Compressed sensing (CS) is a signal processing technology that can reconstruct images with randomly under sampled sparse data. In MR imaging, CS has been applied to shorten the acquisition time in combination with various acceleration techniques [1,2]. Compressed SENSE (C-SENSE) is a novel CS technique that combination with phased array coils and current parallel imaging technique [3]. While this new C-SENCE technique has been reported to be very useful in 3D imaging in many literatures [4,5]. On the other hand, there are few reports on...

・We used the self-made phantoms simulating the head(Fig. 1). The structure of the self-made phantoms with various diameter (4,8,12mm) filled with various concentration of diluted Gd-chelate (0.25, 0,5, 1.0μmol/L), were placed in the fluid that simulated the gray matter (62.5 nmol / L)[7]. ・All phantoms were scanned at 1.5T MR unit, dsHeadNeck coil (inginia1.5T ,PHILLIPS Healthcare) with T1-weighted SE sequence, TR/TE : 400/10, matrix : 256x256(ZIP512), Slice Thickness : 5mm, WFS : 1.0, Scan percentage : 100%, NEX : 2, Denoising filter : Medium, Total...

・It is the result of quantitative analysis. The rate of change of FWHM tended to increase as the CS factor increased and concentration of Gd and diameter decrease (Fig. 3). However, when the concentration of Gd and diameter decrease, the dispersion was large and sometimes lower than the reference. SSIM tended to decrease as CS factor increase and concentration of Gd and diameter decrease (Fig. 4). The significance test was performed using Tukey’s multiple comparison test. (p

Quantitative and visual qualitative assessment revealed that the shape reproducibility of contrast-enhanced 2D-T1-weighted images using C-SENSE was influenced by the size and intensity of the Gd object.This result was also due to the fact that as the CS coefficient increases, random sampling approaches equidistant sampling, and yields coherent artefact increase (Fig. 8). The tendency of the experimental results obtained in this study suggests that the use of a contrast effect may provide sparsity even in 2D-T1-weighted images with low sparsity.

M. Tsukuda; Hyogo/JP - nothing to disclose S. Takahashi; Suita, OSAKA/JP - nothing to disclose H. Hiwatashi; Hyogo/JP - nothing to disclose A. Inakami; Hyogo/JP - nothing to disclose T. Washio; Hyogo/JP - nothing to disclose

[1] Michael Lusting”The Application of Compressed Sensing for Rapid MR imaging”Magnetic Resonance in Medicine 58-1182-1195(2007) [2] Hiroyuki Shinohara”Basics of compressed sensing MRI”Medical science company 2016.06.27 [3] Tarou Takahara”MRI applicable 3rd edition”MEDICAL VIEW 2016.10.10 [4] Evan Levine”3D cartesian MRI with compressed sensing and variable view sharing using complementary poisson-disc sampling”Magnetic Resonance in Medicine May 2017, volume 77,issue5 [5] S.Toledano-Massiah”Accuracy of the Compressed Sensing Accelerated 3D-FLAIR Sequence for the Detection of MS Plaque at 3T”American Journal of Neuroradiology March 2018,39(3)454-458 [6] Dong Liang”Accelerating SENSE Using Compressed Sensing”...