[Intl_DxMedPhys] PET artifact

[Paul Kinahan]

Hello Nima

Do you mean a Siemens Biograph PET/MR?
Is the second image without attenuation correction?
It is unlikely to be scatter-related.
Generally trying to figure these out you need the attenuation image

Regards,
Paul
--
Paul Kinahan, PhD, FIEEE, FAAPM, FSNMMI, FAIMBE
Professor of Radiology and Bioengineering
Vice Chair for Radiology Research
Adjunct Professor Radiation Oncology
Head, Imaging Research Laboratory
Director, UW Medical Center  PET/CT Physics
University of Washington

On Apr 15, 2025, at 11:52 AM, Nima Kasraie via Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list at lists.osu.edu> wrote:

Hello group

Here is a PET WB Corrected recon from a Siemens Biograph 3R:

<image001.png>

No FDG signal shows up on the ITER TOF recon at same place. A void just suddenly shows up in the abdomen not unsimilar to MRI Susceptibility artifacts we used to see as students:

<image002.png>

Is this a case of mis-registration, or am I looking at Scatter as the culprit?


P.S. The raw data got erased off the scanner. So I cant do any new recons. But I’d like to know if my suspicion is correct.






Nima Kasraie, PhD, MSc, DABR (D), DABSNM (I)
Associate Professor of Radiology
Medical Physics Division

Department of Radiology
5323 Harry Hines Blvd., Dallas, Texas 75390-9071
Phone: 214-648-7978
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<image003.png>


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