Isocenter Watch is a free changelog for diagnostic-imaging compliance. When a federal requirement, a state rule, or an accreditation criterion changes, you get a short note here: what changed, who's affected, and the date it takes effect. Every item is cited to its source. No product pitch.

One email when something actually changes — not on a fixed schedule. Unsubscribe from any of them.

On the clock

Breast density reporting is now a federal floor.

What changed — FDA's amendments to the Mammography Quality Standards Act establish a national minimum standard for reporting breast tissue density to patients and referring providers, replacing the prior patchwork of state-only requirements.

Who's affected — Every MQSA-certified mammography facility, and the physicists who support their QC program and reporting language.

Effective — Compliance required as of September 10, 2024.

Source — FDA, 21 CFR Part 900 (final rule, Federal Register, March 10, 2023).

MQSA · 21 CFR 900.12 · in effect

If your facility's lay summaries and provider reports were last revised before that date, this is the one to check first.

Also being tracked

• CMS rulemaking on a diagnostic-CT radiation-dose quality measure
• State radiation-control program updates across agreement states
• Accreditation QC criteria revisions for CT, MR, and mammography

When any of these moves, it shows up here — with the citation.

— The Isocenter team Where imaging operations align.