X-ray or gamma ray systems or devices – Specific application – Radiation coding
Patent
1992-04-28
1994-10-25
Church, Craig E.
X-ray or gamma ray systems or devices
Specific application
Radiation coding
378 23, 378162, G01N 2300
Patent
active
053596374
ABSTRACT:
A self-calibrating tomosynthetic x-ray system is provided. A calibrated device for recording radiographic images of a selected object irradiated by a source of radiation includes a first radiolucent radiographic recording medium in the form of a CCD device for recording a first projected radiographic image of the selected object. A second radiographic recording medium in the form of a CCD device is supported in fixed generally parallel position relative to the first radiographic recording medium to permit radiation from the source to pass through the first radiographic recording medium and to impinge upon the second radiographic recording medium for recording a second projected radiographic image of the selected object. A radiopaque fiducial reference in the form of a grid is supported in fixed position generally between the first and second radiographic recording mediums to permit a projected image of the radiopaque fiducial reference to be recorded on the second radiographic recording medium. Projected radiographic images of the object and the fiducial reference are then recorded at different arbitrary relative positions between the source of radiation and the object, the fiducial reference, and the recording mediums. An image of a selected object at a selected slice position through the object is synthesized from selected projected radiographic images of the object and the fiducial reference recorded by the calibrated device.
REFERENCES:
patent: 5008947 (1991-04-01), Yamada
patent: 5051904 (1991-09-01), Griffith
Webber, R. L., et al., "Synthesis of Arbitrary X-Ray Projections from a Finite Number of Existing Projections," SPIE vol. 535 --Application of Optical Instrumentation in Medicine XIII.
Grant, D. G., "Tomosynthesis: A Three-Dimensional Radiographic Imaging Technique," IEEE Transactions on Bio-Medical Engineering, vol. BME-19, No. 1, Jan. 1972, pp. 20-28.
Ruttimann, U. E., et al., "Restoration of Digital Multiplane Tomosynthesis by a Constrained Iteration Method," IEEE Transactions on Medical Imaging, vol. ME-3, No. 3, Sep. 1984, pp. 141-148.
Ruttimann, U. E., et al., "An Optimal Synthetic Aperture for Circular Tomosynthesis," Medical Physics, vol. 16, No. 3, May/Jun. 1989, pp. 398-405.
Church Craig E.
Wake Forest University
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