Abstract
MIDAS-1 is a version of the Memorial System for computerized implant dosimetry (1, 2). It does not require the user to have programming experience: the programs are written in time-sharing FORTRAN for use on a time-sharing computer.2 The principal options available in the system are: 1. Orthogonal film or stereo shift demagnification. 2. Generalized translation and rotation of output orientation. 3. Dose frequency histogram. 4. Output dose or dose matrix arbitrary with respect to size and scale. 5. Sources considered to be isotropic points. Either an inverse square computation for high-energy gamma emitters or a depth-dose table look-up computation for low-energy x or gamma emitters, may be used to obtain the dose distribution. Figure 1 illustrates the logical flow through the system. MIDAS-1 does not include any specialized radiographic equipment for source-position acquisition. The practicability of use of the input format by non-programmers, at six other institutions, has been proved by twenty months of experience with the Memorial Dose Distribution Computation Service (3). Future versions of MIDAS are planned to include provisions for fixed radiographic localization systems, digitizers, linear sources, and interactive input.
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