This presentation is about using Catphan 600 phantom for Quality Control in Computer Tomography CT

2. CATPHAN 500 & 600

3. CATPHAN 500 & 600

4. Mounting

7. CATPHAN 600

8. CATPHAN 600

9. CTP 404 Slice Geometry and Sensitometry Module

11. CTP 404

13. Phantom Alignment Align phantom dots with the lasers

17. Phantom Alignment Scan 6 or 8 axial slices with minimum slice width Start 3 or 4 slices before the zero position

19. Phantom oriented to right side

20. Phantom oriented to left side

21. Phantom Tilted

23. Aligned Image

24. How to verify ? Switch ON grid to check the Phantom Alignment

27. CUATION Once the phantom is centered and aligned DO NOT touch or move the phantom by hand Only move or align it by table movements

28. Test 1: LASER Accuracy Align the phantom to lasers by moving the table Align all the dots to X, Y and Z LASERS as precisely as possible Scan axially with minimum slice thickness If the Image is same as previous one then LASERS are perfectly aligned OTHERWISE !

29. Measurement of Z Axis Misalignment

30. Z-axis Misalignment Measure the distance between center of the phantom and center of the slice Multiple by 0.42 to find the z-axis misalignment 4.99 x 0.42 = 2.1 mm

31. X and Y Misalignment Switch ON grid and measure distance of the center of the grid to center of the image in X and Y direction and multiply by 0.42

32. X and Y Misalignment X = 4.61 x 0.42 1.9 mm Y = 3.26 x 0.42 1.4 mm

33. Test 2: Patient Alignment System Take Scanogram or Scout Take an axial Scan at the crosswire Measure the accuracy of the scan

36. Test 3: Circular Symmetry Take an axial Scan of the CTP 404 Image must be circular not elliptical Measure diameter of the phantom in X & Y Measure distance between Teflon pins Additionally angle accuracy can be verified

38. Distance Accuracy

39. Angle Accuracy

40. Test 4: Slice Width Accuracy Axially scan CTP 404 with different slice widths Measure slice with at (FWHM) ‏ Full Width at Half Maximum Slice Thickness = FWHM * 0.42

43. 6.00 * 0.42 = 2.52 mm

44. Test 5: Slice Sensitometry Scan the phantom with different slice widths Measure CT Numbers of Different samples

45. CTP 404

50. Volume Verification The volume of five spheres ????

51. CTP 591 Bead Geometry Module

59. CTP 528 High Resolution Module

62. High Resolution Measurements

65. CTP 515 Low Contrast Module

73. CTP 486 Uniformity Module

76. Artifact Analysis Change Window Width and level and observe any artifacts

77. Questions

78. Suggestions

79. Thanks