Rubens Spin-Neto

Patient movement characteristics and the impact on CBCT image quality and interpretability

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

  • Rubens Spin-Neto
  • Cláudio Costa, 2 Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
  • ,
  • Daniela Mra Salgado, 2 Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
  • ,
  • Nataly Rm Zambrana, 2 Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
  • ,
  • Erik Gotfredsen
  • ,
  • Ann Wenzel

OBJECTIVES: To assess the impact of patient movement characteristics and metal/radiopaque materials in the field-of-view (FOV) on CBCT image quality and interpretability.

METHODS: 162 CBCT examinations were performed in 134 consecutive (i.e. prospective data collection) patients (age average: 27.2 years; range: 9-73). An accelerometer-gyroscope system registered patient's head position during examination. The threshold for movement definition was set at ≥0.5-mm movement distance based on accelerometer-gyroscope recording. Movement complexity was defined as uniplanar/multiplanar. Three observers scored independently: presence of stripe (i.e. streak) artefacts (absent/"enamel stripes"/"metal stripes"/"movement stripes"), overall unsharpness (absent/present) and image interpretability (interpretable/not interpretable). Kappa statistics assessed interobserver agreement. χ(2) tests analysed whether movement distance, movement complexity and metal/radiopaque material in the FOV affected image quality and image interpretability. Relevant risk factors (p ≤ 0.20) were entered into a multivariate logistic regression analysis with "not interpretable" as the outcome.

RESULTS: Interobserver agreement for image interpretability was good (average = 0.65). Movement distance and presence of metal/radiopaque materials significantly affected image quality and interpretability. There were 22-28 cases, in which the observers stated the image was not interpretable. Small movements (i.e. <3 mm) did not significantly affect image interpretability. For movements ≥ 3 mm, the risk that a case was scored as "not interpretable" was significantly (p ≤ 0.05) increased (OR 3.2-11.3; 95% CI [0.70-65.47]). Metal/radiopaque material was also a significant (p ≤ 0.05) risk factor (OR 3.61-5.05).

CONCLUSIONS: Patient movement ≥3 mm and metal/radiopaque material in the FOV significantly affected CBCT image quality and interpretability.

OriginalsprogEngelsk
TidsskriftDentomaxillofacial Radiology
Vol/bind47
Nummer1
Sider (fra-til)20170216
ISSN0250-832X
DOI
StatusUdgivet - 2018

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