Table 1.
Color Tone Changes before and after the MRI Examinations.
| Hue | Value | Chroma | L* | a* | b* | ⊿E00 | ||
|---|---|---|---|---|---|---|---|---|
| Titanium dioxide | Before MRI | 1.2 ± 0.9 Y | 6.10 ± 0.25 | 1.30 ± 0.11 | 62.51 ± 2.50 | 0.82 ± 0.40 | 9.41 ± 0.93 | |
| 0.86 | ||||||||
| After MRI | 1.2 ± 0.2 Y | 6.01 ± 0.01 | 1.25 ± 0.02 | 61.57 ± 0.11 | 0.85 ± 0.09 | 8.98 ± 0.05 | ||
| Iron oxide yellow | Before MRI | 9.3 ± 0.0 YR | 5.60 ± 0.01 | 5.51 ± 0.00 | 56.51 ± 0.11 | 12.94 ± 0.01 | 32.90 ± 0.02 | |
| 3.00 | ||||||||
| After MRI | 9.4 ± 0.1 YR | 5.93 ± 0.06 | 5.32 ± 0.04 | 59.77 ± 0.66 | 12.16 ± 0.06 | 31.64 ± 0.37 | ||
| Iron oxide red | Before MRI | 7.7 ± 0.1 R | 3.10 ± 0.01 | 3.51 ± 0.02 | 31.37 ± 0.14 | 16.63 ± 0.11 | 9.51 ± 0.09 | |
| 0.38 | ||||||||
| After MRI | 7.3 ± 0.1 R | 3.13 ± 0.02 | 3.46 ± 0.01 | 31.69 ± 0.18 | 16.49 ± 0.03 | 9.09 ± 0.03 | ||
| Iron oxide black | Before MRI | 3.32 ± 0.10 | 25.22 ± 0.54 | 0.65 ± 0.06 | 0.19 ± 0.14 | |||
| 1.11 | ||||||||
| After MRI | 3.10 ± 0.05 | 26.34 ± 1.11 | 0.31 ± 0.25 | −0.37 ± 0.40 | ||||
| Ultramarine blue #29 | Before MRI | 6.1 ± 0.1 PB | 2.49 ± 0.13 | 1.30 ± 0.09 | 25.96 ± 1.34 | −0.70 ± 0.06 | −5.81 ± 0.37 | |
| 2.63 | ||||||||
| After MRI | 5.7 ± 0.1 PB | 2.64 ± 0.01 | 2.01 ± 0.02 | 27.57 ± 0.12 | −1.08 ± 0.03 | −8.88 ± 0.07 | ||
| Chromium oxide green #7 | Before MRI | 7.0 ± 0.5 GY | 4.14 ± 0.13 | 2.53 ± 0.29 | 42.42 ± 1.43 | −8.46 ± 1.18 | 11.88 ± 0.88 | |
| 1.35 | ||||||||
| After MRI | 7.7 ± 0.2 GY | 4.24 ± 0.03 | 2.74 ± 0.09 | 43.37 ± 0.33 | −9.62 ± 0.37 | 12.14 ± 0.27 | ||
| D&C red #7 | Before MRI | 5.4 ± 0.1 R | 4.18 ± 0.09 | 8.11 ± 0.25 | 42.45 ± 0.97 | 33.32 ± 1.11 | 17.81 ± 0.37 | |
| 0.87 | ||||||||
| After MRI | 5.3 ± 0.3 R | 4.11 ± 0.05 | 8.45 ± 0.08 | 41.75 ± 0.53 | 34.79 ± 0.26 | 18.20 ± 0.59 | ||
| Carbon black | Before MRI | 3.32 ± 0.10 | 34.12 ± 1.00 | 0.38 ± 0.03 | 0.34 ± 0.12 | |||
| 1.91 | ||||||||
| After MRI | 3.10 ± 0.05 | 31.78 ± 0.57 | 0.33 ± 0.04 | 0.67 ± 0.09 | ||||
| Control | Before MRI | 2.4 ± 0.1 YR | 5.87 ± 0.05 | 2.13 ± 0.03 | 60.29 ± 0.48 | 5.59 ± 0.13 | 9.56 ± 0.08 | |
| 0.90 | ||||||||
| After MRI | 3.3 ± 0.6 YR | 5.79 ± 0.09 | 2.03 ± 0.11 | 59.69 ± 0.78 | 5.19 ± 0.44 | 10.14 ± 0.76 |
Each color change is described in Munsell color space (hue, value and Chroma) and L*a*b* color space (L*, a* and b*).
Color tone in each tattooed area was measured 10 times with a spectrophotometer and the average value was presented as mean ± standard deviation. Abbreviations: Y, yellow; YR, yellow-red; R, red; PB, purple-blue; GY, green-yellow (in the Munsell color space);