title: Correction of probe pressure artifacts in freehand 3D ultrasound.
abstract: We present an algorithm which combines non-rigid image-based registration and conventional position sensing to correct probe-pressure-induced registration errors in freehand three-dimensional (3D) ultrasound volumes. The local accuracy of image-based registration enables the accurate freehand acquisition of high resolution (>15 MHz) 3D ultrasound data, opening the way for 3D musculoskeletal examinations. External position sensor readings guarantee the large-scale positional accuracy of the data. Pressure correction is shown to dramatically increase the perceived quality of extended-field-of-view data sets and reslices through volumetric data sets, while quantitative comparisons of multiple in vivo volumes demonstrate the superior precision of the corrected data.
authors.affiliation: Department of Engineering, Trumpington Street, Cambridge CB2 1PZ, UK. gmt11@eng.cam.ac.uk
authors.forename: G M
authors.initials: GM
authors.lastname: Treece
authors.forename: R W
authors.initials: RW
authors.lastname: Prager
authors.forename: A H
authors.initials: AH
authors.lastname: Gee
authors.forename: L
authors.initials: L
authors.lastname: Berman
mesh_terms: D000465:Algorithms; D016477:Artifacts; D017536:Carotid Artery, Common / Q000000981:diagnostic imaging; D005542:Forearm / Q000000981:diagnostic imaging; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007601:Jugular Veins / Q000000981:diagnostic imaging; D008099:Liver / Q000000981:diagnostic imaging; D008954:Models, Biological; D015233:Models, Statistical; D011312:Pressure; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013961:Thyroid Gland / Q000000981:diagnostic imaging; D014159:Transducers; D014463:Ultrasonography / Q000379:methods*; D001743:Urinary Bladder / Q000000981:diagnostic imaging