CHAP 6 Accelerated k-space filling – Rapid Acquisition of repeated echoes (RARE / FSE,
TSE)
– Echo Planar Imaging (EPI)
– Joy riding in k-space
CHAP 7 Magnetization preparation – Principles
– Selective tissue suppression
– Influence of the excitation pulse on magnetization curve
CHAP 8 Image quality, SNR, CNR – Introduction
– K-space filling strategies
Accelerated k-space filling
Simple SE sequence
TE
TR
FID SE
90°
180°
T2
Dead time
90°
Secondexcitation
Rapid Acquisition with Relaxation
Enhancement (RARE) / FSE or TSE
1st echo90°
180° 180° 180°
TE1TE2
TE3TR
90°
180°
2nd echo 3rd echo 1st echo
Secondexcitation
FSE/TSE k-space filling
TSE – Effective Echo Time
TSE – echo modulation
TSE – echo modulation
TSE – different profile orders
•
•
TSE / Linear k-space filling
TSE / Centric k-space filling
TSE
ETL=11 ETL=256
CHAP 6 Accelerated k-space filling – Rapid Acquisition of repeated echoes (RARE / FSE,
TSE)
– Echo Planar Imaging (EPI)
– Joy riding in k-space
CHAP 7 Magnetization preparation – Principles
– Selective tissue suppression
– Influence of the excitation pulse on magnetization curve
CHAP 8 Image quality, SNR, CNR – Introduction
– K-space filling strategies } } } } } } }
GRE-EPI
GRE-EPI
SE-EPI
Artifacts in EPI
Artifacts in EPI
Eddy Current effect
CHAP 6 Accelerated k-space filling – Rapid Acquisition of repeated echoes (RARE / FSE,
TSE)
– Echo Planar Imaging (EPI)
– Joy riding in k-space
CHAP 7 Magnetization preparation – Principles
– Selective tissue suppression
– Influence of the excitation pulse on magnetization curve
CHAP 8 Image quality, SNR, CNR – Introduction
– K-space filling strategies
Spiral Imaging
Spiral Imaging
CHAP 6 Accelerated k-space filling – Rapid Acquisition of repeated echoes (RARE / FSE,
TSE)
– Echo Planar Imaging (EPI)
– Joy riding in k-space
CHAP 7 Magnetization preparation – Principles
– Selective tissue suppression
– Influence of the excitation pulse on magnetization curve
CHAP 8 Image quality, SNR, CNR – Introduction
– K-space filling strategies
TR*(T12-T1
1)/(T11T1
2)
Use of magnetization preparation
Inv-GRE (MPRAGE) / Linear
Inv-GRE (MPRAGE) / Centric
CHAP 6 Accelerated k-space filling – Rapid Acquisition of repeated echoes (RARE / FSE,
TSE)
– Echo Planar Imaging (EPI)
– Joy riding in k-space
CHAP 7 Magnetization preparation – Principles
– Selective tissue suppression
– Influence of the excitation pulse on magnetization curve
CHAP 8 Image quality, SNR, CNR – Introduction
– K-space filling strategies
Selective tissue suppression
Example of brain tumour
CHAP 6 Accelerated k-space filling – Rapid Acquisition of repeated echoes (RARE / FSE,
TSE)
– Echo Planar Imaging (EPI)
– Joy riding in k-space
CHAP 7 Magnetization preparation – Principles
– Selective tissue suppression
– Influence of the excitation pulse on magnetization curve
CHAP 8 Image quality, SNR, CNR – Introduction
– K-space filling strategies
Look-Locker sequence
Sequence overview