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Comparative analyses of the dynamic properties of the rectum studied by cryo-sections of human cadavers and pelvic CT scans of patients

¹ Centre for Training and Research in Radiotherapy, Departments of ² Medical Physics and ³ Radiotherapy, The Norwegian Radium Hospital, University of Oslo, Oslo, Norway

View larger version (29K): [in a new window]   Figure 1. transversal cross-sectional area of the wall (Aout) and Transversal cross-sectional areas enclosed by the outer contour (Awall) from both male and female cryo-sections as a function of caudo-cranial position. There was a substantial difference between the male and female rectal filling. The position of the prostate was included in the figure.

View larger version (16K): [in a new window]   Figure 2. Transversal cross-sectional area of the wall (Awall) vs transversal cross-sectional areas enclosed by the outer contour (Aout) determined from male cryo-sections. The two filled data points are derived from the two cryo-sections shown in Figure 3.

View larger version (86K): [in a new window]   Figure 3. Delineation of the outer and inner contours (yellow) of (a) an empty and (b) a filled rectum on photos of the male cryo-sections. The caudo-cranial distance between the images is 5.9 cm. For both images, the operator has delineated the inner contours erroneously on purpose, to fix the transversal wall area, Awall, equal to the mean Awall of the whole image set of 3.9 cm2 (Table 3).

View larger version (20K): [in a new window]   Figure 4. Mean transversal cross-sectional area of the wall (Awall) vs mean transversal cross-sectional areas enclosed by the outer contour (Aout) determined from repetetive CT scans performed at our institution (•) and obtained from Figure 4 in the study by Meijer et al [7] ().