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In this paper, using Defrise Phantoms, we present our investigations of the axial limitations of an analytical cone-beam reconstruction algorithm (FDK), and the iterative ordered-subset transmission reconstruction (OSTR) iterative algorithm, for an axially extended version of the Philips Brightview XCT cone beam CT (CBCT) geometry. Simulations were preformed for head size and body size Defrise Phantoms...
Advanced single-photon emission computed tomography (SPECT) includes a cone-beam computed tomography (CBCT) unit for acquisition of anatomic information about the imaged subject. CT images obtained can be used for attenuation correction in SPECT and localization determination. Hardware considerations have led to the use of an imaging configuration in which the CBCT field of view (FOV) is extended...
In this paper we have modeled the spatially-varying resolution of a fan-beam collimator as a function of both distance and lateral position across the imaging plane within iterative reconstruction. We demonstrate that an incremental blurring technique can be used to more efficiently model such non-stationary resolution than the straightforward non-stationary convolution methodology with a gain of...
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