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0.23T Panorama T1w FFE fat suppression with Dixon method

ExamCard
Syrenius, Paula Philips Healthcare Philips Global

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Introduction

Three-point Dixon is included in release 6.2. With this, we introduced possibilities to scan T2*- weighted, fat-suppressed images in MSK applications. You will find those sequences in the New Methods folder. 

 

The 3pt Dixon method makes it possible to scan T1-weighted images with fat suppression. This is especially important in examinations using contrast agent.

 

What is the Dixon method?

It separates fat and water components in images based on the fat-water frequency difference which is 34 Hz at 0.23T. The frequency difference causes fat and water spins to precess over a different phase angle in a given time. The sequence collects echoes with different echo times.

 

The Dixon sequence collects 3 echoes with different echo times. It produces three image types: fat, water, and combined images. The last image type corresponds to images acquired using normal FFE with 3 averages. Note that also the third echo contributes to the contrast. This can be seen in the anatomies with intermediate T2-relaxation values in the range of 30-60 ms.

 

Water/fat separation by the Dixon method is sensitive to SNR. A reduced SNR may lead to misregistered voxels. A warning is displayed if the user has reduced SNR below ensured limit.

 

 

ExamCard Overview

T1w Fatsuppression Dixon
Scan 1Shoulder 4 mm
Scan 2Knee, ankle 4 mm
Scan 3L-Spine 5 mm
Scan 4Wrist, elbow 3.5 mm
Scan 5Pelvis 5 mm

Example Images

T2* Dixon Orbit Tra Slice thickness 3.5 mm<br>
Scan time 7:17 min.<br>
Courtesy of Givision, SwitzerlandT1 Dixon Shoulder Tra Slice thickness 4 mm<br>
Scan time: 5:49 min.T1 Dixon Pediatric Knee Tra C+ Slice thickness 3 mm<br>
Scan time: 6:47 min.<br>
Courtesy of Rheumathoid Foundation Hospital Heinola, Finland
T2* Dixon Orbit Tra
T1 Dixon Shoulder Tra
T1 Dixon Pediatric Knee Tra C+
Slice thickness 3.5 mm
Scan time 7:17 min.
Courtesy of Givision, Switzerland
Slice thickness 4 mm
Scan time: 5:49 min.
Slice thickness 3 mm
Scan time: 6:47 min.
Courtesy of Rheumathoid Foundation Hospital Heinola, Finland
T1 Dixon Ankle Sag Slice thickness 4 mm<br>
Scan time: 5:49 min.T1 Dixon Foot Tra  NoC Slice thickness 4 mm<br>
Scan time: 4:43 min.<br>
Courtesy of Copenhagen University Hospital, Herlev, DenmarkT1 Dixon Foot Tra C+ Slice thickness 4 mm<br>
Scan time: 4:43 min.<br>
Courtesy of Copenhagen University Hospital, Herlev, Denmark
T1 Dixon Ankle Sag
T1 Dixon Foot Tra NoC
T1 Dixon Foot Tra C+
Slice thickness 4 mm
Scan time: 5:49 min.
Slice thickness 4 mm
Scan time: 4:43 min.
Courtesy of Copenhagen University Hospital, Herlev, Denmark
Slice thickness 4 mm
Scan time: 4:43 min.
Courtesy of Copenhagen University Hospital, Herlev, Denmark
T1 Dixon L-Spine Sag with REST slab Slice thickness 5 mm<br>
Scan time: 6:31 min.T1 Dixon Knee Cor Slice thickness 4 mm<br>
Scan time 5:49 min. <br>
T1 Dixon L-Spine Sag with REST slab
T1 Dixon Knee Cor
Slice thickness 5 mm
Scan time: 6:31 min.
Slice thickness 4 mm
Scan time 5:49 min.


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ExamCard
Panorama 0.23T
Release 6
Standard
Ankle, Foot, Hip, Knee, Lumbar spine, Musculoskeletal, Neuro, Orbit, Shoulder, Wrist
 

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