[Measurement study of MDCT 3D reconstruction and microanatomy related to individual piston shaping on malleostapedotomy].
OBJECTIVE
To study the management of basic parameters related to individual piston shaping on malleostapedotomy by MDST 3D reconstruction and microanatomy and to assess the accuracy of MDST method.


METHODS
Ten Chinese temporal bones without ear diseases were numbered randomly and scanned by GE Light Speed Ultra 64 rows of spiral CT. 3D structure of ossicular chain were reconstructed by MPR and VR methods in AW4. 1 workstation. Then measurements of distances between stapes head to stapes footplate (A line), and manubrium to stapes head (B line), and manubrium to stapes footplate (C line), angle between line A and line B (angle AB) are completed. After that, all samples of temporal bone were undergone canal wall down mastoidectomy under microscope and the relevant measurements were completed.


RESULTS
The MPR and VR technique of MDCT reconstructed ossicular chain clearly, and revealed the spatial relationship between every structure stereoscopically. Respectively, lengths of A, B, C line by MDST and microanatomy are (3.42 +/- 0.86) mm and (3.60 +/- 0.94) mm, (3.42 +/- 0.80) mm and (2.96 +/- 0.42) mm, (5.86 +/- 0.60) mm and (6.22 +/- 1.10) mm, while angle AB (141.05 +/- 30.07) degrees and (144.57 +/- 41.86) degrees. There are no statistically significant differences between two groups (P>0.05).


CONCLUSIONS
The MPR and VR technique of MDCT can clearly reconstructed the 3D shapes of the temporal bone and finish the exactly managements on A, B, C lines and AB angel which is crucial for shaping a individual piston on malleus-to-oval window surgery.
Department of Otorhinolaryngology Head and Neck Surgery, Guangdong Provincial People's Hospital, Guangzhou, 510080, China.
Runmei
R
Ge
Peina
P
Wu
Hui
H
Liu
Yong
Y
Cui
Mimi
M
Xu
Xiaoqian
X
Wang
Min
M
Fu
Liangsi
L
Chen
D000328:Adult; D004432:Ear, Middle / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008297:Male; D008307:Malleus / Q000033:anatomy & histology / Q000601:surgery*; D013199:Stapes / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D013701:Temporal Bone / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D036542:Tomography, Spiral Computed