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The resolution (left column) and sensitivity (right column) measured by changing (a)–(b) hole length, (c)–(d) hole radius, (e)-(f) source-to-collimator surface distance and (g)–(h) hole shape of the gamma system for 57Co radionuclide (black squares marked), 99mTc radionuclide (red circles marked), 123I radionuclide (blue upper-triangles marked) and 111In radionuclide (cyan lower-triangles marked and only half of the sensitivity shown).
