X-ray or gamma ray systems or devices – Accessory – Testing or calibration
Patent
1987-12-17
1988-11-29
Fields, Carolyn E.
X-ray or gamma ray systems or devices
Accessory
Testing or calibration
378 18, 2502521, G01D 1800
Patent
active
047887060
ABSTRACT:
X-ray energy in an x-ray beam is determined from a comparison of apparent absorption of energy by three different materials. Initially, the attenuation coefficients of each of the materials as a function of x-ray energy is determined. The ratios of attenuation coefficient differences between two of the materials and between one of the two materials and the third material are plotted over an energy range of interest. Thereafter, the materials are x-rayed and their absorption characteristics determined. The ratio between the differences in absorption characteristics is then calculated in the same manner as the ratio of attenuation coefficients. Matching ratios are then used to identify the energy level of the x-ray beam.
REFERENCES:
patent: 4323782 (1982-04-01), Riihimaki et al.
patent: 4344183 (1982-08-01), Jacobson
patent: 4352020 (1982-09-01), Horiba et al.
patent: 4571491 (1986-02-01), Vinegar et al.
patent: 4613754 (1986-09-01), Vinegar et al.
patent: 4649561 (1987-03-01), Arnold
D. R. White; "The Measurement of Effective Photon Energy and Linearity in Computerized Tomography"; British Journal of Radiology; 1/80; pp. 5-11.
E. C. McCullough et al; "Performance Evaluation and Quality Assurance of Computed Tomography Scanners"; Radiation Physics; Jul., 1976, pp. 173-188.
R. J. Kriz et al; "An Investigation of Computer Tomography (CT) Linearity"; a pre-print believed to have been published in proceedings of Society of Photographic Instrumentation Engineers.
M. R. Millner et al; "Determination of Effective Energies in CT Calibration", Medical Physics; Nov/Dec., 1978, vol. 5, #6, pp. 543-545.
R. A. Rutherford et al; "Calibration and Response of an EMI Scanner", Neuroradiology; 1976; pp. 7-13.
D. R. Jacobson; "Quality Assurance for Computed Tomography Correlation with System Performance"; Application for Optical Instrumentation in Medicine XI; Apr., 1983; vol. 419, pp. 157-165.
Beusse James H.
Fields Carolyn E.
Freeman John C.
General Electric Company
Stoner Douglas E.
LandOfFree
Method of measurement of x-ray energy does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of measurement of x-ray energy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of measurement of x-ray energy will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-368151