Collimators for Nuclear Medicine

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Design Calculator

Enter the collimator geometry (hole length, hole diameter, septa) and select the photon energy in the form below, then press the Calculate button to see the calculated collimator performance (resolution, sensitivity, septa penetration).

Hole Length (mm)	Hole Diameter (mm)	Septal Thickness (mm)	Energy (Isotope) (keV)
			140 (Tc-99m: 140keV) 50 60 70 (Tl-201: 72 keV) 80 90 (Ga-67: 93keV) 100 (Gd-153: 97/103keV) 110 120 (Co-57: 122keV) 130 140 (Tc-99m: 140keV) 150 160 (I-123: 159keV) 170 (In-111: 173keV) 180 (Ga-67: 185keV) 190 200 210 220 230 240 250 260 270 280 290 300 (Ga-67: 300keV) 310 320 330 340 350 360 (I-131: 364keV) 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 (F-18: Positron)
Resolution (mm @ 10cm)	Sensitivity (c/min/µCi)	Penetration (%)

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L=Hole Length, H=Hole Diameter, S=Septal Thickness

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Note

Calculations are for parallel-hole collimators only. Performance of a collimator with the specified design may differ in practice to these calculated values. Sensitivity and resolution values depend on the isotope, detector spatial resolution, crystal thickness and the gap between the collimator and crystal.

Furthermore, there may be design limitations due to production limitations. As a rule of thumb the minimum hole diameter is 1.2 mm and minimum septa is 0.15 mm. There might be weight and dimensional restrictions for commercial cameras as well. Please contact us to discuss and optimize your design!