) because they provide higher spatial resolution at lower dose than digital intraoral radiographic techniques |
| Question 2: Which is required about the annual medical physicist’s report, per the IAC CT Standards 2018? |
| Reference: | https://www.intersocietal.org/ct/standards/IACCTStandards2018.pdf |
| Choice A: | The report must be signed by the CT physician |
| Choice B: | Dose may be measured using CTDI, air kerma at the detector ka,i (FDD) or other method as determined by the medical physicist |
| Choice C: | Instrumentation used for dose measurement should be calibrated annually |
| Choice D: | None of the above |
| Question 3: What radiation dose metric is commonly reported following each exam by dental and maxillofacial CBCT systems? |
| Reference: | National Council on Radiation Protection and Measurements. Radiation Protection in Dentistry and Oral & Maxillofacial Imaging, NCRP Report No. 177 (National Council on Radiation Protection and Measurements, Bethesda, Maryland). 2019. |
| Choice A: | Entrance skin exposure |
| Choice B: | CTDIvol |
| Choice C: | CBDI |
| Choice D: | Dose-Area Product/Kerma-Area Product |
| Choice E: | Dose-Length Product |
| Question 4: Why is CTDIvol problematic for dental and maxillofacial CBCT dosimetry? |
| Reference: | Ref: “QUALITY CONTROL IN CONE-BEAM COMPUTED TOMOGRAPHY (CBCT) EFOMP-ESTRO-IAEA PROTOCOL” https://www.efomp.org/uploads/2017-06-02-CBCT_EFOMP-ESTRO-IAEA_protocol.pdf |
| Choice A: | For beam widths (heights) greater than about 40 mm, the CTDI100 measurement does not capture all primary and scatter radiation |
| Choice B: | Positioning CTDI phantoms can be difficult in CBCT systems intended for dental and maxillofacial imaging |
| Choice C: | Dental and maxillofacial CBCT systems do not employ helical scanning |
| Choice D: | Both (a) and (b) |
| Choice E: | Both (b) and (c) |
| Question 5: For dental and maxillofacial CBCT at acceptance evaluation, the contrast-to-noise ratio (CNR) should be tested: |
| Reference: | R Pauwels, H Stamatakis, G Manousaridis, A Walker, K Michielsen, H Bosmans et al, “Development and applicability of a quality control phantom for dental cone-beam CT,” J Appl Clin Med Phys. (2011) 12 (4), 3478 |
| Choice A: | Only for the most commonly used FOV and imaging protocol |
| Choice B: | Only in medium FOV and the most commonly programmed imaging protocol |
| Choice C: | In all FOVs (small, medium, large) and for all commonly programmed imaging protocols |
| Choice D: | In medium FOV and any one programmed imaging protocol |
| Choice E: | In all FOVs and for any one programmed imaging protocol. |
| Question 6: Pixel Value (PV) stability testing for dental CBCT should: |
| Reference: | "QUALITY CONTROL IN CONE-BEAM COMPUTED TOMOGRAPHY (CBCT) EFOMP-ESTRO-IAEA PROTOCOL” https://www.efomp.org/uploads/2017-06-02-CBCT_EFOMP-ESTRO-IAEA_protocol.pdf. |
| Choice A: | Comply with manufacturer’s provided tolerances |
| Choice B: | Comply with the State’s testing regulations |
| Choice C: | Be established baseline values and tolerances in SD, at the time of initial acceptance evaluation. |
| Choice D: | a and b |
| Choice E: | b and c |
