Registers – Calculators – Tabular
Patent
1974-02-12
1978-02-21
Franklin, Lawrence R.
Registers
Calculators
Tabular
235 647, G06G 100
Patent
active
040748502
ABSTRACT:
A manually operable computer for determining exposure settings of an X-ray machine comprising two juxtaposed scale members. Means are provided for supporting said scale members for movement relative to each other, a first scale on one of said members denoting thicknesses of a subject to be radiographed and a second scale thereon in predetermined fixed relation to the first scale denoting certain exposure settings of an X-ray machine. A third scale is provided on the other scale member denoting certain other exposure settings, said second and third scales together forming a single chart of exposure settings in the form of voltage, current and time. The first scale includes a plurality of non-linearly spaced dimensional indicia indicative of said thicknesses. The second scale includes a plurality of spaced indicia of one form of exposure setting, and the third scale includes a plurality of spaced indicia of a second form of exposure setting in generally parallel juxtaposed arrangement with respect to the indicia of the second scale. The indicia of the second and third scales when positionally related determines the settings of an X-ray machine to obtain a particular X-ray exposure. The spacings, values and positional relationship of the aforesaid indicia are further arranged and selected according to predetermined non-linear relationships as to provide X-ray exposure settings on the chart for different thicknesses of a given anatomical subject which will yield a substantially constant density radiograph, all other conditions of taking the radiograph remaining constant. Indexing means identifiable with selected ones of said dimensional indicia for determining the relative positions of said first and second members are provided on said supporting means.
REFERENCES:
patent: 1186093 (1916-06-01), Harvey
patent: 2411491 (1946-11-01), Williams
patent: 2443882 (1948-06-01), Allen
patent: 2455522 (1948-12-01), Ringler
patent: 2484366 (1949-10-01), Wilson
patent: 2639091 (1953-05-01), Elias
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