Design and evaluation of the MAMMI dedicated breast PET
Detector ring. (Left) Photograph of the MAMMI detector ring. (Right) Schematic of the ring showing the 186 mm detector geometric aperture and the 170 mm transaxial FOV.
Photo of the MAMMI cart with the detector ring inserted into the special hanging breast device.
Sketches of the (a) AC-Phantom I and (b) AC-Phantom II (all units are in mm).
Linear source phantoms used for the sensitivity determination.
NEC phantom (all units are in mm).
(a) and (b) Reconstructed images of AC-Phantoms I and II after 12 MLEM iterations considering the AC.
Percent contrast (in %) dependence on the number of iterations (AC-Phantoms I and II) (a) and (b).
Background variability (in %) dependence on the number of iterations. (a) BV of AC-Phantom I calculated without considering those ROIs influenced by the inserts. (b) The BV of AC-Phantom II calculated considering all 60 ROIs.
MAMMI FWHM spatial resolution without DOI information at several radial positions. (a) at the axial FOV center and (b) at 1/4 of the axial FOV.
Variation of the FWHM of a point-like source placed in the center of the FOV.
(a) MAMMI absolute slice sensitivity obtained with a 22Na point-like source. (b) MAMMI average sensitivity percentage per slice obtained with a 18F line source.
Total, trues, random, scattered, and NEC count rate for the (250 keV–750 keV) energy window as a function of the activity in the NEC phantom detailed in Fig. 5.
Percent contrasts (in %) obtained with AC-Phantom I after 12 and 50 MLEM iterations.
Percent contrasts (in %) obtained with AC-Phantom II after 12 and 50 MLEM iterations.
Performance parameters of some recent reported dedicated breast PET scanners and comparison with the WB-PET GE Discovery 600.
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