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Journal of Medical Imaging

Implementation and CT sampling characterization of a third-generation SPECT–CT system for dedicated breast imaging
Author(s): Jainil P. Shah; Steve D. Mann; Randolph L. McKinley; Martin P. Tornai
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Paper Abstract

Stand-alone cone beam computed tomography (CT) and single-photon emission computed tomography (SPECT) systems capable of complex acquisition trajectories have previously been developed for breast imaging. Fully three-dimensional (3-D) motions of SPECT systems provide views into the chest wall and throughout the entire volume. The polar tilting capability of the CBCT system has shown improvement in sampling close to the chest wall, while eliminating cone beam artifacts. Here, a single hybrid SPECT–CT system, with each individual modality capable of independently traversing complex trajectories around a common pendant breast volume, was developed. We present the practical implementation of this design and preliminary results of the CT system. The fully 3-D SPECT was nested inside the suspended CT gantry and oriented perpendicular to the CT source–detector pair. Both subsystems were positioned on a rotation stage, with the combined polar and azimuthal motions enabling spherical trajectories. Six trajectories were used for initial evaluation of the tilt capable CT system. The developed system can achieve polar tilt angles with a <0.02-deg positioning error and no hysteresis. Initial imaging results demonstrate that additional off-axis projection views of various geometric resolution phantoms facilitate more complete sampling, more consistent attenuation value recovery, and markedly improved reconstructions. This system could have various applications in diagnostic or therapeutic breast imaging.

Paper Details

Date Published: 31 July 2017
PDF: 11 pages
J. Med. Imag. 4(3) 033502 doi: 10.1117/1.JMI.4.3.033502
Published in: Journal of Medical Imaging Volume 4, Issue 3
Show Author Affiliations
Jainil P. Shah, Duke Univ. (United States)
Duke Univ. Medical Ctr. (United States)
Steve D. Mann, Duke Univ. (United States)
Duke Univ. Medical Ctr. (United States)
Randolph L. McKinley, ZumaTek, Inc. (United States)
Martin P. Tornai, Duke Univ. Medical Ctr. (United States)
Duke Univ. (United States)


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