[Intl_DxMedPhys] [External] Re: CT artifact

[Tang, Xiangyang]

Hi Stephanie,

In addition to Baojun's comments, another possibility for the root cause for the artifacts can be the data inconsistency that is induced by the cone angle during data acquisition, which may exist in either helical or axial scan.

Best regards,

Xiangyang

Xiangyang Tang, PhD, DABR, FSPIE, FAAPM & FAIMBE
Professor of Radiology and Imaging Sciences
PI, Translational Research in CT Lab
Director, Medical Physics Imaging Residency Program
Department of Radiology and Imaging Sciences
Emory University School of Medicine

The book entitled "Spectral Multi-Detector CT (sMDCT): Data Acquisition, Image Formation, Quality Assessment and Contrast Enhancement<https://urldefense.com/v3/__https://www.amazon.com/Spectral-Multi-Detector-Computed-Tomography-sMDCT/dp/0367137534?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=ATVPDKIKX0DER__;!!KGKeukY!0OUypJHAAFg21kS7W3auLfH133sr72DMejboDtUYaxJXzaMB0DG8MxB799_4PdMGaaVlHi4SKKTXpW5M0nBDjacrHLFStAE_Z8b1uT7BM84iY1Jeyg$ >"

Mail address:
Woodruff Memorial Research Building Rm 1215
101 Woodruff Circle
Atlanta, GA 30322

email: xiangyang.tang at emory.edu


________________________________
From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+xiangyang.tang=emory.edu at lists.osu.edu> on behalf of Li, Baojun via Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list at lists.osu.edu>
Sent: Wednesday, July 15, 2026 2:40 PM
To: Stephanie M. Leon <Stephanie.M.Leon at hitchcock.org>; intl_dxmedphys_wd_osu_list at lists.osu.edu <intl_dxmedphys_wd_osu_list at lists.osu.edu>
Subject: [External] Re: [Intl_DxMedPhys] CT artifact

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

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

[cid:image001.png at 01DD1453.51CBE160]<https://urldefense.com/v3/__https:/www.dartmouth-health.org/__;!!KGKeukY!2BMW4djsl7LXDAsQP936Qdzwr_YKg1h0l_kriJsSkyF7oufIrZiymtwpUxcw_3OatOTY0fNJNQSZ3B2_wV_rIGFyKD6iM202yv9vYKvmJbu4NciqPtp8Yg$>






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