DocumentCode :
1224938
Title :
An investigation of the stationarity of the 3D modulation transfer function of SPECT
Author :
Glick, S.J. ; King, M.A. ; Knesaurek, K. ; Burbank, K.
Author_Institution :
Dept. of Nucl. Med., Massachusetts Univ. Med. Center, Worcester, MA, USA
Volume :
36
Issue :
1
fYear :
1989
fDate :
2/1/1989 12:00:00 AM
Firstpage :
973
Lastpage :
977
Abstract :
The authors evaluated the rotational symmetry and stationarity of the three-dimensional (3-D) modulation transfer function (MTF) of single-photon-emission computed tomography (SPECT). Point spread functions (PSF) in scattering media were obtained by placing a point source at varying radial distances from the center of three differently shaped water-filled phantoms. Results indicate that at the center of a nonisotropic phantom, the 3-D MTF is anisotropic. For off-axis source locations the 3-D MTF becomes increasingly anisotropic as the point source is moved radially off center. 3-D MTFs obtained using arithmetic mean averaging of opposing projections showed less low- to mid-frequency but more high-frequency variation with position than 3-D MTFs obtained using geometric mean averaging. It is concluded that the postreconstruction 3-D MTF is anisotropic and nonstationary, and that the inconsistency of the projection data with angle due to nonisotropic attenuation is the major cause of the low- and mid-frequency variation in the transfer functions
Keywords :
computerised tomography; radioisotope scanning and imaging; 3D modulation transfer function; SPECT; nonisotropic phantom; off-axis source locations; point spread functions; rotational symmetry; single-photon-emission computed tomography; stationarity; Anisotropic magnetoresistance; Attenuation; Frequency; Glass; Image reconstruction; Imaging phantoms; Nuclear medicine; Optical modulation; Position measurement; Transfer functions;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/23.34587
Filename :
34587
Link To Document :
بازگشت