chap 6 accelerated k-space filling - universitetet i oslo · chap 6 accelerated k-space filling –...
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![Page 1: CHAP 6 Accelerated k-space filling - Universitetet i oslo · CHAP 6 Accelerated k-space filling – Rapid Acquisition of repeated echoes (RARE / FSE, TSE) – Echo Planar Imaging](https://reader031.vdocument.in/reader031/viewer/2022011915/5fc5680679dda56f0d285519/html5/thumbnails/1.jpg)
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
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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
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FSE/TSE k-space filling
TSE – Effective Echo Time
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TSE – echo modulation
TSE – echo modulation
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TSE – different profile orders
•
•
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TSE / Linear k-space filling
TSE / Centric k-space filling
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TSE
ETL=11 ETL=256
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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
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GRE-EPI
SE-EPI
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Artifacts in EPI
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Artifacts in EPI
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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
![Page 13: CHAP 6 Accelerated k-space filling - Universitetet i oslo · CHAP 6 Accelerated k-space filling – Rapid Acquisition of repeated echoes (RARE / FSE, TSE) – Echo Planar Imaging](https://reader031.vdocument.in/reader031/viewer/2022011915/5fc5680679dda56f0d285519/html5/thumbnails/13.jpg)
Spiral Imaging
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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
![Page 15: CHAP 6 Accelerated k-space filling - Universitetet i oslo · CHAP 6 Accelerated k-space filling – Rapid Acquisition of repeated echoes (RARE / FSE, TSE) – Echo Planar Imaging](https://reader031.vdocument.in/reader031/viewer/2022011915/5fc5680679dda56f0d285519/html5/thumbnails/15.jpg)
TR*(T12-T1
1)/(T11T1
2)
Use of magnetization preparation
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Inv-GRE (MPRAGE) / Linear
Inv-GRE (MPRAGE) / Centric
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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
![Page 19: CHAP 6 Accelerated k-space filling - Universitetet i oslo · CHAP 6 Accelerated k-space filling – Rapid Acquisition of repeated echoes (RARE / FSE, TSE) – Echo Planar Imaging](https://reader031.vdocument.in/reader031/viewer/2022011915/5fc5680679dda56f0d285519/html5/thumbnails/19.jpg)
Selective tissue suppression
Example of brain tumour
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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
![Page 21: CHAP 6 Accelerated k-space filling - Universitetet i oslo · CHAP 6 Accelerated k-space filling – Rapid Acquisition of repeated echoes (RARE / FSE, TSE) – Echo Planar Imaging](https://reader031.vdocument.in/reader031/viewer/2022011915/5fc5680679dda56f0d285519/html5/thumbnails/21.jpg)
Look-Locker sequence
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Sequence overview