Reduction of procedure times in routine clinical practice with Compressed SENSE magnetic resonance imaging technique

Abstract

Objectives Acceleration of MR sequences beyond current parallel imaging techniques is possible with the Compressed SENSE technique that has recently become available for 1.5 and 3 Tesla scanners, for nearly all image contrasts and for 2D and 3D sequences. The impact of this technique on examination timing parameters and MR protocols in a clinical setting was investigated in this retrospective study. Material and methods A numerical analysis of the examination timing parameters (scan time, exam time, procedure time, interscan delay time, changeover time, nonscan time) based on the MR protocols of 6 different body regions (brain, knee, lumbar spine, breast, shoulder) using MR log files was performed and the total number of examinations acquired from January to April both in 2017 and 2018 on a 1.5 T MR scanner was registered. Percentages, box plots and unpaired two-sided t tests were obtained for statistical evaluation. Results All examination timing parameters of the six anatomical regions analysed were significantly shortened after implementation of Compressed SENSE. On average, scan times were accelerated by 20.2% (p<0.0001) while procedure times were shortened by 16% (p<0.0001). Considering all anatomical regions and all MR protocols, 27% more examinations were performed over the same 4 month period in 2018 compared to 2017. Conclusion Compressed SENSE allows for a significant acceleration of MR examinations and a considerable increase in the total number of MR examinations is possible.

Breath-hold and free-breathing quantitative assessment of biventricular volume and function using compressed SENSE: a clinical validation in children and young adults

“…With the goal of accelerating SENSE, a compressed sensitivity encoding (C-SENSE) algorithm was developed that employs a pseudorandom undersampling of k-space in the spatial domain. C-SENSE provides diagnostic CMR image quality with acceleration factors greater than 2, allowing for significantly reduced BH times [29]. However, there is little data validating quantitative ventricular assessment using C-SENSE either with BH or FB acquisitions [30].…”

Comparison of image quality of head and neck lesions between 3D gradient echo sequences with compressed sensing and the multi-slice spin echo sequence

“…Since, both the observers provided quite high grades for these four parameters, the skewed distribution of the data eventually resulted in fair or moderate kappa values. We employed 3D scans with CS because there is more room for aggressive undersampling compared to 2D scans (12), and 3D imaging is particularly attractive as it is often time-consuming and reduction of scan time is a higher priority than 2D imaging. 3D imaging enables us to reconstruct the sagittal and coronal plane images from the original axial plane images.…”

“…For example, the compressed SENSE is available on the Philips scanner (11). According to the report by Sartoretti et al (12), in individual scans of six different body regions (brain, knee, lumbar spine, wrist, breast, shoulder) with compressed SENSE, a reduction in acquisition time of 23%-43% in individual sequences across 2D and 3D scans was achieved with no image degradation.…”

The exomoon corridor: Half of all exomoons exhibit TTV frequencies within a narrow window due to aliasing

“…Whilst the first three are broadly designed to be diffuse, uninformative distributions, the last one encodes a selection bias effect that we are more likely to detect wider orbit moons, since the TTV amplitude is itself proportional to a S (Sartoretti & Schneider 1999).…”

“…One of the first methods proposed to look for moons of extrasolar planets, exomoons, is through transit timing variations (TTVs; Sartoretti & Schneider 1999). The amplitude of these variations is proportional to satellite-to-planet mass ratio, (M S /M P ), multiplied by the moon's semi-major axis (a S ), and can anywhere from less than a second to up to an hour (Kipping & Teachey 2020).…”