X-ray or gamma ray systems or devices – Accessory – Testing or calibration
Patent
1996-11-19
1997-09-30
Wong, Don
X-ray or gamma ray systems or devices
Accessory
Testing or calibration
378 54, G01D 1800
Patent
active
056733038
ABSTRACT:
A method and apparatus are provided for the measurement of structural width and density with a CT scanner. The density of a particular structure is determined by establishing a radial density profile of a structure, identifying a peak density value along said density profile, interpolating a first curve of density versus width from a point defined by the structural width and the peak density value, and identifying a maximum density value of said first curve to establish a structural density value. The width of the structure is determined by identifying first and second radial positions corresponding to respective points on said radial density profile where the profile rises above and falls below first and second threshold values, measuring a difference between said first radial position and said second radial position, and determining the width of the structure as a function of the measured difference.
REFERENCES:
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"Constant Cortical Density is a Requirement for the Accurate Measurement of Cortical Thickness by CT" Hangartner et al, Bone and Mineral, Supplement 2 to Vol. 25, Apr. 1994, p. S4.
"Measurement of Cortical Bone by Computed Tomography" Hangartner et al., 9th International Bone Densitometry Workshop Abstracts, Sep. 26-30, 1992, p. 30.
"Thickness of the Cortical Layer as an Estimae of Mineral Content of Human Finger Bones", by P. Virtama, M.D. et al., Vo. XXXIII, No. 385, Rentgen Dept. Second Medical Clinic, University Central Hospital, Helsinki, Aug. 1959.
"The Radiological Diagnosis of Osteoporosis: A New Approach", by Ellis Barnett, D.M.R.D., FFR. et al., Department of Radiology and the University Department of Medicine, Gardiner Institue, Western Infirmary, Glasgow, Apr. 1959.
"Size of Cortical Bone and Relationship to Bone Mineral Density Assessed by Quantitative Computed Tomography Image Segmentation", Olivia Louis, M.D., Ph.D. et al., Investigative Radiology, vol. 28, No. 9, 802-805, 1993.
Wong Don
Wright State University
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