Novel CT detector based on an inorganic scintillator working in photon-counting mode

Philippe Bérard; Joël Riendeau; Catherine M. Pepin; Daniel Rouleau; Jules Cadorette; Réjean Fontaine; Roger Lecomte

doi:10.1117/12.654541

2 March 2006 Novel CT detector based on an inorganic scintillator working in photon-counting mode

Philippe Bérard, Joël Riendeau, Catherine M. Pepin, Daniel Rouleau, Jules Cadorette, Réjean Fontaine, Roger Lecomte

Proceedings Volume 6142, Medical Imaging 2006: Physics of Medical Imaging; 61420V (2006) https://doi.org/10.1117/12.654541
Event: Medical Imaging, 2006, San Diego, California, United States

Abstract

Detectors working in photon counting mode offer an interesting alternative to the common charge integrating detectors for computed tomography (CT), because they can potentially measure the energy of every detected X-ray photons and achieve better image contrast sensitivity for a given dose. Unfortunately, most current X-ray detectors suffer from limited count rate capability, due either to a long charge migration time in semiconductor and gas detectors, or to a slow decay time in ceramic scintillators. To overcome these difficulties, we propose to use pixel detectors based on fast light emitting inorganic scintillators individually coupled to avalanche photodiodes with parallel, low-noise, fast digital processing electronics to provide real time single event detection and recording. The proposed detector was investigated with 2 × 2 × 10 mm³ Lu_1.9Y_0.1SiO₅ (LYSO), a fast decay time (40 ns), heavy (7.19 g/cc) scintillator that is also suitable for coincidence detection of annihilation radiation (511 keV) in positron emission tomography (PET). Therefore, the detector characteristics make it a good candidate for implementation in a combined PET/CT dual-modality scanner. Although only coarse spectral analysis is possible in the X-ray energy range, it is demonstrated that appropriate CT images for anatomical localization can be obtained at very low dose in counting mode using a PET/CT simulator set up for small animal imaging. Data are reported on CT image resolution, noise, contrast and dose.

Citation Download Citation

Philippe Bérard, Joël Riendeau, Catherine M. Pepin, Daniel Rouleau, Jules Cadorette, Réjean Fontaine, and Roger Lecomte "Novel CT detector based on an inorganic scintillator working in photon-counting mode", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61420V (2 March 2006); https://doi.org/10.1117/12.654541

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