Article Figures & Data
Figures
- Fig 1.
Dual-echo high resolution t-PEPSI sequence (TR/TE1/TE2/NEX = 5000/50/145/1, flip angle = 90°).
A, First-echo image obtained shows good lesion-to-tissue contrast.
B, Second image in the same shot is not of satisfactory quality for lesion detection.
- Fig 2.
Four-echo t-PEPSI images (TR/TE1/TE2/TE3/TE4/NEX = 5000/23/64/105/145/1, flip angle = 90°).
A, On the first-echo image, susceptibility effects of the lesion have not affected the image contrast to a great extent.
B, Best lesion-to-tissue contrast is obtained around 50 msec.
C and D, At longer TEs, contrast is lost.
- Fig 3.
Location of DAI lesions in deep intra-axial structures.
A and B, GRE (A) and t-PEPSI (B) images show lesions in the corpus callosum, posterior left internal capsule, and right thalamus.
C and D, GRE (C) and t-PEPSI (B) images show a right thalamic lesion.
- Fig 4.
Location of DAI lesions in the deep intra-axial structures.
A and B, Lesions in the periventricular white matter and corpus callosum on GRE (A) and t-PEPSI (B) images.
C and D, GRE image (C) shows slightly abnormal decrease in SI in the left mesial temporal region and in the left posterior lateral of the midbrain. Both lesions are more easily identified on the t-PEPSI image (D).
Tables
Patient/Sex/Age (y) Coma Duration (d) Interval, TBI to MR Imaging (mo) Glasgow Outcome Scale Score 1/M/23 30 3 5 2/M/20 18 8 4 3/M/18 25 6 4 4/F/21 7 3 5 5/F/37 18 26 5 6/M/25 30 4 5 7/M/26 21 30 4 8/M/30 10 73 5 9/M/20 26 13 3 10/M/31 30 18 4 11/M/26 27 4 4 12/M/20 5 29 4 13/M/28 15 9 4 14/M/22 15 3 5 15/M/38 15 3 4 16/M/31 30 112 4 17/M/18 21 25 3 18/M/35 40 16 3 19/M/30 15 6 4 20/M/40 80 154 4 21/M/24 20 17 3 Location of Lesion Lesions Detected GRE Imaging t-PEPSI Only on GRE Imaging Only on t-PEPSI Whole brain (n = 371) 291 230 141 80 Frontal lobe (n = 158) 126 98 60 32 Temporal lobe (n = 88) 74* 37* 51 14 Parietal lobe (n = 30) 22 20 10 8 Occipital lobe (n = 9) 7 8 1 2 Basal ganglia (n = 28) 23 20 8 5 Corpus callosum (n = 22) 12 18 4 10 Periventricular (n = 13) 10 12 1 3 Infratentorial (n = 23) 17 17 6 6 * P <.004, Wilcoxon test.
Small Lesions* GRE Sequence t-PEPSI Sequence No. 130 (86.7) 87 (58.0) Mean diameter (mm) 3.46 ± 2.07 4.92 ± 3.12 Mean area (mm2) 12.74 ± 21.73 26.56 ± 39.18 Note.—Data are the number or the mean ± standard deviation. Data in parentheses are percentages.
* Diameter ≤5 mm.
