Marjorie Eguren1, Anderson Holguin2, Karla Diaz3, Jose Vidalon4, Carlos Linan5, Camila Pacheco-Pereira6, Manuel Oscar Lagravere Vich7. 1. Master in Orthodontic Graduate Program, Faculty of Stomatology, Universidad Peruana Cayetano Heredia, Lima, Perú. 2. Program of Orthodontics, Faculty of Stomatology, Universidad Peruana Cayetano Heredia, Lima, Perú. 3. Stomatology Second Specialty, Universidad Privada San Juan Bautista, Lima, Perú. 4. Department of Stomatology, Faculty of Stomatology, Universidad Peruana Cayetano Heredia, Lima, Perú. 5. Department of Orthodontics, Faculty of Stomatology, Universidad Peruana Cayetano Heredia, Lima, Perú. 6. University of Alberta, Faculty of Medicine and Dentistry, School of Dentistry, Dental Radiology, 11405-87 Ave, Edmonton, Canada. 7. University of Alberta, Faculty of Medicine and Dentistry, School of Dentistry, Orthodontic Graduate Program, ECHA 5-524, 11405-87 Ave, Edmonton, Canada.
Abstract
OBJECTIVES: The purpose of this systematic review was to answer the focus question: "Could the gray values (GVs) from CBCT (cone beam computed tomography) be converted to Hounsfield units (HUs) in multidetector computed tomography (MDCT)?" METHODS: The included studies try to answer the research question according to the PICO strategy. Studies were gathered by searching several electronic databases and partial grey literature up to January 2021 without language or time restrictions. The methodological assessment of the studies was performed using The Oral Health Assessment Tool (OHAT) for in vitro studies and the Quality Assessment of Diagnostic Accuracy Studies (QUADAS-2) for in vivo studies. The Grading of Recommendations Assessment, Development and Evaluation (GRADE system) instrument was applied to assess the level of evidence across the studies. RESULTS: 2710 articles were obtained in Phase 1, and 623 citations remained after removing duplicates. Only three studies were included in this review using a two-phase selection process and after applying the eligibility criteria. All studies were methodologically acceptable, although in general terms with low risks of bias. There are some included studies with quite low and limited evidence estimations and recommendation forces; evidencing the need for clinical studies with diagnostic capacity to support its use. CONCLUSIONS: This systematic review demonstrated that the GVs from CBCT cannot be converted to HUs due to the lack of clinical studies with diagnostic capacity to support its use. However, it is evidenced that three conversion steps (equipment calibration, prediction equation models, and a standard formula (converting GVs to HUs)) are needed to obtain pseudo Hounsfield values instead of only obtaining them from a regression or directly from the software.
OBJECTIVES: The purpose of this systematic review was to answer the focus question: "Could the gray values (GVs) from CBCT (cone beam computed tomography) be converted to Hounsfield units (HUs) in multidetector computed tomography (MDCT)?" METHODS: The included studies try to answer the research question according to the PICO strategy. Studies were gathered by searching several electronic databases and partial grey literature up to January 2021 without language or time restrictions. The methodological assessment of the studies was performed using The Oral Health Assessment Tool (OHAT) for in vitro studies and the Quality Assessment of Diagnostic Accuracy Studies (QUADAS-2) for in vivo studies. The Grading of Recommendations Assessment, Development and Evaluation (GRADE system) instrument was applied to assess the level of evidence across the studies. RESULTS: 2710 articles were obtained in Phase 1, and 623 citations remained after removing duplicates. Only three studies were included in this review using a two-phase selection process and after applying the eligibility criteria. All studies were methodologically acceptable, although in general terms with low risks of bias. There are some included studies with quite low and limited evidence estimations and recommendation forces; evidencing the need for clinical studies with diagnostic capacity to support its use. CONCLUSIONS: This systematic review demonstrated that the GVs from CBCT cannot be converted to HUs due to the lack of clinical studies with diagnostic capacity to support its use. However, it is evidenced that three conversion steps (equipment calibration, prediction equation models, and a standard formula (converting GVs to HUs)) are needed to obtain pseudo Hounsfield values instead of only obtaining them from a regression or directly from the software.
Authors: Masih Shahlaie; Bernard Gantes; Eloy Schulz; Matt Riggs; Max Crigger Journal: Int J Oral Maxillofac Implants Date: 2003 Mar-Apr Impact factor: 2.804
Authors: Tannaz Shapurian; Petros D Damoulis; Gary M Reiser; Terrence J Griffin; William M Rand Journal: Int J Oral Maxillofac Implants Date: 2006 Mar-Apr Impact factor: 2.804
Authors: Eliete N S Guerra; Fabiana T Almeida; Fernanda V Bezerra; Paulo T D S Figueiredo; Maria A G Silva; Graziela De Luca Canto; Camila Pachêco-Pereira; André F Leite Journal: Dentomaxillofac Radiol Date: 2017-07-03 Impact factor: 2.419
Authors: Holger J Schünemann; Reem A Mustafa; Jan Brozek; Karen R Steingart; Mariska Leeflang; Mohammad Hassan Murad; Patrick Bossuyt; Paul Glasziou; Roman Jaeschke; Stefan Lange; Joerg Meerpohl; Miranda Langendam; Monica Hultcrantz; Gunn E Vist; Elie A Akl; Mark Helfand; Nancy Santesso; Lotty Hooft; Rob Scholten; Måns Rosen; Anne Rutjes; Mark Crowther; Paola Muti; Heike Raatz; Mohammed T Ansari; John Williams; Regina Kunz; Jeff Harris; Ingrid Arévalo Rodriguez; Mikashmi Kohli; Gordon H Guyatt Journal: J Clin Epidemiol Date: 2020-02-12 Impact factor: 6.437
Authors: R Pauwels; O Nackaerts; N Bellaiche; H Stamatakis; K Tsiklakis; A Walker; H Bosmans; R Bogaerts; R Jacobs; K Horner Journal: Br J Radiol Date: 2013-01 Impact factor: 3.039
Authors: Małgorzata Solnik; Natalia Paduszyńska; Anna M Czarnecka; Kamil J Synoradzki; Yacoub A Yousef; Tomasz Chorągiewicz; Robert Rejdak; Mario Damiano Toro; Sandrine Zweifel; Katarzyna Dyndor; Michał Fiedorowicz Journal: Cancers (Basel) Date: 2022-06-27 Impact factor: 6.575