[Intl_DxMedPhys] CT artifact

[Li, Baojun]

Hi Stephanie,

The cerebellum is near the temporal bone and the skull base, so it tends to be affected by beam hardening. The BH effect makes the pixels brighter. I also observed some radial banding patterns, which may be the result of helical interpolation or sagittal reformatting.

Baojun


From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces at lists.osu.edu> On Behalf Of Stephanie M. Leon via Intl_dxmedphys_wd_osu_list
Sent: Wednesday, July 15, 2026 12:21 PM
To: intl_dxmedphys_wd_osu_list at lists.osu.edu
Subject: [Intl_DxMedPhys] CT artifact

Hi all, I have an odd CT artifact that a radiologist brought to my attention. The top image has bright gyri on the right cerebrum. The 2nd image shows the gyri okay in the left cerebrum, but very bright in the cerebellum. The cerebellum is also
Hi all,

I have an odd CT artifact that a radiologist brought to my attention. The top image has bright gyri on the right cerebrum.  The 2nd image shows the gyri okay in the left cerebrum, but very bright in the cerebellum.  The cerebellum is also very bright in the 3rd image.

This is from a Canon Aquilion Prime SP, helical acquisition, AIDR 3D recon and FC26 kernel. It is apparent in the axial images too, just a bit harder to see. The patient received an MRI to follow up, which was normal.

Any ideas??


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Stephanie M. Leon, PhD, DABR, DABSNM
Chief of Diagnostic Medical Physics
Associate Professor of Radiology
Tel (603) 650-3796
Dartmouth-Health.org
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