Restoration of gamma camera-based nuclear

Journal Article · Fri Dec 01 04:00:00 EST 1989 · IEEE Transactions on Medical Imaging (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/42.41482· OSTI ID:7029634

Wallis, J W; Miller, T R; Lerner, C A ^[1]; Kleerup, E C ^[2]

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1. Dept of Electrical Engineering, The Univ of Calgary, Calgary, Alt. (CA)
2. Division of Nuclear Medicine, Foothills Hospital, Calgary, Alta (CA)

Nuclear medicine images suffer from poor spatial resolution due to the collimating system associated with the gamma camera system. Experiments were conducted using a Siemens Rota camera to study the applicability of two linear shift-invariant (LSI) filters, namely the Wiener and power spectrum equalization filters, for restoration of planar projections and single photon emission computed tomography (SPECT) images. In the restoration scheme, the system transfer function, computed from a line source image, is modeled by a 2-D Gaussian function. The noise power spectrum is modeled as a constant for planar images, and as a ramp for SPECT images. The filters have been applied to restore: computer-simulated 1-D and 2-D projections and SPECT images of two simple phantoms; 2-D projections of two phantoms obtained from the Siemens Rota camera; and SPECT images of a cardiac phantom obtained from the Siemens Rota camera. The filters are shown to perform partial restoration. Considerable noise suppression and detail enhancement have been observed in the restored images. Quantitative measurements such as root mean squared error and contrast ratio are used for objective analysis of the results.

• OSTI ID: 7029634
• Journal Information: IEEE Transactions on Medical Imaging (Institute of Electrical and Electronics Engineers); (USA), Journal Name: IEEE Transactions on Medical Imaging (Institute of Electrical and Electronics Engineers); (USA) Vol. 8:4; ISSN 0278-0062; ISSN ITMID
• Country of Publication: United States
• Language: English

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BODY
CAMERAS
CARDIOVASCULAR SYSTEM
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
DIAGNOSTIC USES
EMISSION COMPUTED TOMOGRAPHY
FUNCTIONS
GAMMA CAMERAS
GAUSS FUNCTION
HEART
IMAGE PROCESSING
IMAGE SCANNERS
MEDICINE
MOCKUP
NUCLEAR MEDICINE
ORGANS
PHANTOMS
PROCESSING
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
STRUCTURAL MODELS
TOMOGRAPHY
USES