Understanding Artifact Sources in Head CT Imaging
Head CT images of a patient wearing a cervical collar show artifacts in the lower cerebellum caused by oblique reconstruction from helical scans due to the gantry's inability to tilt. Dental implants contribute to beam hardening streaks seen in the image, particularly evident in a sagittal view extending through the posterior fossa. These artifacts are exacerbated when data are reformatted into oblique images, highlighting the challenges in image interpretation posed by hardware limitations and patient characteristics.
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Physics Case of the Day - Monday Head CT of patient wearing cervical collar imaged at 120kVp using 256 slice scanner with 80 x 0.625mm detector configuration. Because the gantry can t tilt, images were acquired in helical mode and then reconstructed obliquely. What is the source of the artifacts seen in the lower cerebellum? Author: David M. Gauntt, Ph.D. Page 1
Physics Case of the Day - Monday The artifact in the image to the right is a set of beam hardening streaks streaks caused by dental implants. Author: David M. Gauntt, Ph.D. Page 2
Physics Case of the Day - Monday The topogram (below) confirms the presence of significant dental amalgam, and a true axial view (right) through the plane of the amalgam shows significant beam hardening streaking. Page 3
Physics Case of the Day - Monday In a sagittal view, the artifact (yellow arrow) extends from the dental amalgam back through the posterior fossa. Page 4
Physics Case of the Day - Monday When the data are reformatted into oblique images, the artifact appears in small sections of multiple planes. Page 5
