[Intl_DxMedPhys] DXA Technologist Precision Assessment with Multiple Scanners

[Bill Erwin]

Yue,

IMHO, if the two scanners are identical, then it should not matter on which
scanner each technologist scans 30 patients twice (or 15 patients thrice).
(When I was at MD Anderson the one time it was performed for 5
technologists operating two identical machines, that is how it was done.)
I am interested in others' perspectives about this, though.  A discussion
about this is included in the (to be published in the not too distant
future) AAPM TG Report 367 (Quality Control of Dual-energy X-ray
Absorptiometry (DXA) Systems).

Regards,
Bill

On Mon, Oct 20, 2025 at 10:07 AM Yue Zhang via Intl_dxmedphys_wd_osu_list <
intl_dxmedphys_wd_osu_list at lists.osu.edu> wrote:

> Hi List, I have a question regarding DXA technologist precision assessment
> following the ISCD guidelines (https: //iscd.
> org/official-positions-2023/). For a single facility with multiple DXA
> scanners, does each technologist need to scan 30 patients
> Hi List,
>
> I have a question regarding DXA technologist precision assessment
> following the ISCD guidelines (https://urldefense.com/v3/__https://iscd.org/official-positions-2023/__;!!KGKeukY!0oaF4hH0QMqxJIZHHGARrlB0AVtjg5FS8kFHicOuK-tqbBgc3ARW_BDy9FhQkUVe_Tmkj4Gu6JRkL780z-ACpMlcr_aQ8kTb4p9GhU9p$ 
> <https://urldefense.com/v3/__https://iscd.org/official-positions-2023/__;!!KGKeukY!xqOFH9mtDybtrvePkh2FBoMIvvdW9I0KLdyYUGFTD25JJV_XHBLlRxHQERCLv3Np1k8xyTMNt_62MYnPgJrtOM7l6r5NmSh5kwWVZqbfT8PV$>).
> For a single facility with multiple DXA scanners, does each technologist
> need to scan 30 patients on each scanner to determine precision separately?
>
> In one clinic, we have two GE iDXA scanners located side by side and two
> technologists who both scan patients on both units. When submitting
> precision data, should each technologist perform 30 scans per scanner, or
> can they divide the scans between the two units (for example, 15 on each)
> to reach a total of 30? Alternatively, is it acceptable to randomly
> distribute the scans across both scanners? The ISCD guidelines don’t seem
> to clarify this situation.
>
> If you have a similar setup, I’d appreciate hearing how your site handles
> this.
>
> --
> *Yue*
>
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