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Evaluation of Phantoms Used in Image Quality Performance Testing of Dental Cone Beam Computed Tomography Systems

Alahmad, Haitham N
http://orcid.org/0000-0001-5706-3641
http://rave.ohiolink.edu/etdc/view?acc_num=mco1438985667

Abstract Details

2015, Master of Science in Biomedical Sciences (MSBS), University of Toledo, Biomedical Sciences (Diagnostic Radiology).
Cone beam computed tomography (CBCT) units dedicated for dental and maxillofacial imaging have gained widespread use in recent years. So far there are no standardized testing methods to evaluate the image quality or the dose on these units. Although the vendors commonly provide an image quality phantom with the machine, the procedures, image quality parameters evaluated, and performance criteria are limited and specific to the vendors. The goal of this study is to evaluate the available phantoms as a testing tool for image quality assessment of dental CBCT units. In addition, the optimal diameter and features of a QA phantom for dental CBCT testing was assessed. Two commercially available phantoms were evaluated to assess the adequacy of each for use in the standardized testing procedures. These included ACR CT phantom (Gammex 464) and CATPHAN (Phantom Laboratory). Additionally, a prototype dental CT phantom (CIRS Inc.) was evaluated. Scans were made on three different machines; i-CAT Classic (Imaging Sciences International), ILUMA (IMTEC/3M) and GALILEOS Comfort (Sirona). A CT scan of the three phantoms were also performed with a conventional CT scanner (Toshiba Aquilion 16) to verify the pixel values. The image quality parameters that were evaluated included: image noise, image uniformity, pixel value accuracy, pixel value linearity, contrast scale, and high contrast spatial resolution. There is not one phantom evaluated that provided superior results for all image quality tests. The prototype phantom was adequate for all tests with the exception of the high contrast resolution test whereas the ACR phantom and the CATPHAN due to larger diameter relative to the prototype demonstrated higher noise and non-uniformity, pixel value inaccuracy, and lower contrast scale because of more beam hardening artifact occurring with the large diameter. The optimal diameter for a phantom specialized in dental CBCT testing was found to be between 16 and 17 cm in diameter.
Krugh Kerry (Committee Member)
E. Ishmael Parsai (Committee Chair)
Diana Shvydka (Committee Member)
71 p.
Medical Imaging; Radiation
Dental CBCT, Cone beam CT, Image Quality Testing,Computed Tomography

Recommended Citations

Citations

  • Alahmad, H. N. (2015). Evaluation of Phantoms Used in Image Quality Performance Testing of Dental Cone Beam Computed Tomography Systems [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=mco1438985667

    APA Style (7th edition)

  • Alahmad, Haitham. Evaluation of Phantoms Used in Image Quality Performance Testing of Dental Cone Beam Computed Tomography Systems . 2015. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=mco1438985667.

    MLA Style (8th edition)

  • Alahmad, Haitham. "Evaluation of Phantoms Used in Image Quality Performance Testing of Dental Cone Beam Computed Tomography Systems ." Master's thesis, University of Toledo, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=mco1438985667

    Chicago Manual of Style (17th edition)

mco1438985667
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This open access ETD is published by University of Toledo Health Science Campus and OhioLINK.