Gynae BT_Lucknow_2018

TRUS assisted HRCTV delineation on CT images

MRI TRUS-CT Mean

Pearson correlation coefficient (r)

P-value

HR-CTV

difference of MRI-CT

3.4 ( ± 1.0) 3.9 ( ± 0.9) 0.1 ( ± 0.0)

0.75

0.000*

Width

Level 1 (Point A) Mean ( ± SD)

Thickness 3.1 ( ± 1.0) 3.0 ( ± 0.7) 0.2 ( ± 0.6)

0.80

0.000*

3.7( ± 1.0) 4.0 ( ± 0.8) -0.5 ( ± 0.6)

0.69

0.000*

Width

Level 2 Mean ( ± SD)

3.2 ( ± 1.0) 3.1 ( ± 0.7) 0.2 ( ± 0.6)

0.70

0.000*

Thickness

3.8 ( ± 0.8) 4.1 ( ± 0.7) -0.3 ( ± 0.5)

0.80

0.000*

Width

Level 3 Mean ( ± SD)

Thickness 3.3 ( ± 0.7) 3.1 ( ± 0.8) -0.4 ( ± 0.7)

0.73

0.000*

• Correlation was good when para disease defined at BT • With Para Invasion: Overestimation of width on CT • Dosimetric Impact: Ongoing