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Table 4 Treatment and dosimetry results

From: Stereotactic body radiation therapy for the treatment of localized prostate cancer in men with underlying inflammatory bowel disease

  IBD No IBD p value
n % n %
Radiation dose      
 3500 cGy in 5 fractions 26 84 3139 75 0.46
 3625 cGy in 5 fractions 3 10 537 13  
Whole pelvis      
 2100 cGy in 3 fractions 1 3 422 10  
 1950 cGy in 3 fractions 1 3 86 2  
IBD Dosimetric parameters Mean Median Range
Target coverage    
 CTV VRx (%) 99 100 99–100
 PTV VRx (%) 97 97 95–100
IDL (%) 84 84 83–88
Max dose (cGy) 4200 4200 4118–4217
Rectum Max (cGy) 3800 3800 3604–3919
Rectum V37.8 (%) 0.1 0 0–0.3
V37.8 cc (cc) 0.04 0 0–0.2
Rectum V33.9 (%) 5.2 4.7 1–13
V33.9 cc (cc) 2.7 2 1–9
Rectum V29 (%) 15 15 6–25
V29 cc (cc) 7.7 6.3 3–18
Rectum V19.2 (%) 37 37 20–56
V19.2 cc (cc) 19 16 9–34
Rectum V36 (cc) 0.35 0.29 0.01–1
Large Bowel Max (cGy) 2600 2600 1239–3689
Small Bowel Max (cGy) 1100 1100 956–1224