The US Food and Drug Administration (FDA) is proposing changes to protect patients from radiation overdoses during CT scans.

The move comes after the FDA carried out an investigation into the reports that claimed that patients were accidentally exposed to excessive radiation while undergoing CT brain perfusion scans.

The investigation found that the CT scanners did not malfunction when properly used, but improper usage of the scanners is more likely to have caused the overdoses.

The regulator has sent a letter to Medical Imaging and Technology Alliance, proposing certain CT enhancements to manufacturers that would improve patient safety.

These include providing training on brain-perfusion protocols to all facilities that have base CT equipment, including a console notification to alert the operator regarding the high radiation dose.

Clarification of parameters affecting the dose, instructions on how to adjust the parameters and organising all dose-related information into one section of a user manual are also being considered.