Alternative automatic alignment method for specimen tilt-series images based on back-projected volume data cross-correlations

Microscopy ◽  
2014 ◽  
Vol 63 (4) ◽  
pp. 279-294 ◽  
Author(s):  
Sachihiko Tomonaga ◽  
Misuzu Baba ◽  
Norio Baba
Keyword(s):  
Alignment Method ◽  
Volume Data ◽  
Automatic Alignment ◽  
Cross Correlations ◽  
Tilt Series

scholarly journals Percutaneous placement of lumbar pedicle screws via intraoperative CT image–based augmented reality–guided technology

2020 ◽  
Vol 32 (4) ◽  
pp. 542-547 ◽  
Author(s):  
Huan Liu ◽  
Junlong Wu ◽  
Yu Tang ◽  
Haiyin Li ◽  
Wenkai Wang ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Pedicle Screw ◽  
Pedicle Screws ◽  
Clinical Situation ◽  
Ct Image ◽  
Alignment Method ◽  
Intraoperative Ct ◽  
Screw Perforation ◽  
Automatic Alignment ◽  
Lumbar Pedicle

OBJECTIVEThe authors aimed to assess, in a bone-agar experimental setting, the feasibility and accuracy of percutaneous lumbar pedicle screw placements using an intraoperative CT image–based augmented reality (AR)–guided method compared to placements using a radiograph-guided method. They also compared two AR hologram alignment methods.METHODSTwelve lumbar spine sawbones were completely embedded in hardened opaque agar, and a cubic marker was fixed on each phantom. After intraoperative CT, a 3D model of each phantom was generated, and a specialized application was deployed into an AR headset (Microsoft HoloLens). One hundred twenty pedicle screws, simulated by Kirschner wires (K-wires), were placed by two experienced surgeons, who each placed a total of 60 screws: 20 placed with a radiograph-guided technique, 20 with an AR technique in which the hologram was manually aligned, and 20 with an AR technique in which the hologram was automatically aligned. For each K-wire, the insertion path was expanded to a 6.5-mm diameter to simulate a lumbar pedicle screw. CT imaging of each phantom was performed after all K-wire placements, and the operative time required for each K-wire placement was recorded. An independent radiologist rated all images of K-wire placements. Outcomes were classified as grade I (no pedicle perforation), grade II (screw perforation of the cortex by up to 2 mm), or grade III (screw perforation of the cortex by > 2 mm). In a clinical situation, placements scored as grade I or II would be acceptable and safe for patients.RESULTSAmong all screw placements, 75 (94%) of 80 AR-guided placements and 40 (100%) of 40 radiograph-guided placements were acceptable (i.e., grade I or II; p = 0.106). Radiograph-guided placements had more grade I outcomes than the AR-guided method (p < 0.0001). The accuracy of the two AR alignment methods (p = 0.526) was not statistically significantly different, and neither was it different between the AR and radiograph groups (p < 0.0001). AR-guided placements required less time than the radiograph-guided placements (mean ± standard deviation, 131.76 ± 24.57 vs 181.43 ± 15.82 seconds, p < 0.0001). Placements performed using the automatic-alignment method required less time than those using the manual-alignment method (124.20 ± 23.80 vs 139.33 ± 23.21 seconds, p = 0.0081).CONCLUSIONSIn bone-agar experimental settings, AR-guided percutaneous lumbar pedicle screw placements were acceptable and more efficient than radiograph-guided placements. In a comparison of the two AR-guided placements, the automatic-alignment method was as accurate as the manual method but more efficient. Because of some limitations, the AR-guided system cannot be recommended in a clinical setting until there is significant improvement of this technology.

Automatic alignment method and realization of space optical coupling

2018 ◽  
Vol 47 (1) ◽  
pp. 103009
Author(s):  
柯熙政 Ke Xizheng ◽  
罗静 Luo Jing ◽  
雷思琛 Lei Sichen
Keyword(s):  
Optical Coupling ◽  
Alignment Method ◽  
Automatic Alignment

Automatic Alignment Method Based on Sine Wave Magnetooptic Modulation in Spatial Wide-Angle Scale

2012 ◽  
Vol 39 (4) ◽  
pp. 0408002
Author(s):  
周召发 Zhou Zhaofa ◽  
杨志勇 Yang Zhiyong ◽  
张志利 Zhang Zhili
Keyword(s):  
Sine Wave ◽  
Wide Angle ◽  
Alignment Method ◽  
Automatic Alignment

Automatic alignment method for calibration of hydrometers

Metrologia ◽  
2004 ◽  
Vol 41 (2) ◽  
pp. S100-S104 ◽  
Author(s):  
Y J Lee ◽  
K H Chang ◽  
J C Chon ◽  
C Y Oh
Keyword(s):  
Alignment Method ◽  
Automatic Alignment

scholarly journals Analysis of spatial cross-correlations in multi-constituent volume data

2008 ◽  
Vol 232 (2) ◽  
pp. 282-292 ◽  
Author(s):  
A. RACK ◽  
L. HELFEN ◽  
T. BAUMBACH ◽  
S. KIRSTE ◽  
J. BANHART ◽  
...  
Keyword(s):  
Volume Data ◽  
Cross Correlations

A marker-free automatic alignment method based on scale-invariant features

2014 ◽  
Vol 186 (1) ◽  
pp. 167-180 ◽  
Author(s):  
Renmin Han ◽  
Fa Zhang ◽  
Xiaohua Wan ◽  
Jose-Jesus Fernández ◽  
Fei Sun ◽  
...  
Keyword(s):  
Alignment Method ◽  
Scale Invariant ◽  
Invariant Features ◽  
Automatic Alignment ◽  
Marker Free
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