Evaluation of a matched filter resolution recovery reconstruction algorithm for SPECT-CT imaging.

Abstract:

AIM:The aim of our study was to assess improvements in spatial resolution and noise control from the application of the Astonish resolution recovery algorithm for single photon emission computed tomography imaging. Secondary aims were to compare acquisitions made with low-energy general purpose collimators with those obtained using low-energy high-resolution collimators in this context and evaluate the potential of a finer matrix to improve image quality further. MATERIALS AND METHODS:A Tc-filled Jaszczak phantom with hot spheres was used to assess contrast and noise. A National Electrical Manufacturers Association triple line source single photon emission computed tomography resolution phantom was used to measure spatial resolution. Acquisitions were made using both low-energy high-resolution and low-energy general purpose collimators. RESULTS:Compared with standard ordered subsets expectation maximization reconstructions, the resolution recovery algorithm resulted in a higher spatial resolution (8 vs. 14 mm full-width at half-maximum) leading to reduced partial volume effects in the smaller Jaszczak spheres. Higher image contrast was achieved alongside lower levels of noise. An edge enhancement artefact was observed in the resolution recovery corrected images. An overestimate of the target-to-background activity was also observed for the larger spheres. CONCLUSION:The use of such an algorithm results in images characterized by increased spatial resolution and reduced noise. However, small sources of the order of 2-3 cm can be significantly overenhanced.

journal_name

Nucl Med Commun

authors

O'Mahoney E,Murray I

doi

10.1097/MNM.0b013e32835ce5b5

subject

Has Abstract

pub_date

2013-03-01 00:00:00

pages

240-8

issue

3

eissn

0143-3636

issn

1473-5628

journal_volume

34

pub_type

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