I-131 TREATMENT OF THYROID-CANCER - ABSORBED DOSE CALCULATED FROM POST-THERAPY SCANS

  • 1 July 1986
    • journal article
    • research article
    • Vol. 27  (7) , 1207-1211
Abstract
The radiation absorbed dose for nine neck lesions distributed among four thyroid-cancer patients was measured directly from images taken after administration of a treatment dose of 131I. The tumor volume was measured with anterior plus lateral pinhole images by determining magnification and assuming an ellipsoidal shape. Uptake and effective half-life were determined from serial anterior images by use of a calibration curve. Dose lower limits ranged from 2,400 to 29,900 rad. Response to treatment was judged on the basis of one or more follow-up scans at least 8 mo. later. All lesions responded to the therapy administration which ranged from 150 to 175 mCi.