[Intl_DxMedPhys] Thyroid Uptake Tests: discordance between 2 different probes

[Josh M Wilson]

Erin,

We encountered something similar when recently upgrading to a Captus 4000e. Without knowing what Atomlab settings were in place and the capsule workflow, the two parameters I'd double-check are:
ROI Selections high and low peak (both for the clinical protocols and the QC, because if memory serves, out of the box, they're different)
In the Protocol Set-up, in the Dose Administration, check which method is selected and that what the Capintec manual describes is being done is consistent with what the technologists think they're doing.

Best,
Josh M. Wilson, PhD

Radiation Physicist, Clinical Imaging Physics Group
Duke University Health System

Director, Duke Imaging Physics Residency Program
Assistant Professor, Department of Radiology
Duke University School of Medicine
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From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+joshua.wilson=duke.edu at lists.osu.edu> on behalf of Erin Niven via Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list at lists.osu.edu>
Sent: Tuesday, January 28, 2025 11:28 AM
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Subject: [Intl_DxMedPhys] Thyroid Uptake Tests: discordance between 2 different probes

Good afternoon, We are in the process of switching from an Atomlab 960 to a Captus 4000e and noticed a significant difference between uptake measurements. The protocols are the same - just comparing the counts of the pill placed in the thyroid
Good afternoon,

We are in the process of switching from an Atomlab 960 to a Captus 4000e and noticed a significant difference between uptake measurements.  The protocols are the same - just comparing the counts of the pill placed in the thyroid phantom to the counts from the patient's thyroid 24 hours apart.  The Atomlab is yielding much higher uptake measurements compared to the Captus (pills and patients were counted on both probes, one after the other).

I have a suspicion as to why this might be, but can't get around to doing some measurements today or tomorrow.  So I thought I would see if anyone else has run into this problem before, or if you have suggestions for me to test.

Sincerely,
Erin Niven, PhD, CHP, RRPT, MCCPM



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