Submillisievert chest dual energy computed tomography: a pilot study.

Area of Science:

• Medical Imaging
• Radiology
• Computed Tomography

Background:

• Dual-energy CT (DECT) offers advanced diagnostic capabilities.
• Reducing radiation dose in CT scans is a critical goal in medical imaging.

Purpose of the Study:

• To evaluate the feasibility of achieving diagnostic quality chest DECT at sub-millisievert (sub-mSv) radiation doses.
• To assess image quality and diagnostic information retention at reduced DECT radiation levels.

Main Methods:

• Prospective study of 20 patients undergoing dual-source multi-detector CT (MDCT).
• Acquisition of additional low-dose DECT series after standard-of-care scans.
• Dose reduction achieved by adjusting milliampere-second settings and exposure control.

Main Results:

• Reduced dose DECT scans maintained good to excellent image quality and sharpness.
• Diagnostic findings were well-demarcated on low-dose images.
• Mean effective dose for reduced dose DECT was 0.7 ± 0.1 mSv.

Conclusions:

• Routine chest DECT is achievable at sub-mSv doses without compromising diagnostic information.
• This study demonstrates the first successful application of sub-mSv doses in a patient study using dual-source DECT.
• Contrast-enhanced chest DECT can be performed effectively at low radiation doses (mean CTDIvol 1.3 mGy, DLP 51 mGy.cm).