[Intl_DxMedPhys] [EXTERNAL] Question for DXA experts

[Bob Kobistek]

After reading others’ posts who replied off list, I’m leaning in that direction. The low points of the sine wave occur in approximately September, and the peaks in approximately March. This inversely corresponds to the annual outdoor temperature cycle, but why would the outdoor temperature have any effect on a scanner in a temperature-controlled environment? So thanks to everyone who responded. I’m going to talk to the FE and building maintenance and see if we can figure this out.




Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™)
Medical Physicist
RJK Medical Physics, Inc.
440-463-7879

From: High, Maynard <Maynard.High at wmchealth.org>
Sent: Wednesday, February 4, 2026 3:40 PM
To: DxMedPhys List <intl_dxmedphys_wd_osu_list at lists.osu.edu>; Bob Kobistek <bob at rjkmedphys.com>
Subject: Re: [EXTERNAL] [Intl_DxMedPhys] Question for DXA experts

Looks like my ConEd electric bill.  Could it have anything to do with mean voltage cycling thru the seasons?

Maynard High
Medical Physics: Westchester Medical Center - NYMC
914-493-1410
maynard.high at wmchealth.org<mailto:maynard.high at wmchealth.org>
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From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces at lists.osu.edu<mailto:intl_dxmedphys_wd_osu_list-bounces at lists.osu.edu>> on behalf of Bob Kobistek via Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list at lists.osu.edu<mailto:intl_dxmedphys_wd_osu_list at lists.osu.edu>>
Sent: Wednesday, February 4, 2026 3:08 PM
To: DxMedPhys List <intl_dxmedphys_wd_osu_list at lists.osu.edu<mailto:intl_dxmedphys_wd_osu_list at lists.osu.edu>>
Subject: [EXTERNAL] [Intl_DxMedPhys] Question for DXA experts

Check out these daily QC charts. Interesting? Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™) Medical Physicist RJK Medical Physics, Inc. 440-463-7879 ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍

Check out these daily QC charts. Interesting?



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Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™)

Medical Physicist

RJK Medical Physics, Inc.

440-463-7879

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