Single‐ and double‐plane iridium‐192 interstitial implants: Implantation guidelines and dosimetry

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Abstract
Computerized dosimetric studies of single‐ and double‐plane iridium‐192 (Ir‐192) planar implants were performed. With respect to dose homogeneity, we found that the optimal source and ribbon separation for single‐plane implants was 1.0 cm. For double‐plane implants, the preferred ribbon and plane separation was 1.5 cm, maintaining a 1‐cm separation for the sources. Using these separations, standard dose rate curves for single‐ and double‐plane Ir‐192 implants were generated by computer calculations. These standard curves are useful for quickly and fairly accurately estimating the dose from any size planar implant, without requiring more time‐consuming individual computer dosimetry. We believe that the curves will prove to be of practical clinical value to physicists and radiotherapists.

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