The relationship between radiation therapy fraction number and normalized prostate volume in 19 patients.

<p>There was no significant time trend.</p

Definition of the proposed prostate deformation quantification metric.

<p>The solid and dashed lines represent the prostate contours in the planning CT and CBCT scans, respectively. (a) A 2D representation of the sagittal contours of the prostate. To align the positions of the base and apex of prostate contours in the CBCT scans to those in the planning CT scan, craniocaudal views of the prostate contour in the CBCT scans were either expanded or contracted. They were returned to their original states after the alignment. (b) A 2D representation of the axial contours of a prostate. The cross mark is the CoG of the prostate in a representative slice. The arrows indicate the prostate deformation directions.</p

Distribution of the displacement values of the prostate CoG according to magnitudes and directions.

<p><i>Abbreviations</i>: right-left direction: R-L; anterior-posterior direction: A-P; superior-inferior direction: S-I.</p><p>Distribution of the displacement values of the prostate CoG according to magnitudes and directions.</p

Values of the average prostate deformation in the manually defined segments.

<p>Values of the average prostate deformation in the manually defined segments.</p

Standard deviations of the prostate deformation in the manually defined segments.

<p><i>Abbreviations</i>: superior-anterior segment: S-A; superior-posterior segment: S-P; superior-right segment: S-R; superior-left segment: S-L; middle-anterior segment: M-A; middle–posterior segment: M-P; middle–right segment: M-R; middle–left segment: M-L; inferior-anterior segment: I-A; inferior–posterior segment: I-P; inferior–right segment: I-R; inferior–left segment: I-L.</p><p>Standard deviations of the prostate deformation in the manually defined segments.</p