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Table 4 Per-cycle dosimetry estimates obtained with hybrid methods based on two time points for the first cycle and one time point or no imaging at all for subsequent cycles (induction cycles only, n = 173)

From: Accuracy and reproducibility of simplified QSPECT dosimetry for personalized 177Lu-octreotate PRRT

 

Absorbed dose (Gy)

Correlation vs. 3TP (r)a

Relative error vs. 3TP (%)

3TP

2TP/1TPD1

2TP/1TPD3

2TP/NI

2TP/1TPD1

2TP/1TPD3

2TP/NI

2TP/1TPD1

2TP/1TPD3

2TP/NI

Kidney

4.8

[2.9–6.6]

(1.6–8.7)

5.1

[3.0–7.1]

(1.8–11.3)

4.9

[3.0–6.9]

(1.7–9.2)

4.7

[2.7–7.3]

(1.1–10.5)

0.887

0.985

0.807

3.4

[− 9.5–26.8]

(− 38.3–86.3)

2.2

[− 2.0–7.4]

(− 17.9–32.1)

0.6

[− 23.5–27.8]

(− 60.2–106.3)

Bone marrowself

0.29

[0.14–0.65]

(0.06–3.84)

0.22

[0.11–0.73]

(0.06–2.33)

0.24

[0.13–0.64]

(0.06–2.83)

0.24

[0.10–0.65]

(0.04–3.85)

0.733

0.939

0.707

−7.0

[− 56.6–76.3]

(− 73.9–155.8)

−7.2

[− 33.2–22.4]

(− 44.2–51.0)

−13.8

[− 56.0–65.3]

(− 93.8–370.9)

Bone marrowcross

0.023

[0.011–0.052]

(0.005–0.100)

0.022

[0.011–0.054]

(0.003–0.113)

0.021

[0.010–0.050]

(0.004–0.107)

0.022

[0.010–0.060]

(0.003–0.141)

0.966

0.991

0.907

−2.2

[− 21.2–14.9]

(− 55.1–66.4)

−4.2

[− 15.7–2.7]

(− 37.3–22.6)

1.3

[− 35.7–40.8]

(− 52.5–113.0)

Tumormaxb

29.7

[6.2–65.9]

(1.7–120.0)

32.8

[7.0–66.6]

(1.5–104.5)

31.2

[6.2–66.8]

(1.9–102.1)

45.6

[9.9–113.9]

(3.2–235.1)

0.946

0.980

0.713

3.6

[− 20.4–39.0]

(− 46.7–141.8)

2.3

[− 11.5–21.6]

(− 30.2–65.3)

31.0

[− 13.0–192.5]

(− 49.9–6171.7)

  1. D1 day 1, D3 day 3, NI no imaging, TP time point(s)
  2. Data is presented as median [interdecile range] (range)
  3. Median injected activity was 7.8 (range, 0.7–32.4) GBq
  4. aSpearman’s correlation, P < 0.0001 in all cases
  5. bn = 172