Article Figures & Data
Figures
- FIG 1.
Axial 3D GRE T1-weighted MR images of an infant at postnatal day 6 show the thyroid (A) and pituitary (B). For measurement of the signal intensity, ROIs are placed on the thyroid (black circle, A), sternocleidomastoid muscle (white circle, A), and anterior pituitary (black circle, B). The posterior pituitary is shown (arrow, B).
- FIG 2.
Scatterplots of the thyroid–muscle signal intensity ratio against the corresponding postnatal age at examination (A) and gestational age at examination (B). There is a negative correlation between the thyroid–muscle signal intensity ratio and postnatal age at examination (A). Conversely, there is no distinct relationship between the thyroid–muscle signal intensity ratio and gestational age at examination (B).
- FIG 3.
Five different cases showing the thyroid (arrowheads) and anterior pituitary (arrows) on coronal 3D GRE T1-weighted MR images examined at different postnatal ages: 4 days (A), 21 days (B), 33 days (C), 46 days (D), and 70 days (E). These patients' gestational ages at birth are 41, 34, 31, 31, and 29 weeks, respectively. At 4 days of postnatal age, the thyroid and anterior pituitary show extremely high signal intensity (A), and the signal intensity of those glands decreased proportionally to postnatal age (B–E). The signal intensities of the thyroid glands are similar to those of the anterior pituitary glands regardless of postnatal age, and the thyroid–anterior pituitary signal intensity ratios are almost 1 (A = 0.91, B = 1.04, C = 0.83, D = 0.81, E = 0.92).
Tables
Means of thyroid–muscle, anterior pituitary–muscle, and thyroid–anterior pituitary signal intensity ratios against the corresponding postnatal age at examination grouped according to week
Postnatal Age at Examination Signal Intensity Ratio Thyroid–Muscle Anterior Pituitary–Muscle Thyroid–Anterior Pituitary Day No Mean (SD) Mean (SD) Mean (SD) 0–6 20 2.03 (0.15) 2.01 (0.30) 1.03 (0.16) 7–13 22 1.99 (0.13) 2.00 (0.23) 1.01 (0.12) 14–20 26 1.88 (0.19) 1.78 (0.29) 1.07 (0.13) 21–27 31 1.67 (0.25) 1.65 (0.17) 1.02 (0.14) 28–34 20 1.54 (0.19) 1.50 (0.19) 1.03 (0.11) 35–41 9 1.57 (0.18) 1.60 (0.27) 1.00 (0.17) 42–48 12 1.38 (0.17) 1.43 (0.20) 0.98 (0.11) 49–55 13 1.34 (0.17) 1.36 (0.21) 1.00 (0.14) 56–62 10 1.40 (0.22) 1.36 (0.18) 1.03 (0.12) 63–69 2 1.25 (0.02) 1.26 (0.18) 1.02 (0.17) 70–76 5 1.19 (0.10) 1.16 (0.10) 1.03 (0.10) 77–83 3 1.13 (0.04) 1.06 (0.02) 1.06 (0.06) 84–90 4 1.16 (0.05) 1.12 (0.04) 1.03 (0.06) 91–97 2 1.10 (0.20) 1.13 (0.03) 0.97 (0.15) 98–104 2 1.09 (0.08) 1.14 (0.12) 0.96 (0.03) 105–111 2 1.10 (0.01) 1.14 (0.11) 0.97 (0.10) Total 183
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