High contrast imaging and fast imaging reconstruction

摘要

When reconstructing low-collimation nuclear scan data (18) (e.g., SPECT) into a nuclear image volume (19), a spatial frequency-dependent (SFD) filter function is applied in Fourier space to the reconstructed image (19) to improve image resolution given a predefined number of reconstruction iterations and/or to reduce the number of reconstruction iterations required to achieve a predetermined level of image resolution. Size of an object to be imaged is determined, and the SFD filter function is determined or generated based on signal power spectrum (and/or modulated transfer function) data, object size, and desired image quality (or number of reconstruction iterations). The SFD filter function amplifies higher-energy components (e.g., corresponding to a lesion or tumor, or the like) of the spatial frequency spectrum to improve viability in a low collimated nuclear image (19) using fewer reconstruction iterations.

主权项

1. A nuclear image optimization system, including:
a nuclear scanner that acquires nuclear scan data of a volume of interest (VOI), and having one or more collimators that provide a low level of collimation during nuclear scan data acquisition; an object size detector including a processor configured to determine a size of the VOI; a filter function library having a lookup table that identifies one or more object size-dependent filter functions for each of a plurality of object sizes; and a processor that performs an iterative reconstruction algorithm, executes the object size-dependent filter function after executing a predetermined number of reconstruction algorithm iterations, and outputs an enhanced nuclear image volume representation.