| 1. |
- de Las Heras Gala, Hugo, et al.
(författare)
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Quality control in cone-beam computed tomography (CBCT): EFOMP-ESTRO-IAEA protocol
- 2017
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Rapport (refereegranskat)abstract
- Quality control of cone-beam computed tomography (CBCT) systems is an essential part of quality assurance to periodically check that quality requirements are met, reduce uncertainties and errors and reduce the likelihood of accidents and incidents. Radiation exposure levels must be measured to ensure that patient doses associated with CBCT examinations are kept as low as reasonably achievable consistent with the required diagnostic information. The main purpose of this document is to present procedures for quality control of CBCT systems used for dental, radiotherapy, interventional radiology and guided surgery applications.
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| 2. |
- de Las Heras Gala, Hugo, et al.
(författare)
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Quality control in cone-beam computed tomography (CBCT) EFOMP-ESTRO-IAEA protocol (summary report)
- 2017
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Ingår i: Physica medica (Testo stampato). - : Elsevier BV. - 1120-1797 .- 1724-191X. ; 39, s. 67-72
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Tidskriftsartikel (refereegranskat)abstract
- The aim of the guideline presented in this article is to unify the test parameters for image quality evaluation and radiation output in all types of cone-beam computed tomography (CBCT) systems. The applications of CBCT spread over dental and interventional radiology, guided surgery and radiotherapy. The chosen tests provide the means to objectively evaluate the performance and monitor the constancy of the imaging chain. Experience from all involved associations has been collected to achieve a consensus that is rigorous and helpful for the practice. The guideline recommends to assess image quality in terms of uniformity, geometrical precision, voxel density values (or Hounsfield units where available), noise, low contrast resolution and spatial resolution measurements. These tests usually require the use of a phantom and evaluation software. Radiation output can be determined with a kerma-area product meter attached to the tube case. Alternatively, a solid state dosimeter attached to the flat panel and a simple geometric relationship can be used to calculate the dose to the isocentre. Summary tables including action levels and recommended frequencies for each test, as well as relevant references, are provided. If the radiation output or image quality deviates from expected values, or exceeds documented action levels for a given system, a more in depth system analysis (using conventional tests) and corrective maintenance work may be required.
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| 3. |
- de las Heras, Hugo, et al.
(författare)
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Quality control for cone beam CT devices: The EFOMP guidelines for assessing image quality and dose
- 2016
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Ingår i: ECR 2016.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Learning objectives: Learn about an objective, practical and unifying methodology for quality control of all cone beam CT (CBCT) modalities. Understand the choice and justification of the proposed tests Learn how to perform the tests on a routine basis.Background: Current guidelines for quality control of CBCT devices consider the available applications (dental, radiotherapy, interventional radiology and guided surgery) as different entities [1], [2]. However, the data acquisition and reconstruction methods are similar. Henceforth, the evaluation parameters for image quality and dose can be unified.Findings and procedure details: The parameters used for image quality assessment are uniformity, accuracy of density values (or Hounsfield units where appropriate), geometrical evaluation, noise, low-contrast resolution (including contrast-to-noise ratio) and high-contrast resolution. Detailed procedures using free software and commercially available test phantoms are described in the guidelines, which are currently under external review.Conclusion: These guidelines include the minimum tests that should be performed to ensure reliable, safe and consistent performance of CBCT devices. This minimum has been sought to guarantee compatibility with all manufacturers, all cone beam modalities and existing national and international documents.
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