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Table 3 Rectum dosimetry according to tertiles of adipose tissue measurement

From: Influence of body mass index and periprostatic fat on rectal dosimetry in permanent seed prostate brachytherapy

 

R100

P=*

R150

P=

D2

P=

Visceral fat

 

0.003

 

0.004

 

0.013

1st Tertile

1.2/0.98 (0.8)

 

0.17/0.36 (0.4)

 

272/257 (108)

 

2nd Tertile

1.1/1.1 (0.8)

 

0.33/0.23 (0.4)

 

255/244 (87)

 

3rd Tertile

0.7/0.5 (0.7)

 

0.16/0.07 (0.3)

 

213/204 (96)

 

Subcut. fat (iliac crest)

 

0.004

 

0.01

 

0.017

1st Tertile

1.2/0.98 (0.9)

 

0.33/0.17 (0.4)

 

274/257 (112)

 

2nd Tertile

1.0/1.0 (0.7)

 

0.3/0.2 (0.3)

 

251/241 (85)

 

3rd Tertile

0.7/0.5 (0.7)

 

0.17/0.07 (0.3)

 

216/205 (94)

 

Subcut. fat (symphysis)

 

0.09

 

0.14

 

0.23

1st Tertile

1.1/0.8 (0.9)

 

0.26/0.11 (0.4)

 

260/244 (119)

 

2nd Tertile

1.0/1.0 (0.7)

 

0.29/0.14 (0.3)

 

242/230 (87)

 

3rd Tertile

0.70/0.52 (0.6)

 

0.17/0.06 (0.2)

 

217/207 (94)

 

Periprostatic Fat

 

0.86

 

0.55

 

0.61

1st Tertile

0.96/0.72 (0.9)

 

0.25/0.16 (0.4)

 

238/204 (131)

 

2nd Tertile

0.93/0.89 (0.7)

 

0.24/0.16 (0.3)

 

238/239 (78)

 

3rd Tertile

0.86/0.73 (0.7)

 

0.24/0.08 (0.3)

 

243/226 (107)

 

BMI

 

0.001

 

0.003

 

<0.001

<25 kg/m2 (n = 43)

0.96/0.75 (0.8)

 

0.23/0.08 (0.3)

 

239/221 (110)

 

25-30 kg/m2 (n = 98)

0.98/0.73 (0.9)

 

0.28/0.12 (0.4)

 

239/227 (90)

 

30-35 kg/m2 (n = 53)

0.65/0.36 (0.7)

 

0.26/0.03 (0.8)

 

191/178 (92)

 

>35 kg/m2 (n = 17)

0.38/0.22 (0.5)

 

0.06/0.01 (0.1)

 

156/157 (75)

 
  1. Results are in mean/median (SD). Differences between tertiles were calculated using the Kruskal Wallis nonparametric test. *Bold values indicate a significant result
  2. R100/R150: volume of anterior rectal wall receiving 100%/150% of the prescribed dose in cc.
  3. D2: isodose that encompassed 2% of the rectal volume in Gy.
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Radiation Oncology

ISSN: 1748-717X

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