The physician should benefit, not harm the patient

Area of Science:

• Medical Physics
• Radiology
• Public Health

Background:

• Historical medical radiation exposures posed significant risks (leukemia, lymphoma, multiple myeloma) to radiologists.
• Current medical radiation practices prioritize physician safety, but patient safety requires ongoing vigilance and prophylactic measures.
• Pregnancy, particularly first-trimester radiography, presents a higher fatal cancer risk, necessitating careful dose management.

Discussion:

• Pediatric CT scans carry a significant lifetime radiation risk, underscoring the need for dose reduction strategies.
• Doses up to 3 millisieverts (mSv) of medical radiation may require reduction or prevention if no direct benefit exists.
• Doses approaching 30 mSv should only be administered when beneficial and difficult to reduce, emphasizing justification and informed consent.

Key Insights:

• Certain nuclear medicine procedures (WHO Category III) yield effective dose equivalents of 5-9 mSv.
• A single 10 mSv population dose correlates with a 1:1000 lifetime risk of solid cancer or leukemia (BEIR VI).
• Multiple CT scans for conditions like renal colic can result in cumulative doses ranging from 19.5 to 153.7 mSv.

Outlook:

• Informed written patient consent and "justification" are recommended for nuclear medicine procedures exceeding 5 mSv, particularly those approaching or surpassing 30 mSv annually.
• Continuous evaluation of radiation dose limits and risk-benefit analyses is essential for optimizing patient safety in diagnostic imaging.
• Adherence to the principle of 'minimum activity consistent with clinical information' is paramount for all patients, especially pregnant women and children.