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Magnet Gradient Coil RF Coil
Source: Joe Gati, photos
RF Coil
3T magnet
gradient coil
(inside)
Các thành ph n máyầ
x 60,000 =
T tr ng B0ừ ườ
Source: www.spacedaily.com
B0
Robarts Research Institute 3T
S an toànự
Source: www.howstuffworks.com Source: http://www.simplyphysics.com/flying_objects.html
Proton thẳng hàng trong B0
longitudinal
axis
Phát sóng RF
ELECTROMAGNETIC WAVES
RELAXATION - T1
T1 and TR
Source: Mark Cohen’s web slides
T1 = recovery of longitudinal magnetization (B0)
due to realignment of spins
TR ...
RELAXATION - T2
T2 and TE
Source: Mark Cohen’s web slides
T2 = decay of transverse (B1)magnetization
due to dephasing of spins
TE (time to...
Ghi nhận sóng cộng hưởng từ
K-SPACE
K-SPACE
To take away
Tissue protons align
with magnetic field
(equilibrium state)
RF pulses
Protons absorb
RF energy
(excited stat...
PULSE SEQUENCE DIAGRAM
Spin Echo Sequence
T1-WEIGHTED IMAGE
T2-WEIGHTED IMAGE
STIR AND FLAIR
STIR (Short Time Inversion Recovery):
FLAIR (Fluid Attenuated Inversion Recovery)
Màu s c môắ
• N c và mô b nh lýướ ệ
– Tr ng trên T2ắ
– Đen trên T1.
– Mô b nh lý v n tr ng trên FLAIRệ ẫ ắ
• M :ỡ
– Tr ng ...
Màu s c môắ
• U: tăng sinh m ch máu:ạ
– Tr ng trên gadoliniumắ
• T máu: thay đ i theo th i gianụ ổ ờ
• T y x ng: ch y u là...
Màu s c môắ
• T1 : N c đenướ
• T2 : Tr ng: N c, viêmắ ướ
• STIR- T2:
– M đenỡ
• Proton Density
– s n: xámụ
• Gadolinium en...
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  1. 1. Magnet Gradient Coil RF Coil Source: Joe Gati, photos RF Coil 3T magnet gradient coil (inside) Các thành ph n máyầ
  2. 2. x 60,000 = T tr ng B0ừ ườ Source: www.spacedaily.com B0 Robarts Research Institute 3T
  3. 3. S an toànự Source: www.howstuffworks.com Source: http://www.simplyphysics.com/flying_objects.html
  4. 4. Proton thẳng hàng trong B0 longitudinal axis
  5. 5. Phát sóng RF
  6. 6. ELECTROMAGNETIC WAVES
  7. 7. RELAXATION - T1
  8. 8. T1 and TR Source: Mark Cohen’s web slides T1 = recovery of longitudinal magnetization (B0) due to realignment of spins TR (time to repetition) = time to wait after excitation before sampling T1 = time before next RF excitation
  9. 9. RELAXATION - T2
  10. 10. T2 and TE Source: Mark Cohen’s web slides T2 = decay of transverse (B1)magnetization due to dephasing of spins TE (time to echo) = time to wait before sampling T2
  11. 11. Ghi nhận sóng cộng hưởng từ
  12. 12. K-SPACE
  13. 13. K-SPACE
  14. 14. To take away Tissue protons align with magnetic field (equilibrium state) RF pulses Protons absorb RF energy (excited state) Relaxation processes Protons emit RF energy (return to equilibrium state) Spatial encoding using magnetic field gradients Relaxation processes NMR signal detection Repeat RAW DATA MATRIX Fourier transform IMAGE Magnetic field Source: Jorge Jovicich Kwong et al., 1992
  15. 15. PULSE SEQUENCE DIAGRAM Spin Echo Sequence
  16. 16. T1-WEIGHTED IMAGE
  17. 17. T2-WEIGHTED IMAGE
  18. 18. STIR AND FLAIR STIR (Short Time Inversion Recovery): FLAIR (Fluid Attenuated Inversion Recovery)
  19. 19. Màu s c môắ • N c và mô b nh lýướ ệ – Tr ng trên T2ắ – Đen trên T1. – Mô b nh lý v n tr ng trên FLAIRệ ẫ ắ • M :ỡ – Tr ng trênT1 và T2ắ – Đen trên STIR và ngoài phase
  20. 20. Màu s c môắ • U: tăng sinh m ch máu:ạ – Tr ng trên gadoliniumắ • T máu: thay đ i theo th i gianụ ổ ờ • T y x ng: ch y u là mủ ươ ủ ế ỡ – Tr ng trên T1ắ – Tr ng trên T2ắ – Thay đ i khi phù hay b nh lýộ ệ • Th ng đen trên T1ườ • V x ng, s i, dây ch ngỏ ươ ỏ ằ – Đen trên t t c các xungấ ả – D p b nh lý thì tr ngậ ệ ắ
  21. 21. Màu s c môắ • T1 : N c đenướ • T2 : Tr ng: N c, viêmắ ướ • STIR- T2: – M đenỡ • Proton Density – s n: xámụ • Gadolinium enhanced: T1 – Máu sáng – M đenỡ – Mô b nh sángệ
  • NguyenLoc35

    May. 26, 2019

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