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EJNMMI Research

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
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