Skip to main content

Table 2 Uptake ratio of sphere 1 to sphere 2 and sphere-to-background ratio (SBR) in a modified body phantom

From: Ra-223 SPECT for semi-quantitative analysis in comparison with Tc-99m HMDP SPECT: phantom study and initial clinical experience

Ratio Acquisition Collimator P
MEGP HEGP
Sphere 1/sphere 2
  Planar 1.45 1.47 NA
  SPECT 1.05 0.99 NA
SBR (sphere 2)
  Planar* 13.3 (12.3–14.2) 15.6 (14.1–17.0) 0.0019
  SPECT* 34.5 (30.4–35.3) 39.2 (35.9–43.1) 0.0058
  1. Configuration of the phantom and location of the spheres are described in Fig. 1
  2. Methods of measuring background and sphere counts are described in text
  3. *P < 0.001 for comparison between planar and SPECT imaging
  4. NA not applicable, MEGP medium-energy general-purpose, HEGP high-energy general-purpose