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3.0T dynamic liver imaging

ExamCard
Jones, Alun Philips Healthcare Philips Global

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This ExampleCard gives a series of scans designed for liver imaging on 3.0T including a 4-phase dynamic contrast study using the THRIVE technique.

 

This ExampleCard provides a series of scans designed to show the liver in both T1 and T2 weighting with and without fat suppression to assist in the detection of liver lesions. The scans shown are using the SENSE Torso coil. The PEAR respiration belt is used for respiratory triggering to allow many of the sequences to be performed with the patient breathing normally, allowing the sequences to be used with all patients. SENSE or CLEAR are used on all the sequences allowing high resolution imaging with very even signal intensity across the whole field of view.

 

All the elements of RF SMART are used for SAR control and optimal image quality, with SPAIR fat suppression being used for uniform fat suppression.

ExamCard overview

Liver_dynamic
Scan 1Survey
Scan 2Ref Scan
Scan 3sSSh TE80
Scan 4sSSH SPAIR
Scan 5bTFE
Scan 6T1 TFE
Scan 7THRIVE dynamic

ExamCard image steps

sSSh TE80 A single shot scan acquired with the patient breathing normally. Each time the patient breathes out a single slice is acquired and due to the very short acquisition time of 350 ms the motion is frozen giving motion free images. This sequence use SENSE to reduce the TSE factor (echo train length) avoiding the blurring often associated with single shot imaging and uses the body tuned option to compensate for di-electric effects.sSSh SPAIR This is also a single shot scan which uses the same features as sSSh TE80 but with the addition of SPAIR fat suppression for homogenous fat suppression. The amount of fat suppression can be modified by changing the SPAIR delay time.bTFE A balanced TFE sequence giving high signal from fluids such as blood vessels. This sequence can be performed either with the patient free breathing or as a breath hold sequence. The scan uses a scan % of more than 100% and then a lower phase matrix to keep the TR as short as possible, reducing the presence of artefacts. Body tuned CLEAR is used to compenstae for any di-electric effects.
sSSh TE80
sSSh SPAIR
bTFE
A single shot scan acquired with the patient breathing normally. Each time the patient breathes out a single slice is acquired and due to the very short acquisition time of 350 ms the motion is frozen giving motion free images. This sequence use SENSE to reduce the TSE factor (echo train length) avoiding the blurring often associated with single shot imaging and uses the body tuned option to compensate for di-electric effects.
This is also a single shot scan which uses the same features as sSSh TE80 but with the addition of SPAIR fat suppression for homogenous fat suppression. The amount of fat suppression can be modified by changing the SPAIR delay time.
A balanced TFE sequence giving high signal from fluids such as blood vessels. This sequence can be performed either with the patient free breathing or as a breath hold sequence. The scan uses a scan % of more than 100% and then a lower phase matrix to keep the TR as short as possible, reducing the presence of artefacts. Body tuned CLEAR is used to compenstae for any di-electric effects.
T1 TFE A T1 weighted TFE sequence designed to be acquired with the patient breathing normally with a single slice acquired each time the patient breathes out. The sequence contains a inversion pulse with a defined delay time to give optimal T1 contrast. This value can be modified to allow different T1 weighting to be obtained.THRIVE_dynamic A 4 phase dynamic study using the THRIVE technique. THRIVE is an isotropic 3D fat suppressed sequence designed to be used post contrast injection. The sequence is a breath hold acquisition with typically 100 2x2x2 mm slices being acquired in 15 seconds. Due to the isotropic nature of the sequence the images can be reconstructed in any plane and also MIP reconstructions can be performed of blood vessels. THRIVE uses SPAIR fat suppression.
T1 TFE
THRIVE_dynamic
A T1 weighted TFE sequence designed to be acquired with the patient breathing normally with a single slice acquired each time the patient breathes out. The sequence contains a inversion pulse with a defined delay time to give optimal T1 contrast. This value can be modified to allow different T1 weighting to be obtained.
A 4 phase dynamic study using the THRIVE technique. THRIVE is an isotropic 3D fat suppressed sequence designed to be used post contrast injection. The sequence is a breath hold acquisition with typically 100 2x2x2 mm slices being acquired in 15 seconds. Due to the isotropic nature of the sequence the images can be reconstructed in any plane and also MIP reconstructions can be performed of blood vessels. THRIVE uses SPAIR fat suppression.

Patient preparation

The patient is positioned supine in the SENSE Torso coil. The PEAR respiration belt should be placed on the patients abdomen under the coil.

Post-processing / analysis:

MPR and MIP reconstructions can be performed on the THRIVE dynamic sequence as well as subtraction of the pre-contrast phase from the post contrast phases to allow better visualization of the contrast uptake.


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Nov 25, 2004

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ExamCard
Achieva 3.0T
Release 1
Quasar Dual
Body, Liver
 

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