[Intl_DxMedPhys] The New CMS Measure: Global Noise Calculation methods and their variability across clinical CT examinations

[Jie Zhang]

Dear all,

Building on our previous post on effective diameter estimation and its
impact on Size-Specific Dose Estimates (SSDE) in thoracic and abdominal CT (
arXiv:2503.06644 <https://urldefense.com/v3/__https://arxiv.org/abs/2503.06644__;!!KGKeukY!36xkVDszpr7uhPy9ISuecFW8kr-RPvAqgxu0Xp4FSA8P3QV6PcpU0USycQx8leTHM2tBiiGewEojFUDFgM8ayRQRGMcAS7tfDlYcmw$ >), we have just posted a
new study on arXiv regarding global noise calculations.

[2504.11578] A Comparative Evaluation of CT Global Noise Calculation
Methods for Clinical Image Quality Assessment
<https://urldefense.com/v3/__https://arxiv.org/abs/2504.11578__;!!KGKeukY!36xkVDszpr7uhPy9ISuecFW8kr-RPvAqgxu0Xp4FSA8P3QV6PcpU0USycQx8leTHM2tBiiGewEojFUDFgM8ayRQRGMcAS7saE1npIQ$ >

This study does not aim to compare global noise calculation methods in
terms of performance. Rather, our goal is to highlight the potential
variability introduced when different GN calculation methods are applied to
CT exams, as outlined in the CMS quality measure.

These findings support concerns raised by the AAPM-commissioned panel
(recently published in *AJR*) and are intended to provide a technical
perspective on the interpretation and implementation of the CMS measure.

Best regards,

Jie

*Jie Zhang, PhD, DABR (D, N), FAAPM*

Professor of Radiology and Biomedical Engineering

Chief, Division of Diagnostic & Nuclear Medical Physics

Program Director, Diagnostic Imaging Physics Residency

Department of Radiology

University of Kentucky College of Medicine

UK HealthCare

800 Rose Street, Room HX-307

Lexington, KY 40536-0293

Phone: (859) 323-2954

Email: jnzh222 at uky.edu
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