Sandra Hopkins Final Report.pdf - University of Surrey
Sandra Hopkins Final Report.pdf - University of Surrey
Sandra Hopkins Final Report.pdf - University of Surrey
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
The reason for this non symmetry is due to the rotation <strong>of</strong>the C-arm within the gantry in the cranial caudal directionwhich subsequently affects the centre <strong>of</strong> rotation for theRAO/LAO direction. Figure 24 shows an example <strong>of</strong> acombined LAO/Caudal rotation.Figure 24 : Combined rotation <strong>of</strong> the C-armA final set <strong>of</strong> orientations were imaged with Gafchromic film as follows;RAO0 CRAN 40 ; RAO0 CAUD40RAO40 CRAN0 ; LAO40 CRAN0RAO40 CRAN40 ; RAO40 CAUD40LAO40 CRAN40 ; LAO40 CAUD40Figure 25 : Gafchromic film imaged with a mixture <strong>of</strong> combined and single rotationsThe Gafchromic film (figure 25) was compared with images produced using the revised symmetricand original programmes (see figures 26 and 27). Neither programme was a perfect match,however, it was felt that the original programme was a closer representation and was used for all31
Change language