Mr. Zehao Li Profile

Zehao Li

at University of Southern California

SPIE Involvement:

Author

Publications (1)

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 | 19 March 2019 Presentation + Paper

Investigation of Pockels effect in optical property modulation-based radiation detection method for positron emission tomography

Yuli Wang, Zehao Li, Jianfeng Xu

Proceedings Volume 10953, 1095306 (2019) https://doi.org/10.1117/12.2512015

KEYWORDS: Crystals, Modulation, Sensors, Semiconductor lasers, Ionizing radiation, Photons, Signal detection, Positron emission tomography, Laser crystals, Optical properties

Read Abstract +

A new method for the detection of ionizing radiation with the potential to improve the coincidence time resolution in positron emission tomography (PET) was investigated. This method is based on Pockels effect (i.e., linear electro-optic modulation effect) and pump-probe measurement with cadmium telluride (CdTe) and lithium niobate (LiNbO₃). In this work, the performance of the two detector materials were compared experimentally. CdTe detector material demonstrated a repeatable change in modulation signal level after laser diode illumination, while LiNbO₃ crystal gave no response to laser diode as the radiation source, suggesting the shorter carrier lifetime and lower carrier mobility found of LiNbO₃ material. The modulation signal induced by 511 KeV photons in LiNbO₃ and CdTe both can be detected through the new method. We found that the CdTe crystal could provide a higher sensitivity to 511 KeV photons than the LiNbO₃ crystal under the same bias voltage. In addition, the amplitude of modulation signal increased linearly with the bias voltage before saturation. The modulation signal strength in LiNbO₃ crystal was continued to increase after 2200 V due to its high resistivity which could reduce the dark current in detector and thus reduce the noise level during experiment, while the modulation signal of CdTe with low resistivity tended to be saturated at the bias voltage of higher than 1400 V. Therefore, further increasing the bias voltage for both detector crystals may hypothetically enhance the modulation strength and detection sensitivity of PET.

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