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The use of filtering methods to compensate for constant attenuation in single-photon emission computed tomography

Journal Article · · IEEE Trans. Bio-Med. Eng.; (United States)
;
A back projection of filtered projection (BKFIL) reconstruction algorithm is presented that is applicable to single-photon emission computed tomography (ECT) in the presence of a constant attenuating medium such as the brain. The filters used in transmission computed tomography (TCT)-comprised of a ramp multiplied by window functions-are modified so that the single-photon ECT filter is a function of the constant attenuation coefficient. The filters give good reconstruction results with sufficient angular and lateral sampling. With continuous samples the BKFIL algorithm has a point spread function that is the Hankel transform of the window function. The resolution and statistical properties of the filters are demonstrated by various simulations which assume an ideal detector response. Statistical formulas for the reconstructed image show that the square of the percent-root-mean-square (percent-rms) uncertainty of the reconstruction is inversely proportional to the total measured counts. The results indicate that constant attenuation can be compensated for by using an attenuation-dependent filter that reconstructs the transverse section reliably. Computer time requirements are two times that of conventional TCT or positron ECT and there is no increase in memory requirements.
Research Organization:
Lawrence Berkeley Lab., CA
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
5309200
Journal Information:
IEEE Trans. Bio-Med. Eng.; (United States), Journal Name: IEEE Trans. Bio-Med. Eng.; (United States) Vol. BNE-28:2; ISSN IEBEA
Country of Publication:
United States
Language:
English

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Related Subjects

550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
550602 -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
ABSORPTION
ALGORITHMS
ATTENUATION
BODY
BRAIN
CENTRAL NERVOUS SYSTEM
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
ELECTROMAGNETIC FILTERS
EMISSION COMPUTED TOMOGRAPHY
ENGINEERING
FILTERS
IRRADIATION PROCEDURES
MATHEMATICAL LOGIC
MOCKUP
NERVOUS SYSTEM
ORGANS
PHANTOMS
RESOLUTION
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
SPATIAL RESOLUTION
STRUCTURAL MODELS
TOMOGRAPHY
USES