1. 대구가톨릭대학병원 영상의학과 이 영 환 M M R R Basic Physics

2. MR Signal T1-, T2-weighted TR, TE MR Signal T1-, T2-weighted TR, TE

3. Radiography, CT X-ray Penetration

4. Ultrasonography Ultrasound Reflection

5. MRI ? RF Pulse

6. H 1111 Resonance Surface Coil

7. N S + H 1111 Magnetic Dipole

9. N S Magnetization

10. Magnetic Strength Gauss Tesla 1 Tesla = 10,000 Gauss

11. N S Precession

12. Precession N S

13. Resonance Precession frequency Larmor frequency   B0B0B0B0  B0B0B0B0

14. Frequency (MHz) 10 -4 10 2 8 14 10 20 Radio Visible light X-rays Gamma rays Cosmic rays MR Electromagnetic Wave Microwave

16. Surface Coil

18. N S N S Z Y X

19. N S N S Z Y X

20. N S N S

21. Z Y X N S Y X Z N S Longitudinal Magnetization Transverse Magnetization

22. Z Y X N S Y X Z N S Longitudinal Magnetization Transverse Magnetization

23. Effect of RF Pulse Loss of longitudinal M. Creation of transverse M. –In Phase

24. Z Y X Y X Z MR Signal

25. T1-, T2-weighted TR, TE MR Signal T1-, T2-weighted TR, TE

26. Resonance E2E2 E1E1 ; Induction of transition between two energy states

27. N S N S

28. N S N S Relaxation

29. Y X Z Y X Z Relaxation

30. Relaxation T1 Relaxation T2 Relaxation ; Process determining return to equilibrium of both longitudinal & transverse magnetization

31. T1 Relaxation N S N S

32. N S N S Z Y X

33. Longitudinal Magnetization Time

34. N S T2 Relaxation N S

35.   B0B0B0B0

36. Transverse magnetization T2 Relaxation Time

37. N S N S Relaxation

38. Y X Z Y X Z Relaxation

39. Transverse magnetization T2 Relaxation Time

40. Transverse magnetization T2 Relaxation Time TE

41. T2 Contrast Time Short T2 Tissue Long T2 Tissue

42. T2-weighted Time Short T2 Tissue Long T2 Tissue Long TE

43. TE ; 28 msecTE ; 90 msecTE ; 230 msec TR ; 3000 msec

44. Spatial Localization

45. TE TR

46. T1 Relaxation Longitudinal Magnetization Time

47. T1 Contrast Time Short T1 Tissue Long T1 Tissue

48. T1-weighted Time Short T1 Tissue Long T1 Tissue Short TR

49. TR ; 150 msecTR ; 500 msecTR ; 1500 msec

50. 120 - 60 40 - 10 300 - 8001500 - 4000 TR (msec) TE (msec) Spin Echo Poor contrast Poor S/N Poor contrast Poor S/N T2 ?T1

51. TR 3000 msec, TR 28 msec

53. 120 - 60 40 - 10 300 - 8001500 - 4000 TR (msec) TE (msec) Spin Echo Poor contrast Poor S/N Poor contrast Poor S/N T2 ProtonT1?

54. Normal Tissue Proton Density T1 T2 Lesion Proton Density T1 T2 Normal Tissue Lesion IntrinsicTissueContrast TRTENEXMatrixFOV Slice Thickness Magnetic Strength Pulse Sequence....TRTENEXMatrixFOV Slice Thickness Magnetic Strength Pulse Sequence....ExtrinsicImagingParametersImageContrast

55. MR Signal T1-, T2-weighted TR, TE   B0B0B0B0

56. 감사합니다