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Table 2 The correlations of attenuation coefficients between original attenuation map (μ-map) (ground truth) and synthetic μ-map (n = 30)

From: CT-free quantitative SPECT for automatic evaluation of %thyroid uptake based on deep-learning

Metric

L1c + LGDLd with psh

L1 + LGDL with pi

L2e + LGDL with ps

L2 + LGDL loss with p

R2

MSEf (× 10−4)

%NMAEg

R2

MSE (× 10−4)

%NMAE

R2

MSE (× 10−4)

%NMAE

R2

MSE (× 10−4)

%NMAE

Mean

0.972

0.936

0.999

0.972

0.939

1.002

0.971

0.977

1.143

0.971

0.961

1.143

STDa

0.012

0.425

0.262

0.012

0.447

0.274

0.012

0.426

0.282

0.012

0.426

0.282

SERb

0.002

0.078

0.048

0.002

0.081

0.050

0.002

0.078

0.052

0.002

0.078

0.052

  1. aStandard deviation
  2. bStandard error
  3. cThe sum of the absolute differences between the target and generated
  4. dGradient difference loss
  5. eThe sum of the squared differences between the target and generated
  6. fMean square error
  7. gNormalized mean absolute error
  8. hPrimary emission SPECT + scattering SPECT
  9. iPrimary emission SPECT