(来学网)用于PET分辨率测试的点源要求是
  • A.
    (来学网)比活度>1mCi/ml,各向直径<5mm
  • B.
    (来学网)比活度>2mCi/ml,各向直径<4mm
  • C.
    (来学网)比活度>3mCi/ml,各向直径<3mm
  • D.
    (来学网)比活度>4mCi/ml,各向直径<2mm
  • E.
    (来学网)比活度>5mCi/ml,各向直径<1mm
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