Refraction corrected transmission ultrasound computed tomography for application in breast imaging.
OBJECTIVE
We present an iterative framework for CT reconstruction from transmission ultrasound data which accurately and efficiently models the strong refraction effects that occur in our target application: Imaging the female breast.


METHODS
Our refractive ray tracing framework has its foundation in the fast marching method (FNMM) and it allows an accurate as well as efficient modeling of curved rays. We also describe a novel regularization scheme that yields further significant reconstruction quality improvements. A final contribution is the development of a realistic anthropomorphic digital breast phantom based on the NIH Visible Female data set.


RESULTS
Our system is able to resolve very fine details even in the presence of significant noise, and it reconstructs both sound speed and attenuation data. Excellent correspondence with a traditional, but significantly more computationally expensive wave equation solver is achieved.


CONCLUSIONS
Apart from the accurate modeling of curved rays, decisive factors have also been our regularization scheme and the high-quality interpolation filter we have used. An added benefit of our framework is that it accelerates well on GPUs where we have shown that clinical 3D reconstruction speeds on the order of minutes are possible.
Li
Shengying
S
Department of Computer Science, Stony Brook University, Stony Brook, New York 11794-4400, USA.
Jackowski
Marcel
M
Dione
Donald P
DP
Varslot
Trond
T
Staib
Lawrence H
LH
Mueller
Klaus
K
D000465:Algorithms; D000818:Animals; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional; D019047:Phantoms, Imaging; D013997:Time Factors; D014054:Tomography / Q000379:methods*; D016217:Ultrasonography, Mammary / Q000379:methods*