Electronic calibration of single photon emission computed tomogr

Details Electronic calibration of single photon emission computed tomogr Electronic calibration of single photon emission computed tomogr

1993-12-20

1996-01-02

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

2502521, 25036307, 25036309, G01T 1166, G01T 120

Patent

active

054811155

ABSTRACT:
A SPECT camera (A) includes a plurality of detector heads (12a, 12b, 12c) which rotate around an examination region (10). A reconstruction processor (50) reconstructs output projection data from the detector heads into a three-dimensional image representation which is stored in an image memory (62). Selected data from the image memory (62) is converted to a human-readable display on a video monitor (66). To adjust automatically for detector head misalignment, a calibration phantom (B) which has two orthogonal lines of scintillators (20.sub.1, 20.sub.2, 20.sub.3, 20.sub.4, 20.sub.5) arranged orthogonal to each other with a common scintillator in both lines is positioned in the examination region. As the detector heads rotate around the phantom, a misalignment parameter generator (40) generates the displacement distance of the actual rotation from the theoretical rotation axis (.zeta.), the actual rotation radius (R), a projection of the location of the focal point on a detector plane of the detector head in the transaxial direction (C.sub..xi.), and a focal length of the collimator (F). A correction processor (42) corrects the reconstruction processor (50) in accordance with the generated misalignment parameters. In the preferred embodiment, the correction processor provides a revised weighting function to the reconstruction processor and modifies its backprojection algorithm.

REFERENCES:
patent: 4527057 (1985-07-01), Guyton et al.
patent: 4633398 (1986-12-01), Gullberg et al.
patent: 4696624 (1987-09-01), Ichihara
patent: 4703424 (1987-10-01), Gullberg et al.
patent: 4812983 (1989-03-01), Gullberg et al.
patent: 5173608 (1992-12-01), Motomura et al.
patent: 5210421 (1993-05-01), Gullberg et al.
"Review of Convergent Beam Tomography in Single Photon Emission Computed Tomography", Gullberg, et al., Phys. Med. Biol. 1992, vol. 37, No. 3, pp. 507-534.
"Automated Body Contour Detection in SPECT: Effects on Quantitative Studies", Hosoba, et al., J. Nucl. Med. 27:1184-1191, 1986.
"Estimation of Geometrical Parameters For Fan Beam Tomography", Gullberg, et al., Phys. Med. Biol., vol. 32, No. 12, 1581-1594 (1987).
"Estimation of Geometrical Parameters and Collimator Evaluation For Cone Beam Tomography", Gullberg, et al., Med. Phys. 17 (2) Mar./Apr. 1990 pp. 264-272.
"Reconstruction Algorithm For Fan Beam With a Displaced Center-of-Rotation", Gullberg, et al., IEEE Trans. Med. Imag., vol. MI-5, No. 1, Mar. 1986 pp. 23-29.
"Contributions to Cone Beam Tomography", Fuhrmann, et al.

Affiliated with

Also associated with

Rating

Electronic calibration of single photon emission computed tomogr does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic calibration of single photon emission computed tomogr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic calibration of single photon emission computed tomogr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-237183