In computed tomography (CT) imaging, radiation dose delivered to the patient is one of the major concerns. Many CT
developers and researchers have been making efforts to reduce radiation dose. Sparse-view CT takes projections at
sparser view-angles and provides a viable option to reducing radiation dose. However, a fast power switching of an x-ray
tube, which is needed for the sparse-view sampling, can be challenging in many CT systems. We have recently proposed
a novel alternative approach to sparse-view circular CT that can be readily incorporated in the existing CT systems.
Instead of switching the x-ray tube power, we proposed to use a multi-slit collimator placed between the x-ray source
and the patient to partially block the x-ray beam thereby reducing the radiation. In this study, we performed a simulation
study based on numerically acquired projection data to demonstrate a feasibility of using a multi-slit collimator in a
helical CT. The XCAT phantom was used and a numerical collimator has been made to apply on the projection data.
Numerical multi-slit collimator was designed to have equal size of slit-openings and radio-opaque rectangular areas, and
the length dimension of the slits is perpendicular to the rotation axis. For image reconstruction, we used a total-variation
minimization (TV) algorithm which has shown its out-performance in many sparse-view CT applications. We
demonstrated that the proposed multiple fan-beam helical CT can provide a useful low-dose scanning option.
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.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
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.