Sandra Hopkins Final Report.pdf - University of Surrey

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For the purpose of this work a field area of 13.5cm was used as this tied in with the acquisition partof the examination, which represents approximately 85% of the total skin dose.Figure 18 shows gafchromic film imaged with the following orientations;0RAO, 35CRAN0RAO, 35CAUD35RAO, 0CRAN35LAO, 0CRANThis demonstrated good symmetry.This was recreated in the originalMatlab programme and is shown infigure 19. The original programmedemonstrated some non symmetrysuch that the field areas in theRAO/LAO directions were narrowerthan the CRAN/CAUD directions.Figure 18 : Gafchromic image of symmetric rotationThe programme was modified to make it symmetric. The image from the symmetric programme isalso shown in figure 20. For this particular set of parameters the new symmetric programme was abetter representation of the true situation.Figure 19 : Original programme for 35 degree rotationsFigure 20 : Symmetric programme for 35 degree rotations29
However, a second set of orientationswas checked which was still expected tobe symmetric but included orientationsthat combined the RAO/LAO with theCRAN/CAUD rotation as follows:RAO35 CAUD35RA035 CRAN35LAO35 CAUD35LAO CRAN35Figure 21 shows Gafchromic film imagedwith the above parameters. The resultsclearly show non symmetry in theRAO/LAO rotation compared with theFigure 21 : Gafchromic film imaging 35 degree combined rotationsCRAN/CAUD rotation. Figure 22 shows the image created with the symmetric programme. TheGafchromic image shows that when rotated in the RAO/LAO direction and combined withCRAN/CAUD rotation the left hand and right hand edges do not change their angulation very muchcompared to the CRAN/CAUD direction. This is recreated in the symmetric version of the MatLabprogramme. Figure 23 also shows the image displayed for the above orientations using the originalprogramme which appeared to provide a better match.Figure 22 : Symmetric programme for combined anglesFigure 23 : Original programme for combined angles30
Page 1 and 2: Calculation, verification and monit
Page 3 and 4: AcknowledgementsI would like to exp
Page 5 and 6: 4.3.2 Simulated Patient Skin Absorb
Page 7: These types of interventional proce
Page 12 and 13: 2.3.3 Equipment configurationFigure
Page 14 and 15: Skin injuries can occur when skin d
Page 16 and 17: couch height position when the cent
Page 18 and 19: This formula provides the idealised
Page 20 and 21: 3. Method3.1 Verification of Patien
Page 22 and 23: The field size was set to Mag 1 (20
Page 24 and 25: Further combined orientations were
Page 26 and 27: 70 183 67 60.7 +10.3%102 205 175 15
Page 28 and 29: Method 3 - Thermo Luminescent Dosim
Page 30: 13172125293337414549535761656973778
Page 33: 4.3.2 Simulated patient Skin Absorb
Page 37 and 38: further analysis work. An excerpt o
Page 39 and 40: Figure 29 : Intervention coronary e
Page 41 and 42: maximum skin dose to average dose 3
Page 43 and 44: of 29% 42 . Image quality assessmen
Page 45 and 46: always resulted in a reduction in d
Page 47 and 48: References1. NRPB W4 - Radiation ex
Page 49 and 50: 30. Theodorakou C and Horrocks J A,

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