TY - JOUR
T1 - Automatic spatial calibration of freehand ultrasound probe with a multilayer N-wire phantom
AU - Wu, Chan
AU - Fu, Tianyu
AU - Chen, Xinyu
AU - Xiao, Jian
AU - Ai, Danni
AU - Fan, Jingfan
AU - Lin, Yucong
AU - Song, Hong
AU - Yang, Jian
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/2
Y1 - 2023/2
N2 - The classic N-wire phantom has been widely used in the calibration of freehand ultrasound probes. One of the main challenges of the phantom is accurately identifying N-fiducials in ultrasound images, especially with multiple N-wire structures. In this study, a method using a multilayer N-wire phantom for the automatic spatial calibration of ultrasound images is proposed. All dots in the ultrasound image are segmented, scored, and classified according to the unique geometric features of the multilayer N-wire phantom. A recognition method for identifying N-fiducials from the dots is proposed for calibrating the spatial transformation of the ultrasound probe. At depths of 9, 11, 13, and 15 cm, the reconstruction error of 50 points is 1.24 ± 0.16, 1.09 ± 0.06, 0.95 ± 0.08, 1.02 ± 0.05 mm, respectively. The reconstruction mockup test shows that the distance accuracy is 1.11 ± 0.82 mm at a depth of 15 cm.
AB - The classic N-wire phantom has been widely used in the calibration of freehand ultrasound probes. One of the main challenges of the phantom is accurately identifying N-fiducials in ultrasound images, especially with multiple N-wire structures. In this study, a method using a multilayer N-wire phantom for the automatic spatial calibration of ultrasound images is proposed. All dots in the ultrasound image are segmented, scored, and classified according to the unique geometric features of the multilayer N-wire phantom. A recognition method for identifying N-fiducials from the dots is proposed for calibrating the spatial transformation of the ultrasound probe. At depths of 9, 11, 13, and 15 cm, the reconstruction error of 50 points is 1.24 ± 0.16, 1.09 ± 0.06, 0.95 ± 0.08, 1.02 ± 0.05 mm, respectively. The reconstruction mockup test shows that the distance accuracy is 1.11 ± 0.82 mm at a depth of 15 cm.
KW - Calibration
KW - Multilayer
KW - N-wire phantom
KW - Ultrasound
UR - http://www.scopus.com/inward/record.url?scp=85140035838&partnerID=8YFLogxK
U2 - 10.1016/j.ultras.2022.106862
DO - 10.1016/j.ultras.2022.106862
M3 - Article
C2 - 36240539
AN - SCOPUS:85140035838
SN - 0041-624X
VL - 128
JO - Ultrasonics
JF - Ultrasonics
M1 - 106862
ER -