Table 1.
Cervical lordosis and cerebral blood flow quantifications of participants for pre- and postcervical lordosis adjustment magnetic resonance angiogram
| Participants | Normal ARA C2-C7 (°) | Precervical ARA C2-C7 adjustment (°) | Deviation from ideal ARA C2-C7 (°) | Postcervical ARA C2-C7 adjustment (°) | Difference between from pre to post-ARA C2-C7 (°) | Preadjustment MRA area over threshold (in2) | Postadjustment MRA area over threshold (in2) | Preadjustment MRA total pixel intensity | Postadjustment MRA total pixel intensity | Percentage change in total pixel intensity (%) | Preadjustment MRA threshold |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | −42.0 | 19.0 | 61 | −34.7 | 53.7 | 0.444 | 0.525 | 453,094 | 557,461 | 23.0 | 76 |
| 2 | −42.0 | 6.7 | 48.7 | −42.2 | 48.9 | 0.257 | 0.311 | 190,537 | 240,016 | 26.0 | 60 |
| 3 | −42.0 | 3.7 | 45.7 | −39.8 | 43.5 | 0.104 | 0.273 | 84,668 | 249,567 | 194.8 | 70 |
| 4 | −42.0 | 3.0 | 45 | −44.4 | 47.4 | 0.304 | 0.427 | 300,480 | 444,834 | 48.0 | 79 |
| 5 | −42.0 | −11.8 | 30.2 | −22.1 | 10.3 | 0.190 | 0.256 | 170,810 | 256,071 | 49.9 | 70 |
| 6 | −42.0 | −13.1 | 28.9 | −44.7 | 31.6 | 0.333 | 0.655 | 386,883 | 841,061 | 117.4 | 90 |
| 7 | −42.0 | −20.4 | 21.6 | −33.1 | 13.1 | 0.235 | 0.607 | 176,260 | 574,491 | 225.9 | 65 |
| Mean | −42.0 | −1.8 | 40.2 | −37.3 | 35.5 | 1.721 | 2.815 | 251,819 | 451,929 | 97.9 | 73 |
ARA C2-C7: Absolute rotational angle or cervical lordosis from C2 to C7 vertebrae, MRA: Magnetic resonance angiogram