Improvement of the visibility for x-ray phase contrast imaging using photon counting detector

S. Sano; K. Tanabe; T. Yoshimuta; K. Kimura; T. Shirai; T. Doki; A. Horiba; T. Sato

doi:10.1117/12.2216679

31 March 2016 Improvement of the visibility for x-ray phase contrast imaging using photon counting detector

S. Sano, K. Tanabe, T. Yoshimuta, K. Kimura, T. Shirai, T. Doki, A. Horiba, T. Sato

Proceedings Volume 9783, Medical Imaging 2016: Physics of Medical Imaging; 97835I (2016) https://doi.org/10.1117/12.2216679
Event: SPIE Medical Imaging, 2016, San Diego, California, United States

Abstract

In the case of employing Talbot interferometer to the medical imaging, a practical X-ray tube should be combined with the interferometer. Practical x-ray tubes radiate continuous X-rays and the interference intensity (so-called visibility) becomes worse because of the wide spectrum of continuous X-rays. In order to achieve high visibility, we have estimated the visibility improvement effect using the photon counting detector (PCD). The detected spectra using a 2D imaging PCD are distorted due to charge sharing and pileup, which would make visibility worse. First, we have made a model for Monte-Calro calculation to calculate the distorted spectra and point spread function (PSF) for the charge sharing. The calculation model is based on the summation of the monochromatic response function which is the detected charge on the interested pixel for one photon injection. Distortion of spectra was calculated taking into account the charge sharing effect and pulse pileup. Then we have obtained an estimation result of the visibility improvement effect using the PCD of CdTe. The visibilities of the energy integrating detector (EID) of CdTe and the PCD are calculated and compared, where the Talbot interferometer type is a fringe scanning using phase grating and absorption grating. Visibility of the EID is 36% and that of PCD is 60% without pileup effect. In high dose rate condition, the CNR decreasing ratio is remarkable. The visibility decreasing effect and quantum noise increasing effect are correlated and the both effect worsen the CNR.

Citation Download Citation

S. Sano, K. Tanabe, T. Yoshimuta, K. Kimura, T. Shirai, T. Doki, A. Horiba, and T. Sato "Improvement of the visibility for x-ray phase contrast imaging using photon counting detector", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97835I (31 March 2016); https://doi.org/10.1117/12.2216679

ACCESS THE FULL ARTICLE

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: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Visibility

Sensors

X-rays

Interferometers

Photon counting

X-ray imaging

Phase contrast

Show All Keywords

Keywords/Phrases

Search In:

Publication Years