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Breast imaging update for Extension Package R2 (R2.5)

Application Tip
Rijckaert, Yvonne Philips Healthcare Philips Global

This Application Tip provides an update on new features enabled by Extension Package R2 (R2.5) and related to breast imaging.

Manual adjustment of F0 determination

F0, as determined by the system, can now be manually adjusted, if necessary. After the preparation phases of a fat suppressed scan, a pop-up window shows the peaks found.

Usually, two peaks are shown: water and fat. A vertical red line indicates F0 as automatically determined by the system. Note that the horizontal frequency axis of the spectrum has positive values on the left side of 0 and negative values on the right side of 0. Consequently, the water peak is left (higher frequency) from the fat peak.


If the F0 is not positioned on the water peak, the required offset value can be determined from the spectrum. NOTE: This will be a positive value if the F0 is on the right peak. Enter the offset value at the 'manual offset frequency' parameter on the 'postproc' parameter page.


Select 'auto' for the 'preparation phases' parameter on the 'postproc' page, such that the manually determined F0  is automatically reused in following scans.

At 3.0T, the parameter 'manual offset frequency' must be set to 'apply' in order to take over the manually determined F0 to following scans.


A (fat suppressed) breast ExamCard comes with Extension Package R2 (R2.5) that makes use of this feature.

Pop-up window showing peaks found
Pop-up window showing peaks found


4D THRIVE combines high resolution and short dynamic scan times

Acquisition of high resolution 3D isotropic scans is now enabled in short dynamic scan times by a technique called '4D THRIVE'. It uses sharing of K-space profiles between dynamics (keyhole technique).


The implementation is very flexible, such that the dynamic scheme can be optimized to a user's needs. It is recommended to combine only profiles from dynamics that are not too far apart in time.


A dedicated breast ExamCard is delivered with Extension Package R2 (R2.5). It combines high spatial resolution (1 mm³) with dynamic scan times of either 1 minute for a full acquisition or only 15 seconds for keyhole scans of the same resolution (1 mm³).



CENTRA profile order

In Extension Package R2 (R2.5), CENTRA - a 3D centric K-space ordering technique - is introduced for fat suppressed TFE sequences. It fills the central part of K-space first, followed by the K-space periphery in the later phase.


CENTRA is integrated in 4D THRIVE, but it can also be used for non-dynamic, fat suppressed 3D TFE sequences.


Optimized fat suppression

For breast imaging, SPAIR is the recommended fat suppression method because of its insensitivity to B1 effects. In this release, a stronger SPAIR prepulse is available to enable further optimization of fat suppression. Two versions of SPAIR can now be selected: power 1 or power 2. For breast imaging we recommend to always use SPAIR power 2, the stronger version of SPAIR. This will typically polish fat suppression on the lateral side of the right breast.




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Aug 24, 2007

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Application Tip
Achieva 1.5T, Achieva 3.0T, Achieva 3.0T X-series
Release 2.5
Nova, Nova Dual, Pulsar, Quasar, Quasar Dual
Body, Breast, Women's health

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