Methods and devices for quantitative analysis of x-ray images
View Patent ↗The present invention relates to networked enabled analysis of x-ray images. Also described are devices comprising calibration phantoms; methods of using these devices; methods of formulating databases containing information regarding x-ray images; the databases themselves; and methods of manipulating the information and databases.
1. A method of generating a density calibration curve, comprising the steps of
(a) providing an assembly comprising an x-ray film holder; x-ray film and a wedge-shaped calibration phantom having length (L) and varying thickness (T) along the length;
(b) producing an x-ray image of an anatomical structure, wherein the x-ray image comprises the calibration phantom;
(c) measuring attenuation at a multitude of points in the x-ray image of the calibration phantom;
(d) measuring attenuation of at least one point of known density in the x-ray image of the anatomical structure;
(e) generating a calibration curve that describes the relationship between attenuation measured in (c) and (d) and material thickness; and
(f) translating the calibration curve describing thickness into a curve describing calcium concentration.
2. The method of claim 1 , wherein the calibration phantom comprises aluminum and the calibration curve describes aluminum thickness.
3. The method of claim 1 , wherein the x-ray image is a dental x-ray.
4. The method of claim 1 , wherein the calibration curve is generated in a network environment.
5. A method of diagnosing osteoporosis comprising the step of analyzing an x-ray obtained by the method of claim 1 , wherein if the bone mineral density is below a reference standard, osteoporosis is diagnosed.
6. A method of treating osteoporosis comprising diagnosing osteoporosis according to the method of claim 5 and administering one or more anti-resorptive agents or one or more anabolic agents.
7. The method of claim 1 , wherein, in step (d), the at least one point of known density in the anatomical structure is in muscle, fat, or air.
8. The method of claim 7 , wherein the fat is subcutaneous fat.