STUDIES ON THYROID VOLUME BY SCINTILLATION SPECTROMETER (in Japanese)
The study on thyroid volume consists of measuring the scatter component from the thvroid gland by differential scanning after the subject has swallowed a dose of radioactive iodine (I-131), and then to find out the gland volume from the calibration curve, in contrast to other available methods, namely palpation and scintiscanning measurement in two planes. The aim of the work is to predict the dose accurately in treating thyroid diseases by irradiation, since the source of greatest inaccuracy in the prediction of dose lies in the determination of gland volume. The differential scans are carried out using a scintillation spectrometer. The differential scan from a thin film source of I-131 shows four gamma energy peaks. On extending the source (increasing the volume) keeping the activity of the rddioactive material and other factors constant, the energy below the photopeak shows increased activity because of scattering effect in the material and the content of the phantom. The above scan, when repeated with phantoms of different volume capacity, yields a calibration curve of percentage scatter vs. phantom volume. The percent scatter from the thyroid gland obtained from a scan from the thyroid of the subject who has swallowed a dose of radioactive iodine then gives a measure of the thyroid volume as obtained from the calibration curve. (T.F.H.)
- Research Organization:
- Inst. of Post-graduate Medical Education and Research, India
- NSA Number:
- NSA-17-030011
- OSTI ID:
- 4710297
- Journal Information:
- Proc. Japan Conf. Radioisotopes, Journal Name: Proc. Japan Conf. Radioisotopes Vol. Vol: 4th
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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