Relevance of head motion in dental cone-beam CT scanner images depending on patient positioning

Marco Bontempi, Matteo Bettuzzi, Franco Casali, Alessandro Pasini, Alberto Rossi, Marilù Ariu

Research output: Contribution to journalArticlepeer-review


Objectives: The aim of this study is to investigate the effect of head motion on the reconstruction image quality in relation to patient positioning in dental cone-beam computed tomography (CBCT) systems. This study should be intended as the first step to evaluate the effect of the head movements also in more stringent conditions. Methods: Head motion was monitored using an EasyTrack-500 system in three acquisition conditions: lying down, sitting and standing. Motion was simulated on a cylinder used to calculate the modulation transfer function in order to quantify the resolution loss associated with it. Results and discussion: In none of the three acquisition layouts, head motion could be avoided. As expected head rotation angles are found to be smaller in the lying down configuration than in the sitting and standing ones. In the latter there is a probability of 30% of cases with high excursion rotation angles which would have a clearly perceptible lower image quality. Conclusion: Patient positioning during CBCT scanning can significantly influence occurrence of motion. This should be taken into account when very high image resolution is required in particular in patients that for age or clinical conditions may have difficulties in staying still.

Original languageEnglish
Pages (from-to)249-255
Number of pages7
JournalInternational journal of computer assisted radiology and surgery
Issue number3-4
Publication statusPublished - 2008


  • 3D
  • CBCT
  • Cone-beam
  • Head motion
  • Image quality
  • Image reconstruction
  • Maxillofacial radiology
  • Motion artefacts
  • MTF
  • X-ray computed tomography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Health Informatics
  • Surgery
  • Transplantation


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