Fig. 4From: Ra-223 SPECT for semi-quantitative analysis in comparison with Tc-99m HMDP SPECT: phantom study and initial clinical experienceRelationship between radio-concentration of Ra-223 and SPECT counts at 84 keV ± 20% when using the MEGP or HEGP collimators. MEGP medium-energy general purpose, HEGP high-energy general purposeBack to article page