X-ray or gamma ray systems or devices – Accessory – Testing or calibration
Patent
1992-11-25
1994-08-02
Porta, David P.
X-ray or gamma ray systems or devices
Accessory
Testing or calibration
378 18, 378 56, G01D 1800
Patent
active
053352602
ABSTRACT:
A calibration phantom representative of human tissue containing variable concentrations of calcium serves as a calibration reference for quantifying calcium, bone mass and bone mineral density in radiography and CT imaging systems. The method of fabrication of the calibration phantom provides the long-term stable incorporation of calcium into a tissue equivalent material which allows accurate, standardized, and reproducible quantification of calcium and bone mineral density in radiography and CT imaging systems. A method of using the calibration phantom for quantifying calcium and bone includes placement of part of a patient's anatomy in a bolusing apparatus to provide uniform attenuation of the x-ray beam passing through and around the patient's anatomy. A x-ray filter plate may be used to predictably attenuate the x-ray beam.
REFERENCES:
patent: 2399650 (1946-05-01), Moyer
patent: 2426884 (1947-09-01), Kieffer
patent: 4115691 (1971-09-01), Oldendorf
patent: 4115762 (1978-09-01), Akiyama et al.
patent: 4124799 (1978-11-01), Schittenhelm
patent: 4233507 (1980-11-01), Volz
patent: 4400827 (1983-08-01), Spears
patent: 4475122 (1984-10-01), Green
patent: 4593406 (1986-06-01), Stone
patent: 4649561 (1987-03-01), Arnold
patent: 4724110 (1988-02-01), Arnold
patent: 4811373 (1989-03-01), Stein
patent: 4922915 (1990-05-01), Arnold et al.
patent: 4941164 (1990-07-01), Schuller et al.
patent: 4985906 (1991-01-01), Arnold
patent: 5005196 (1991-04-01), Lanza et al.
patent: 5122664 (1992-06-01), Ito et al.
patent: 5187731 (1993-02-01), Shimura
Robert H. Heil, Jr., et al., "Quantitative Materials Evaluation and Inspection with the Imaging Analysing Computer", Proceedings of the Society of Photo-Optical Instrumentation Engineers, Feb. 1972, pp. 131-143.
K-P Hermann, et al., "Polyethylene-Based Water-Equivalent Phantom Material for X-Ray Dosimetry at Tube Voltages from 10 to 100 kV", Phys. Med. Biol., vol. 30, No. 11, 1985, pp. 1195-1200.
K-P Hermann, et al., "Muscle and Fat-Equivlent Polyethylene-Based Phantom Materials for X-Ray Dosimetry at Tube Voltages Below 100 kV", Phys. Med. Biol., vol. 31, No. 9, 1986, pp. 1041-1046.
Christopher E. Cann, et al., "Precise Measurement of Vertebral Mineral Content Using Computed Tomography", Journal of Computer Assisted Tomography, vol. 4, No. 4, Aug. 1980, pp. 493-500.
Christopher E. Cann, et al., "Low-Dose CT Scanning for Quantitative Spinal Mineral Analysis", Radiology, vol. 140, No. 3, Sep. 1981, pp. 813-815.
Robert G. Zamenhof, et al., "A Theoretical Sensitivity Evaluation of CT for the Measurement of Bone Mineral in Cortical and Vertebral Bone", Journal of Computer Assisted Tomography, Proceeding of CT Densitometry Workshop, vol. 3, No. 6, 1979, p. 852.
Technical Note, "Automatic Outlining Technique for EMI Scanner Pictures", Med. & Biol. Eng. & Comput., 17, Sep. 1979, pp. 693-694.
R. E. Baldy, et al., "A Fully-Automated Computer Assisted Method of CT Brain Scan Analysis for the Measurement of Cerebrospinal FLuid Spaces and Brain Absorption Density", Neuroradiology, vol. 28, 1986, pp. 109-117.
James M. Keller, et al., "Automatic Outlining of Regions on CT Scans", Journal of Computer Assisted Tomography, vol. 5, No. 2, Apr. 1981, pp. 240-245.
W. A. Kalender, et al., "Methodological Aspects of Bone Mineral Measurements by QCT: Minimizing Operator Influence on Reproductibility," Proceedings of the Sixth International Workshop on Bone and Soft Tissue Densitometry, Buxton, England, Sep. 22-25, 1987, p. 31.
P. F. Wankling, et al., "Computer Recognition Applied to C.T. Scans for the Automation of the Procedure for Bone Mineral Measurement Allowing Consistent Measurement Without Operator Intervention", Proceedings of the Sixth International Workshop on Bone and Soft Tissue Densitometry, Buxton, England, Sep. 22-25, 1987, p. 32.
Willi A. Kalender, et al., "Vertebral Bone Mineral Analysis: An Integrated Approach with CT", Radiology 1987, vol. 164, No. 2, Aug. 1987, pp. 419-423.
J. L. Grashuis, et al., "Semi-Automatic Contour Detection in CT-Scans of the Lumbar Spine", Proceedings of the Sixth International Workshop on Bone and Soft Tissue Densitometry, Buxton, England, Sep. 22-25, 1987, p. 33, published in Calcified Tissue, vol. 44, No. 2, Feb. 198, p. 147.
Marketing materials from General Electric distributed in 1987 (four pages).
Christopher E. Cann, et al., "Spinal Mineral Loss in Oophorectomized Women", JAMA, No. 7, 1980, vol. 244, No. 18, pp. 2056-2059.
Heuck, "Quantitative Measurements of Mineral Content in Bone Disease," Session 10, Symposium Ossium E.S. Livingstone, Edingburgh, Scotland (1970), pp. 141-147.
Vogel, "Application Principles and Technical Considerations in SPA," in Proceedings Osteoperosis Update Harry Jerant ed., Radiology Research and Education Foundation, University of California printing (1987), pp. 219-231.
Felicia Cosman, et al., "Radiographic Absorptiometry: A Simple Method for Determination of Bone Mass", Osteoporosis International, 1991, pp. 34-38.
Copy of a brochure on "Bone Mineral Density Evaluation" by CompuMed.
S. Serpico, et al., "Evaluation and Standardization in Bone Densitometry", Transactions of the Fifth International Workshop on Bone and Soft Tissue Densitometry Using Computed Tomography, The University of Pennsylvania, Oct. 14-18, 1985.
M. E. Bolander, et al., "Quantitative Digital Subtraction Radiography: A Clinical Method for Bone Mineral Determination", Transactions of the Fifth International Workshop on Bone and Soft Tissue Densitometry Using Computed Tomography, The University of Pennsylvania, Oct. 14-18, 1985.
D. J. Hawkes, et al., "Development of a Digital Radiographic Technique to Measure Bone Mineral in Neonates", Transactions of the Fifth International Workshop on Bone and Soft Tissue Densitometry Using Computed Tomography, The University of Pennsylvania, Oct, 14-18, 1985.
Robert A. Kruger, Ph.D., et al., "Dual Energy Film Subtraction Technique for Detecting Calcification in Solitary Pulmonary Nodules", Radiation Physics, vol. 140, Jul. 1981, pp. 213-219.
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