The direct use of CT numbers in radiotherapy dosage calculations for inhomogeneous media.
Techniques by which the quantitative anatomical data inherent in a CT scan can be directly used in treatment planning are described. The correction algorithms used in the RAD-8 system, based on an effective path length, have been extended to a pixel-by-pixel approach. By calibrating the X-ray transmission CT scanner in terms of electron densities (electron cm-3) inhomogeneity corrections may be made automatically.
D006801:Humans; D008175:Lung Neoplasms / Q000532:radiotherapy; D010347:Patient Care Planning; D011879:Radiotherapy Dosage; D014057:Tomography, X-Ray Computed