Philips Compressed Sense
New Powerful Way to Accelerate MRI Scanning
The new Philips Compressed Sense allowes up to 50% acceleration of individual scans with high image quality. It is suitable for all anatomies and can be used for all anatomical contrasts, in both 2D and 3D. Visit Philips.com for more information about the technology.
Compressed sensing is a term from the field of digital signal processing. When a signal is digitally sampled, like it happens in an MRI scanner, the signal is not recorded continuously (like old cassette players used to do) but at intervals.
A famous theorem from digital signal analysis, the Nyquist theorem, states that for constructing a perfect MR image of 256 x 256 pixels, it is required to sample 256 lines in k-space, each sampled in 256 positions. By doing less, the acquisition will be faster, but the reconstructed image will always be distorted one way or another.
This is exactly what happens with traditional acceleration techniques in MRI, such as halfscan, radial, spiral, increased voxel size and parallel imaging. All of these methods skip parts of k-space during acquisition in order to reduce acquisition time. However, there will always be a penalty: either a reduced signal to-noise ratio (halfscan, parallel imaging), lower image resolution (increased voxel size) or image artifacts (spiral, radial).
Compressed SENSE is not different, but in practice it is often more forgiving than other acceleration techniques in terms of image distortion and SNR, because it can be designed to primarily sample the MR signals that matter most, while leaving out the rest.
Increased Productivity, Precision, and Patient Experience
The Philips’ Compressed SENSE was designed with the patient in mind. It can be used to create images with higher resolution in the same scan time that is currently allotted for exams to increase diagnostic confidence. The time saved can boost productivity by enabling more patients per day. Furthermore, by shortening breath hold scans, it enables patients who have compromised vascular compliance to more easily complete their examinations.