IMAGING CHARACTERISTICS OF A HIGH RESOLUTION CONE BEAM COLLIMATOR.
Single-photon-emission computed tomography (SPECT) using cone-beam geometry requires accurately built collimators and an appropriate reconstruction algorithm. The authors have investigated the imaging characteristics of a cast, high-resolution, cone-beam collimator and have compared its measured sensitivity and resolution with analytically predicted values. Using a filtered back-projection algorithm, they have measured point-spread functions at several locations within the field of view. Measurements have been made both with the collimator surface parallel to the axis-of-rotation (AOR) and with the surface tilted at an angle of 20 degree with respect to the AOR. Although the SPECT point-spread response is not completely shift-invariant, high-quality cone-beam images of a brain phantom have been obtained. The measured performance of the collimator agrees well with analytically derived results.
Jaszczak, RJ; Greer, KL; Floyd, CE; Manglos, SH; Coleman, RE
Ieee Transactions on Nuclear Science
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