6533b854fe1ef96bd12aec18

RESEARCH PRODUCT

Automated detection of patient movement during a CBCT scan based on the projection data.

Michel MichelRalf SchulzeUlrich Schwanecke

subject

Cone beam computed tomographyComputer scienceMovementOptical flowVideo RecordingSensitivity and SpecificityPathology and Forensic MedicineAccelerationSoftwareImaging Three-DimensionalHumansRadiology Nuclear Medicine and imagingDentistry (miscellaneous)Computer visionSensitivity (control systems)Projection (set theory)Pixelbusiness.industryPhantoms ImagingFrame (networking)Cone-Beam Computed TomographyFeasibility StudiesRadiographic Image Interpretation Computer-AssistedSurgeryArtificial intelligenceOral SurgerybusinessArtifactsAlgorithmsSoftware

description

Objectives To develop an automated procedure to detect patient motion on the projection images acquired during a cone beam computed tomography (CBCT) scan and to evaluate the method's feasibility on small real-world CBCT images in relation to visual assessment. Methods Based on optical flow theory, software was developed using the sequence of the projection images of a CBCT machine for automated detection of patient motion. Averaged acceleration vectors were used as measurement data and compared with visual assessment of the projection images displayed as video. Seventy-nine CBCT data sets (small field-of-view: 40 mm) from our patient database were selected in a sequential fashion and evaluated with the software. Results 10 out of 79 (13%) were allocated to a patient movement. A threshold of 0.4 pixel/frame transition was empirically determined as indicating motion by visual assessment of the image sequence. Relative to this standard of reference, the software reached 80% sensitivity versus 67% specificity. Conclusions Optical flow seems to be an efficient concept for automated detection of patient motion on the projection images acquired during a CBCT scan.

yearjournalcountryeditionlanguage
2015-04-01Oral surgery, oral medicine, oral pathology and oral radiology
10.1016/j.oooo.2014.12.008https://pubmed.ncbi.nlm.nih.gov/25660275