| Objective: To make a study of the safe angles and safe depths of Jiuwei and Shangwan in different directions using the technology of MRI in order to provide clinicians with a basis of safe acupuncture, and to prevent clinical accidents.Methods: 1.This study randomly selected 20 volunteers, 10 male and 10 female with an average age of 25.20±2.65. 2. Measure and mark their acupoints of Jiuwei and Shangwan. 3. Scan Jiuwei and Shangwan with MRI in sagittal and horizontal planes. 4. Change the photos attained into JPG format and then measure the safe angles and safe depths of the acupoints using eFilm workstation. 5. Statistics disposal with SPSS17.0: according to homogeneity of variance test, homogeneity of variance using t-test, non- homogeneity of variance using similar t-test. 6.Get the safe angles and safe depths of Jiuwei and Shangwan according to Yan Zhenguo's formula of safe depth and Li Yadong's formula of safe angle: safe depth≤average dangerous depth×75﹪, safe angle≤average dangerous angle- 10°.Results:1. There is no difference in the safe depths of Jiuwei between male and female when the point is acupunctured with different angles in sagittal and horizontal planes.2. There is no difference in the smallest dangerous angle of Jiuwei between male and female when the point is acupunctured rightward and leftward in horizontal plane. The right and left smallest dangerous angles are respectively 18.95±1.90°and 19.25±2.29°, the right and left safe angles are 8.95±1.90°and 9.25±2.29°.3. The dangerous and safe depths of Jiuwei are respectively 22.65±3.81mm and 16.99±2.86mm when the point is acupunctured vertically, 30.29±7.13mm and 22.72±5.35mm when acupunctured downward with an angle of 45°, 32.18±3.89mm and 24.61±2.92mm when acupunctured upward with an angle of 45°, 71.29±7.62mm and 53.47±5.72mm when acupunctured downward with an angle of 15°, 34.35±3.48mm and 25.76±2.61mm when acupunctured upward with an angle of 15°, 33.18±5.79mm and 24.89±4.34mm when acupunctured rightward with an angle of 45°, 29.05±5.12mm and 21.79±3.84mm when acupunctured leftward with an angle of 45°, 68.25±3.58mm and 51.19±2.69mm when acupunctured rightward with the smallest dangerous angle and 69.15±3.45mm and 51.86±2.59mm when acupunctured leftward with the smallest dangerous angle.4.There is correlativity between the right or left smallest dangerous angle of Jiuwei and BMI, the regression equation are respectively y=1.1195x-4.3747 and y=1.1135x-3.3477. There is no correlativity between the right or left smallest dangerous angle of Jiuwei and height, weight, the length between the two breasts or the width of the thumb joint.5. The correlativity between the dangerous depths of Jiuwei and height, weight, BMI, the distance between the two breasts and the width of the thumb joint:①There is correlativity between the dangerous depth and weight when the point is acupunctured vertically, the regression equation is y= 0.3990x-0.4491.②There is correlativity between the dangerous depth and weight when the point is acupunctured downward with an angle of 45°, the regression equation is y= 0.7159x- 11.143.③There is correlativity between the dangerous depth and weight when the point is acupunctured downward with an angle of 15°, the regression equation is y= 0.5794x+ 37.758.④There is correlativity between the dangerous depth and BMI when the point is acupunctured vertically, the regression equation is y= 2.3089x- 25.283.⑤There is correlativity between the dangerous depth and BMI when the point is acupunctured downward with an angle of 45°, the regression equation is y=3.8477x-49.58.⑥There is correlativity between the dangerous depth and BMI when the point is acupunctured rightward with an angle of 45°, the regression equation is y= 1.9316x- 6.9209.⑦There is correlativity between the dangerous depth and BMI when the point is acupunctured leftward with an angle of 45°, the regression equation is y= 1.9463x- 11.345.⑧There is correlativity between the dangerous depth and BMI when the point is acupunctured rightward with the smallest dangerous angle, the regression equation is y=3.2496x - 1.8292.⑨there is correlativity between the dangerous depth and BMI when the point is acupunctured leftward with the smallest dangerous angle, the regression equation is y= 2.7682x+9.7567.6. There is no difference in the safe depths of Shangwan between male and female when it is acupunctured with different angles in sagittal and horizontal planes.7. There is no difference in the smallest dangerous angles between male and female when Shangwan is acupunctured downward, rightward and leftward. The smallest dangerous angles are respectively 18.35±1.93°, 21.35±3.41°and 20.53±2.79°, the safe angles are 8.35±1.93°, 11.35±3.41°and 10.53±2.79°.8. The dangerous and safe depths of Shangwan are respectively 23.00±5.50mm and 17.25±4.13mm when the point is acupunctured vertically, 32.18±8.22mm and 24.14±6.17mm when acupunctured downward with an angle of 45°, 30.88±8.17mm and 23.16±6.13mm when acupunctured upward with an angle of 45°, 32.18±6.45mm and 24.13±4.84mm when acupunctured rightward with an angle of 45°, 29.59±6.06mm and 22.19±4.55mm when acupunctured leftward with an angle of 45°, 73.59±9.58mm and 55.19±7.19mm when acupunctured upward with an angle of 15°, 72.94±7.78mm and 54.70±5.84mm when acupunctured downward with the smallest dangerous angle along the front midline, 83.65±4.12mm and 62.74±3.09mm when acupunctured rightward with the smallest dangerous angle and 81.12±4.11mm and 60.84±3.08mm when acupunctured leftward with the smallest dangerous angle.9.There is correlativity between the right or left smallest dangerous angle of Shangwan and BMI, the regression equation are respectively y= 1.5681x- 11.422 and y= 1.1864x- 4.2842. There is no correlativity between the right or left smallest dangerous angle of Shangwan and height, weight, the distance between the two breasts or the width of the thumb joint.10. The correlativity between the dangerous depths of Shangwan and height, weight, BMI, the distance between the two breasts and the width of the thumb joint:①There is correlativity between the dangerous depth and BMI when the point is acupunctured vertically, the regression equation is y= 2.1762x-22.175.②There is correlativity between the dangerous depth and BMI when the point is acupunctured downward with an angle of 45°, the regression equation is y = 3.583x - 42.202.③There is correlativity between the dangerous depth BMI when the point is acupunctured upward with an angle of 45°, the regression equation is y = 2.673x - 24.605.④There is correlativity between the dangerous depth and BMI when the point is acupunctured rightward with an angle of 45°, the regression equation is y=2.9555x- 29.176.⑤There is correlativity between the dangerous depth and BMI when the point is acupunctured leftward with an angle of 45°, the regression equation is y = 2.4475x - 21.219.⑥There is correlativity between the dangerous depth and BMI when the point is acupunctured upward with an angle of 15°, the regression equation is y= 3.7623x- 4.5133.⑦There is correlativity between the dangerous depth and BMI when the point is acupunctured downward with the smallest dangerous angle, the regression equation is y= 3.0563x+9.4952.⑧There is correlativity between the dangerous depth and BMI when the point is acupunctured rightward with the smallest dangerous angle, the regression equation is y= 1.5673x+51.111.⑨There is correlativity between the dangerous depth and BMI when the point is acupunctured leftward with the smallest dangerous angle, the regression equation is y= 1.7849x+44.064.Conclusions:1. There is no difference in the safe depths between male and female when Jiuwei is acupunctured with different angles in sagittal and horizontal planes, suggesting that clinicians don't need to refer to sexual difference when choosing acupuncture depths when Jiuwei is acupunctured with the above-mentioned angles.2. There is correlativity between the smallest dangerous angles of Jiuwei and BMI, but no correlativity between the smallest dangerous angles and height, weight, the distance between the two breasts and the width of the thumb joint when Jiuwei is acupunctured rightward and leftward, suggesting that clinicians should refer to BMI but don't need to refer to height, weight, the distance between the two breasts and the width of the thumb joint when choosing acupuncture angles.3. There is correlativity between the dangerous depth and weight when Jiuwei is acupunctured vertically, downward with angles of 45°and 15°, suggesting that clinicians should refer to weight when choosing acupuncture depths when Jiuwei is acupunctured with the above-mentioned angles. There is correlativity between the dangerous depth and BMI when Jiuwei is acupunctured vertically, downward with an angle of 45°,rightward and leftward with an angle of 45°, rightward and leftward with the smallest dangerous angle, suggesting that clinicians should refer to BMI when choosing acupuncture depths when Jiuwei is acupunctured with the above-mentioned angles.4. There is no difference in the safe depths between male and female when Shangwan is acupunctured with different angles in sagittal and horizontal planes, suggesting that clinicians don't need to refer to sexual difference when choosing acupuncture depths when Jiuwei is acupunctured with the above-mentioned angles.5. There is correlativity between the smallest dangerous angles and BMI, but no correlativity between the smallest dangerous angles and height, weight, the distance between the two breasts and the width of the thumb joint when Shangwan is acupunctured rightward and leftward, suggesting that clinicians should refer to BMI but don't need to refer to height, weight, the distance between the two breasts and the width of the thumb joint when choosing acupuncture angles.6.There is correlativity between the dangerous depth and BMI when Shangwan is acupunctured vertically, downward and upward with an angle of 45°, rightward and leftward with an angle of 45°, upward with an angle of 15°, downward,rightward and leftward with the smallest dangerous angle, suggesting that clinicians should refer to BMI but don't need to refer to height, weight, the distance between the two breasts and the width of the thumb joint when choosing acupuncture depths when Jiuwei is acupunctured with the above-mentioned angles.
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