NetForum uses cookies to ensure that we give you the best experience on our website. If you continue to use the site, we'll assume that you are happy to receive these cookies on the NetForum website. Read about our cookies.
NetForum Community
Learn. Share. Optimize.
Log in | Sign up now | Submit content | Contact
Go to similar content

Utrecht quickly demonstrates power of first clinical Achieva 1.5T

Clinical News
van Leeuwen, Maarten, MD Utrecht, University Medical Center Netherlands
Nievelstein, Rutger-Jan, M.D. Utrecht, University Medical Center Netherlands
Witkamp, Theo, MD Utrecht, University Medical Center Netherlands
van der Lee, Marja, R.T. Utrecht, University Medical Center Netherlands
Bouwman, Greet, R.T. Utrecht, University Medical Center Netherlands

 

With its powerful 32-channel scalable FreeWave architecture, Philips' new Achieva 1.5T extends the boundaries of MRI with new applications, for example through next-generation SENSE functionality, new multi-channel SENSE coils, and sub-ms TRs. Besides expanding clinical frontiers, Achieva also enhances workflow with its new ExamCards. Since March, University Medical Center (UMC) Utrecht radiologists have experienced Achieva's power in the initial 500 studies. They note that THRIVE abdomen, knee, MRA and diffusion-weighted studies have been especially impressive.

 The Utrecht MR team: Maarten van Leeuwen, M.D,. Rutger-Jan Nievelstein, M.D.,Theo Witkamp, M.D., Marja van der Lee, Greet Bouwman.University Medical Center Utrecht Achieva 1.5T
University Medical Center Utrecht
Achieva 1.5T
The Utrecht MR team: Maarten van Leeuwen, M.D,. Rutger-Jan Nievelstein, M.D.,Theo Witkamp, M.D., Marja van der Lee, Greet Bouwman.

In Utrecht Medical Center's first Achieva 1.5T studies - MRA, DWI, THRIVE and knee examinations - the system's multichannel FreeWave architecture is making its impact known. "These initial applications show the influence of sub-ms TR, especially in MRA studies, and the impact of the multi-channel architecture on SNR, scan time, and resolution," says radiologist Maarten van Leeuwen, M.D. "Usually it's a trade-off among those criteria, but with Achieva, the whole curve has shifted upward while maintaining the same scan time."

 

So far, 70% of scans have been brain and spine studies, 15% abdominal and 15% musculoskeletal examinations.

FreeWave and multi-channel SENSE

In MRA of the cerebrovasculature, Utrecht clinicians are using Achieva's 8-channel SENSE Head coil to conduct 3D phase contrast studies. "On our previous system, 3D phase contrast took too much time," Dr. van Leeuwen says. "What we've seen with 3D phase contrast on Achieva - particularly in combination with contrast agent - has been very promising. 3D time-of- flight has also been good."

 

The SENSE Head coil has also greatly improved diffusion-weighted imaging, adds radiologist Rutger-Jan Nievelstein, M.D. "The SNR is higher and the detail is significantly clearer with much less blurring," he notes. "You can much more easily identify the location of the lesion with respect to normal anatomy."

 

Utrecht clinicians eagerly anticipate employing Philips' new 16-channel Neurovascular coil with Achieva, in detailed 3D phase contrast studies of the circle of Willis and carotid circulation - key areas of investigation at the medical center.

 

"Currently, if you have about 30 minutes for a comprehensive brain examination, you have to prioritize how much time you want to spend on a particular part of that study - whether it be the diffusion-weighted imaging, MRA or brain structural scanning," he observes. "With Achieva there's much less sacrifice, so we can obtain better quality and more information in the same time slot."

 

According to radiologist Theo Witkamp, M.D., the new 8-channel SENSE Knee coil is providing a dramatic SNR boost for joint studies. "With this coil, the images are fantastic," Dr. Witkamp says. "The cartilage is especially impressive - with high detail and the ability to very easily see small chondral lesions. The standard I've seen from Achieva is clearly better than what I've seen on a regular 1.5T system. This looks very promising for routine knee studies."

 

While Philips' 3D THRIVE technique has provided remarkable results in fast highresolution, large FOV abdominal imaging on the Intera 1.5T platform, the sequence works even better with Achieva 1.5T, according to Dr. Nievelstein. "We've used 3D THRIVE on Achieva to image liver lesions and are impressed by its combined spatial and contrast resolution," he says.

 

Utrecht clinicians plan to exploit the many other new techniques that Achieva brings, such as MobiFlex for peripheral angio, IView BOLD (for real-time evaluation of brain activity), SpectroView, and DTI.

ExamCards streamline workflow

Achieva raises MR to new levels of operational efficiency. Its ExamCards enhance workflow by delivering an integrated sequence of protocols for a complete examination, at a single touch.

 

"ExamCards are very powerful and will make scanning tremendously easier," says technologist Greet Bouwman. "Setting up an examination needs far fewer operator actions, they prevent mistakes (e.g. wrong or overlooked scan) and training is much easier. Your ExamCards are grouped under a larger file, such as Head CNS, and you get a clear overview of scans in a particular brain study, Standard Brain, for example. It's really intuitive. In addition, using NetForum to electronically exchange ExamCards with other users and Philips is a great idea."

 

"We also like SameScan," adds technologist Marja van der Lee. "It lets us quickly repeat a patient's previous exam with exactly the same planning and scan parameters. That saves a great deal of time and optimizes the results."


Example 1

A 41-year-old female with a large hemangioma in upper abdomen was referred to MRI to examine compression on the vena cava. MRI was performed with SENSE Body coil. High-resolution B-TFE, breath hold (left) and THRIVE, 5 phases, 2 mm3 voxels, 16 seconds per dynamic.
B-TFE THRIVE, 5 phases
B-TFE
THRIVE, 5 phases

Example 2

A 62-year-old male patient with myelitis, radiculitis. TSE, 1024 matrix.
Pre contrast    Post contrast
Pre contrast Post contrast

Example 3

A 3-year-old girl with epileptic seizures. Frontal lobe gray-matter heterotopia. MRI was performed with the 8-channel SENSE Head coil. TFE with 1 mm3 isometric resolution. DTI with 16 different directions, 2 mm3 isometric resolution.
TFE (MPR) DTI (FA)
TFE (MPR)
DTI (FA)


This content has been made possible by NetForum Community.
Share this on: Share your link in twitter Share your link in facebook Share your link on LinkedIn Print Rate this article: Log in to vote

 
Rating:
Votes:
0
Views:
1587
Added:
Nov 18, 2004

Rate this:
Log in to vote
 

Clinical News
 

Clinical News
Best Practices
Case Studies
Publications and Abstracts
White Papers
Web seminars and Presentations
ExamCards
Protocols
Application Tips and FAQ
Training
Try an Application
Business News
Case Studies
White Papers
Web Seminars and Presentations
Utilization Services
Contributing Professionals
Contributing Institutions
Become a Contributor