定量的な放射性タリウムイメージングのためのコリメータ選択

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  • Collimator Selection for Quantitative 201Tl Radiopharmaceutical Imaging.
  • テイリョウテキ ナ ホウシャセイ タリウム イメージング ノ タメ ノ コリメ

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We investigated the performance of a low-energy (LE) collimator and a medium-energy (ME) collimator in201Tlradiopharmaceutical scintigraphic imaging contaminated with202Tlwhich emittes higher energy photons (440 keV) . Using these collimators, energy spectra, planar images and SPECT images were acquired for three201Tlradiopharmaceutical sources. From the result of the energy spectra measurement, the LE collimator had a large amount of septral penetration by the high energy photons from202Tl, compared with the ME collimator, but both collimators showed the almost same energy distribution at201HgX-ray energy region. In planar and SPECT imaging using single-energy window (W1 : 71 keV±15%), both collimators had the same contrast values for some cold lesions, but for dual-energy window (W1 plus W2 : 167 keV±10%) the ME collimator gave better contrast values than the LE one. In conclusion, the LE collimator is suitable for the single-energy window (W1) imaging and the use of the ME collimator is recommended for the dual-energy window (W1+W2) imaging.

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