Mr. Xiaoguang Pan Profile

Xiaoguang Pan

at Philips and Neusoft Medical Systems Co Ltd

SPIE Involvement:

Author

Publications (3)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 30 October 2009 Paper

An automatic method for measurement of vertebral bone density based on QCT without an external reference phantom

Kai Zhao, Xiao-guang Pan, Yu-yue Zou, Yan Kang

Proceedings Volume 7497, 74972I (2009) https://doi.org/10.1117/12.830955

KEYWORDS: Image segmentation, Bone, Minerals, Calibration, Computed tomography, Spine, Statistical analysis, Medical imaging, Dual energy x-ray absorptiometry, Tissues

Read Abstract +

Purpose: We developed an automatic method for measurement of vertebral bone density based on QCT with the use of internal references(muscle and subcutaneous fat) instead of traditional external phantom. Methods: The automatic multistep approach starts with segmentation of periosteal and endosteal surfaces of spine to define ellipse ROI in cancellous bone followed by segmentation of muscle and subcutaneous fat in the spine image and a subsequent calculation of bone mineral density in ellipse ROI and segmentation trabecular and cortical bone ROI using muscle and subcutaneous fat as internal references. The segmentation approach used a hybrid region-growing method which used local adaptive threshold and morphological operation. Results: We conducted with-phantom and without-phantom measurements by using 94 clinical cases. The doctor manually defined the ellipse ROI in the with-phantom measurement. As for the without-phantom measurement, we use our method to automatically gain the BMD. The Interaclass Correlation Coefficient (ICC) is 0.93. We removed the points whose muscle and fat values are 2 times deviated from the standard deviation. And the calibrated ICC value is 0.999. Conclusion: The without-phantom measurement method is not fit for the patients whose muscle and fat are seriously deviated from the average value. The without-phantom measurement method proposed in this paper can automatically measure the BMD of spine. By accurately segmenting cortical bone and trabecular bone, determining ROI and removing inappropriate data, it is proved that the BMD measurement result by this method is highly consistent with that by with-phantom method.

Proceedings Article | 9 May 2000 Paper

Characteristics of limiting current-type oxygen sensor

Xiaoguang Pan, Qinghua Tang

Proceedings Volume 4077, (2000) https://doi.org/10.1117/12.385593

Read Abstract +

In this paper, a new of oxygen sensor using the electrochemical oxygen pump of ZrO₂-8Y₂O₃ zirconia electrolyte the artificial oxygen diffusion overpotential behavior has been investigated from the theoretical and practical viewpoints. The factors influencing the limiting current in the normal diffusion region. That is the oxygen molar fraction, gaseous diffusion coefficient, the temperature, the pressure, and the two geometric quantities (area and length). But the limiting current-type zirconia oxygen sensor shows an abnormal output in an exhaust gas at low excess air ratio. The influence of components of the exhaust gas and the mechanism of generation of the abnormal output are reported.

Proceedings Article | 9 May 2000 Paper

Effect on properties of 42Sn58Bi solder joint by adding the 96.5Sn3.5Ag

Qinghua Tang, Xiaoguang Pan, C. Wu, Y. Chan

Proceedings Volume 4077, (2000) https://doi.org/10.1117/12.385589

Read Abstract +

The different composition in 42Sn58Bi and 96.5Sn3.5Ag system has been studied. The reflow conditions of various composition pastes were studied, and a suitable adding of Sn-Ag paste could raise the soldering temperature of paste. It was found that the shear tensile strength of solder joint could be improved after adding suitable Sn-Ag to Sn-Bi paste by testing the solder joint tension. The thermal fatigue properties were studied through performed thermal annealing and thermal shocking. The shear tensile strength of solder joints for adding suitable Sn-Ag is higher than the pure Sn- Bi after thermal shocking. The solder property, mechanical and fatigue failure properties of solder joint for adding suitable Sn-Ag could be improved. It was found that suitable Sn-Ag could decrease the porosity in Sn-Bi solder joint thought X-ray and SEM analysis.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years