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KMID : 1151820200140070975
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Journal of the Korean Society of Radiology
2020 Volume.14 No. 7 p.975 ~ p.980
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A Measurement Method for Cervical Neural Foraminal Stenosis Ratio using 3-dimensional CT
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KIm Yon-Min
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Abstract
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Cervical neural foraminal stenosis is a very common spinal disease that affects a relatively large number of people of all ages. However, since imaging methods that quantitatively provide neural foraminal stenosis are lacking, this study attempts to present quantitative measurement results by reconstructing 3D computed tomography images. Using a 3D reconstruction software, the surrounding bones were removed, including the spinous process, transverse process, and lamina of the cervical spine so that the neural foramen were well observed. Using Image J, a region of interest including the neural foramen area of the 3D image was set, and the number of pixels of the neural foramen area was measured. The neural foramen area was calculated by multiplying the number of measured pixels by the pixel size. In order to measure the widest area of the neural foramen, it was measured between 40-50 degrees in the opposite direction and 15-20 degrees toward the head. The measured cervical neural foramen area showed consistent measurement values. The largest measured area of the right neural foramen C5-6 was 12.21 mm2, and after 2 years, the area was measured to be 9.95 mm2, indicating that 18% stenosis had progressed. Since 3D reconstruction using axial CT scan images, no additional radiation exposure is required, and the area of stenosis can be objectively presented. In addition, it is good to explain to patients with neural stenosis while viewing 3D images, and it is considered a good method to be used in the evaluation of the progression of stenosis and post-operative evaluation.
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KEYWORD
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3D computed tomography, Cervical neural foraminal stenosis, cervical computed tomography, uncovertebral joint hypertrophy
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