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J Acupunct Res > Volume 32(4); 2015 > Article
Yang, Park, and Lee: Safe Needling Depth of Pungbu(GV16) with MRI-a Retrospective Study
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The purpose of this study is to determine the safe needling depth of Pungbu(GV16) retrospectively by using magnetic resonance imaging (MRI).


We chose 114 Brain or C-spine MRI images from the Sang-Ji hospital picture archiving communication system. We measured the shortest distance from skin to cerebral dura mater passing by posterior edge of the foramen magnum on the sagittal view for the depth of Pungbu. We analyzed the differences between male and female measured values by using a student t-test.


The average depth of male insertion was 49.71±6.32 mm and the shortest depth of insertion was 36.29 _mm. The average depth of female insertion was 39.84±5.25 mm and the shortest depth of insertion was 30.02 _mm. The results showed a significant difference according to gender (p=0.00).


The depth of male insertion is deeper than that of female, and the safe needling depth in the case of males is 36.29–67.35 _mm, while the safe needling depth in the of females is 30.02–52.18 mm.

Fig. 1
Flow Chart of the Brain and C-spine Magnetic Resonance Imaging Selection Process
MRI : magnetic resonance imaging
Fig. 2
Needling Depth Measurement of Pungbu(GV16)
A is oblique line connecting cerebral dura mater to skin below external occipital protuberance passing by occipital bone. B is horizontal line connecting cerebral dura mater to skin passing by posterior edge of the foramen magnum. C is perpendicular line from skin to cerebral dura mater passing by posterior edge of the foramen magnum. We chose C as the safe needling depth of Pungbu because C is the shortest distance from skin to cerebral dura mater between the external occipital protuberance and the atlas.
Table 1
Needling Depth Comparison of Male and Female in Pungbu(GV16)
N(%) Mean±SD(mm) Maximum value(mm) Minimum value(mm) p-value*
Male 51(44.7) 49.71±6.32 67.35 36.29 0.00
Female 63(55.3) 39.84±5.25 52.18 30.02

* p<0.05 by student t-test.



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