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It is well known that head computed tomography (CT) examination is an area affected by beam hardening because the brain parenchyma surrounded by thick bones is an object to be imaged. Therefore, it is essential to use the beam hardening correction process. However, the beam hardening correction processing varies depending on the apparatus. The purpose of this study is to verify the influence on the image by the difference of the beam hardening correction method from the CT value of the phantom and to prove the effect of the beam hardening correction method. We obtained CT value fluctuation amount, CT value correction amount, and CT value correction effect by the beam hardening from the CT value measurement result of phantom imaging. This was compared with 1 st pass method, 2 nd pass method, and Brain forward projected model-based iterative reconstruction solution. From the results, it was confirmed that the intensity and precision of the beam hardening correction process differ depending on the correction method. As a result, in the head CT examination, even if the same subject is imaged, there is a possibility of a difference in CT value due to the beam hardening correction method.

Influence on Head Computed Tomography Image by Difference of Beam Hardening Correction Method