診断用X線の線質測定法の検討

概要

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A T.M.C.method(Tokyo Medical College)capable of calculating the qualities of X-rays(half-value layer, effective energy and uniformity)has been developed. The T.M.C.method was developed based on the Greening's method^1) which can calculate the attenuation curves according to measurements of attenuation ratios using two different aluminum thicknesses. To obtain the best combination of the aluminum thicknesses, the calculation errors for half-value and one-fourth value layers were estimated using 695 types of X-rays between the effective energy range of 25 and 48 keV, which were produced by changing types of generators, tube voltage and additional filters. The best combinations of the aluminum thicknesses to minimize the calculation errors for the two divided energy ranges of 25 to 37 keV and 37 to 48 keV were 2 mm plus 6 mm, and 3 mm plus 8 mm, respectively. The calculated errors for these combinations were less than 2% for both cases. For the measurement of the total energy region using one combination, the best combination was found to be 2.5 and 7.5 mm with a maximum error of 3.4%.
社団法人日本放射線技術学会の論文
1995-01-01