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Patient dose in multislice CT: why is it increasing and does it matter?
1UCL Hospitals, Mortimer Street, London W1T 3AA, UK.
The British Journal of Radiology
|November 18, 2004
Summary
Multislice spiral/helical CT scans increase patient radiation dose due to technology and increased use. However, CT radiation doses may not be harmful and could potentially be beneficial, challenging current radiation safety hypotheses.
Area of Science:
- Radiology and Medical Imaging
- Radiation Oncology
- Public Health
Background:
- Multislice spiral/helical CT (MSCT) delivers a higher radiation dose than incremental CT.
- Increased CT applications contribute to a growing patient radiation dose burden.
- Patient anxiety regarding CT radiation dose is often linked to the linear no-threshold (LNT) hypothesis.
Purpose of the Study:
- To review the reasons for increased radiation dose in MSCT.
- To discuss the typical radiation dose magnitude from CT scans.
- To examine the LNT hypothesis and the radiation hormesis theory regarding CT radiation exposure.
Main Methods:
- Literature review of factors contributing to CT radiation dose.
- Analysis of technological and geometric factors in MSCT.
- Discussion of radiation dose thresholds and hormesis.
Main Results:
- Technological, geometric, and increased application factors contribute to higher MSCT radiation doses.
- Typical CT radiation dose magnitudes are presented.
- The LNT hypothesis is contrasted with the radiation hormesis theory, suggesting potential benefits below certain thresholds.
Conclusions:
- It is not definitively established that CT radiation doses are harmful.
- The potential for radiation hormesis, where low doses may be beneficial, warrants consideration.
- Further research is needed to resolve uncertainties regarding CT radiation effects.