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Table 3 Computational times for pixel-wise mapping in the complete image and in a selected ROI, respectively

From: Validation of T1 and T2 algorithms for quantitative MRI: performance by a vendor-independent software

 

Pixel-wise (complete image)

Pixel-wise (ROI only)

T1 spin-echo IR (magnitude images)

2.5 s (3 parameters, 17 images, 128 × 128 images, 13 435 refined pixels)

0.03 s (3 parameters, 17 images, 200 pixels, 152 refined pixels)

T1 PSIR

11.7 s (3 parameters, 17 images, 192 × 144 matrix, 26 597 refined pixels)

0.15 s (3 parameters, 17 images, 200 pixels, 200 refined pixels)

T1 saturation recovery balanced SSFP

11.2 s (3 parameters, 15 images, 192 × 144 matrix, 26 594 refined pixels)

0.09 s (3 parameters, 15 images, 202 pixels, 202 refined pixels)

T1 MOLLI/T1 Look-Locker correction (magnitude and PSIR images)

6.4 s (3 parameters, 9 images, 192 × 144 matrix, 25 128 refined pixels)

0.05 s (3 parameters, 9 images, 202 pixels, 198 refined pixels)

T2 spin echo (single-echo and multi-echo)

1.12 s (2 parameters, 15 images, 128 × 128 matrix, 9 175 refined pixels)

0.04 s (2 parameters, 15 images, 207 pixels, 160 refined pixels)

T2-prepared balanced SSFP

11.7 s (3 parameters, 37 images, 192 × 144 matrix, 16 322 refined pixels)

0.14 s (3 parameters, 37 images, 207 pixels, 184 refined pixels)

  1. The ROI-based global mean fitting takes less than 2 s for all sequences and is not listed. Performance was tested at a 2.4 GHz, 8 GB RAM, SSD HDD standard laptop running the MS Windows 7 64-bit operating system
  2. IR inversion recovery, PSIR phase sensitive inversion recovery, MOLLI modified Look-Locker inversion recovery, SSFP steady-state free precession