Objective: Gamma camera nonuniformity can result in the presence of ring artifacts in
reconstructed SPECT images. The objective of this study is to compare the relationship …

It is generally recognized that single‐photon emission computed tomography (SPECT)
imposes very stringent requirements on gamma camera uniformity to prevent the occurrence …

SPECT produces nuclear medicine images using a 3-dimensional diagnostic tool that
eliminates the superimposition of adjacent structures, thus providing improved disease …

We investigated the spatial resolution and quantitative properties of SPECT images
reconstructed using filteredbackprojection (FB) and maximum likelihood-expectation …

Methods Resolution recovery was incorporated into ordered subsets expectation
maximization reconstruction algorithm. The first of the correction methods used a simple but …

Iterative reconstruction techniques such as an ordered subsets-expectation maximization
(OSEM) algorithm can easily incorporated various physical models of attenuation or scatter …

Purpose Low sensitivity can become a major problem when very small pinholes are used in
SPECT imaging. Although a larger pinhole aperture will improve the sensitivity, this will be at …

Purpose Evaluating gamma camera image quality is a routine task required for annual
physics surveys and laboratory accreditation. A common method is visual assessment of a …

Commercially available single photon emission computed tomography (SPECT) cameras
require both new calibration and very careful routine quality control procedures. These …

Defective detector blocks in PET may cause serious image artifacts. Toestimatetheinfluenceofmalfunctioningdet…
image quality, a method is described for transferringthe actual detector defect onto …