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A modified maximum likelihood algorithm suitable for volume image reconstruction

Conference · · J. Nucl. Med.; (United States)
OSTI ID:5972104
;

In many ECT imaging systems, the projection data require larger data matrices than the final images, particularly in true three-dimensional imaging systems. Iterative reconstruction algorithms which utilize the projection data directly are, therefore, often cumbersome and slow. The authors have modified the maximum likelihood algorithm to avoid using the projection data in the iterative process. The new back-projected maximum likelihood (BPML) algorithm back-projects the measured projection data for use in place of the actual projections as the basis for iteration. With the BPML algorithm one is not limited in the reconstruction to the ray geometry of the measured data, allowing the user flexibility in choosing the angular sampling scheme for each iteration. The BPML algorithm is used successfully to reconstruct single-slice data from the hexagonal bar positron camera. There is no apparent loss of resolution by using the back-projected image instead of the measured data as the basis for iteration.

Research Organization:
Hospital of the Univ. of Pennsylvania, Philadelphia, PA
OSTI ID:
5972104
Report Number(s):
CONF-850611-
Journal Information:
J. Nucl. Med.; (United States), Journal Name: J. Nucl. Med.; (United States) Vol. 26:5; ISSN JNMEA
Country of Publication:
United States
Language:
English

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Related Subjects

550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
ALGORITHMS
BIOMEDICAL RADIOGRAPHY
CAT SCANNING
COMPUTERIZED TOMOGRAPHY
DATA ANALYSIS
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
IMAGE PROCESSING
ITERATIVE METHODS
MATHEMATICAL LOGIC
MAXIMUM-LIKELIHOOD FIT
MEDICINE
NUCLEAR MEDICINE
NUMERICAL SOLUTION
PROCESSING
RADIOLOGY
RESOLUTION
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
TOMOGRAPHY